多层土壤温度模拟及其检验

对陆面过程模式(BATS)土壤温度模拟进行了改进,提出了一个利用气象站资料模拟土壤温度的模式。研究结果表明：采用热扩散方程模拟多层土壤温度,可与观测站的资料直接比较;模式能很好地模拟各层土壤温度的年变化、季变化、日变化。冬季下层土壤温度高于上层土壤温度,夏季上层土壤温度高于下层土壤温度,上下层温度的转换时间大约在3月份和10月份,这与实测土壤温度的年变化非常一致;模式较准确地模拟了各层土壤温度垂直方向变化的时滞效应。

Simulation of Soil Temperature with a Multi-layer Model and Its Verification

This paper presents a soil temperature simulation scheme of using the conventional meteorological station data,thus improving the soil temperature simulation of the land surface process model of BATS proposed by Dickinson et al.This scheme can simulate the annual,seasonal and diurnal soil temperature variations at different depth fairly well.The results show that the simulated soil temperature of multi-layers by using the heat diffuse equation is comparable with the observed data;and the model is able to simulate the annual,seasonal and diurnal temperature variation very well at various levels.The temperature of deep layer is higher than that of surface layer in winter,while the upper layer temperature is higher than that of the deeper layer in summer.The times when the temperature gradient begins to reverse are about in April and October,which is in agreement with the feature observed.The model correctly simulates the time lags of soil temperature variations of various layers.