Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2025EA004322

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Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2025GL114658

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Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2024JA033688

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

<jats:title>Abstract</jats:title><jats:p>Using the Japanese Atmospheric General circulation model for the Upper Atmosphere Research-Data Assimilation System (JAGUAR-DAS), a whole neutral atmosphere reanalysis dataset (JAWARA) over about 19 years from September 2004 to December 2023 is produced. JAWARA is the first long-period reanalysis covering the height region from the surface to the lower thermosphere (~ 110 km). This wide height coverage is a notable advantage over other operational reanalysis datasets, which cover up to the middle mesosphere. Key dynamical characteristics are compared between JAWARA and two satellite observations and three other operational reanalysis datasets in their covered height regions. The seasonal variations of zonal mean temperature and zonal wind are similar between JAWARA and the datasets used for comparison. The climatologies of zonal mean temperature, zonal wind, residual-mean circulation, and E-P flux in the meridional cross section are also broadly consistent with other reanalysis datasets. The analyzed residual-mean vertical flow in the northern high latitudes in the middle atmosphere exhibits the well-known patterns of upwelling in summer and downwelling in winter. JAWARA also shows a prominent feature of strong downward propagating anomalies from the lower thermosphere to the upper stratosphere after sudden stratospheric warmings. This analysis takes full advantage of the JAWARA data, which cannot be made using satellite observations and other reanalysis datasets. This reanalysis product is expected to contribute broadly to future research on the characteristics of observed mesospheric phenomena, thermosphere–ionosphere coupling, space weather, and improvement of middle atmospheric meteorological systems, including their interannual and decadal scale variability.</jats:p>

DOI： 10.1186/s40645-024-00674-3

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Language：Japanese   Publisher：Meteorological Society of Japan  

DOI： 10.24761/tenki.72.5_211

CiNii Research

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

DOI： 10.2151/sola.2025-058

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Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2023JD039881

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Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2023JD039687

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Meteorological Society of Japan  

<p>The dynamical characteristics of the zonal wavenumber 1 (<i>s</i> = 1) Rossby-gravity (RG) wave are examined using recently available reanalysis data for the whole neutral atmosphere over 16 years. An isolated peak is detected in the two-dimensional zonal wavenumber-frequency spectra that likely corresponds to the theoretically-expected <i>s</i> = 1 RG mode at heights of <i>z</i> = 30, 50, 65, and 80 km. The wave period of the spectral peak is approximately 1.3 days, which is close to one day. The <i>s</i> = 1 RG wave is successfully extracted using a band-pass filter after removing the diurnal tide with quite large amplitudes. The <i>s</i> = 1 RG wave exhibits a characteristic seasonal variation: the geopotential height (GPH) amplitudes are largest in the winter hemisphere in the stratosphere and lower mesosphere while enhancement is observed in both the winter and summer hemispheres in the upper mesosphere. Phase structures are examined in detail for a strong case. The horizontal phase structure at each height is consistent with the normal mode theory. The vertical phase structure is approximately barotropic from the lower stratosphere to the upper mesosphere at 30°N and 30°S where the amplitudes are large.</p>

DOI： 10.2151/jmsj.2024-029

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CiNii Research

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Publishing type：Research paper (scientific journal)  

DOI： 10.1029/2022JD038249

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