 |
| Titel |
Modelling root water uptake in a complex land surface scheme coupled to a GCM |
| VerfasserIn |
P. Rosnay, J. Polcher |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 2, no. 2/3 ; Nr. 2, no. 2/3, S.239-255 |
| Datensatznummer |
250000352
|
| Publikation (Nr.) |
 copernicus.org/hess-2-239-1998.pdf |
|
|
|
|
|
| Zusammenfassung |
| The aim of this paper is to improve the
representation of root water uptake in the land surface scheme SECHIBA coupled to the LMD
General Circulation Model (GCM). Root water uptake mainly results from the interaction
between soil moisture and root profiles. Firstly, one aspect of the soil hydrology in
SECHIBA is changed: it is shown that increasing the soil water storage capacity leads to a
reduction in the frequency of soil water drought, but enhances the mean
evapotranspiration. Secondly, the representation of the soil-vegetation interaction is
improved by allowing a different root profile for each type of vegetation. The interaction
between sub-grid scale variabilities in soil moisture and vegetation is also studied. The
approach consists of allocating a separate soil water column to each vegetation type,
thereby 'tiling' the grid square. However, the possibility of choosing the degree of soil
moisture spatial heterogeneity is retained. These enhancements of the land surface system
are compared within a number of GCM experiments. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|