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Hajime Okamoto Last modified date:2017.11.13

Graduate School
Administration Post

Main topics of atmospheric physics group are aerosol, clouds, precipitation related physics. .
Academic Degree
Dr. of science
Field of Specialization
Satellite remote sensing, cloud physics, aerosols, atmospheric physics, light scattering
Outline Activities
I focus on remote sensing of clouds and aerosols, atmospheric radiation and water cycle in the climate system. We develop algorithms for global analyses of clouds and aerosols. Observational tools include cloud profiling radar and lidar onboard satellite for better understanding of global energy and water cycle. We also play an active role in international satellite missions and also planning new satellite missions.
This group conducts the following researches;
(1) Analyses of cloud macroscale and microphysical properties from satellite remote sensing.
(2) Analyses of radiative properties of aerosols from lidar.
(3) Evaluation of numerical models.
(4) Light scattering by non-spherical particles
(5) Multiple scattering process of cloud particles for liar and radar remote sensing
(6) Development of algorithms for JAXA-ESA mission EarthCARE.
(7) Defining future satellite missions.
Research Interests
  • JAXA-EarthCARE mission project scientist.
    keyword : satellite, EarthCARE, cloud radar, Doppler, lidar、cloud, aerosol, radiation budget, water budget, climate change
  • co-chair of Japan-EU EarthCARE mission since July 2013.
    keyword : EarthCARE mission, Earth Observing Satellite
  • (1) Analyses of cloud macroscale and microphysical properties from satellite remote sensing.
    (2) Analyses of radiative properties of aerosols from lidar.
    (3) Light scattering by non-spherical particles
    (4) Multipel scattering due to cloud particles in radar and lidar remote sensing
    keyword : Clouds, aerosols, remote sensing, light scattering
Academic Activities
1. Okamoto H., K. Sato, T. Nishizawa, N. Sugimoto, T. Makino, Y. Jin, A. Shimizu, T. Takano, M. Fujikawa, Development of a multiple-field-of-view multiple-scattering polarization lidar: comparison with cloud radar, Opt. Express, 24, 26,, 2016.12.
2. Hiroshi Ishimoto, Kozo Okamoto, Okamoto Hajime, Sato, K., One-dimensional variational (1D-Var) retrieval of middle to upper tropospheric humidity using AIRS radiance data., J. Geophys. Res. Atmosphere, 119, DOI: 10.1002/2014JD021706, 2014.06.
3. Iwabuchi H., Yamada, S., Katagiri, S., Yang, P., Okamoto H., Radiative and Microphysical Properties of Cirrus Cloud Inferred from Infrared Measurements Made by the Moderate Resolution Imaging Spectroradiometer (MODIS). Part I: Retrieval Method, J. Appl. Meteor. and Clim., 53, 5, 1297-1316, 53, 2014.05.
4. Hagihara Yuichiro, Okamoto Hajime, Zhengzhao Luo, Joint analysis of cloud-top heights from CloudSat and CALIPSO: New insights into cloud-top microphysics, J. Geophys. Res. Atmosphere, 119, doi:10.1002/2013JD020919, 2014.04.
5. Hashino Tempei, Masaki Satoh, Hagihara Yuichiro, Kubota Takuji, Matsui Toshihisa, Nasuno Tomoe, Okamoto Hajime, Evaluating cloud microphysics from NICAM against CloudSat and CALIPSO, J. Geophys. Res. Atmosphere, 118, J. Geophys. Res. Atmos., 118, 7273–7292, doi:10.1002/jgrd.50564., 2013.07.
6. Anatoli Borovoi, Alexander Konoshonkin,, Natalia Kustova, Okamoto Hajime, Backscattering Mueller matrix for quasi- horizontally oriented ice plates of cirrus clouds: application to CALIPSO signals, Opt. Express, 20, 28222-28233, 2012.12, [URL].
7. Nishizawa T., S. Nobuo, I. Matsui, A. Shimizu, H. Okamoto, Algorithms to Retrieve Optical Properties of Three-Component Aerosols from Two-Wavelength Backscatter and One-Wavelength Polarization Lidar Measurements: Considering Nonsphericity of Dust, J Quant. Spectrosc. Radiative Transfer, 112, 2, doi:10.1016/j.jqsrt.2010.06.002, 2011.11.
8. Sato, K., H. Okamoto, Refinement of global ice microphysics using spaceborne active sensors, J. Geophys. Res. -Atmosphere, 116, D20202, doi: 10.1029/2011 JD01588, 2011.10.
9. Okamoto, Hajime, Sato, K., Hagihara, Yuichiro, Global analysis of ice microphysics from CloudSat and CALIPSO: Incorporation of specular reflection in lidar signals, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 115, 2010.11.
10. Sato Kaori, Okamoto Hajime, Takemura Toshihiko, Kumagai Hiroshi, Sugimoto Nobuo, Characterization of ice cloud properties obtained by shipborne radar/lidar over the tropical western Pacific Ocean for evaluation of an atmospheric general circulation model, J. Geophys. Res., 115, 2010.08.
11. Yoshida Ryo, Okamoto Hajime, 萩原 雄一朗, Ishimoto Hiroshi, Global analysis of cloud phase and ice crystal orientation from CALIPSO data using attenuated backscattering and depolarization ratio, J. Geophys. Res., 115, D00H32, 2010.08, [URL].
12. 萩原 雄一朗, Okamoto Hajime, Yoshida Ryo, Development of a combined CloudSat-CALIPSO cloud mask to show global cloud distribution, J. Geophys. Res., 115, 2010.09, [URL].
13. Min Deng, Gerald G. Mace, Zhien Wang, Okamoto Hajime, Tropical Composition, Cloud and Climate Coupling Experiment validation for cirrus cloud profiling retrieval using CloudSat radar and CALIPSO lidar, J. Geophys. Res., 115, doi:10.1029/2009JD013104, 15, D00J15, 2010, 2010.09, [URL].
14. Sato Kaori, Okamoto Hajime, Yamamoto, M. K., Fukao S., Kumagai Hiroshi, Ohno Yuichi, Horie Hiroaki, Abo M., 95-GHz Doppler radar and lidar synergy for simultaneous ice microphysics and in-cloud vertical air motion retrieval, J. Geophys. Res., 114, D03203, doi:10.1029/2008JD010222, 2009 , 2009.02.
15. Okamoto, H., T. Nishizawa, T. Takemura, K. Sato, H. Kumagai, Y. Ohno, N. Sugimoto, A. Shimizu, I. Matsui, and T. Nakajima, Vertical cloud properties in the tropical western Pacific Ocean: Validation of the CCSR/NIES/FRCGC GCM by shipborne radar and lidar, J. Geophys. Res., 113, D24213, doi:10.1029/2008JD009812, 2008. , 2008.10.
16. Nishizawa, T., H. Okamoto, T. Takemura, N. Sugimoto, I. Matsui, and A. Shimizu, Aerosol retrieval from two-wavelength backscatter and one-wavelength polarization lidar measurement taken during the MR01K02 cruise of the R/V Mirai and evaluation of a global aerosol transport model,, J. Geophys. Res., 113, D21201, doi:10.1029/2007JD009640, 2008. , 2008.10.
17. Nishizawa, T., N. Sugimoto, I. Matsui, A. Shimizu, B. Tatarov and H. Okamoto, Algorithm to Retrieve Aerosol Optical Properties From High-Spectral-Resolution Lidar and Polarization Mie-Scattering Lidar Measurements, IEEE Trans. Geosci. Remote Sens., vol. 46, no. 12, pp. 4094-4103, Dec. DOI: 10.1109/TGRS.2008.2000797, 2008. , 2008.10.
18. Heymsfield, A. J., A. Protat, R. Austin, D. Bouniol, R. Hogan, H. Okamoto, K. Sato, G. Zadelhoff, D. Donovan, and Z. Wang, Testing and evaluation of ice water content retrieval methods using radar and ancillary measurements, J. Appl. Meteor. Climate, 47, 135–163. 2008. , 2008.10.
19. Okamoto, H., T. Nishizawa, T. Takemura, H. Kumagai, H. Kuroiwa, N. Sugimoto, I. Matsui, A. Shimizu, A. Kamei, S. Emori, and T. Nakajima, Vertical cloud structure observed from shipborne radar and lidar,: mid-latitude case study during the MR01/K02 cruise of the R/V Mirai, J. Geophys. Res., 112, D06212, doi:10.1029/2006JD007435,2007. , 2007.10.
20. Nishizawa, T., H. Okamoto, N. Sugimoto , I. Matsui, A. Shimizu , K. Aoki, An algorithm that retrieves aerosol properties from dual-wavelength polarized lidar measurements, J. Geophys. Res., 112, D06212, doi:10.1029/2006JD007435,2007, 2007.10.
21. Sato, K., and H. Okamoto, Characterization of Ze and LDR of nonspherical and inhomogeneous ice particles for 95-GHz cloud radar, J. Geophys. Res., 111, D22213, doi:10.1029/2005JD006959, 2006. , 2006.10.
22. S. Iwasaki, Y. Tsushima, R. Shirooka, R. Katsumata, K. Yoneyama, I. Matsui, A. Shimizu, N. Sugimoto, A. Kamei, H. Kuroiwa, H. Kumagai, Okamoto Hajime, Subvisual cirrus cloud observations using a 1064-nm lidar, a 95 GHz cloud radar, and radiosondes in the warm pool region, Geophys. Res. Lett., 31, 9, 31, L09103, doi: 10.1029/2003GL019377, 2004. , 2004.05.
23. Okamoto Hajime, An algorithm for retrieval of cloud microphysics using 95-GHz cloud radar and lidar., J. Geophys. Res., 108(D7, 4226), doi:10.1029/2001JD0001225, 2003., 2003.10.
24. Okamoto, H, Information content of the 95-GHz cloud radar signals: Theoretical assessment of effects of nonsphericity and error evaluation of the discrete dipole approximation, J. Geophys. Res., 107, D22, 107 (D22, 4628) , doi: 10.1029/2001JD001386, 2002. , 2002.11.
25. Iwasaki, S., and H. Okamoto, Analysis of the enhancement of backscattering by nonspherical particles with flat surfaces, Appl. Opt.,, 40(33), 6121-6129, 2001., 2001.10.
26. Horie, H., T. Iguchi, H. Hanado, H. Kuroiwa, H. Okamoto and H. Kumagai, Development of A 95-GHz airborne cloud profiling radar (SPIDER) -- Technical aspects --, IEICE Trans. Commun,, E83-B, 2010-2020, 2000. , 2000.10.
27. Murayama, T; Okamoto, H; Kaneyasu, N; Kamataki, H; Miura, K, Application of lidar depolarization measurement in the atmospheric boundary layer: Effects of dust and sea-salt particles, J. Geophys. Res., 104, D24, 31781-31792, 104, 31781-31792, 1999., 1999.12.
28. Lemke, H., H. Okamoto, and M. Quante, Comments on error analysis of backscatter from discrete dipole approximation for different ice particle shapes, Atmos. Res., 49, 189-197, 1998., 1998.10.
29. Okamoto, H; Xu, YL, Light scattering by irregular interplanetary dust particles, Earth, Planets and Space, 50, 6-7, 577-585, 1998.01.
30. Okamoto, H., A.Macke, M.Quante, E.Raschke, Modeling of backscattering by non-spherical ice particles for the interpretation of cloud radar signals at 94GHz., Contr. Atmos. Phys., 68, 319-334, 1995. , 1995.10.
31. Okamoto, H., Light scattering by clusters : the a1-term method, Optical Review, 2, 407-412, 1995., 1995.10.
32. Okamoto, H., T.Mukai, T. Kozasa, The 10µm feature of aggregates in comets, Planetary and Space Science, 42, 643-649, 1994. , 1994.10.
33. Mann, I., H.Okamoto, T.Mukai, H.Kimura, Y.Kitada, Fractal aggregate analogues for near solar dust properties, Astronomy and Astrophysics, 291, 1011-1018, 1994. , 1994.10.
1. Okamoto, Hajime, EarthCARE mission : move the global models to next levels, 7th JAPAN-EU workshop (第7回日EU気候変動研究ワークショップ), 2016.04.26.
2. Okamoto, Hajime, Sato Kaori, Takano, Toshiaki, Nishizawa,Tomoaki, Sugimoto, Nobuo, Jin, Yoshitaka, Development of multiple scattering polarization lidar to observe depolarization ratio of optically thick low- level clouds
, IRS2016, 2016.04.20.
3. Okamoto, Hajime, Sato Kaori, Hagihara, YuichiroYuichiro, Ishimoto, Hiroshi, Relationship between ice supersaturation and ice microphysics inferred from CloudSat, CALIPSO and AIRS
, IRS 2016, 2016.04.20.
4. Okamoto, Hajime, Sato Kaori, Ishimoto, H., Hagihara, Y., Global analysis of generation mechanism of ice microphysics inferred from space-borne active sensors and infrared sounder, AGU fall meeting , 2015.12.15.
5. Okamoto, Hajime, Sato Kaori, Hagihara, Y., Ishimoto, H., Borovoi, A., Konoshonkin, A., Kusutoba, N., Evaluation of retrieval algorithms for ice microphysics using CALIPSO/CloudSat and EarthCARE, 27th International Laser Radar Conference, 2015.07.07.
6. Okamoto, Hajime, Sato Kaori, Makino, T., Nishizawa, T., Jin, Y., Sugimoto, N., Shimizu, A., Depolarization ratio of clouds measured by multiple-field of view multiple scattering polarization lidar, 27th International Laser Radar Conference, 2015.07.07.
7. Okamoto, Hajime, Sato Kaori, Ishimoto, Hiroshi, Tanaka, Kenta, Global analysis of ice microphysics and ice super-saturation from CloudSat, CALIPSO and AIRS, 26th IUGG General Assembly, 2015.06.23.
8. Okamoto, Hajime, Development of level 2 algorithms for CPR, CPR-ATLID and CPR-ATLID-MSI, Joint PI meeting of Global Environment Observation Mission 2014, 2015.01.13.
9. Okamoto, Hajime, Sato, K., Hagihara, Yuichiro, Tanaka, Kenta, Ishimoto, Hiroshi, Makino, Toshiyuki, Nishizawa, Tomoaki, Sugimoto, Nobuo, Evaluation of ice cloud retrievals using CloudSat/CALIPSO/MODIS/AIRS and EarthCARE, AGU Fall Meeting, 2014.12.15.
10. Okamoto, Hajime, Satellite remote sensing of cloud properties and generation mechanism, GRENE-AWI workshop on Atmospheric Research 2014, 2014.10.15.
11. Okamoto, Hajime, Global analysis of cloud microphysics by space-borne active sensors from A-Train to EarthCARE, Tohoku-DLR Workshop, 2014.10.14.
12. Okamoto Hajime, EarthCARE science towards understanding nature of clouds, aerosols, radiation and cloud motion, EarthCARE Workshop 2014, 2014.09.17.
13. Okamoto Hajime, JAXA science status 2013-2014, EarthCARE JMAG meeting, 2014.01.23.
14. 岡本 創, 佐藤 可織, 萩原 雄一朗, Development of level 2 algorithms for CPR, CPR-ATLID, and CPR-ATLID-MSI, Joint PI workshop of environment observation mission 2014, 2014.01.14.
15. Okamoto Hajime, EarthCARE mission : Development of algorithms, The 3rd International Symposium of Atmospheric Light Scattering and Remote Sensing (ISALSaRS'13), 2013.07.30.
16. Okamoto Hajime, JAXA science status 2013, EarthCARE Joint Mission Advisory Group meeting, 2013.07.17.
17. Okamoto Hajime, Sato Kaori, Hagihara Yuichiro, CPR-ATLID/CPR-ATLID-MSI products and algorithms, EarthCARE Joint Algorithm Development Endeavor meeting, 2013.07.16.
18. Okamoto Hajime, Sato Kaori, Hagihara Yuichiro, CPR-only level2a product for EarthCARE, EarthCARE Joint Algorithm Development Endeavor meeting, 2013.07.15.
19. Okamoto Hajime, Sato Kaori, Hagihara Yuichiro, Ishimoto Hiroshi, Ice particle type and microphysics in high latitudes by spaceborne active sensors : regional characteristic and annual variability , Davos-Atmosphere and Cryosphere Assembly, 2013(DACA-13) , 2013.07.08, [URL].
20. Okamoto Hajime, Sato Kaori, Hagihara Yuichiro, CPR/CPR-ATLID/CPR-ATLID-MSI products and algorithms, EarthCARE science meeting, 2013.06.17.
21. Okamoto Hajime, Sato Kaori, 萩原 雄一朗, Development of level 2 algorithms for CPR/CPR-ATLID/CPR-ATLID-MSI, EarthCARE PI workshop, 2013.01.
22. Okamoto Hajime, Sato Kaori, 萩原 雄一朗, Multi-year analysis of ice microphysics derived from CloudSat and CALIPSO, American Geophysical Union fall meeting 2012, 2012.12.
23. Okamoto Hajime, Sato Kaori, 萩原 雄一朗, Synergy level 2b products Japan, EarthCARE JADE meeting, 2012.11.26.
24. Okamoto Hajime, Teruyuki Nakajima, JAXA science status, EarthCARE Joint Mission Advisory Group meeting , 2012.11.26.
25. Okamoto Hajime, Sato Kaori, 萩原 雄一朗, Hirakata Maki, CPR level 2a products Japan, EarthCARE JADE meeting, 2012.11.
26. Okamoto Hajime, Sato Kaori, 萩原 雄一朗, Tomoaki Nishizawa, Development of Level 2 Algorithms for EarthCARE CPR/ATLID, International Radiation Symposium 2012, 2012.08, [URL].
27. Okamoto Hajime, Sato Kaori, 萩原 雄一朗, Takuya Matsumoto, Anatoli Borovoi, Retrieved ice microphysics from CALIPSO and CloudSat and horizontally oriented ice plates , 26th International laser radar conference (ILRC), 2012.06.28.
28. Okamoto Hajime, Sato Kaori, 萩原 雄一朗, Global Analyses of cloud Properties from CloudSat and CALIPSO and Development of the Level 2 Algorithms for EarthCARE, CloudSat-CALIPSO-EarthCARE joint workshop, 2012.06.12.
29. , [URL].
Membership in Academic Society
  • American Geophysical Union
  • American Meteorological Society
  • Japan Meteorological Society
Other Educational Activities
  • 2014.09, Master course student, Toshiyuki Makino, received Hirono awards in the 32nd laser sensing symposium in September 2014. .
Professional and Outreach Activities
Science team member of CloudSat and CALIPSO satellites
ESA-JAXA mission EarthCARE Joint Mission Advisory Group (JMAG) member.