Impacts of cloud and turbulence schemes on integrated water vapor: comparison between model predictions and GPS measurements |
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| Authors: | G Lenderink E van Meijgaard |
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| Institution: | (1) Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands, NL |
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| Abstract: | Summary Structures in atmospheric Integrated Water Vapor (IWV) have been studied for the three successive cyclones, Kerstin, Liane
and Monika, which controlled the meteorological conditions in the Baltic Sea catchment region in the period from 28 August
to 5 September 1995 (part of the PIDCAP observational campaign defined within BALTEX). Several model predictions of these
cyclones have been performed with a regional atmospheric general circulation model (RACMO). The impact of two different versions
of the model physics package (standard ECHAM4 and a revised version with modifications in the cloud and turbulence scheme)
has been investigated. Model predicted IWV has been evaluated with GPS station data from several stations in Sweden and Finland.
For the most strongly developed cyclone Monika, the revised scheme generates more pronounced IWV structures, with well defined
bands of high and low values of IWV curving into the center of the cyclone. In particular, the shape of the minima are in
better agreement with the GPS station data, and the consistency between two subsequent model forecasts is also larger with
the revised physics package. For the weaker systems, Kerstin and Liane, results from both model versions are very similar.
Received August 11, 2000 Revised February 13, 2001 |
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