We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Inverse modeling of CO<sub>2</sub> sources and sinks using satellite observations of CO<sub>2</sub> from TES and surface flask measurements.
- Authors
Nassar, R.; Jones, D. B. A.; Kulawik, S. S.; Worden, J. R.; Bowman, K. W.; Andres, R. J.; Suntharalingam, P.; Chen, J. M.; Brenninkmeijer, C. A. M.; Schuck, T. J.; Conway, T. J.; Worthy, D. E.
- Abstract
We infer CO2 surface fluxes using satellite observations of mid-tropospheric CO2 from the Tropospheric Emission Spectrometer (TES) and measurements of CO2 from surface flasks in a time-independent inversion analysis based on the GEOS-Chem model. Using TES CO2 observations over oceans, spanning 40° S-40° N, we find that the horizontal and vertical coverage of the TES and flask data are complementary. This complementarity is demonstrated by combining the datasets in a joint inversion, which provides better constraints than from either dataset alone, when a posteriori CO2 distributions are evaluated against independent ship and aircraft CO2 data. In particular, the joint inversion offers improved constraints in the tropics where surface measurements are sparse, such as the tropical forests of South America, which the joint inversion suggests was a weak sink of -0.17 ± 0.20 PgC in 2006. Aggregating the annual surface-to-atmosphere fluxes from the joint inversion yields -1.13 ± 0.21 PgC for the global ocean, -2.77 ± 0.20 Pg C for the global land biosphere and -3.90 ± 0.29 Pg C for the total global natural flux (defined as the sum of all biospheric, oceanic, and biomass burning contributions but excluding CO2 emissions from fossil fuel combustion). These global ocean, global land and total global fluxes are shown to be in the range of other inversion results for 2006. To achieve these results, a latitude dependent bias in TES CO2 in the Southern Hemisphere was assessed and corrected using aircraft flask data, and we demonstrate that our results have low sensitivity to variations in the bias correction approach. Overall, this analysis suggests that future carbon data assimilation systems can benefit by integrating in situ and satellite observations of CO2 and that the vertical information provided by satellite observations of mid-tropospheric CO2 combined with measurements of surface CO2, provides an important additional constraint for flux inversions.
- Subjects
SOUTH America; CARBON dioxide; ARTIFICIAL satellites; TROPOSPHERE; MEASUREMENT; BIOMASS; COMBUSTION
- Publication
Atmospheric Chemistry & Physics Discussions, 2011, Vol 11, Issue 2, p4263
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-11-4263-2011