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| Titel |
Improving the ISBACC land surface model simulation of water and carbon fluxes and stocks over the Amazon forest |
| VerfasserIn |
E. Joetzjer, C. Delire, Hervé Douville, P. Ciais, B. Decharme, D. Carrer, H. Verbeeck, M. Weirdt, D. Bonal |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 6 ; Nr. 8, no. 6 (2015-06-10), S.1709-1727 |
| Datensatznummer |
250116404
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| Publikation (Nr.) |
 copernicus.org/gmd-8-1709-2015.pdf |
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| Zusammenfassung |
| We evaluate the ISBACC (Interaction Soil Biosphere Atmosphere Carbon Cycle) land surface model (LSM) over the Amazon forest, and
propose a revised parameterization of photosynthesis, including new soil
water stress and autotrophic respiration (RA) functions. The revised version
allows the model to better capture the energy, water and carbon fluxes when
compared to five Amazonian flux towers. The performance of ISBACC is
slightly site dependent although similar to the widely evaluated LSM ORCHIDEE (Organizing Carbon and Hydrology In Dynamic Ecosystems – version 1187), which is based on different assumptions. Changes made to the
autotrophic respiration functions, including a vertical profile of leaf
respiration, lead to yearly simulated carbon use efficiency (CUE) and carbon
stocks which is consistent with an ecophysiological meta-analysis conducted on three
Amazonian sites. Despite these major improvements, ISBACC struggles to
capture the apparent seasonality of the carbon fluxes derived from the
flux tower estimations. However, there is still no consensus on the
seasonality of carbon fluxes over the Amazon, stressing a need for more
observations as well as a better understanding of the main drivers of
autotrophic respiration. |
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