A Climate Version of the Regional Atmospheric Modeling System |
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Authors: | G E Liston R A Pielke |
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Institution: | (1) Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA, US |
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Abstract: | Summary The Regional Atmospheric Modeling System (RAMS) has been widely used to simulate relatively short-term atmospheric processes.
To perform full-year to multi-year model integrations, a climate version of RAMS (ClimRAMS) has been developed, and is used
to simulate diurnal, seasonal, and annual cycles of atmospheric and hydrologic variables and interactions within the central
United States during 1989. The model simulation uses a 200-km grid covering the conterminous United States, and a nested,
50-km grid covering the Great Plains and Rocky Mountain states of Kansas, Nebraska, South Dakota, Wyoming, and Colorado. The
model’s lateral boundary conditions are forced by six-hourly NCEP reanalysis products. ClimRAMS includes simplified precipitation
and radiation sub-models, and representations that describe the seasonal evolution of vegetation-related parameters. In addition,
ClimRAMS can use all of the general RAMS capabilities, like its more complex radiation sub-models, and explicit cloud and
precipitation microphysics schemes. Thus, together with its nonhydrostatic and fully-interactive telescoping-grid capabilities,
ClimRAMS can be applied to a wide variety of problems. Because of non-linear interactions between the land surface and atmosphere,
simulating the observed climate requires simulating the observed diurnal, synoptic, and seasonal cycles. While previous regional
climate modeling studies have demonstrated their ability to simulate the seasonal cycles through comparison with observed
monthly-mean temperature and precipitation data sets, this study demonstrates that a regional climate model can also capture
observed diurnal and synoptic variability. Observed values of daily precipitation and maximum and minimum screen-height air
temperature are used to demonstrate this ability.
Received September 27, 1999 Revised December 11, 1999 |
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