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

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Title: Seasonal to decadal variations of water vapor in the tropical lower stratosphere observed with balloon-borne cryogenic frost point hygrometers
Authors: Fujiwara, M. Browse this author
Vömel, H. Browse this author
Hasebe, F. Browse this author
Shiotani, M. Browse this author
Ogino, S.-Y. Browse this author
Iwasaki, S. Browse this author
Nishi, N. Browse this author
Shibata, T. Browse this author
Shimizu, K. Browse this author
Nishimoto, E. Browse this author
Valverde Canossa, J. M. Browse this author
Selkirk, H. B. Browse this author
Oltmans, S. J. Browse this author
Issue Date: 21-Sep-2010
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research, Atmospheres
Volume: 115
Start Page: D18304
Publisher DOI: 10.1029/2010JD014179
Abstract: 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.
Rights: Copyright 2010 by the American Geophysical Union
Type: article
URI: http://hdl.handle.net/2115/44971
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤原 正智

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