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| Titel |
The effect of sub-grid rainfall variability on the water balance and flux exchange processes resolved at climate scale: the European region contrasted to Central Africa and Amazon rainforests |
| VerfasserIn |
D. Wang, E. N. Anagnostou, G. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 7th Plinius Conference on Mediterranean Storms (2005) ; Nr. 7 (2006-04-10), S.269-274 |
| Datensatznummer |
250004303
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| Publikation (Nr.) |
 copernicus.org/adgeo-7-269-2006.pdf |
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| Zusammenfassung |
| This paper investigates the effect of sub-grid rainfall variability on the
simulation of land surface hydrologic processes of three regions (Europe,
Africa and Amazon) with contrasting precipitation and vegetation
characteristics. The sub-grid rainfall variability is defined in terms of
the rainfall coverage fraction at the model's grid cells, and the
statistical distribution of rain rates within the rain-covered areas. A
statistical-dynamic approach is devised to incorporate the above variability
properties into the canopy interception process of a land surface model. Our
results reveal that incorporation of sub-grid rainfall variability
significantly impacts the land-atmosphere water vapor exchanges.
Specifically, it alters the partitioning between runoff and total
evapotranspiration as well as the partitioning among the three components of
evapotranspiration (canopy interception loss, ground evaporation and plant
transpiration). This further influences the soil water, and to a lesser
effect surface/vegetation temperatures and surface heat fluxes. It is shown
that, overall, rainfall variability exerts less of an impact on the
land-atmosphere flux exchanges over Europe compared to Africa and Amazon. |
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