Japan Geoscience Union Meeting 2014

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

[A-AS22_1AM2] Atmospheric Chemistry

Thu. May 1, 2014 11:00 AM - 12:45 PM 511 (5F)

Convener:*Nobuyuki Takegawa(Research Center for Advanced Science and Technology, University of Tokyo), Yousuke Sawa(Geochemical Research Department, Meteorological Research Institute), Yugo Kanaya(Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology), Kenshi Takahashi(Research Institute for Sustainable Humanosphere, Kyoto University), Hiroshi Tanimoto(National Institute for Environmental Studies), Chair:Kazuhiro Tsuboi(Oceanography and Geochemistry Research Department,Meteorological Research Institute)

12:15 PM - 12:30 PM

[AAS22-20] Seasonal changes of greenhouse gases in the upper troposphere/lower stratosphere observed by commercial airliner

*Yousuke SAWA1, Toshinobu MACHIDA2, Hidekazu MATSUEDA1, Yosuke NIWA1, Kazuhiro TSUBOI1, Shohei MURAYAMA3, Shinji MORIMOTO4, Shuji AOKI4 (1.Meteorological Research Institute, 2.National Institute for Enviromental Studies, 3.National Institute of Advanced Industrial Science and Technology, 4.Tohoku University)

Keywords:Atmospheric Chemistry, Greenhouse Gas, Upper Troposphere/Lower Stratosphere

Atmospheric mixing ratios of greenhouse gases at about 11 km altitude were analyzed from monthly air sampling aboard commercial airliner during the flights between Europe and Japan from April 2012 to August 2013. Compared to the subtropic, higher CH4 and SF6 mixing ratios, similar values of N2O, and larger seasonal changes of CO2 were found in the upper troposphere. CH4, N2O and SF6 in the lower stratosphere, above the tropopause up to 30 K in potential temperature, showed simultaneous increases from June to October, and faster decreases at higher altitudes from January to March. Mean age of the air in the lower stratosphere was estimated based on SF6 mixing ratios to be about 2 years in late spring and 1 year in autumn, suggesting stronger influences on the mixing ratios in the stratosphere from troposphere in summer.