RegCM3 Lisa C. Sloan and Mark A. Snyder Climate Change and Impacts Laboratory Dept. of Earth and Planetary Sciences University of California, Santa Cruz.

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Presentation transcript:

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

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

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

RegCM3 Land Cover Types

RegCM3 Topography (m)

Temperature and Preciptation - samples from NARCCAP control run

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 Kueppers et al., 2008 Global and Planetary Change

Modern and Natural Land Cover

Soil Moisture Differences

Surface Temperature Differences

Climate study of the Irrigation Cooling Effect with RegCM3 Extension of CEC runs to 20 years in length Kueppers, Snyder, and Sloan 2007 GRL

Year to Year Variability Wet years and dry years identified Impact of irrigation in wet and dry years is nearly the same