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| Titel |
Recent global CO2 flux inferred from atmospheric CO2 observations and its regional analyses |
| VerfasserIn |
F. Deng, J. M. Chen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 11 ; Nr. 8, no. 11 (2011-11-11), S.3263-3281 |
| Datensatznummer |
250006199
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| Publikation (Nr.) |
 copernicus.org/bg-8-3263-2011.pdf |
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| Zusammenfassung |
| The net surface exchange of CO2 for the years 2002–2007 is inferred
from 12 181 atmospheric CO2 concentration data with a time-dependent
Bayesian synthesis inversion scheme. Monthly CO2 fluxes are optimized
for 30 regions of the North America and 20 regions for the rest of the
globe. Although there have been many previous multiyear inversion studies,
the reliability of atmospheric inversion techniques has not yet been
systematically evaluated for quantifying regional interannual variability in
the carbon cycle. In this study, the global interannual variability of the
CO2 flux is found to be dominated by terrestrial ecosystems,
particularly by tropical land, and the variations of regional terrestrial
carbon fluxes are closely related to climate variations. These interannual
variations are mostly caused by abnormal meteorological conditions in a few
months in the year or part of a growing season and cannot be well
represented using annual means, suggesting that we should pay attention to
finer temporal climate variations in ecosystem modeling. We find that,
excluding fossil fuel and biomass burning emissions, terrestrial ecosystems
and oceans absorb an average of 3.63 ± 0.49 and 1.94 ± 0.41 Pg C yr−1,
respectively. The terrestrial uptake is mainly in northern land while the
tropical and southern lands contribute 0.62 ± 0.47, and 0.67 ± 0.34 Pg C yr−1
to the sink, respectively. In North America, terrestrial ecosystems
absorb 0.89 ± 0.18 Pg C yr−1 on average with a strong flux density found in
the south-east of the continent. |
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