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

Thu. May 28, 2015 2:15 PM - 4:00 PM 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:Hiroshi Murakami(Earth Observation Research Center, Japan Aerospace Exploration Agency)

2:45 PM - 3:15 PM

★ [ACG09-28] Six-year-long GHG observation by GOSAT and three-year carbon flux estimation

*Tatsuya YOKOTA1, Nobuhiro KIKUCHI1, Yukio YOSHIDA1, Makoto INOUE1, Isamu MORINO1, Osamu UCHINO1, Heon-sook KIM1, Hiroshi TAKAGI1, Makoto SAITO1, Shamil Maksyutov1, Fumie KAWAZOE1, Masataka AJIRO1 (1.CGER, National Institute for Environmental Studies)

Keywords:greenhouse gases, carbon dioxide, methane, column concentration, flux, GOSAT

The Greenhouse gases Observing SATellite (GOSAT) has operated for about six years since January 23, 2009. During the past six years, all of the GOSAT standard data products were opened to general users, and many of them went through several updates. From the spectral data that GOSAT collected, the concentrations of major greenhouse gases (GHGs), namely carbon dioxide (CO2) and methane (CH4), were retrieved, and their precisions (excluding biases) are now about 0.5% and 0.7%, respectively. These concentration data were used to estimate the monthly surface fluxes of CO2 and CH4 on sub-continental and ocean-basin scales in the first three years of GOSAT operation (2009 - 2012). The concentration data were also utilized to monitor GHGs' temporal and spatial changes. Various reports on the results of GOSAT data analysis have appeared in peer-reviewed journals so far.

In 2014, GOSAT went through some technical difficulties in the functioning of its solar paddle and sensor pointing mechanism, and the characteristics of the Fourier transform spectrometer onboard were therefore altered to some degree. The influence of this alteration on the retrieved concentrations has been detected.

In this presentation, we will summarize the six-year-long GHG observation by GOSAT and present the global distributions and variations of the GHG concentrations and the surface flux estimates. We will explain the changes in the characteristics of the GOSAT data products after June 2014 owing to the influence of the technical difficulties. Also, we will touch on the current status of researches conducted within the framework of the GOSAT Research Announcement.