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| Titel |
Surface response to rain events throughout the West African monsoon |
| VerfasserIn |
F. Lohou, L. Kergoat, F. Guichard, A. Boone, B. Cappelaere, J.-M. Cohard, J. Demarty, S. Galle, M. Grippa, C. Peugeot, D. Ramier, C. M. Taylor, F. Timouk |
| 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 ; 14, no. 8 ; Nr. 14, no. 8 (2014-04-17), S.3883-3898 |
| Datensatznummer |
250118623
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| Publikation (Nr.) |
 copernicus.org/acp-14-3883-2014.pdf |
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| Zusammenfassung |
| This study analyses the response of the continental surface to rain events,
taking advantage of the long-term near-surface measurements over different
vegetation types at different latitudes, acquired during the African Monsoon
Multidisciplinary Analysis (AMMA) by the AMMA-CATCH observing system. The
simulated surface response by nine land surface models involved in AMMA Land
Model Intercomparison Project (ALMIP), is compared to the observations. The
surface response, described via the evaporative fraction (EF), evolves in two
steps: the immediate surface response (corresponding to an increase of EF
occurring immediately after the rain) and the surface recovery (characterized
by a decrease of EF over several days after the rain). It is shown that, for
all the experimental sites, the immediate surface response is mainly
dependent on the soil moisture content and the recovery period follows an
exponential relationship whose rate is strongly dependent on the vegetation
type (from 1 day over bare soil to 70 days over forest) and plant functional
type (below and above 10 days for annual and perennial plants, respectively).
The ALMIP model ensemble depicts a broad range of relationships between EF
and soil moisture, with the worst results for the drier sites (high
latitudes). The land surface models tend to simulate a realistic surface
recovery for vegetated sites, but a slower and more variable EF decrease is
simulated over bare soil than observed. |
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