关键词: OCO-2, 高精度曲面建模, 2空间分布')">XCO₂空间分布, 空间插值, TCCON

Abstract:

In this study, high accuracy surface modeling (HASM) is used to simulate the spatial distribution of XCO₂ with high accuracy in a wild range of regions based on OCO-2 satellite's observations. Firstly, we discussed and analyzed the feasibility of HASM simulation of the spatial distribution of XCO₂ observed by OCO-2 satellite. For the OCO-2's XCO₂ from September 2014 to August 2015, 90% of each month's XCO₂ data were randomly selected as the input of spatial interpolation and the remaining 10% were used to verify the result of spatial interpolation.The results show that the mean absolute error of 12 months is 0.34 ppm. Therefore, HASM is suitable for simulating the spatial distribution of XCO₂ observed by OCO-2 satellite. Then we use HASM to simulate monthly XCO₂ distribution at the spatial resolution of 0.5°×0.5° based on OCO-2's observations from September 2014 to August 2015. Simultaneously, the corresponding TCCON (Total Carbon Column Observing Network) observations are used to verify HASM's simulations. The result shows that the mean absolute error between HASM simulations and TCCON observations is 0.81 ppm and the correlation coefficient between them is 0.88. Therefore, HASM has great advantages in simulating the spatial distribution of XCO₂ observed by OCO-2 satellite.

Key words: OCO-2, high accuracy surface modeling, 2')">spatial distribution of XCO₂, spatial interpolation, TCCON