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| Titel |
Inverse modeling of CO2 sources and sinks using satellite observations of CO2 from TES and surface flask measurements |
| VerfasserIn |
R. Nassar, D. B. A. Jones, S. S. Kulawik, J. R. Worden, K. W. Bowman, R. J. Andres, P. Suntharalingam, J. M. Chen, C. A. M. Brenninkmeijer, T. J. Schuck, T. J. Conway, D. E. Worthy |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 12 ; Nr. 11, no. 12 (2011-06-24), S.6029-6047 |
| Datensatznummer |
250009872
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| Publikation (Nr.) |
 copernicus.org/acp-11-6029-2011.pdf |
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| Zusammenfassung |
| 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.
Aggregating the annual surface-to-atmosphere fluxes from the joint inversion
for the year 2006 yields −1.13±0.21 Pg C 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 and global land fluxes are
shown to be near the median of the broad range of values from other
inversion results for 2006. To achieve these results, a 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. |
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