Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 3 2007 10.5194/acp-7-803-2007 http://www.atmos-chem-phys.net/7/803/2007/ http://www.atmos-chem-phys.net/7/803/2007/acp-7-803-2007.html http://www.atmos-chem-phys.net/7/803/2007/acp-7-803-2007.pdf 803 813 2007-02-14 In situ observations of dehydrated air parcels advected horizontally in the Tropical Tropopause Layer of the western Pacific F. Hasebe f-hasebe@ees.hokudai.ac.jp M. Fujiwara N. Nishi M. Shiotani H. Vömel S. Oltmans H. Takashima S. Saraspriya N. Komala Y. Inai Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan Geophysical Institute, Kyoto University, Kyoto, Japan Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan CRES, University of Colorado, Boulder, CO, USA Climate Monitoring and Diagnostics Laboratory, NOAA, Boulder, CO, USA Lembaga Penerbangan dan Antariksa Nasional, Bandung, Indonesia Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan 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). 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