%0 Journal Article
%T Case Analyses and Numerical Simulation of Soil Thermal Impacts on Land Surface Energy Budget Based on an Off-Line Land Surface Model<br>土壤热异常影响地表能量平衡的个例分析和数值模拟
%A Guo Weidong
%A Sun Shufen
%A Qian Yongfu
%A <br>Guo Weidong
%A Sun Shufen
%A Qian Yongfu
%J 大气科学进展
%D 2002
%I 
%X The statistical relationship between soil thermal anomaly and short-term climate change is presented based on a typical case study. Furthermore, possible physical mechanisms behind the relationship are re-vealed through using an off-line land surface model with a reasonable soil thermal forcing at the bottom of the soil layer. In the first experiment, the given heat flux is 5 W m2 at the bottom of the soil layer (in depth of 6.3 m) for 3 months, while only a positive ground temperature anomaly of 0.06°C can be found compared to the control run. The anomaly, however, could reach 0.65°C if the soil thermal conductivity was one order of magnitude larger. It could be even as large as 0.81°C assuming the heat flux at bottom is 10 W m-2. Mean-while, an increase of about 10 W m 2 was detected both for heat flux in soil and sensible heat on land sur-face, which is not neglectable to the short-term climate change. The results show that considerable response in land surface energy budget could be expected when the soil thermal forcing reaches a certain spatial-tem-poral scale. Therefore, land surface models should not ignore the upward heat flux from the bottom of the soil layer. Moreover, integration for a longer period of time and coupled land-atmosphere model are also necessary for the better understanding of this issue.
%K Soil thermal anomaly
%K Land surface model
%K Land surface energy budget<br>土壤热异常
%K 陆面过程模式
%K 地表能量平衡
%K 短期气候变化
%K 陆气耦合模式
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=28A2F569B2458C17&jid=5434AFBF6CB6E7E8D67733B541F211C7&aid=6CABEB367C42D5FF5EEF138349993B17&yid=C3ACC247184A22C1&vid=2A8D03AD8076A2E3&iid=38B194292C032A66&sid=8566B4AE2A8832E3&eid=D8AE57480552698F&journal_id=0256-1530&journal_name=大气科学进展&referenced_num=4&reference_num=13