Japan Geoscience Union Meeting 2015

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

[A-AS21] Atmospheric Chemistry

Thu. May 28, 2015 11:00 AM - 12:45 PM 201B (2F)

Convener:*Yousuke Sawa(Oceanography and Geochemistry Research Department, Meteorological Research Institute), Nobuyuki Takegawa(Graduate School of Science and Engineering, Tokyo Metropolitan University), 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:Motoki Sasakawa(National Institute for Environmental Studies)

11:45 AM - 12:00 PM

[AAS21-16] Temporal variation of methane profile observed with FTIR at Tsukuba

*Isao MURATA1, Hideaki NAKAJIMA2, Isamu MORINO3 (1.Graduate School of Environmental Studies, Tohoku University, 2.Council for Science, Technology and Innovation, Cabinet Office, Government of Japan, 3.National Institute for Environmental Studies)

Keywords:FTIR, Greenhouse Gas, Methane

The vertical profiles of CH4 have been observed with high-resolution Fourier transform spectrometer at Tsukuba, Japan since 2001. SFIT2 spectral fitting program was used to derive the vertical profiles from 3 spectral regions in 3 micrometer region.
CH4 is the second important contributor of the anthropogenically enhanced greenhouse effect but there are many uncertainties in the source variations.
Daily averaged CH4 total column density kept a level from 2001 to 2006, then increased from 2007 to 2008, and again kept a level from 2009 to 2014. Tropopause height shows no significant change between before and after 2007, indicating stable dynamical situation. Derived CH4 profiles show that the increase occurred mainly in the troposphere.