%0 Journal Article %A YI Xiang %A ZENG Xinmin %A WAGN Ning %A WAGN Ming %A ZHOU Xiao %A WANG Biao %T A High Temperature Weather Case Study About Sensitivity of Geopotential Height to Different Soil Moisture by Using WRF Model %D 2016 %R 10.11755/j.issn.1006-7639(2016)-01-0113 %J Journal of Arid Meteorology %P 113-124 %V 34 %N 1 %X

In this paper, the Weather Research and Forecasting model version 3.6 (WRFV3.6) is used to simulate the weather processes during the late May, June and July of 2003 in eastern China and analyze the impact of soil moisture on geopotential height (GPH). The results are as follows: (1)The GPHs of the middle and lower troposphere were very sensitive to soil moisture change, and the laws of GPHs change with the soil moisture in all the months were consistent with each other, but the GPH in the late July was more sensitive to soil moisture than that in the late May and June. The increase (decrease) of soil moisture would lead to the decrease (increase) of GPHs on 750-500 hPa levels and the increase (decrease) of GPHs below 850 hPa level. (2)Through the analysis of physical mechanism, it was found that the surface temperature was directly affected by simulated heat fluxes in different soil-moisture experiments, which modified the pressures on various height under the constraint of static equilibrium and air mass conservation, and finally caused the differences of the GPHs. (3)The GPH was most influenced by soil moisture during the daytime because of the strong diurnal heat flux transfer, under the dry (wet) soil moisture conditions, the surface temperature could rise (reduce) with a larger amplitude, which resulted in an apparently decrease (increase) of 850 hPa GPH and increase (decrease) of 500 hPa GPH, there was an opposite situation during the nighttime. The above results indicated that the soil moisture is very important in forecast and analysis of weather (especially high temperature weather) processes by using GPH, and it can help us better understand the influence mechanism of soil moisture in the land-atmosphere feedback processes.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2016)-01-0113