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In situ observations of dehydrated air parcels advected horizontally in the Tropical Tropopause Layer of the western Pacific

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/20010

Title: In situ observations of dehydrated air parcels advected horizontally in the Tropical Tropopause Layer of the western Pacific
Authors: Hasebe, F. Browse this author →KAKEN DB
Fujiwara, M. Browse this author
Nishi, N. Browse this author
Shiotani, M. Browse this author
Vömel, H. Browse this author
Oltmans, S. Browse this author
Takashima, H. Browse this author
Saraspriya, S. Browse this author
Komala, N. Browse this author
Inai, Y. Browse this author
Issue Date: 14-Feb-2007
Publisher: European Geosciences Union (EGU)
Journal Title: Atmospheric Chemistry and Physics
Volume: 7
Start Page: 803
End Page: 813
Abstract: Water vapor observations by chilled-mirror hygrometers were conducted at Bandung, Indonesia (6.90° S, 107.60° E) and Tarawa, Kiribati (1.35° N, 172.91° E) in December 2003 to examine the efficiency of dehydration during horizontal advection in the tropical tropopause layer (TTL). Trajectory analyses based on bundles of isentropic trajectories suggest that the modification of air parcels' identity due to irreversible mixing by the branching-out and merging-in of nearby trajectories is found to be an important factor, in addition to the routes air parcels follow, for interpreting the water vapor concentrations observed by chilled-mirror frostpoint hygrometers in the TTL. Clear correspondence between the observed water vapor concentration and the estimated temperature history of air parcels is found showing that drier air parcels were exposed to lower temperatures than were more humid ones during advection. Although the number of observations is quite limited, the water content in the observed air parcels on many occasions was more than that expected from the minimum saturation mixing ratio during horizontal advection prior to sonde observations.
Type: article (author version)
URI: http://hdl.handle.net/2115/20010
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: 長谷部 文雄

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