HR: 0800h
AN: A21E-0784    [Abstracts]
TI: Upper Tropospheric Water Vapor Variation Over Asian Monsoon During Northern Summer 2007
AU: * Eguchi, N
EM: eguchi.nawo@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: Kiguchi, M
EM: kiguchi@rainbow.iis.u-tokyo.ac.jp
AF: University of Tokyo, 4-6-1 Komaba, Meguro, 153-8505, Japan
AU: Murata, F
EM: fumie@kochi-u.ac.jp
AF: Kochi University, 2-5-1 Akebono-cho, Kochi, 780-8520, Japan
AU: Yamane, Y
EM: yyamane@s06.mbox.media.kyoto-u.ac.jp
AF: Kyoto University, Gokasho, Uji, 611-0011, Japan
AU: Terao, T
EM: terao@ed.kagawa-u.ac.jp
AF: Kagawa University, 1-1 Saiwai-cyo, Takamatsu, 760-8522, Japan
AU: Hayashi, T
EM: hayashi@rcde.dpri.kyoto-u.ac.jp
AF: Kyoto University, Gokasho, Uji, 611-0011, Japan
AU: Karmakar, S
AF: Bangladesh Meteorological Department, Abhawa Bhaban Agargaon, Dhaka, 1207, Bangladesh
AB: The observation of water vapor by the balloon-borne hygrometer, Snow White (hereafter SW; purchased from Meteolabor Inc.), was conducted at the Bangladesh Meteorological Department in Dhaka (90.23°E, 23.43°N, 9mSL) from March to July of 2007 in order to quantitatively investigate the upper tropospheric water vapor variation during the Asian summer monsoon. The six and four radiosondes (Vaisala RS80 and RS92) with SWs were launched in the pre-monsoon (March-May) and monsoon (June-July) periods, respectively. The launch time was approximately 12:30 LST. The upper tropospheric water vapor data for quantitative discussion was obtained by all of the radiosonde measurements except for two. The averages of tropopause temperature and humidity in the pre-monsoon period were higher (~ 1 K) and moister (~ 2 ppmv) than those in the monsoon period because the active convections occurred more frequently during the pre-monsoon period. During the middle of pre-monsoon period when the westerly jet moved southward to Bangladesh, the middle and upper tropospheres were quite dry (< 20 %) and the convections were suppressed. In conclusions, the upper tropospheric water vapor is closely related to the activities of localized convections and westerly jet which is a north part of monsoon circulation, especially during the pre- monsoon period. In the presentation, the comparisons of observational data from SW, H-Humicap from RS80 and RS92 and satellite observations (EOS MLS and AIRS) and the water vapor variation over the Asian monsoon region inferred from the satellite observations will also be discussed.
DE: 3329 Mesoscale meteorology
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3362 Stratosphere/troposphere interactions
DE: 3364 Synoptic-scale meteorology
DE: 3394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting