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Numerical Study of Initial Soil Moisture Impacts on Regional Surface Climate

机译：土壤初始水分对区域地表气候影响的数值研究

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摘要

In this paper, the impacts of initial soil moisture (SM) over the Huaihe River Basin of China on the summertime climate have been investigated with a regional climate model. Three fourth-month-long simulations are made for two summers, the abnormal flooding in 2003 and normal climate in 2004. Besides control simulations (noted as CTL), sensitivity experiments have been conducted by assigning the initial soil moisture equals to 50% and 150% of the simulated soil moisture while keeping the others unchanged, which are noted as SM50 and SM150, respectively.The results show that effects of initial SM anomalies at late spring can last for the whole summer, and the increase of initial soil moisture (SM150) has more significant effects than the decreased one (SM50). The differences between sensitivity experiments and CTL mainly appear at surface and near-surface atmosphere. When increasing the initial SM, the latent heat flux and surface soil moisture are increased, correspondingly the sensible heat flux, temperature and radiation are all decreased. The changes of rainfall are not distinct between SM50 and SM150, which might be related to the processes within atmosphere, especially the humidity pattern.
机译：本文利用区域气候模型研究了淮河流域初始土壤水分（SM）对夏季气候的影响。在两个夏天进行了三个连续四个月的模拟，分别是2003年的洪水和2004年的正常气候。除了控制模拟（称为CTL）外，还通过将初始土壤湿度指定为50％和150进行了敏感性试验。模拟土壤湿度的百分比，而其他参数保持不变，分别记为SM50和SM150。结果表明，春季后期的初始SM异常的影响可以持续整个夏天，并且初始土壤湿度增加（SM150 ）的效果要比下降的效果（SM50）更大。敏感性实验和CTL之间的差异主要出现在地表和近地表大气中。当增加初始SM时，潜热通量和表层土壤水分增加，相应地显热通量，温度和辐射均降低。 SM50和SM150之间的降雨变化并不明显，这可能与大气中的过程有关，尤其是湿度模式。

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