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Water vapor control at the tropopause by equatorial Kelvin waves observed over the Galápagos

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Title: Water vapor control at the tropopause by equatorial Kelvin waves observed over the Galápagos
Authors: Fujiwara, M. Browse this author →KAKEN DB
Hasebe, F. Browse this author
Shiotani, M. Browse this author
Nishi, N. Browse this author
Vömel, H. Browse this author
Oltmans, S. J. Browse this author
Issue Date: 15-Aug-2001
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 28
Issue: 16
Start Page: 3143
End Page: 3146
Publisher DOI: 10.1029/2001GL013310
Abstract: Soundings of frost-point hygrometers, ozoneson- des, and radiosondes at San Cristdbal Island (0.9øS, 89.6øW) in September 1998 provide an observational evidence that equatorial Kelvin waves around the tropopause act as a de- hydration pump for the stratosphere. During the downward- displacement phase of a Kelvin wave, dry and ozone-rich stratospheric air is transported into the upper troposphere. During the upward-displacement phase, on the other hand, higher specific-humidity air moves up in the tropopause re- gion, but at the same time, this upward motion causes cool- ing of the air that limits the water vapor amount entering the stratosphere. Also, wave breaking contributes to the irreversible transport of ozone across the tropopause. Con- sidering their omnipresence at the equatorial tropopause, we suggest that Kelvin waves may be one of the impor- tant agents for maintaining the dryness of the tropical lower stratosphere
Rights: An edited version of this paper was published by AGU. Copyright 2001 American Geophysical Union. Fujiwara, M.,Hasebe, F.,Shiotani, M., Nishi, N., Vömel, H., Oltmans, S. J., 2001, Water vapor control at the tropopause by equatorial Kelvin waves observed over the Galápagos, Geophysical Research Letters, 28(16), 3143-3146, 10.1029/2001GL013310. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Type: article
URI: http://hdl.handle.net/2115/64865
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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