Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2003GL019377

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1029/2001JD0001225

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2001JD001386

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Publisher：Copernicus GmbH  

Abstract. This article gives the overview of the Japan Aerospace Exploration Agency (JAXA) level 2 (L2) Standard and Research algorithms and products by Japanese science teams for EarthCARE Clouds, Aerosols and Radiation Explorer (EarthCARE), which is a JAXA and the European Space Agency (ESA) joint satellite mission. First three single sensor algorithms for 94GHz cloud profiling radar (CPR)-only, 355nm-atmospheric lidar with high spectral resolution function (ATLID)-only, and multi-spectral imager (MSI)-only retrievals, and their products were briefly reviewed. CPR-echo algorithms provide radar reflectivity factor, Doppler velocity, normalized radar cross section and path integral attenuation. CPR-only, CPR-ATLID synergy and CPR-ALTID-MSI synergy algorithms for standard cloud products provide cloud detection, cloud particle type and cloud microphysics, and the research products further provide Doppler velocity, terminal velocity and vertical air motion inside clouds. ATLID standalone algorithms produce aerosol, cloud and clear sky classification products as well as total aerosol extinction and extinction and number concentration of each aerosol types. ATLID-MSI synergy algorithms are developed to retrieve effective radius for each aerosol species in addition to the ATLID-only products. MSI algorithms retrieve cloud effective radius, ice and water content and cloud top pressure. Four sensor algorithms are prepared to produce shortwave and longwave radiative fluxes at the top of atmosphere, those at the surface and also heating rate profiles by using the outputs from CPR, ATLID and their synergy algorithms. The shortwave and longwave fluxes from the four sensor algorithms will then be compared with broad band radiation (BBR) to examine the consistency of the JAXA L2 retrievals. The algorithms are developed and evaluated by using observational data from satellites and ground-based instruments, and simulation data from the Japanese global cloud-resolving model, the Nonhydrostatic Icosahedral Atmospheric Model (NICAM) with Joint simulator. As for space-borne data, existing space-borne satellites data such as CloudSat, CALIPSO, MODIS and CERES datasets are intensively used. For ground-based observations, High-sensitivity Ground-based Super Polarimetric Ice-crystal Detection and Explication Radar (HG-SPIDER) with a minimum sensitivity of -40 dBZ at 15 km and over -60 dBZ at 1 km, Electronic Scanning SPIDER (ES-SPIDER), 355 nm high spectral resolution lidar, multiple-field-of-view multiple scattering lidar and Doppler lidars are installed at EarthCARE super-site in Koganei, Tokyo and offers unique opportunities to evaluate and analyse EarthCARE data.

DOI： 10.5194/amt-2024-101

researchmap

DOI： 10.5194/amt-17-3081-2024

Web of Science

Publishing type：Part of collection (book)   Publisher：Springer Nature Switzerland  

Global wind measurements are essential for numerical weather prediction (NWP), climate studies, and various meteorological studies. Current space-based passive sensors and micro sensors have large coverage and high temporal resolution but low vertical resolution. The Doppler Wind Llidar (DWL) is a useful technique for wind measurement. JAXA studies the feasibility of a future space-based coherent DWL (CDWL) for global wind profile observation. The mission concept of the space-based CDWL is designed to have one look for line-of-sight (LOS) wind measurement at an off-nadir angle of 35° at an azimuth angle of 90° (270°) along satellite track. The candidate altitude and orbit of the satellite are 300 km and dawn-dusk sun-synchronous polar orbit. The forecast impacts of both 1.5- and 2-µm space-based DWL were evaluated using the operational global data assimilation system. The data assimilation experiments were conducted in August in 2018 to assess overall impact and seasonal dependence. It is found that the two space-based DWL have positive impact on NWP. Relative forecast error reduction for 1.5- and 2-µm space-based DWLs can be expected to about 3 and 2%, respectively. Compared to the 2-µm DWL experiment, 1.5-µm DWL experiment had a feature that the number of data usage is larger in the lower layer and less in the upper layer. The future space-based CDWL will fill the gap of the current global wind observing systems and contribute to the improvement of the initial conditions for NWP, atmospheric dynamics and phenomena, and various meteorological researches.

DOI： 10.1007/978-3-031-53618-2_4

Web of Science

Scopus

researchmap

Publisher：2024 4th URSI Atlantic Radio Science Meeting, AT-RASC 2024  

A methodology for estimating reflectivity and Doppler velocity at 94 GHz from K-band Doppler spectra collected by MRR and coincident disdrometer observations has been developed and tested in Antarctica using CloudSat overpass. This methodology, called K2W, is now evaluated in Artic, at the Ny Ålesund AWIPEV French-German research base using a co-located W-band. The three cases of snow precipitation analyzed highlight a fairly good performance of K2W.

DOI： 10.46620/URSIATRASC24/MQUO4417

Scopus

Web of Science

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Proceedings of SPIE - The International Society for Optical Engineering  

The paper presents the elements of the light scattering matrix for atmospheric ice aggregated particles, consisting of "bullets" with the number of particles from 1 to 6. The calculation of the scattering matrices was carried out within the geometric optics approximation and single scattering. The spatial orientation of aggregates is random, the refractive index is 1.3116 (for a wavelength of 0.532 µm). The dependence of the light scattering matrix elements on the number of particles in aggregates is presented. The results can be used for interpretation of the data retrieved from laser sensing of crystalline clouds from ground and space.

DOI： 10.1117/12.2690931

Scopus

Other Link： https://doi.org/10.1117/12.2690931

Publisher：Geophysical Research Letters  

A more accurate representation of ice-phase processes in numerical models necessitates an enhanced understanding of ice-particle microphysics and their respective formation conditions. Prior in situ measurements have noted distinctive ice-particle shape characteristics associated with different cloud systems and geographical locations. The recent advancement in ice-particle backscattering theories enables a more comprehensive exploration of the geographical distribution and seasonal dependence of ice-particle shape categories than ever before. This exploration is being undertaken for the first time using space-borne lidar measurements. Distinct geographical preferences were observed for five different ice-particle categories. Bullets/rosettes were the most common, followed by Voronois, which were especially prevalent in high-level tropical clouds, and 2D columns, which were commonly found in mid- and low-level clouds. Droxtals were primarily observed in high-level subtropical regions. The global distribution of ice-particle types provides valuable insights into the physical processes related to ice cloud particle shape formation, cloud duration, and radiative impacts.

DOI： 10.1029/2023GL105522

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1029/2023GL10552

Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Remote Sensing of Environment  

Ground-based snowfall observations over Antarctica are rare due to the harsh environment and high logistical, equipment maintenance, and operational costs. Satellite measurements are crucial to provide continent-wide precipitation estimates, and this highlights the importance of validating the satellite estimates with measurements collected by ground-based Antarctic stations. The NASA CloudSat satellite, launched in 2006, is equipped with a 94 GHz (W-band) Cloud Profiling Radar (CPR) that provides measurements of reflectivity profiles of clouds and precipitation, whereas the incoming ESA/JAXA EarthCARE mission will add Doppler capability to a 94 GHz radar. This study explores how the synergy between two instruments available at most Antarctic stations, i.e., Micro Rain Radar (24 GHz, K-band) and laser disdrometer, can be used to validate satellite-borne W-band radar measurements, including Doppler estimates. A new validation methodology (K2W) was proposed to combine these instruments for simulating the 94 GHz reflectivity and Doppler measurements from Micro Rain Radar spectra. Assessment of the proposed K2W conversion methodology showed that the CloudSat Ze profiles can be simulated by the method with 0.2 dB mean difference at the lowest satellite radar range bin when time lag within ±12.5 min and the distance within 25 km around the CloudSat overpass were considered. With the K2W method, the 94 GHz Doppler velocity below 1 km altitude that would be observed by EarthCARE was obtained, and the standard deviation of the simulated Doppler velocity was found to be smaller than about 0.2 m s−1. The simulated 94 GHz Doppler radar profile information, which is less affected by attenuation compared to ground-based 94 GHz radar, will significantly improve the quantification of precipitation over Antarctica. This methodology will be applied to further assess the EarthCARE CPR Doppler velocity measurement accuracy as well as the Level 2 standard products for precipitation in Antarctica and at many other ground observation sites.

DOI： 10.1016/j.rse.2023.113630

Web of Science

Scopus

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

Other Link： https://doi.org/10.1016/j.rse.2023.113630

Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Atmospheric and Oceanic Optics  

The article “Backscattering Characteristics of Optical and Electromagnetic Waves in Joint Sensing of Cirrus Clouds by a Polarizing Lidar (0.355 μm) and a 94-GHz Radar”, written by V. A. Shishko, D. N. Timofeev, A. V. Konoshonkin, N. V. Kustova, N. Kan, I. V. Tkachev, K. Masuda, H. Ishimoto, H. Okamoto, and A. G. Borovoi, was originally published electronically in Springer-Link on December 15, 2022 without Open Access. After publication in volume 35, issue 6, pages 775–781, the authors decided to make the article an Open Access publication. Therefore, the copyright of the article has been changed to © The Author(s) 2022 and the article is forthwith distributed under the terms of a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/ by/4.0/, CC BY), which permits use, duplication, adaptation, distribution and reproduction of a work in any medium or format, as long as you cite the original author(s) and publication source, provide a link to the Creative Commons license, and indicate if changes were made.

DOI： 10.1134/S1024856023330023

Web of Science

Scopus

researchmap

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Atmospheric and Oceanic Optics  

Abstract: In this work, the problem of radiation scattering by ice crystals typical for cirrus clouds is solved for a 94-GHz radar (wavelength 3189 µm) and a lidar (wavelength 0.355 µm); the ice refractive indices are 1.7864 + 0.0032i and 1.3249 + 0i, respectively. The scattering matrices are calculated within the physical optics approximation and the discrete dipole approximation for the case of randomly oriented particles with sizes from 4 to 1000 µm. The ratio of the radar and lidar backscattering signals in the backward direction (the so-called radar–lidar ratio) is calculated for a wide range of the particle size for typical shapes of cirrus cloud ice crystals. It is shown that this ratio can be used for estimating the size of ice crystals in cirrus clouds.

DOI： 10.1134/S1024856022060239

Web of Science

Scopus

researchmap

Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

Abstract

We describe a collaborative analysis study involving numerical models and observation data for the Tokyo metropolitan area called the ULTra-sIte for Measuring Atmosphere of Tokyo Metropolitan Environment (ULTIMATE) project. It evaluates cloud microphysics schemes of numerical models using extensive observation data for the Tokyo area. We have access to various remote sensing and in situ data for the Tokyo area for operational and research purposes, particularly by enhancing observations for ground validation of the EarthCARE satellite, which is set to launch in 2023. This study focuses on using the dual-polarization Doppler weather radar, operated by the Japan Meteorological Agency. In terms of numerical models, we use and compare multi-models with single-moment (SM) and double-moment (DM) cloud microphysics schemes; the global non-hydrostatic model, Non-hydrostatic ICosahedral Atmospheric Model (NICAM) and the two regional models with A System based on a Unified Concept for Atmosphere (ASUCA) and Scalable Computing for Advanced Library and Environment (SCALE) are used. In particular, because NICAM can be used as both a global and a regional model, we can immediately test the improved scheme on a global scale for its effect on climatology and the evaluation of climate sensitivity. This paper introduces the methodology for evaluating numerical models by the dual-polarization radar using the observation simulator and compares numerical model results with observations. In particular, we evaluate the simulated rain in the lower level near the ground and the large ice particles just above the melting level. The simulation with NICAM-DM reproduces the comparable polarimetric radar characteristics of rain as the observation. However, the simulations with NICAM-SM and ASUCA-SM show larger raindrop sizes in stronger rain areas compared to the observation. For the larger ice particles just above the melting level around 4 km, NICAM-DM and ASUCA-SM overestimate particle sizes of graupel or snow, while NICAM-SM has a similar size of the ice particles. In future studies, we will use the present results to improve the cloud microphysics scheme, which will be tested on a global model.

DOI： 10.1186/s40645-022-00511-5

Web of Science

Scopus

researchmap

Other Link： https://link.springer.com/article/10.1186/s40645-022-00511-5/fulltext.html

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1186/s40645-022-00511-5

Other Link： https://doi.org/10.1186/s40645-022-00511-5

Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

A compact and simple 355-nm direct-detection Doppler wind lidar (DDDWL) was developed to measure the line-of-sight (LOS) wind speed of the background atmosphere from atmospheric molecule return signals with and without aerosols and clouds. A receiver design with a Fabry–Perot etalon interferometer (FPEI) without an inside deposited step coating or fiber coupling is considered for the DDDWL using the double-edge technique. The receiver with the double-edge technique uses a FPEI and wedge prism to form a double-edge filter. The development of the double-edge filter in this combination is, to the best of our knowledge, an improvement at 355-nm wavelength. Considerations for the DDDWL receiver with a FPEI revealed that a full-angle light beam divergence into the FPEI and a working FPEI aperture are significant factors for the receiver design. Preliminary experimental evaluation demonstrated that the DDDWL had the potential of LOS wind speed measurements with a random error of less than 1 m/s when the signal-to-noise ratio was approximately 300. The DDDWL-measured vertical LOS wind speed profile was consistent with that of a 2-µm coherent Doppler wind lidar within the measurement error range. The preliminary experimental LOS wind measurement results demonstrated the capability of the DDDWL to measure low LOS wind speeds.

DOI： 10.1364/AO.460219

Web of Science

Scopus

PubMed

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1364/AO.460219

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

Simple dual-wavelength high-spectral-resolution lidar at 355 and 532 nm with a scanning interferometer was developed for continuous observations of aerosol profiles. Scanning the interferometer periodically over a range of one fringe at 532 nm (1.5 fringes at 355 nm) enabled recording of range-resolved interference signals at these two wavelengths. Reference signals taken from the transmitted laser were used to correct the interference phase shift due to laser frequency variation for every scan. Profiles of aerosol backscatter and extinction coefficients were retrieved from range-resolved interference data. One month of continuous measurements demonstrated the robustness of the system.

DOI： 10.1364/AO.451707

Web of Science

Scopus

PubMed

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.jqsrt.2021.107710

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi. org/10.1029/2020JD033562

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.polar.2020.100621

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

衛星搭載ライダCALIPSOは、可視と近赤外の2波長で後方散乱係数と可視波長では偏光解消度の情報を得ることができるが、近赤外の波長の情報はこれまで雲研究には利用されてこなかった。これは一つには、氷粒子のライダ後方散乱の理論的計算が非常に限られた形状であったことによる。ここでは現実に近い状況を計算可能な散乱理論を構築し、衛星解析で利用可能な参照テーブルを作成した。この結果、後方散乱の波長比と偏光解消度の情報を組み合わせることで、氷粒子形状や配向の情報を抽出可能であることを初めて示すことに成功した。EarthCARE衛星に搭載される予定の高スペクトル分解ライダでは、ライダー比と偏光解消度の組み合わせから、同様の情報が取得可能であることを示した。これらの結果を衛星解析の実際に適用し、氷粒子の抽出を行い、形状や配向を特定することで、微物理特性抽出に大きな影響があることが判明した。

DOI： https://doi.org/10.1364/OE.400510

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1175/JAS-D-19-0273.1

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1029/2020GL088030

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1051/epjconf/202023707011

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1051/epjconf/202023702023

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1051/epjconf/202023706006

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1051/epjconf/202023707009

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1175/JAS-D-20-0078.1

Other Link： https://doi.org/10.1175/JAS-D-20-0078.1

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1364/OE.390987

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1007/978-3-030-38696-2_1

Language：English   Publishing type：Research paper (scientific journal)  

気候変動予測における不確定性にしめる上層に存在する氷雲など雲の影響は大きい。不確定性を減少させるためには、衛星観測から形、サイズ、量など氷粒子の情報を正確に抽出する必要がある。
日欧共同衛星EarthCAREでは、次世代型のライダとして、高スペクトル分解ライダが搭載される予定である。今回、大規模な物理光学の理論計算によって、様々な形状や配向をとりえる氷粒子のライダ後方散乱特性を非常に広範な範囲で解析した。その結果、高スペクトル分解ライダで仮定なしに取得可能な消散係数と後方散乱係数の比で定義されるライダ比と偏光解消度の2次元ダイアグラムを利用すること、衛星ライダから、氷粒子形状や配向状態を抽出できる事を初めて示すことに成功した。

DOI： doi.org/10.1364/OE.27.036587

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2019JD030519

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.polar.2019.05.003

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1364/AO.58.006274

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2151/jmsj.2019-033

Language：English   Publishing type：Research paper (scientific journal)  

衛星搭載偏光ライダの多重散乱偏光過程を高速に解析する手法の確立

DOI： 10.1364/OE.27.00A117

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1117/12.2324388

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： DOI: https://doi.org/10.1051/epjconf/201817602014

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： https://doi.org/10.1051/epjconf/201817602014

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： DOI: https://doi.org/10.1051/epjconf/201817608004

Language：English   Publishing type：Research paper (scientific journal)  

DOI： DOI: 10.1002/asl.807

Language：English   Publishing type：Research paper (scientific journal)  

Development of a physical model for accurate and fast estimates of the time-space dependent multiple-scattered backscattered return.

DOI： doi.org/10.1364/OE.26.00A301

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1007/978-3-319-72583-3_8

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi: 10.1117/12.2286579

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1002/2017JD027113

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.11440/rssj.37.434

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi: http://dx.doi.org/10.1016/j.jqsrt.2016.12.024

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi: 10.1063/1.4975529

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi: 10.1063/1.4975514

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi: http://dx.doi.org/10.1063/1.4975527

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi: 10.1063/1.4975526

Language：English   Publishing type：Research paper (scientific journal)  

既存の地上ライダと異なり、複数の視野角をもつことで衛星と同等のフットプリントで偏光を含めたライダ観測機器を作成し、その初期観測を行った。雲レーダによって雲頂高度の検証も実施した。

DOI： https://doi.org/10.1364/OE.24.030053

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1002/2016JD025441

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi:10.1117/12.2249115

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi:10.1117/12.2248409

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1002/2016JD024775

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： DOI: 10.1051/epjconf/201611911007

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： DOI: 10.1051/epjconf/201611916007 ILRC 27

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： DOI: 10.1051/epjconf/201611921005

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1002/2015JD024334

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.2151/sola.2016-021

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： DOI: 10.1051/epjconf/201611916001

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2151/jmsj.2015-045

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi: 10.1117/12.2204879

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi: 10.1117/12.2203288

Language：English   Publishing type：Research paper (scientific journal)  

DOI： in press

Language：English   Publishing type：Research paper (scientific journal)  

DOI： -368

Language：English   Publishing type：Research paper (scientific journal)  

DOI： http://dx.doi.org/10.1175/BAMS-D-12-00227.1

Language：English   Publishing type：Research paper (scientific journal)  

DOI： DOI: 10.1002/2015GL064282

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi: 10.1002/2013RS005369

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi: http://dx.doi.org/10.1175/JTECH-D-13-00245.1

Other Link： http://journals.ametsoc.org/doi/abs/10.1175/JTECH-D-13-00245.1

Language：English   Publishing type：Research paper (scientific journal)  

DOI： DOI:10.2151/jmsj.2014-502

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： DOI: 10.1002/2014JD021706

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1175/JAMC-D-13-0215.1

Language：English   Publishing type：Research paper (scientific journal)  

衛星搭載レーダとライダの複合解析より、従来はライダで検出される雲頂は、レーダのものより高いとされてきたが、レーダの方が高い雲頂を与える場合が、下層雲を中心としてかなり多いことがわかった。
これは雲頂に、少数の大きい粒子が存在するためであると推測される。

DOI： DOI: 10.1002/2013JD020919

Language：Japanese   Publishing type：Research paper (scientific journal)  

Study of clouds by spaceborne active sensors: Current status and future direction

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

We describe a method to evaluate cloud microphysics simulated with a global cloud-resolving model against CloudSat and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) satellite data.

DOI： doi:10.1002/jgrd.50564

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi:http://dx.doi.org/10.1063/1.4804809

Other Link： http://proceedings.aip.org/resource/2/apcpcs/1531/1/472_1

Language：English   Publishing type：Research paper (international conference proceedings)  

We discuss about recent progresses in analyses of retrieved cloud properties by active sensors. We have developed several types of algorithms that can be applied to data obtained by cloud profiling radar (CPR) and lidar to retrieve cloud macroscale and microphysical properties. The retrieved properties include cloud occurrence, cloud particle phase, orientation and microphysics. Combined use of CPR and lidar has been recognized to be a powerful tool for the retrieval of cloud microphysics. Single scattering property of ice particles is one of the key elements in the analyses. It has been necessary to develop appropriate scattering theories and inversion methods that can take into account the particle shape and its orientation for the analyses of CPR and lidar data. We have been analyzing the data obtained by the ground based, ship-borne and space-borne active sensors. Space borne active sensors CloudSat and CALIPSO successfully started global observations of cloud and aerosols in June 2006. The theoretical basis of the analysis of these active sensors is given. And global analysis of cloud macro-scale and microphysical properties has been performed. After these space missions, JAXA and ESA are planning a new space mission, EarthCARE and it will carry four sensors including 95 GHz Doppler radar and high spectral resolution lidar. It will be launched in 2015 and is expected to provide information of cloud microphysics as well as vertical air motion. The retrieval algorithms for EarthCARE have been developed by using the existing radar and lidar data including CloudSat and CALIPSO.

DOI： doi:http://dx.doi.org/10.1063/1.4804697

Other Link： http://proceedings.aip.org/resource/2/apcpcs/1531/1/19_1

Language：English   Publishing type：Research paper (international conference proceedings)  

We develop algorithms that can be applied to EarthCARE Cloud Profiling Radar (CPR) and Atmospheric backscatter LIdar (ATLID) and discuss about the expected products. EarthCARE will carry CPR and ATLID and these combination corresponds to the CloudSat and CALIPSO for the A-train. Due to the similarities between the EarthCARE and the A-train, it will be possible to apply the similar types of algorithms that have been already developed and extensively used for the analyses of the A-train satellites and it is therefore expected to obtain the similar cloud products for the EarthCARE. On the other hand, there are some differences between the EarthCARE and A-train satellites, e.g., the EarthCRAE CPR has better sensitivity compared with the CloudSat. And Doppler capability of the EarthCARE-CPR is a new element and is expected to provide the better constraint for the retrievals of cloud/precipitation microphysics. And the vertical air motion and sedimentation velocity of cloud particles will be inferred.

DOI： http://dx.doi.org/10.1063/1.4804803

Language：English   Publishing type：Research paper (international conference proceedings)  

We compiled the seasonal variations of the vertical distribution of clouds through a combined analysis of multiyear CloudSat cloud radar and the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) lidar observations between June 2006 and May 2010. The differences between using the previous (version 2, V2) and the latest release (version 3, V3) CALIPSO “Vertical Feature Mask (VFM)” results were also examined. We first developed a cloud mask scheme for CALIPSO and then developed a combined CloudSat/CALIPSO cloud mask based on the ground observations. The VFM (V2) misclassified aerosols and noise signals located in attenuated areas as cloud. Cloud edge detection was also slightly greater by the VFM (V2). In addition, by updating from CALIPSO V2 to V3, the cloud fractions by the VFM dramatically decreased below ~2.5 km while there is little change in those by the C2. The cloud fraction still differed by as much as 20% between the VFM and our CALIPSO scheme. These results indicate that the issues of CALIPSO VFM (V2) had not been corrected in the latent release VFM (V3) completely. The 4-year averaged seasonal variations were examined by using our combined CloudSat/CALIPSO scheme. In the low-level, cloud coverage is relatively smaller over land and in the InterTropical Convergence Zone (ITCZ) depending on season due to a high frequency of cloud overlap. Very large coverage (~92%) is shown over the western coasts of continents, especially during the summer and fall. The seasonal variation of the ITCZ and the subtropical high in the high-level are observed. A remarkably large cloud coverage of ~87% exists over the whole area with seasonal variation except for part of the subtropical high region, Greenland and Antarctica.

DOI： doi:http://dx.doi.org/10.1063/1.4804805

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi:http://dx.doi.org/10.1063/1.4804741

Other Link： http://proceedings.aip.org/resource/2/apcpcs/1531/1/200_1

Language：English   Publishing type：Research paper (scientific journal)  

A general view of the backscattering Mueller matrix for the quasi-horizontally oriented hexagonal ice crystals of cirrus clouds has been obtained in the case of tilted and scanning lidars. It is shown that the main properties of this matrix are caused by contributions from two qualitatively different components referred to the specular and corner-reflection terms. The numerical calculation of the matrix is worked out in the physical optics approximation. These matrices calculated for two wavelengths and two tilt angles (initial and present) of CALIPSO lidar are presented as a data bank. The depolarization and color ratios for these data have been obtained and discussed.

Other Link： http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-27-28222

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s00382-011-1178-y

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi: http://dx.doi.org/10.1175/JAS-D-11-0213.1

Language：English   Publishing type：Research paper (scientific journal)  

Synergetic spaceborne observations of overshooting air, defined as cloud intrusion through the level of neutral buoyancy above deep convection, are analyzed using various thresholds introduced in previous studies to detect overshooting. The brightness temperature of the overshooting air measured by the Moderate Resolution Imaging Spectroradiometer (MODIS) is generally 2 K higher than that retrieved by the radiative transfer model in which the size distribution of ice cloud particles is estimated from Cloud-Aerosol Lidar with Orthogonal Polarisation (CALIOP) and CloudSat data and the vertical temperature profile of cloud is assumed to follow that of the European Centre for Medium Range Weather Forecst(ECMWF). The lapse rate of overshooting whose cloud top is higher than the level of the cold-point temperature (CPT) is lower than that of an adiabatic expansion. These observations can be rationalized as being due to the overshooting air being locally warmed by a mixture of warmer stratospheric air. Analysis of CALIOP and CloudSat data by using a radar-lidar algorithm shows that the mode of averaged ice water content of the overshoot above the CPT height is 6.3-10 mg/m3. Therefore, if 5% or more of ice particles in the overshoot are sublimated and mixed into the lower stratosphere, the lower stratospheric air will be hydrated. The difference between the brightness temperatures of 6.7- and 11-μm channels observed with MODIS demonstrates that the overshoot enhances stratospheric water vapor. These results indicate that the warm stratospheric air moves downward at and around the overshoot and mixes with the overshooting air and that the overshooting hydrates the lower stratosphere.

DOI： doi:10.1029/2011JD017402

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1016/j.jqsrt.2010.06.002

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2011JD015885

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2009JD013383

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Others   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2009JD013104

Other Link： http://onlinelibrary.wiley.com/doi/10.1029/2009JD013104/abstract

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1029/2009JD012334

Other Link： http://onlinelibrary.wiley.com/doi/10.1029/2009JD012334/abstract

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2009JD013000

Other Link： http://onlinelibrary.wiley.com/doi/10.1029/2009JD013000/abstract

Language：English   Publishing type：Research paper (international conference proceedings)  

Observing cloud and aerosol distributions and their optical and microphysical properties are one of important activities for the global climate change study, since the role of these particles and their interactive responses to the climate system are still in mystery. The Second generation Global Imager (SGLI) aboard the GCOM-C satellite is a follow-on sensor of the Global Imager (GLI) aboard the Midori-2 satellite. It is designed for globally observing clouds and aerosols targets with high-accuracy and quick recurrence. The major geophysical parameters retrieved from SGLI atmosphere’s algorithm are cloud optical thickness, cloud particle radii, cloud top temperature, cloud geometrical thickness, aerosol optical thickness, and aerosol Angstrom exponents. Cloud discriminations all of SGLI pixels will also be supplied. It is notable that the SGLI has some functions specialized for observing aerosol properties over ocean and land. They are 0.38-μm channels, multi-angles and polarization capability in 0.67 and 0.86-μm channels. This paper introduces strategy of the atmospheric observations by use of the GCOM-C/SGLI and the latest research results obtained from GLI- to-SGLI scientific activities.

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10,1016/j.jqsrt. 2008.12.006,110,

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1029/2008JD011040

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.2151/sola.2008-015

Language：English   Publishing type：Research paper (scientific journal)  

DOI： DOI: 10.1175/2007

Language：English   Publishing type：Research paper (scientific journal)  

DOI： DOI: 10.1109/TGRS.2008.2000797

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1029/2007JD009125

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1029/2006JD007435

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1029/2006JD007435

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1029/2005JD006959

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： doi: 10.1117/12.511026

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1006/icar.2002.6849

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (international conference proceedings)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：Japanese   Book type：General book, introductory book for general audience

Event date： 2015.7

Language：English   Presentation type：Oral presentation (general)  

Venue：New York, USA   Country：United States  

Event date： 2015.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Prague, the Czech Republic   Country：Czech Republic  

Event date： 2015.1

Language：English   Presentation type：Oral presentation (general)  

Venue：TKP Garden City, Nagata-cho   Country：Japan  

Event date： 2014.12

Language：English   Presentation type：Oral presentation (general)  

Venue：San Francisco, Moscone Center   Country：United States  

Event date： 2014.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡国際会議場   Country：Japan  

Event date： 2014.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡国際会議場   Country：Japan  

Event date： 2014.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡国際会議場   Country：Japan  

Event date： 2014.10

Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：品川、京都大学東京オフィス   Country：Japan  

Event date： 2014.10

Language：English   Presentation type：Oral presentation (general)  

Venue：JAMSTEC Tokyo Office, Fukokuseimei Bld., Tokyo   Country：Japan  

Event date： 2014.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Tohoku University, Sendai   Country：Japan  

Event date： 2014.9

Language：English  

Venue：National Museum of Emerging Science and Innovation (Miraikan), Tokyo   Country：Japan  

すでに軌道上にあるCloudSat衛星、CALIPSO衛星等のA-train衛星群によって解析された結果と、現状の課題、EarthCARE衛星で期待されるプロダクト、そこから期待される新しいサイエンスに関するサマリーを行った。

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京大学本郷キャンパス1号館710号室   Country：Japan  

Event date： 2014.1 - 2013.1

Language：English   Presentation type：Oral presentation (general)  

Venue：Office Tokyo, Tokyo   Country：Japan  

Event date： 2014.1

Language：English   Presentation type：Oral presentation (general)  

Venue：TKP garden city, Takehashi, Tokyo   Country：Japan  

Event date： 2013.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：仙台国際センター   Country：Japan  

Event date： 2013.7 - 2013.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagoya University, Nagoya   Country：Japan  

JAXA and ESA joint mission, EarthCARE, will carry the four instruments in the same plat form. Among them, there are two next generation active instruments; 95GHz-Doppler radar (CPR) and 355 nm-high spectral resolution lidar (ATLID) and there are also multispectral imager with seven channels (MSI) and broad band radiometer (BBR). The EarthCARE is expected to start observations in late 2015.
The EarthCARE CPR and ATLID might be regarded as extended version of CloudSat 95GHz radar and CALIPSO lidar, respectively. The CPR has higher sensitivity than CloudSat radar and also has the first Doppler capability in space. The ATLID can provide robust profile of backscattering coefficient by the high spectral resolution mechanism. Due to these new features, more complete picture of clouds and aerosols will be obtained.
The CloudSat and CALIPSO have provided the vertical profiles of clouds and aerosols for more than six years. In order to retrieve detail information of cloud and aerosol microphysics, we have developed series of algorithms, e.g., cloud detection, cloud particle type classification, cloud microphysics, aerosol detection, aerosol types and aerosol extinctions algorithms (Hagihara et al., 2010, Yoshida et all.,2010, Okamoto et al, 2010, Sato and Okamoto 2011. The retrieved products from CloudSat and CALIPSO data have been distributed to many institutes and universities for the validation of the GCM and regional models.
The EarthCARE algorithms are developed using the heritage of the algorithms for the CloudSat and CALIPSO. We first review these algorithms and also demonstrated the retrieved cloud and aerosol products from CloudSat and CALIPSO. Some current limitations in the analyses are also discussed. Then we will show the improved algorithms for the EarthCARE and introduce plans of the new cloud and aerosol products.
Finally we describe new ground-based radar and lidar experiments towards the better understanding of the observed signals obtained from the spaceborne active sensors.

Event date： 2013.7

Language：English   Presentation type：Oral presentation (general)  

Venue：ESA-ESTEC, Noordwijk､Netherlands   Country：Netherlands  

Event date： 2013.7

Language：English   Presentation type：Oral presentation (general)  

Venue：ESA-ESTEC, Noordwijk､Netherlands   Country：Netherlands  

Event date： 2013.7

Language：English   Presentation type：Oral presentation (general)  

Venue：ESA-ESTEC, Noordwijk､Netherlands   Country：Netherlands  

Event date： 2013.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Davos, Switzerland   Country：Switzerland  

We examined ice particle types and microphysics in high latitudes by using space-borne active sensors between 2006 and 2012. We developed series of algorithms to retrieve cloud properties by using 95GHz cloud radar on CloudSat and dual-wavelength polarization lidar on CALIPSO. By combining these information, the cloud particle types were classified as three-dimensional ice particles (3D-ice), horizontally oriented ice plates (2D-plate), water and solid and liquid precipitation. The fraction of 2D-plates was larger in high latitude regions than in other regions. Ice microphysics was also studied by combined use of radar reflectivity factor from CloudSat, and lidar backscattering coefficient and depolarization ration from CALIPSO. The vertical and latitudinal distribution of ice particle types and microphysics and their annual variability were also examined. The maximum altitude of clouds is about 10km in high latitudes and that for super cooled water is about 5km. IWC decreased as altitude decreased and zonal mean of the maximum IWC and effective radius were 0.05 g/m^3 and 150µm, respectively. The large particles >100µm were found below 5km in high latitude (>70 degrees north). Land-ocean differences were also noticeable. The IWC was smaller over ocean than over land and ice effective radius was larger over ocean. These properties were further analyzed in relation to temperature and water vapor amount as well as super saturation using ECMWF and AIRS data in order to reveal the formation mechanism of ice particles and its variability.

Other Link： http://www.daca-13.org/index_EN

Event date： 2013.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2013.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：国立オリンピック記念青少年総合センター、東京   Country：Japan  

Event date： 2013.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京大学本郷キャンパス理学部1号館   Country：Japan  

Event date： 2013.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：応用力学研究所   Country：Japan  

ミリ波レーダとライダの雲観測の歴史、特に初期から現在までの国内外の各研究機関における状況について
簡単に振り返った。次ぎに、理論的背景として、レーダ方程式、
ライダ方程式と、そこに現れる雲やエアロゾルの微物理特性との
関係について、実験室データや、航空機による現場観測データを紹介しながら、
解説した。
地上と船舶におけるミリ波レーダとライダによる雲同時観測と解析の結果を
紹介した。それらを発展させた形で、人工衛星に搭載されたこれらの測器のその
データの解析の現状について紹介した。さらに、雲度プロファイラを、ミリ波レーダによるドッ
プラー速度、ライダ観測との同時観測データと解析の状況、期待される事などについても述べた。
また、解析に必要な電磁波の散乱理論についても解説を行った。

Event date： 2013.1

Language：English   Presentation type：Oral presentation (general)  

Venue：TKP ochanomizu conference center ,okyo   Country：Japan  

Event date： 2012.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Moscone Center, San Francisco   Country：United States  

We conducted multi-year analyses of ice microphysics using CloudSat and CALIPSO data. Inter-annual variability, land-ocean differences and seasonal changes of ice microphysical properties were reported for the observation periods from 2006 to 2009. CALIPSO changed the laser tilt angle from 0.3 degrees to 3 degrees off nadir direction on November 2007 and the zonal mean properties of backscattering coefficient and depolarization ratio were significantly decreased and increased, respectively, for low altitude after November 2007. This could be explained by the different backscattering behavior of horizontally oriented ice crystals for the different laser tilt angles.
On the other hand, inter-annual variability of zonal mean properties of reflectivity factor observed by CloudSat showed the very similar characteristics during the four years. In addition, the lidar observables were similar when the monthly mean properties were compared for different years before November 2007 and also the same was true for the comparisons after November 2007. These analyses of observables suggested that the inter-annual variability of zonal mean properties of ice microphysics could be considered to be similar. Application of the radar-lidar algorithm showed that the change of the laser tilt angle introduced the large gap between the ice microphysical properties before and after November 2007, if the proper treatment of the oriented ice crystals were not conducted in the retrievals. Global analysis of cloud particle types showed that the frequent occurrence of oriented ice crystals were identified in the temperature range between -10 to -20 degrees C. It is also noted that the significant overestimation of ice water content and significant underestimation of ice effective radius were found if the scattering properties of the horizontally oriented ice particles were not considered. Therefore it is highly demanded that the realistic ice orientation model is implemented in the look up tables used in the retrieval algorithm for CloudSat and CALIPSO.
We have tested several orientation models with various parameters such as Gauss distribution model (Sassen 1980) and Klett type distribution function (Klett 1985) to estimate the look up tables for the laser tilt angles of 0.3 and 3 degrees off nadir. And the best orientation model can be determined by minimizing the inter-annual variability of ice microphysics. The best model showed the inter-annual variability of ice microphysics are about 30% for the retrieved IWC and effective radius and about 60% for mass fraction of oriented ice particles in low altitude regions. And ice microphysics over land tended to be larger than the values over ocean and the differences between over land and ocean were much larger than the uncertainties that attributed to the ice particle orientation. The inter-relationship between IWC and effective radius turned out to be very consistent for different years and also for over land and ocean. The frequency distribution of IWC (and effective radius) was different over land and ocean.

Event date： 2012.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2012.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2012.11

Language：English   Presentation type：Oral presentation (general)  

Venue：tokyo   Country：Japan  

Event date： 2012.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

2006年4月に打ち上げられた95GHz雲レーダ搭載のCloudSat衛星と, 2波長偏光ライダCALIOPを搭載したCALIPSO衛星を組み合わせによって, 氷粒子の微物理特性を抽出する手法の開発を行ってきた.
CloudSatとCALIPSOの双方で検出される雲の解析用アルゴリズムがまず開発され(Okamoto et al., 2010), これを元に, どちらかのセンサで検出される雲域にも適用可能な形に拡張された（Sato and Okamoto 2011）.CALIOP観測では2007年11月以前には, レーザ光の角度が天底角0.3度で, そのあとの期間では天底角が3度に変更されている. この変更は水平面に配向した板状の氷粒子からの強い後方散乱（鏡面散乱）の影響を避けるために提案されたものである.この変更によって, どの程度板状氷粒子の影響を避けることができたのかは明らかではなく, また微物理特性の抽出精度も明らかになっていなかった.
　今回, ライダの天底角変更の前後を含むデータを用いて氷粒子微物理特性の全球解析を行うことによって,微物理量の不確定性を検証する手法について提案する.

Event date： 2012.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Dahlem Cube, Berlin   Country：Germany  

We develop algorithms that can be applied to EarthCARE Cloud Profiling Radar (CPR) and Atmospheric backscatter LIdar (ATLID) and discuss about the expected products. EarthCARE will carry CPR and ATLID and these combination corresponds to the CloudSat and CALIPSO for the A-train. Due to the similarities between the EarthCARE and the A-train, it will be possible to apply the similar types of algorithms that have been already developed and extensively used for the analyses of the A-train satellites and it is therefore expected to obtain the similar cloud products for the EarthCARE. On the other hand, there are some differences between the EarthCARE and A-train satellites, e.g., the EarthCRAE CPR has better sensitivity compared with the CloudSat. And Doppler capability of the EarthCARE-CPR is a new element and is expected to provide the better constraint for the retrievals of cloud/precipitation microphysics. And the vertical air motion and sedimentation velocity of cloud particles will be inferred.

Other Link： http://www.irs2012.org/information/general_information.html

Event date： 2012.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Porto Heli conference center, Proto Heli   Country：Greece  

We improved the radar and lidar algorithm that can be applied to CloudSat and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) data to retrieve ice microphysics. The essential modification is the implementation of distribution of tilt angles of ice plates respect to the horizontal plane. We introduced the Gauss-type and Klett-type distribution functions in the improved version of the algorithm. The backscattering signatures in radar and lidar wavelengths were calculated for the same particle type and orientation by using the discrete dipole approximation and physical optics, respectively.
Introducing the distribution of orientations lead to the large reduction of lidar backscattering coefficient compared with that for perfectly oriented ice plates with same effective radius and mass but larger than that for spheres for the CALIPSO tilt angle of 0.3o.
The effective radius and ice water content were similar between the improved and old algorithms. Mass fraction of oriented crystals to the total IWC became much larger in the improved algorithms when the specular reflection was observed.

Event date： 2012.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Paris   Country：France  

Event date： 2012.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：つくば国際会議場   Country：Japan  

2006 年 4 月に打ち上げられた 95GHz 雲レーダ搭載の CloudSat 衛星と, 2 波長偏光ライダ CALIOP を搭載した CALIPSO 衛星を組み合わせることで, 氷粒子に関する詳 細な微物理特性が抽出されるようになった. ここ使用す る衛星用の解析アルゴリズムは, CloudSat 衛星から得ら れるレーダ反射因子と, CALIOP センサから得られる波長 532nm における後方散乱係数と偏光解消度の情報を利用 し、有効半径、氷水量そして全氷水量に対する板状氷粒 子の質量の割合を求めるものである(Okamoto et al., 2010, Sato and Okamoto 2011). CALIOP 観測では 2007 年 11 月以前には, レーザ光の角度が天底角 0.3 度であり, 非常に強い後方散乱係数と 0 に近い偏光解消度が観測さ れるいわゆる鏡面散乱の卓説した領域が気温-20 度から -10 度の間で 1 割程度の出現頻度で存在することが知ら れている(Yoshida et al., 2010). これらの物理特性を 示す氷粒子は, 理論計算や地上におけるスキャン型のラ イダ観測から, 平板状の粒子が水平面において, 偏りを 持って分布する配向状態にある場合に起きると考えられ ている(以後, 分散型 2D-plate と呼ぶ). しかし 2007 年 11 月に天底角が 3 度に変更されて以降のデータで 0.3 度 の時と同じ条件で粒子のタイプ識別を行ったところ, 板 状氷粒子の出現頻度は低下した(平形 2010 修士論文). こ れは 3 度の場合では後方散乱係数の値は平均的に減少し, また同時に偏光解消度の増加が観測されたことに起因す る.このようにレーザ光の入射角を変化するだけで観測 量は大きな変化を受けるため, 粒子散乱の形状と配向を 理論的に正しく評価することが,微物理特性の情報を抽 出する上で重要となる. 本研究では, 分散型 2D-plate の 後方散乱特性を理論的に求め, それに基づく参照テーブ ルを作成し, CloudSatとCALIPSOの同時解析から分散型 2D-plate の出現頻度を解析した結果について報告する.

Event date： 2012.5

Presentation type：Oral presentation (general)  

Venue：東京都国立オリンピック記念青少年総合センター   Country：Japan  

Event date： 2011.12

Presentation type：Oral presentation (general)  

Venue：カリフォルニア、サンフランシシコ   Country：United States  

Event date： 2011.11

Presentation type：Oral presentation (general)  

Venue：名古屋　名古屋大学   Country：Japan  

Event date： 2011.10

Presentation type：Oral presentation (general)  

Venue：京都テルサ、京都   Country：Japan  

Event date： 2011.6 - 2011.7

Presentation type：Oral presentation (general)  

Country：Japan  

Other Link： http://www.iugg2011.com/

Event date： 2011.6

Presentation type：Oral presentation (general)  

Venue：Otto Maass Chemistry Building, McGill University, Montreal, Canada   Country：Canada  

Event date： 2011.5 - 2011.10

Presentation type：Oral presentation (general)  

Venue：国立オリンピック記念青少年総合センター、東京   Country：Japan  

Event date： 2011.5

Presentation type：Oral presentation (invited, special)  

Venue：国立オリンピック記念青少年総合センター、東京   Country：Japan  

Event date： 2011.3

Venue：気象研究所、つくば   Country：Japan  

Event date： 2010.12

Venue：TKP building, Tokyo   Country：Japan  

Event date： 2010.12

Presentation type：Oral presentation (general)  

Venue：TKP building, Tokyo   Country：Japan  

Event date： 2010.8

Presentation type：Oral presentation (general)  

Venue：Sendai, Miyagi   Country：Japan  

Event date： 2010.7

Presentation type：Oral presentation (general)  

Venue：ロシア　サンクトペテルスブルグ   Country：Russian Federation  

Event date： 2010.7

Presentation type：Oral presentation (general)  

Venue：ロシア　サンクトペテルスブルグ   Country：Russian Federation  

Event date： 2010.6 - 2010.7

Presentation type：Oral presentation (general)  

Venue：Portland, USA   Country：United States  

Event date： 2010.6

Presentation type：Oral presentation (general)  

Venue：第一鉄鋼ビル（東京）   Country：Japan  

Event date： 2010.5

Presentation type：Oral presentation (general)  

Venue：東京　代々木   Country：Japan  

Event date： 2024.3

Language：English   Presentation type：Oral presentation (general)  

Venue：on line   Country：Japan  

Event date： 2024.2

Language：Others   Presentation type：Oral presentation (general)  

Venue：Università del Salento, Lecce   Country：Italy  

Event date： 2023.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Frascati(Rome), ESA-ESRIN   Country：Italy  

Event date： 2023.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Frascati, ESA ESRIN   Country：Italy  

Event date： 2023.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Frascati (Rome), ESA-ESRIN   Country：Italy  

Event date： 2023.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2023.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Frascati(Rome), ESA-ESRIN   Country：Italy  

Event date： 2023.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Frascati (Rome), ESA-ESRIN   Country：Italy  

Event date： 2023.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Frascati, ESA-ESRIN   Country：Italy  

Event date： 2023.10 - 2023.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：on-line   Country：Japan  

Event date： 2023.10

Language：Japanese  

Venue：仙台   Country：Japan  

Event date： 2023.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：仙台   Country：Japan  

Event date： 2023.9

Language：Japanese  

Venue：つくば市   Country：Japan  

Event date： 2023.7

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Berlin   Country：Germany  

Event date： 2023.7 - 2024.5

Language：Japanese  

Venue：Berlin   Country：Germany  

Event date： 2023.4 - 2024.5

Language：English   Presentation type：Oral presentation (general)  

Venue：小金井市   Country：Japan  

Event date： 2023.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Hotel Laforet Shuzenji, Izu city, Shizuoka   Country：Japan  

Event date： 2022.11

Language：English   Presentation type：Oral presentation (general)  

Venue：ESA ESTEC, Noordwijk, The Netherlands   Country：Netherlands  

Event date： 2022.11

Language：English   Presentation type：Oral presentation (general)  

Venue：On line   Country：Japan  

Event date： 2022.11

Language：English   Presentation type：Oral presentation (general)  

Venue：on line   Country：Japan  

Event date： 2022.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学、札幌   Country：Japan  

Event date： 2022.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学、札幌   Country：Japan  

Event date： 2022.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学、札幌   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福山大学   Country：Japan  

Event date： 2022.8

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：on-line   Country：China  

Event date： 2022.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Thessaloniki Concert Hall (Building B), Thessaloniki, Greece   Country：Greece  

Event date： 2022.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Thessaloniki, Greece   Country：Greece  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Venue：online   Country：Japan  

Event date： 2022.5

Language：English   Presentation type：Oral presentation (general)  

Venue：online   Country：Japan  

Event date： 2022.2

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2022.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

EarthCARE衛星プロジェクトの活動のサマリーを、プロジェクトのリーダとしてY2021 The Joint PI Meeting of JAXA Earth Observation Missions でplenary sessionで講演した。

Event date： 2022.1

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：三重大学とオンライン   Country：Japan  

Event date： 2021.11

Language：English   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2021.6

Language：English   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Netherlands  

Event date： 2021.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2021.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催 (実行委員会本部： 東北工業大学)   Country：Japan  

Event date： 2021.3

Language：English   Presentation type：Oral presentation (general)  

Venue：on line   Country：Netherlands  

Event date： 2021.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：on line   Country：Japan  

Event date： 2020.12

Language：English   Presentation type：Oral presentation (general)  

Venue：on line   Country：Japan  

Event date： 2020.11

Language：English   Presentation type：Oral presentation (general)  

Venue：VIrtual meeting   Country：United States  

Event date： 2020.11

Language：English   Presentation type：Oral presentation (general)  

Venue：on line   Country：Japan  

Event date： 2020.11

Language：English   Presentation type：Oral presentation (general)  

Venue：on line/ESA ESTEC   Country：Netherlands  

Event date： 2020.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：on line   Country：Japan  

Event date： 2020.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Nara   Country：Japan  

Event date： 2020.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン開催 (実行委員会本部： 東北工業大学)   Country：Japan  

Event date： 2020.6 - 2021.6

Language：English   Presentation type：Oral presentation (general)  

Venue：on line   Country：Japan  

Event date： 2020.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Virtual meeting   Country：Japan  

Event date： 2020.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Virtual meeting   Country：Japan  

Event date： 2020.5

Language：English   Presentation type：Oral presentation (general)  

Venue：virtual meeting   Country：Japan  

Event date： 2020.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：幕張   Country：Japan  

Event date： 2020.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.2

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2020.1

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2020.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡国際会議場   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡国際会議場   Country：Japan  

Event date： 2019.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Fukuoka   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Hawaii   Country：United States  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：千葉大学西千葉キャンパス   Country：Japan  

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：千葉大学西千葉キャンパス   Country：Japan  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Zhejiang University   Country：China  

Event date： 2019.8

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京大学柏キャンパス   Country：Japan  

Event date： 2019.7 - 2020.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Montreal   Country：Canada  

Event date： 2019.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Hefei   Country：China  

Event date： 2019.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Hawaii   Country：United States  

Event date： 2019.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Okinawa Institute of Science and Technology Graduate University (OIST)   Country：Japan  

Event date： 2019.5

Language：English   Presentation type：Oral presentation (general)  

Venue：幕張   Country：Japan  

Event date： 2019.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：つくば   Country：Japan  

Event date： 2019.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2019.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Rome   Country：Italy  

Event date： 2019.3 - 2019.6

Language：English   Presentation type：Oral presentation (general)  

Venue：ESA Frascati   Country：Italy  

Event date： 2019.1

Language：English   Presentation type：Oral presentation (general)  

Venue：TKP東京駅日本橋カンファレンスセンター   Country：Japan  

Event date： 2018.11

Language：English   Presentation type：Oral presentation (general)  

Venue：TKP, Tokyo Yaesu Conference Center   Country：Japan  

Event date： 2018.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Florida Atlantic University   Country：United States  

Event date： 2018.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：仙台国際会議場   Country：Japan  

Event date： 2018.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Kurume   Country：Japan  

Event date： 2018.6 - 2019.6

Language：English  

Venue：Bonn   Country：Germany  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Bonn   Country：Germany  

Event date： 2018.4 - 2019.4

Language：English   Presentation type：Oral presentation (general)  

Venue：ウイーン   Country：Austria  

Event date： 2018.1

Language：English   Presentation type：Oral presentation (general)  

Venue：TKP Garden city Takehashi   Country：Japan  

Event date： 2017.12

Language：English   Presentation type：Oral presentation (general)  

Venue：TKP Tokyo station Yaesu conference center   Country：Japan  

Event date： 2017.10 - 2017.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2017.10 - 2017.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2017.10 - 2017.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2017.10 - 2017.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Bexco, Busan   Country：Korea, Republic of  

Event date： 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Bexco, Busan   Country：Korea, Republic of  

Event date： 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Bexco, Busan   Country：Korea, Republic of  

Event date： 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Bexco, Busan   Country：Korea, Republic of  

Event date： 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Bexco, Busan   Country：Korea, Republic of  

Event date： 2017.9

Language：English   Presentation type：Oral presentation (general)  

Venue：東京大学本郷キャンパス   Country：Japan  

Event date： 2017.8 - 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：情報通信研究機構、小金井   Country：Japan  

Event date： 2017.8 - 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：情報通信研究機構、小金井   Country：Japan  

Event date： 2017.8 - 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：情報通信研究機構、小金井   Country：Japan  

Event date： 2017.8 - 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：情報通信研究機構、小金井   Country：Japan  

Event date： 2017.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Politehnica University of Bucharest, Bucharest   Country：Romania  

Event date： 2017.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Politehnica University of Bucharest, Bucharest   Country：Romania  

Event date： 2017.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Politehnica University of Bucharest, Bucharest   Country：Romania  

Event date： 2017.6

Language：English   Presentation type：Oral presentation (general)  

Venue：ESA-ESTEC, NOORDWIJK   Country：Netherlands  

Event date： 2017.6 - 2018.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Columbia University   Country：United States  

Event date： 2017.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2017.5 - 2018.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Okinawa Institute of Science and Technology Graduate University (OIST)   Country：Japan  

Event date： 2017.5 - 2018.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Makuhari messe, Chiba   Country：Japan  

Event date： 2017.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Makuhari Messe, Chiba   Country：Japan  

Event date： 2017.1

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：ＴＫＰ Takehashi, Conference room   Country：Japan  

Event date： 2017.1

Language：English   Presentation type：Oral presentation (general)  

Venue：TKP Takehashi, Conference room   Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Tokyo TKP, Tokyo Yaesu Conference Center   Country：Japan  

Event date： 2016.11

Language：English   Presentation type：Oral presentation (general)  

Venue：東京大学本郷キャンパス   Country：Japan  

Event date： 2016.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京大学本郷キャンパス   Country：Japan  

Event date： 2016.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：INO, Quebeck, Canada   Country：Canada  

Event date： 2016.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：INO, Quebeck, Canada   Country：Canada  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)