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| Titel |
Role of land surface processes and diffuse/direct radiation partitioning in simulating the European climate |
| VerfasserIn |
E. L. Davin, S. I. Seneviratne |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 5 ; Nr. 9, no. 5 (2012-05-11), S.1695-1707 |
| Datensatznummer |
250007024
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| Publikation (Nr.) |
 copernicus.org/bg-9-1695-2012.pdf |
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| Zusammenfassung |
The influence of land processes and in particular of diffuse/direct radiation
partitioning on surface fluxes and associated regional-scale climate feedbacks
is investigated using ERA-40 driven simulations over Europe performed with the
COSMO-CLM2 Regional Climate Model (RCM). Two alternative Land Surface
Models (LSMs), a 2nd generation LSM (TERRA_ML) and a more advanced
3rd generation LSM (Community Land Model version 3.5), and two versions
of the atmospheric component are tested, as well as a revised coupling
procedure allowing for variations in diffuse/direct light partitioning at the
surface, and their accounting by the land surface component.
Overall, the RCM performance for various variables (e.g., surface fluxes,
temperature and precipitation) is improved when using the more advanced
3rd generation LSM. These improvements are of the same order of magnitude
as those arising from a new version of the atmospheric component,
demonstrating the benefit of using a realistic representation of land surface
processes for regional climate simulations. Taking into account the variability in
diffuse/direct light partitioning at the surface further improves the model
performance in terms of summer temperature variability at the monthly and
daily time scales. Comparisons with observations show that the RCM
realistically captures temporal variations in diffuse/direct light
partitioning as well as the evapotranspiration sensitivity to these
variations. Our results suggest that a modest but consistent fraction (up to
3 %) of the overall variability in summer temperature can be explained by
variations in the diffuse to direct ratio. |
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