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| Titel |
On the ability of a global atmospheric inversion to constrain variations of CO2 fluxes over Amazonia |
| VerfasserIn |
L. Molina, G. Broquet, P. Imbach, F. Chevallier, B. Poulter, D. Bonal, B. Burban, M. Ramonet, L. V. Gatti, S. C. Wofsy, J. W. Munger, E. Dlugokencky, P. Ciais |
| 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 ; 15, no. 14 ; Nr. 15, no. 14 (2015-07-28), S.8423-8438 |
| Datensatznummer |
250119934
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| Publikation (Nr.) |
 copernicus.org/acp-15-8423-2015.pdf |
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| Zusammenfassung |
| The exchanges of carbon, water and energy between the atmosphere
and the Amazon basin have global implications for the current and future
climate. Here, the global atmospheric inversion system of the
Monitoring of Atmospheric Composition and Climate (MACC) service is
used to study the seasonal and interannual variations of
biogenic CO2 fluxes in Amazonia during the period 2002–2010. The
system assimilated surface measurements of atmospheric CO2 mole
fractions made at more than 100 sites over the globe into an atmospheric
transport model. The present study adds measurements from four surface
stations located in tropical South America, a region poorly covered by
CO2 observations. The estimates of net ecosystem exchange (NEE)
optimized by the inversion are compared to an independent estimate of
NEE upscaled from eddy-covariance flux measurements in Amazonia. They
are also qualitatively evaluated against reports on the seasonal and
interannual variations of the land sink in South America from the
scientific literature. We attempt at assessing the impact on NEE of
the strong droughts in 2005 and 2010 (due to severe and longer-than-usual
dry seasons) and the extreme rainfall conditions registered in 2009.
The spatial variations of the seasonal and interannual variability of
optimized NEE are also investigated. While the inversion supports the
assumption of strong spatial heterogeneity of these variations, the
results reveal critical limitations of the coarse-resolution transport model,
the surface observation network in South America during the recent
years and the present knowledge of modelling uncertainties in South
America that prevent our inversion from capturing the seasonal patterns
of fluxes across Amazonia. However, some patterns from the inversion
seem consistent with the anomaly of moisture conditions in 2009. |
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