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| Titel |
Interactive coupling of regional atmosphere with biosphere in the new generation regional climate system model REMO-iMOVE |
| VerfasserIn |
C. Wilhelm, D. Rechid, D. Jacob |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 3 ; Nr. 7, no. 3 (2014-06-06), S.1093-1114 |
| Datensatznummer |
250115631
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| Publikation (Nr.) |
 copernicus.org/gmd-7-1093-2014.pdf |
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| Zusammenfassung |
The main objective of this study is the coupling of the regional climate
model REMO with a new land surface scheme including dynamic vegetation
phenology, and the evaluation of the new model version called REMO with
interactive MOsaic-based VEgetation: REMO-iMOVE.
First, we focus on the documentation of the technical aspects of the new
model constituents and the coupling mechanism. The representation of
vegetation in iMOVE is based on plant functional types (PFTs). Their
geographical distribution is prescribed to the model which can be derived
from different land surface data sets. Here, the PFT distribution is derived
from the GLOBCOVER 2000 data set which is available on 1 km × 1 km horizontal
resolution. Plant physiological processes like photosynthesis, respiration
and transpiration are incorporated into the model. The vegetation modules are
fully coupled to atmosphere and soil. In this way, plant physiological
activity is directly driven by atmospheric and soil conditions at the model
time step (two minutes to some seconds). In turn, the vegetation processes
and properties influence the exchange of substances, energy and momentum
between land and atmosphere. With the new coupled regional model system,
dynamic feedbacks between vegetation, soil and atmosphere are represented at
regional to local scale.
In the evaluation part, we compare simulation results of REMO-iMOVE and of
the reference version REMO2009 to multiple observation data sets of
temperature, precipitation, latent heat flux, leaf area index and net primary
production, in order to investigate the sensitivity of the regional model to
the new land surface scheme and to evaluate the performance of both model
versions. Simulations for the regional model domain Europe on a horizontal
resolution of 0.44° had been carried out for the time period 1995–2005,
forced with ECMWF ERA-Interim reanalyses data as lateral boundary conditions.
REMO-iMOVE is able to simulate the European climate with the same quality as
the parent model REMO2009. Differences in near-surface climate parameters can
be restricted to some regions and are mainly related to the new
representation of vegetation phenology. The seasonal and interannual
variations in growth and senescence of vegetation are captured by the model.
The net primary productivity lies in the range of observed values for most
European regions. This study reveals the need for implementing vertical soil
water dynamics in order to differentiate the access of plants to water due to
different rooting depths. This gets especially important if the model will be
used in dynamic vegetation studies. |
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