Greenhouse gases Observing SATellite 2 (GOSAT-2): mission overview

Progress in Earth and Planetary Science

Review

Chong Shi¹  Ryoichi Imasu²  Naoko Saitoh³  Makiko Hashimoto⁴  Teruyuki Nakajima⁴  Masakatsu Nakajima⁴  Kei Shiomi⁴  Haruma Ishida⁵  Yu Someya⁶  Isamu Morino⁶  Yosuke Niwa⁶  Shamil Maksyutov⁶  Yukio Yoshida⁶  Tsuneo Matsunaga⁶  Hibiki Noda⁶  Osamu Uchino⁶  Hiroshi Takagi⁶  Yu Oishi⁷  Kouki Hikosaka⁸  Takashi Y. Nakajima⁹ 

[1] Aerospace Information Research Institute, Chinese Academy of Sciences, No.9 Dengzhuang South Road, Haidian District, 100094, Beijing, China;Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, 277-8568, Kashiwa, Chiba, Japan;Center for Environmental Remote Sensing (CEReS), Chiba University, 1-33 Yayoi-Cho, Inage-Ku, 263-8522, Chiba-Shi, Chiba, Japan;Japan Aerospace Exploration Agency, 2-1-1 Sengen, 305-8505, Tsukuba, Ibaraki, Japan;Meteorological Research Institute, Japan Meteorological Agency, 1-1 Nagamine, 305-0052, Tsukuba, Ibaraki, Japan;National Institute for Environmental Studies, 16-2 Onogawa, 305-8506, Tsukuba, Ibaraki, Japan;National Institute for Environmental Studies, 16-2 Onogawa, 305-8506, Tsukuba, Ibaraki, Japan;Research Center for Agricultural Information Technology, The National Agriculture and Food Research Organization, 1-31-1 Kannondai, 305-0856, Tsukuba, Ibaraki, Japan;Tohoku University, 980-8578, Aoba, Sendai, Miyagi, Japan;Tokai University, 2-28-4 Tomigaya, 151-8677, Shibuya, Tokyo, Japan;

关键词: GOSAT-2;    GOSAT;    Carbon dioxide;    Methane;    Carbon monoxide;    Black carbon;    Solar-induced chlorophyll fluorescence;    TANSO-FTS-2;    TANSO-CAI-2;    Intelligent pointing mechanism;   

DOI  :  10.1186/s40645-023-00562-2

 received in 2022-11-11, accepted in 2023-06-06,  发布年份 2023

来源: Springer

【 摘 要 】

The Greenhouse gases Observing SATellite 2 (GOSAT-2) was launched in October 2018 as a successor to GOSAT (launched in 2009), the first satellite to specialize in greenhouse gas observations. Compared to the GOSAT sensors, the sensors of GOSAT-2 offer higher performance in most respects. The quality and quantity of data from observations are expected to be improved accordingly. The signal-to-noise ratio (SNR) is better in both the SWIR and TIR bands of TANSO-FTS-2, which is the main sensor of GOSAT-2. This improvement ultimately enhances the accuracy of greenhouse gas concentration analysis. Furthermore, because of the improved SNR in the SWIR band, the northern limit at which data are obtainable in high-latitude regions of the Northern Hemisphere in winter, where observation data have remained unavailable because of weak signal strength, has moved to higher latitudes. As better data are obtained in greater quantities, progress in carbon cycle research for high-latitude regions is anticipated. Moreover, the improvement of SNR in the TIR band is expected to be considerable. Particularly, the resolutions of the vertical concentration distributions of CO2 and CH4 have been improved drastically. The first function introduced for GOSAT-2 that is not in GOSAT is an intelligent pointing mechanism: a cloud area avoidance function using the in-field camera of TANSO-FTS-2. This function can increase the amounts of observation data globally and can improve the accuracy of CO2 emissions estimation and measurements of uptake intensity. The effects are expected to be strong, especially for the tropics because cumulus clouds are the most common cloud type. The intelligent pointing system can avoid the clouds effectively. Another important benefit of TANSO-FTS-2 is that the wavelength range of Band 3 of SWIR has been expanded for measuring carbon monoxide (CO). Because CO originates from combustion, it is used to evaluate some effects of human activities in urban areas and biomass burning in fields. Particularly, black carbon-type aerosols can be measured by the sub-sensor, TANSO-CAI-2, to assess biomass burning along with CO2 and CO by TANSO-FTS-2.

【 授权许可】

CC BY   
© The Author(s) 2023. corrected publication 2023

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