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Seasonal to Decadal Variations of Water Vapor in the Tropical Lower Stratosphere Observed with Balloon-Borne Cryogenic Frost Point HygrometersWe 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 (10degN) 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.
Document ID
20110007974
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Fujiwara, M.
(Hokkaido Univ. Sapporo, Japan)
Voemel, H.
(Meteorologisches Observatorium Lindenberg, Germany)
Hasebe, F.
(Hokkaido Univ. Sapporo, Japan)
Shiotani, M.
(Kyoto Univ. Uji, Japan)
Ogino, S.-Y.
(Japan Agency for Marine-Earth Science and Technology Yokosuka, Japan)
Iwasaki, S.
(National Defense Academy Yokosuka, Japan)
Nishi, N.
(Kyoto Univ. Kyoto, Japan)
Shibata, T.
(Nagoya Univ. Nagoya, Japan)
Shimizu, K.
(Hokkaido Univ. Sapporo, Japan)
Nishimoto, E.
(Kyoto Univ. Uji, Japan)
ValverdeCanossa, J. M.
(Universidad Nacional Heredia, Costa Rica)
Selkirk, H. B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Oltmans, S. J.
(National Oceanic and Atmospheric Administration Boulder, CO, United States)
Date Acquired
August 25, 2013
Publication Date
September 1, 2010
Publication Information
Publication: Journal of Geophysical Research - Atmospheres
Volume: 115
ISSN: 0148-0227
Subject Category
Meteorology And Climatology
Funding Number(s)
CONTRACT_GRANT: MEXT 11219201
CONTRACT_GRANT: MEXT 19740283
CONTRACT_GRANT: MEXT 15204043
CONTRACT_GRANT: MEXT 18204041
CONTRACT_GRANT: MEXT 10041103
Distribution Limits
Public
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