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Altitude misestimation caused by the Vaisala RS80 pressure bias and its impact on meteorological profiles


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タイトル: Altitude misestimation caused by the Vaisala RS80 pressure bias and its impact on meteorological profiles
著者: Inai, Y. 著作を一覧する
Shiotani, M. 著作を一覧する
Fujiwara, M. 著作を一覧する
Hasebe, F. 著作を一覧する
Vömel, H. 著作を一覧する
発行日: 2015年
出版者: European Geosciences Union(EGU)
誌名: Atmospheric Measurement Techniques
巻: 8
号: 10
開始ページ: 4043
終了ページ: 4054
出版社 DOI: 10.5194/amt-8-4043-2015
抄録: Previous research has found that conventional radiosondes equipped with a traditional pressure sensor can be subject to a pressure bias, particularly in the stratosphere. This study examines this pressure bias and the resulting altitude misestimation, and its impact on temperature, ozone, and water vapor profiles is considered using data obtained between December 2003 and January 2010 during the Soundings of Ozone andWater in the Equatorial Region (SOWER) campaigns. The payload consisted of a radiosonde (Vaisala RS80), ozone and water vapor sondes, and a global positioning system (GPS) sensor. More than 30 soundings are used in this study. As GPS height data are thought to be highly accurate, they can be used to calculate pressure. The RS80 pressure bias in the tropical stratosphere is estimated to be 􀀀0:4 0:2 hPa (1 ) between 20 and 30 km. As this pressure bias is negative throughout the stratosphere, it leads to systematic overestimation of geopotential height by 43 23, 110 40, and 240 92m (1 ) at 20, 25, and 30 km, respectively when it is calculated by using the hypsometric equation. Because of the altitude overestimation, we see some offsets in observation parameters having a vertical gradient such as temperature, ozone, and water vapor. Those offsets in the meteorological soundings obtained using the RS80 may have generated an artificial trend in the meteorological records when radiosondes were changed from the RS80, which had no GPS unit, to the new ones with a GPS unit. Therefore, it is important to take those offsets into account in climate change studies.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 藤原 正智


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