Seasonal to decadal variations of water vapor in the tropical lower stratosphere observed with balloon-borne cryogenic frost point hygrometers

Fujiwara, M.; Vömel, H.; Hasebe, F.; Shiotani, M.; Ogino, S.-Y.; Iwasaki, S.; Nishi, N.; Shibata, T.; Shimizu, K.; Nishimoto, E.; Valverde Canossa, J. M.; Selkirk, H. B.; Oltmans, S. J.

Seasonal to decadal variations of water vapor in the tropical lower stratosphere observed with balloon-borne cryogenic frost point hygrometers

Fujiwara, M.; Vömel, H.; Hasebe, F. et al.

Journal of Geophysical Research, Atmospheres, 2010, 115, D18304

Permalink : https://hdl.handle.net/2115/44971

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アクセス権	open access
URI	https://hdl.handle.net/2115/44971
タイトル	Seasonal to decadal variations of water vapor in the tropical lower stratosphere observed with balloon-borne cryogenic frost point hygrometers
著者	Fujiwara, M. ; Vömel, H. ; Hasebe, F. ; Shiotani, M. ; Ogino, S.-Y. ; Iwasaki, S. ; Nishi, N. ; Shibata, T. ; Shimizu, K. ; Nishimoto, E. ; Valverde Canossa, J. M. ; Selkirk, H. B. ; Oltmans, S. J.
著者名 Fujiwara, M.
著者名 Vömel, H.
著者名 Hasebe, F.
著者名 Shiotani, M.
著者名 Ogino, S.-Y.
著者名 Iwasaki, S.
著者名 Nishi, N.
著者名 Shibata, T.
著者名 Shimizu, K.
著者名 Nishimoto, E.
著者名 Valverde Canossa, J. M.
著者名 Selkirk, H. B.
著者名 Oltmans, S. J.
言語	英語
発行日	2010-09-21
出版者	American Geophysical Union
収録物名	Journal of Geophysical Research, Atmospheres
巻(号)	115
ページ	D18304
抄録	We investigated water vapor variations in the tropical lower stratosphere on seasonal, quasi-biennial oscillation (QBO), and decadal time scales using balloon-borne cryogenic frost point hygrometer data taken between 1993 and 2009 during various campaigns including the Central Equatorial Pacific Experiment (March 1993), campaigns once or twice annually during the Soundings of Ozone and Water in the Equatorial Region (SOWER) project in the eastern Pacific (1998-2003) and in the western Pacific and Southeast Asia (2001-2009), and the Ticosonde campaigns and regular sounding at Costa Rica (2005-2009). Quasi-regular sounding data taken at Costa Rica clearly show the tape recorder signal. The observed ascent rates agree well with the ones from the Halogen Occultation Experiment (HALOE) satellite sensor. Average profiles from the recent five SOWER campaigns in the equatorial western Pacific in northern winter and from the three Ticosonde campaigns at Costa Rica (10°N) in northern summer clearly show two effects of the QBO. One is the vertical displacement of water vapor profiles associated with the QBO meridional circulation anomalies, and the other is the concentration variations associated with the QBO tropopause temperature variations. Time series of cryogenic frost point hygrometer data averaged in a lower stratospheric layer together with HALOE and Aura Microwave Limb Sounder data show the existence of decadal variations: The mixing ratios were higher and increasing in the 1990s, lower in the early 2000s, and probably slightly higher again or recovering after 2004. Thus linear trend analysis is not appropriate to investigate the behavior of the tropical lower stratospheric water vapor.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Copyright 2010 by the American Geophysical Union
PISSN	0148-0227
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1029/2010JD014179