Correlation between equatorial Kelvin waves and the occurrence of extremely thin ice clouds at the tropical tropopause

Immler, F.; Krüger, K.; Fujiwara, M.; Verver, G.; Rex, M.; Schrems, O.

doi:10.5194/acp-8-4019-2008


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Correlation between equatorial Kelvin waves and the occurrence of extremely thin ice clouds at the tropical tropopause

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Title:	Correlation between equatorial Kelvin waves and the occurrence of extremely thin ice clouds at the tropical tropopause
Authors:	Immler, F. Browse this author
	Krüger, K. Browse this author
	Fujiwara, M. Browse this author →KAKEN DB
	Verver, G. Browse this author
	Rex, M. Browse this author
	Schrems, O. Browse this author
Issue Date:	2008
Publisher:	Copernicus Publications on behalf of the European Geosciences Union (EGU)
Journal Title:	Atmospheric Chemistry and Physics
Volume:	8
Issue:	14
Start Page:	4019
End Page:	4026
Publisher DOI:	10.5194/acp-8-4019-2008
Abstract:	A number of field-campaigns in the tropics have been conducted in recent years with two different LIDAR systems at Paramaribo (5.8 N, 55.2 W), Suriname. The lidars detect particles in the atmosphere with high vertical and temporal resolution and are capable of detecting extremely thin cloud layers which frequently occur in the tropical tropopause layer (TTL). Radiosonde as well as operational ECMWF analysis showed that equatorial Kelvin waves propagated in the TTL and greatly modulated its temperature structure. We found a clear correlation between the temperature anomalies introduced by these waves and the occurrence of thin cirrus in the TTL. In particular we found that extremely thin ice clouds form regularly where cold anomalies shift the tropopause to high altitudes. These findings suggest an influence of Kelvin wave activity on the dehydration in the TTL and thus on the global stratospheric water vapour concentration.
Rights:	http://creativecommons.org/licenses/by/3.0/
Type:	article
URI:	http://hdl.handle.net/2115/64817
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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