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| Titel |
Evaluation of various observing systems for the global monitoring of CO2 surface fluxes |
| VerfasserIn |
K. Hungershoefer, F.-M. Bréon, P. Peylin, F. Chevallier, P. Rayner, A. Klonecki, S. Houweling, J. Marshall |
| 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. 21 ; Nr. 10, no. 21 (2010-11-10), S.10503-10520 |
| Datensatznummer |
250008880
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| Publikation (Nr.) |
 copernicus.org/acp-10-10503-2010.pdf |
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| Zusammenfassung |
In the context of rising greenhouse gas concentrations, and
the potential feedbacks between climate and the carbon cycle,
there is an urgent need to monitor the exchanges of carbon
between the atmosphere and both the ocean and the land
surfaces. In the so-called top-down approach, the surface
fluxes of CO2 are inverted from the observed spatial
and temporal concentration gradients. The concentrations of
CO2 are measured in-situ at a number of surface
stations unevenly distributed over the Earth while several
satellite missions may be used to provide a dense and
better-distributed set of observations to complement this
network. In this paper, we compare the ability of different
CO2 concentration observing systems to constrain
surface fluxes. The various systems are based on realistic
scenarios of sampling and precision for satellite and in-situ
measurements.
It is shown that satellite measurements based on the
differential absorption technique (such as those of SCIAMACHY,
GOSAT or OCO) provide more information than the thermal
infrared observations (such as those of AIRS or IASI). The OCO
observations will provide significantly better information
than those of GOSAT. A CO2 monitoring mission based on
an active (lidar) technique could potentially provide an even
better constraint. This constraint can also be realized with
the very dense surface network that could be built with the
same funding as that of the active satellite mission. Despite
the large uncertainty reductions on the surface fluxes that
may be expected from these various observing systems, these
reductions are still insufficient to reach the highly
demanding requirements for the monitoring of anthropogenic
emissions of CO2 or the oceanic fluxes at a spatial
scale smaller than that of oceanic basins. The scientific
objective of these observing system should therefore focus on
the fluxes linked to vegetation and land ecosystem dynamics. |
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