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| Titel |
The importance of transport model uncertainties for the estimation of CO2 sources and sinks using satellite measurements |
| VerfasserIn |
S. Houweling, I. Aben, F.-M. Bréon, F. Chevallier, N. Deutscher, R. Engelen, C. Gerbig, D. Griffith, K. Hungershoefer, R. Macatangay, J. Marshall, J. Notholt, W. Peters, S. Serrar |
| 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 ; 10, no. 20 ; Nr. 10, no. 20 (2010-10-22), S.9981-9992 |
| Datensatznummer |
250008847
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| Publikation (Nr.) |
 copernicus.org/acp-10-9981-2010.pdf |
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| Zusammenfassung |
| This study presents a synthetic model intercomparison to investigate the
importance of transport model errors for estimating the sources and sinks of
CO2 using satellite measurements. The experiments were designed for
testing the potential performance of the proposed CO2 lidar A-SCOPE, but
also apply to other space borne missions that monitor total column CO2.
The participating transport models IFS, LMDZ, TM3, and TM5 were run in
forward and inverse mode using common a priori CO2 fluxes and initial
concentrations. Forward simulations of column averaged CO2 (xCO2)
mixing ratios vary between the models by σ=0.5 ppm over the
continents and σ=0.27 ppm over the oceans. Despite the fact that the
models agree on average on the sub-ppm level, these modest differences
nevertheless lead to significant discrepancies in the inverted fluxes of
0.1 PgC/yr per 106 km2 over land and 0.03 PgC/yr per 106 km2 over the
ocean. These transport model induced flux uncertainties exceed the target
requirement that was formulated for the A-SCOPE mission of 0.02 PgC/yr per
106 km2, and could also limit the overall performance of other CO2
missions such as GOSAT. A variable, but overall encouraging agreement is
found in comparison with FTS measurements at Park Falls, Darwin, Spitsbergen,
and Bremen, although systematic differences are found exceeding the 0.5 ppm
level. Because of this, our estimate of the impact of transport model
uncerainty is likely to be conservative. It is concluded that to make use of
the remote sensing technique for quantifying the sources and sinks of CO2
not only requires highly accurate satellite instruments, but also puts
stringent requirements on the performance of atmospheric transport models.
Improving the accuracy of these models should receive high priority, which
calls for a closer collaboration between experts in atmospheric dynamics and
tracer transport. |
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