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09/16/2013

Global CO2 Flux Estimates Use Satellite Data

Source: Dan Hawkes

ESD climate scientists Margaret Torn and Sebastien Biraud were part of a team of investigators who earlier this year published one of the first estimates of CO2 surface-flux global distribution, using total column CO2 measurements retrieved from the Greenhouse gases Observing SATellite (GOSAT). They estimated fluxes from surface CO2 measurements to use as baselines for comparing GOSAT data-derived fluxes. Assimilating only GOSAT data, they reproduce the observed CO2 time series at surface and Total Carbon Column Observing Network (TCCON) sites in the tropics and the northern extra-tropics. They conclude that while GOSAT total column CO2 provide useful constraints for source-sink inversions, small spatiotemporal biases—beyond what can be detected using current validation techniques—have serious consequences for optimized fluxes, even aggregated over continental scales.

For more information, go to: http://www.atmos-chem-phys-discuss.net/13/4535/2013/acpd-13-4535-2013.html

Citation: Basu, S., S. Guerlet, A. Butz, S. Houweling, O. Hasekamp, I. Aben, P. Krummel, P. Steele, R. Langenfelds, M.S. Torn, S.C. Biraud, B. Stephens, A. Andrews, and D. Worthy (2013), Global CO2 fluxes estimated from GOSAT retrievals of total column CO2. Atmos. Chem. Phys. Discuss., 13, 4535-4600; DOI:10.5194/acpd-13-4535-2013, 2013.

Funding Source: NASA, EU, TCCON