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一些陆面要素非均匀分布对模式计算结果影响的理论分析
THEORETICAL STUDY ON IMPACTS OF SOME LAND SURFACE ELEMENTS HETEROGENEITIES UPON MODEL OUTPUT
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摘要: 应用平均参数化方法,从理论上分别研究了地表温度、地面粗糙度、积雪深度和密度非均匀分布对相关物理量计算的影响。结果表明:考虑地表温度的非均匀分布影响后,模式网格上平均地面的长波辐射通量增加,地面饱和水汽压也增加;在相同的地表温度分布变差系数和常温情况下,与长波辐射通量相比,地面饱和水汽压的变化对地表温度非均匀分布较为敏感;地面粗糙度非均匀分布对地面中性曳力系数和BATS型地面积雪覆盖率有一定的影响;积雪深度和密度非均匀分布也对地面积雪覆盖率有一定的影响。Abstract: By means of averaged parameterization, a theoretical study is concerned with influences of the heterogeneous distributions of surface temperature, roughness, snow depth and density on their calculated physical quantities.Results indicate that with the surface temperature heterogeneity taken into account, gridded averaged long w ave radiation flux is increased and so is the saturation vapor pressure at surface, which is mo re sensitive to the temperature inhomogeneity compared to the radiation flux for the same coefficient of variation in the temperature distribution and constant temperature condition ;the heterogeneity of surface roughness exert s some impacts on neutral drag coefficient and BATS snow coverage and so does the inhomogeneity of snow depth and density on snow coverage .Key
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