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<p>The recently released JAGUAR-DAS Whole Neutral Atmosphere Reanalysis (JAWARA), produced using the Japanese Atmospheric General circulation model for the Upper Atmosphere Research-Data Assimilation System, covers the height region from the surface to ~ 110&#xa0;km (lower thermosphere). In this study, JAWARA zonal winds in the 25–62&#xa0;km height region are evaluated with more than 200 vertical profiles of independent Rohini 200 (RH200) sounding rocket observations from a low latitude site Thumba (8.5⁰N, 76.9⁰E). An appreciable agreement is found between JAWARA and RH200 zonal winds, with correlation coefficients better than 0.8 for coincident vertical profiles. A slight westerly bias (absolute magnitude &lt; 3&#xa0;m/s) in 25–40&#xa0;km and a moderate easterly bias (absolute magnitude &lt; 5.5&#xa0;m/s) above 40&#xa0;km is observed for the JAWARA dataset in comparison to RH200 measurements. A comparison of daily vertical profiles of zonal winds over Thumba obtained from RH200 observations during 20–30 January 2006 with the corresponding JAWARA profiles revealed that the JAWARA dataset very effectively reproduced the tropical zonal wind response of the northern hemispheric Sudden Stratospheric Warming event of January 2006. Representation of the annual cycle of zonal winds in JAWARA lacks the presence of westerlies in the tropical lower mesosphere above 60&#xa0;km during summer solstice, a feature commonly observed in reanalyses. However, the annual cycle of zonal winds in JAWARA shows a better agreement with RH200 observations in comparison to Modern Era Retrospective analysis for Research and Applications version2 (MERRA2) data. While MERRA2 underestimates the amplitude of the semiannual oscillation (SAO), the JAWARA dataset shows an overestimation.</p> Graphical Abstract <p></p>

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Validation of JAGUAR-DAS Whole Neutral Atmosphere Reanalysis (JAWARA) zonal winds with independent sounding rocket observations over a tropical site

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  • 发表日期：

    2026年4月2日

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  • N. Koushik,
  • K. Kishore Kumar

摘要

The recently released JAGUAR-DAS Whole Neutral Atmosphere Reanalysis (JAWARA), produced using the Japanese Atmospheric General circulation model for the Upper Atmosphere Research-Data Assimilation System, covers the height region from the surface to ~ 110 km (lower thermosphere). In this study, JAWARA zonal winds in the 25–62 km height region are evaluated with more than 200 vertical profiles of independent Rohini 200 (RH200) sounding rocket observations from a low latitude site Thumba (8.5⁰N, 76.9⁰E). An appreciable agreement is found between JAWARA and RH200 zonal winds, with correlation coefficients better than 0.8 for coincident vertical profiles. A slight westerly bias (absolute magnitude < 3 m/s) in 25–40 km and a moderate easterly bias (absolute magnitude < 5.5 m/s) above 40 km is observed for the JAWARA dataset in comparison to RH200 measurements. A comparison of daily vertical profiles of zonal winds over Thumba obtained from RH200 observations during 20–30 January 2006 with the corresponding JAWARA profiles revealed that the JAWARA dataset very effectively reproduced the tropical zonal wind response of the northern hemispheric Sudden Stratospheric Warming event of January 2006. Representation of the annual cycle of zonal winds in JAWARA lacks the presence of westerlies in the tropical lower mesosphere above 60 km during summer solstice, a feature commonly observed in reanalyses. However, the annual cycle of zonal winds in JAWARA shows a better agreement with RH200 observations in comparison to Modern Era Retrospective analysis for Research and Applications version2 (MERRA2) data. While MERRA2 underestimates the amplitude of the semiannual oscillation (SAO), the JAWARA dataset shows an overestimation.

Graphical Abstract