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|Authors: ||Alessandri, A.*|
|Title: ||Effects of Land-Surface-Vegetation on the boreal summer surface climate of a GCM|
|Series/Report no.: ||/ 20 (2006)|
|Issue Date: ||2006|
|Abstract: ||A Land Surface Model (LSM) has been included in the ECHAM4 Atmospheric
General Circulation Model (AGCM). The LSM is an early version
of ORCHIDEE (Organizing Carbon and Hydrology In Dynamic EcosystEms)
and it replaces the simple land surface scheme previously included in
ECHAM4. The purpose of this paper is to document how a more exhaustive
consideration of the land-surface-vegetation processes affects the simulated
boreal summer surface climate.
In order to investigate the impacts on the simulated climate, different sets
of AMIP-type simulations have been performed with Echam4 alone and with
the AGCM coupled with ORCHIDEE. Furthermore, to assess the effects of
the increase in horizontal resolution the coupling of Echam4 with the LSM
has been implemented at different horizontal resolutions.
The analysis reveals that the LSM has large effects on the simulated boreal
summer surface climate of the atmospheric model. Considerable impacts
are found in the surface energy balance due to changes in the surface
latent heat fluxes over tropical and mid-latitude areas covered with vegetation.
Rainfall and atmospheric circulation are substantially affected by these
changes. In particular, increased precipitation is found over evergreen and
summergreen vegetated areas.
Due to the socio-economical relevance, particular attention has been devoted
to the Indian Summer Monsoon (ISM) region. Our results indicate that
precipitation over the Indian subcontinent is better simulated with the coupled
Echam4-ORCHIDEE model compared to the atmospheric model alone.|
|Appears in Collections:||01.01.02. Climate|
03.01.03. Global climate models
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