Consistency in XCO2 Retrievals from Sciamachy, Gosat and OCO-2 for Spatio-Temporal Characteristics at a Global Scale

Long-term XCO 2 retrievals, which are obtained by the three measurements including SCIAMACHY, GOSAT and OCO-2, are publicly available from 2003 to date. These XCO 2 data can help us better understanding the underlying processes of uptake and release of CO 2 in biosphere and anthropogenic emissions at global scales via probing into the characteristics of the spatio-temporal variations of XCO 2 . We investigated the inconsistency of the spatio-temporal variations of XCO 2 in these three measurements by combining with NDVI data. We apply a global land mapping XCO 2 datasets generated by data-driven spatiotemporal geostatistics method to the correlation analysis with NDVI. As a result, XCO 2 demonstrate smooth variations in time without jumping in the time node between the three measurements. They demonstrate similar patterns of correlation coefficients with NDVI which could indicate the process of CO 2 interchange in biosphere-atmosphere.