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GEOPHYSICAL RESEARCH LETTERS,
VOL. 33,
L18805,
6 PP., 2006
doi:10.1029/2006GL027567
Diagnosis of the summertime warm and dry bias over the U.S. Southern Great Plains in the GFDL climate model using a weather forecasting approach
Atmospheric Science Division, Lawrence Livermore National Laboratory, Livermore, California, USA
Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, New Jersey, USA
Atmospheric Science Division, Lawrence Livermore National Laboratory, Livermore, California, USA
Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, USA
Atmospheric Science Division, Lawrence Livermore National Laboratory, Livermore, California, USA
Weather forecasts started from realistic initial conditions are used to diagnose the large warm and dry bias over the United States Southern Great Plains simulated by the GFDL climate model. The forecasts exhibit biases in surface air temperature and precipitation within 3 days which appear to be similar to the climate bias. With the model simulating realistic evaporation but underestimated precipitation, a deficit in soil moisture results which amplifies the initial temperature bias through feedbacks with the land surface. The underestimate of precipitation may be associated with an inability of the model to simulate the eastward propagation of convection from the front-range of the Rocky Mountains and is insensitive to an increase of horizontal resolution from 2° to 0.5° latitude.
Received 13 July 2006; accepted 14 August 2006; published 22 September 2006.
Citation: (2006), Diagnosis of the summertime warm and dry bias over the U.S. Southern Great Plains in the GFDL climate model using a weather forecasting approach, Geophys. Res. Lett., 33, L18805, doi:10.1029/2006GL027567.
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