Japan Geoscience Union Meeting 2016

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Poster

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

[A-AS11] Stratosphere-troposphere Processes And their Role in Climate

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Yousuke Yamashita(National Institute for Environmental Studies), Hideharu Akiyoshi(National Institute for Environmental Studies), Kaoru Sato(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Yoshihiro Tomikawa(National Institute of Polar Research)

5:15 PM - 6:30 PM

[AAS11-P12] Un-volatile aerosol layer in the lower most stratosphere over tarawa, Kiribati, observed bu balloon norne Optical Particle Counter in january, 2016

*Masahiko Hayashi1, Naomi Eguchi1, Koichi Shiraishi1, Yoichi Inai2, Satoru Mimura2, Fumio Hasebe2, Takashi Shibata3 (1.Faculty of Science, Fukuoka University, 2.Hokkaido University, 3.Nagoya University)

Keywords:Tropical Tropopause Layer, stratsphere, aerosol, volatility

Size distributions and volatility of aerosols in the Tropical Tropopause Layer (TTL) over Tarawa (1.5 oS, 173.0 oE) were observed using balloon-borne dual optical particle counters (OPC) in January 2016. One OPC observed number concentration of ambient aerosols and another OPC observed aerosol size distribution denuded at 200 oC, in order to discuss volatility of aerosls.
Unusual aerosol layer was found in the stratosphere from 18 to 22 km in altitude. The layer was divided into two sub-layers. Upper layer was characterized by smaller high volatile aerosol, and lower one by mixture with larger submicron un-volatile aerosol. The feature was similar to fresh volcanic aerosol layer, however we did not find any report of large volcanic eruption in 2015. We will discuss about origin of the layer.