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| Titel |
On observational and modelling strategies targeted at regional carbon exchange over continents |
| VerfasserIn |
C. Gerbig, A. J. Dolman, M. Heimann |
| 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 ; 6, no. 10 ; Nr. 6, no. 10 (2009-10-01), S.1949-1959 |
| Datensatznummer |
250004024
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| Publikation (Nr.) |
 copernicus.org/bg-6-1949-2009.pdf |
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| Zusammenfassung |
| Estimating carbon exchange at regional scales is paramount to understanding
feedbacks between climate and the carbon cycle, but also to verifying
climate change mitigation such as emission reductions and strategies
compensating for emissions such as carbon sequestration. This paper
discusses evidence for a number of important shortcomings of current
generation modelling frameworks designed to provide regional scale budgets
from atmospheric observations. Current top-down and bottom-up approaches
targeted at deriving consistent regional scale carbon exchange estimates for
biospheric and anthropogenic sources and sinks are hampered by a number of
issues: we show that top-down constraints using point measurements made from
tall towers, although sensitive to larger spatial scales, are however
influenced by local areas much more strongly than previously thought. On the
other hand, classical bottom-up approaches using process information
collected at the local scale, such as from eddy covariance data, need
up-scaling and validation on larger scales. We therefore argue for a
combination of both approaches, implicitly providing the important local
scale information for the top-down constraint, and providing the atmospheric
constraint for up-scaling of flux measurements. Combining these data streams
necessitates quantifying their respective representation errors, which are
discussed. The impact of these findings on future network design is
highlighted, and some recommendations are given. |
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