On the capability of RegCM to capture extremes in long term regional climate simulation – comparison with the observations for Czech Republic |
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Authors: | T Halenka J Kalvová Z Chládová A Demeterová K Zemánková M Belda |
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Affiliation: | (1) Department of Meteorology and Environment Protection, Charles University, Prague, Czech Republic;(2) Regular associate of the Abdus Salam ICTP, Trieste, Italy |
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Abstract: | Summary We analyze daily precipitation and temperature extremes over the Czech Republic in a regional climate simulation for the 40-year
period of 1961–2000 carried out with the RegCM3 regional climate model. The model is run at 45 km grid interval and is driven
by NCEP/NCAR reanalysis lateral boundary conditions. Comparison with station data shows that the model performs reasonably
well in simulating the frequency of daily precipitation events of medium to high intensity as well as the precipitation intensities
(return levels) of long return periods, with the exception of mountain stations. While this is attributed mainly to the relatively
coarse representation of topography across the area of the Czech Republic, the parameterization of convection can be another
reason. The model underestimates daily maximum temperature (especially in the warm seasons) and as a result the occurrence
of heat waves (high temperature episodes). The performance of the model improves in the simulation of daily minimum temperature
and cold wave events. In order to apply this regional model to the simulation of extreme events over the complex terrain as
for Czech Republic we recommend that a higher resolution is used in order to better describe the topography of the Czech Republic
and that the daily maximum temperature bias is reduced. |
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