陆面气象要素非均匀分布对模式计算的影响及其参数化初步探讨

资助项目:

国家重点基础研究发展规划项目 G1998040800

IMPACTOF HETEROGENEOUS LAND SURFACEON MODELS AND ITS PRELIMINARY PARAMETERIZATION

摘要: 为改进陆面过程的参数化，初步探讨了模式中陆面气象要素次网格尺度不均匀性分布对模拟计算结果的影响。应用平均化方法初步探讨陆面过程的参数化，并分析了气象要素次网格尺度不均匀性分布对计算结果的影响特征。结果表明，次网格尺度不均匀性分布对模式的计算结果会产生一定的偏差，可用平均化方法对陆面过程次网格尺度不均匀性分布进行初步参数化。
- 陆面过程;
- 次网格尺度;
- 不均匀性分布;
- 参数化
Abstract:
To improve the parameterization of land surface processes, a preliminary analysis of the impact of subgrid land surface heterogeneity on model results is carried out. The scheme of land surface process parameterization is presented by using an averaging method. The impact of heterogeneity is discussed. Numerical results show that the heterogeneity could lead a discrepancy between model results and reality, and the averaging method can be applied to the heterogeneous land surface
- Land surface process;
- Subgrid scale;
- Heterogeneity;
- Parameterization

图 1 中国地区1997 年6 月平均网格元粗糙度(a) 及其均方差(b)(单位:10^-1m)

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图 2 CDN 差值分布:(a)实际计算与模式计算的差值； (b)由式(15)计算的结果(单位:10^-4)

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图 3 网络点上地表温度次网络尺度非均匀性分布对模式计算结果的影响

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表 1 地表温度在随机范围为0～20 K内某网格点上各次网格上T_g 、R_s 和H_s

表 2 中国地区各区域中性曳力系数及其计算误差对比分析表

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