The seasonal variation of the CO2 flux over Tropical Asia estimated from GOSAT, CONTRAIL and IASI
Résumé
We estimate the CO2 flux over Tropical Asia in 2009, 2010 and 2011 using GOSAT total column CO2 (XCO2) and in situ measurements of CO2. Compared to flux estimates from assimilating surface measurements of CO2, GOSAT XCO2 estimates a more dynamic seasonal cycle and a large source in March - May 2010. The more dynamic seasonal cycle is consistent with earlier work by Patra et al. [2011], and the enhanced 2010 source is supported by independent upper air CO2 measurements from the CONTRAIL project. Using IASI measurements of total column CO (XCO), we show that biomass burning CO2 can explain neither the dynamic seasonal cycle nor the 2010 source. We conclude that both features must come from the terrestrial biosphere. In particular the 2010 source points to biosphere response to above-average temperatures that year.
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