Japan Geoscience Union Meeting 2015

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International Session (Oral)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG09] Satellite Earth Environment Observation

Wed. May 27, 2015 9:00 AM - 10:45 AM 301B (3F)

Convener:*Riko Oki(Japan Aerospace Exploration Agency), Tadahiro Hayasaka(Graduate School of Science, Tohoku University), Kaoru Sato(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Masaki Satoh(Atmosphere and Ocean Research Institute, The University of Tokyo), Nobuhiro Takahashi(National Institute of Information and Communications Technology), Yoshiaki HONDA(Center for Environmental Remote Sensing, Chiba University), Kenlo Nasahara(Faculty of Life and Environmental Sciences, University of Tsukuba), Takashi Nakajima(Tokai University, School of Information Science & Technology, Dept. of Human & Information Science), Taikan Oki(Institute of Industrial Science, The University of Tokyo), Tatsuya Yokota(National Institute for Environmental Studies), Yukari Takayabu(Atmosphere and Ocean Research Institute, the University of Tokyo), Hiroshi Murakami(Earth Observation Research Center, Japan Aerospace Exploration Agency), Hajime Okamoto(Kyushu University), Chair:Takuji Kubota(Earth Observation Research Center,Japan Aerospace Exploration Agency)

10:00 AM - 10:15 AM

[ACG09-04] Simultaneous occurrence of polar stratospheric clouds and upper tropospheric clouds caused by blocking anticyclones

*Masashi KOHMA1, Kaoru SATO1 (1.The University of Tokyo)

Keywords:polar stratospheric clouds, blocking anticyclone, CALIPSO

Occurrence frequency and type of the polar stratospheric clouds (PSCs) are largely affected by atmospheric waves including planetary-scale waves, synoptic-scale waves and gravity waves. Recent studies indicated that PSCs and upper tropospheric clouds are frequently simultaneously observed. The present study statistically examined the simultaneous occurrence of the clouds which are dominant in two height regions and considered possible dynamical mechanisms. Using the 5-year CALIPSO observational data and reanalysis data over the Antarctic, it is shown that lower altitude clouds are dominant around the tropopause and the simultaneous occurrence are frequently observed in association with relatively large scale anticyclones including blocking highs in the troposphere. The composition of PSCs is investigated as a function of relative longitude to the anticyclone centers. It was revealed that relatively high proportion of PSCs containing nitric acid trihydrate (NAT) is distributed in the leeward side of anticyclones while proportion of non-depolarizing (liquid) PSCs is high on its windward side.