Potential ability for joint-use of CO2 measurements retrieved from different remotely sensed data

Remote sensing of atmospheric CO₂ is essential to study global warming. To date, there are many instruments to detect CO₂ from space, such as, AIRS, GOSAT, SCIAMACHY and IASI etc., while quantification of the differences among these CO₂ products has not been fully investigated yet. In this study, the differences between CO₂ products from AIRS, GOSAT, SCIAMAMCHY (totally four products) have been compared. The results showed that although these CO₂ products are derived from different instruments, the complementarity in spatial coverage and relatively high correlation among them make it potentially possible to combine them, especially for GOSAT and SCIAMACHY.