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首页> 外文期刊>Advances in Atmospheric Sciences >Implementation of a surface runoff model with Horton and Dunne mechanisms into the regional climate model RegCM_NCC
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Implementation of a surface runoff model with Horton and Dunne mechanisms into the regional climate model RegCM_NCC

机译：利用Horton和Dunne机制将地表径流模型实施到区域气候模型RegCM_NCC中

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摘要

A surface runoff parameterization scheme that dynamically represents both Horton and Dunne runoff generation mechanisms within a model grid cell together with a consideration of the subgrid-scale soil heterogeneity, is implemented into the National Climate Center regional climate model (RegCM_NCC). The effects of the modified surface runoff scheme on RegCM_NCC performance are tested with an abnormal heavy rainfall process which occurred in summer 1998. Simulated results show that the model with the original surface runoff scheme (noted as CTL) basically captures the spatial pattern of precipitation, circulation and land surface variables, but generally overestimates rainfall compared to observations. The model with the new surface runoff scheme (noted as NRM) reasonably reproduces the distribution pattern of various variables and effectively diminishes the excessive precipitation in the CTL. The processes involved in the improvement of NRM-simulated rainfall may be as follows: with the new surface runoff scheme, simulated surface runoff is larger, soil moisture and evaporation (latent heat flux) are decreased, the available water into the atmosphere is decreased; correspondingly, the atmosphere is drier and rainfall is decreased through various processes. Therefore, the implementation of the new runoff scheme into the RegCM_NCC has a significant effect on results at not only the land surface, but also the overlying atmosphere.
机译：在国家气候中心区域气候模型（RegCM_NCC）中，实施了一个地表径流参数化方案，该方案可动态表示模型网格内的Horton和Dunne径流生成机制，同时考虑亚栅格规模的土壤异质性。在1998年夏季发生的一次异常强降雨过程中，测试了修改后的地表径流方案对RegCM_NCC性能的影响。模拟结果表明，具有原始地表径流方案（称为CTL）的模型基本捕获了降水的空间格局，环流和地表变量，但与观测值相比通常高估了降雨量。具有新的地表径流方案的模型（称为NRM）合理地再现了各个变量的分布模式，并有效地减少了CTL中的过量降水。 NRM模拟降雨的改善过程可能如下：采用新的地表径流方案，模拟的地表径流更大，土壤水分和蒸发（潜热通量）减少，进入大气的水减少；相应地，大气变干，降雨通过各种过程而减少。因此，将新的径流方案实施到RegCM_NCC中不仅对陆地表面而且对上层大气的结果都有重大影响。

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