regcm3 lisa c. sloan and mark a. snyder climate change and impacts laboratory dept. of earth and...
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![Page 1: RegCM3 Lisa C. Sloan and Mark A. Snyder Climate Change and Impacts Laboratory Dept. of Earth and Planetary Sciences University of California, Santa Cruz](https://reader036.vdocuments.site/reader036/viewer/2022062515/56649f455503460f94c66887/html5/thumbnails/1.jpg)
RegCM3
Lisa C. Sloan and Mark A. Snyder
Climate Change and Impacts Laboratory
Dept. of Earth and Planetary Sciences
University of California, Santa Cruz
NARCCAP User’s Meeting | February 14, 2008
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RegCM3 Details
• Hydrostatic equations• Sigma coordinates in vertical (terrain following)• BATS1E land surface model• Zeng ocean flux parameterization (atm/ocean fluxes)• SUBEX large scale precipitation parameterization• Grell convective precipitation parameterization• CCM3 radiation scheme• Pal et al. 2007, Bulletin of the American
Meteorological Society (BAMS) provides more info
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RegCM3 Domain Details
• Horizontal resolution of 50 x 50 km
• Vertical resolution of 18 levels
• Rotated Mercator projection, 130 north-south grid cells, 160 east-west gridcells
• Centered over North America at 47.5 N and 97.0 W
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RegCM3 Land Cover Types
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RegCM3 Topography (m)
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Temperature and Preciptation - samples from NARCCAP control run
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California Energy Commission (CEC) Land Cover Intercomparison
• Four regional climate models - RegCM3 (UCSC), MM5-CLM3 (LBL), RSM (Scripps), MM5 (UC Davis)
• Comparison of potential natural land cover to modern land cover
• Seasonal impact 1995 - 1996• Kueppers et al., 2008 Global and
Planetary ChangeQuickTime™ and a
decompressorare needed to see this picture.
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Modern and Natural Land Cover
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Soil Moisture Differences
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Surface Temperature Differences
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Climate study of the Irrigation Cooling Effect with RegCM3
• Extension of CEC runs to 20 years in length
• Kueppers, Snyder, and Sloan 2007 GRL
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Year to Year Variability
• Wet years and dry years identified
• Impact of irrigation in wet and dry years is nearly the same