Spatially resolved land-surface modeling using CLM for the ARM SGP site

Description

We have developed a modeling framework to ingest Mesonet climate forcing (solar radiation, humidity, temperature, precipitation, wind speed), U.S. Department of Agriculture (USDA) crop and vegetation cover at 30 m, and 1-km U.S. Geological Survey (USGS) soil characterization data into CLM4.5 (the land model integrated in the Community Earth System Model (CESM), the Department of Energy/National Center for Atmospheric Research (DOE/NCAR) climate model. CLM4.5, the new version of CLM to be released this summer, includes an explicit representation of several crops (corn, soy, pasture, summer wheat). We distributed the Mesonet climate forcing to 10-km resolution and ran CLM at that resolution with the dominant three vegetation cover types in each grid cell. Climate forcing has been generated for approximately the past ten years, and we continuously update these fields as information is passed to the ARM Data Archive. CLM4.5 lacks phenological, respiration, and photosynthetic parameterizations for winter wheat, as well as explicit water or fertilizer management. We have begun work to implement new parameterizations for these processes and compare to eddy covariance observations in the region. We report here on model performance and patterns in net ecosystem C, water, and sensible heat exchanges over the ten-year record.