Japan Geoscience Union Meeting 2014

Presentation information

Oral

Symbol A (Atmospheric, Ocean, and Environmental Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS21_30AM1] Stratospheric Processes And their Role in Climate

Wed. Apr 30, 2014 9:00 AM - 10:45 AM 313 (3F)

Convener:*Kazuyuki Miyazaki(Research Institute for Global Change, JAMSTEC), Masakazu Taguchi(Aichi University of Education), Yoshio Kawatani(Japan Agency for Marine-Earth Science and Technology), Kaoru Sato(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Chair:Yoshio Kawatani(Japan Agency for Marine-Earth Science and Technology)

10:30 AM - 10:45 AM

[AAS21-P02_PG] Balloon-borne observations of lower stratospheric water vapor at the Antarctic Syowa Station

3-min talk in an oral session

*Yoshihiro TOMIKAWA1, Kaoru SATO2, Masaki TSUTSUMI1, Takuji NAKAMURA1, Naohiko HIRASAWA1 (1.National Institute of Polar Research, 2.The University of Tokyo)

Keywords:water vapor, sonde, Antarctic, lower stratosphere

A variation of water vapor in the lower stratosphere has a large radiative forcing. It is considered that increase and decrease of lower stratospheric water vapor before and after 2000, respectively, altered the surface temperature trend by up to 30% in each period. However, since the water vapor content abruptly changes with height around the tropopause, it is hard to capture its variation exactly by satellite observations with a low vertical resolution. Many in-situ (i.e., balloon-borne and aircraft) observations with a high vertical resolution have been performed in low and middle latitudes, but few in the polar region. At the Antarctic Syowa Station (69.0S, 39.6E), three balloon-borne cryogenic frost-point hygrometer observations were performed in 2013 by the 54th Japanese Antarctic Research Expedition (JARE54), so that high precision and high vertical resolution data up to about a 25km altitude were obtained successfully. In this paper, a preliminary result of these observations is presented, and it will be discussed how important it is to continue the water vapor observation at Syowa Station.