Comparison analysis of methane column concentrations (XCH4) between GOSAT and TROPOMI
CAO Yu1,2, LI Ru-ren1, ZHANG Hui-fang2, LI Hui-ya3, FANG Jun-jun2, CHEN Bao-zhang2,4,5
1. School of Transportation and Geomatics Engineering, Shenyang Jianzhu University, Shenyang 110168, China; 2. State Key Laboratory of Geographic Information Science and Technology, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 3. Shenzhen Ecological Environment Monitoring Center Station of Guangdong Province, Shenzhen 518049, China; 4. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China; 5. Jiangsu Collaborative Innovation Center for Geographic Information Resources and Development and Utilization, Nanjing 210023, China
Abstract：As one of the major greenhouse gases in the atmosphere, the spatial distribution characteristics of Methane (CH4) were the main content of climate research. However, differences were observed between the methane column concentration (XCH4) data from multiple satellite sources. A systematic evaluation of these differences was conducted to improve the accuracy of its scientific application. The XCH4 products obtained by the Greenhouse Gases Observing Satellite (GOSAT) and the Tropospheric Monitoring Instrument (TROPOMI) from March 2019 to February 2023 were compared and analyzed, and the Total Carbon Column Observing Network (TCCON) data were used for evaluation. The results showed that the two satellites shared the following common characteristics: XCH4 was higher near the equator and decreased towards the poles, with XCH4 values in the northern hemisphere generally being higher than those in the southern hemisphere; In the interannual variation, the fluctuation range in the southern hemisphere was larger, reaching ±15×10-9; Seasonal variation was characterized by lower values in summer and higher values in winter. The differences were as follows: The data volume of TROPOMI was found to be 1300 times greater than that of GOSAT; The annual average growth rates of GOSAT in North America and Africa (13.08×10-9/a and 13.92×10-9/a) were slightly lower than those of TROPOMI (13.34×10-9/a and 14.12×10-9/a), while the interannual amplitude in South America (16.10×10-9/a) was found to be larger. The XCH4 difference between the two satellites in summer was found to be the largest, with a measurement of -5.00×10-9.
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