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首页> 美国政府科技报告 >Prescription of Land-Surface Boundary Conditions in GISS GCM 2: A Simple Method Based on High-Resolution Vegetation Data Bases
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Prescription of Land-Surface Boundary Conditions in GISS GCM 2: A Simple Method Based on High-Resolution Vegetation Data Bases

机译：GIss GCm中陆面边界条件的处方2：基于高分辨率植被数据库的简单方法

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A simple method was developed for improved prescription of seasonal surface characteristics and parameterization of land-surface processes in climate models. This method, developed for the Goddard Institute for Space Studies General Circulation Model II (GISS GCM II), maintains the spatial variability of fine-resolution land-cover data while restricting to 8 the number of vegetation types handled in the model. This was achieved by: redefining the large number of vegetation classes in the 1 deg x 1 deg resolution Matthews (1983) vegetation data base as percentages of 8 simple types; deriving roughness length, field capacity, masking depth and seasonal, spectral reflectivity for the 8 types; and aggregating these surface features from the 1 deg x 1 deg resolution to coarser model resolutions, e.g., 8 deg latitude x 10 deg longitude or 4 deg latitude x 5 deg longitude.

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