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Present status of data processing and validation of Greenhouse gases Observing SATellite (GOSAT)

Tatsuya Yokota(1), Hiroshi Watanabe(1), Osamu Uchino(1), Isamu Morino(1), Yukio Yoshida(1) and Shamil Maksyutov(1)

(1) National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan

Abstract

The Greenhouse gases Observing SATellite (GOSAT) was launched on January 23, 2009 to monitor global CO2 and CH4 from space. The GOSAT project is a joint effort of the Ministry of the Environment (MOE), the National Institute for Environmental Studies (NIES), and the Japan Aerospace Exploration Agency (JAXA). Data acquired by GOSAT sensors, Thermal And Near infrared Sensor for carbon Observation-Fourier Transform Spectrometer (TANSO-FTS) and TANSO-Cloud an Aerosol Imager (TANSO-CAI), are transferred to JAXA’s Tsukuba Space Center, where Level 1 data (interferogram and spectra of FTS and uncorrected data of CAI) are generated. Then, Level 1 data are transferred to NIES GOSAT Data Handling Facility (DHF) for Level 1B (geometric and radiometric correction for CAI), Level 2 (CO2 and CH4 concentrations for FTS and cloud and aerosol properties for CAI), and for further higher-level processing. Also, NIES is in charge of developing the data processing algorithms, validating data quality, and storing/distributing GOSAT data products. We present the current status of routine data processing at the NIES GOSAT DHF. As for the data validation, the column abundances or column averaged volume mixing ratios of CO2 and CH4 (Level 2 data) will be validated by utilizing the ground-based FTS network (Total Carbon Column Network: TCCON) data collected at worldwide observation sites in Tsukuba (Japan), Darwin (Australia), Lauder (New Zealand), Bremen (Germany), Park Falls (USA), and others. Validation data preparation and situation are presented. The second Research Announcement (RA) has been released on April 7, 2009 to researchers worldwide, and research proposals will have been selected by the GOSAT RA selection and evaluation committee and approved by JAXA, NIES, and MOE by the end of July or August. Status of the 2nd GOSAT RA selection is also introduced at this conference.