So far, the Greenhouse Gases Observing Satellite (GOSAT) and the Orbiting Carbon Observatory-2 (OCO-2) are the only two missions designed to measure the column-averaged CO 2  dry air mole fraction (XCO 2 ). To improve our understanding of global carbon source and sink, these two XCO 2  products are compared in this study. The result reveals that the OCO-2 XCO 2  product show the wider spatial coverage than those of GOSAT from 30°S ∼ 90°N latitude. At the same time, GOSAT and OCO-2 XCO 2  products shows a good agreement with correlation coefficient (R 2 ) of 0.69 and bias of −1.0 ppm. However, the discrepancy is still existed in some region. The discrepancy between these two products implies that it is necessary to make them complement each other to better improve our knowledge of global carbon cycle or even climate change.
['Yingying Jing', 'Jiancheng Shi', 'Peng Zhang', 'Tianxing Wang', 'Lin Chen']
Comparison of atmospheric carbon dioxide concentration based on GOSAT and OCO-2 observations