| 土壤热异常影响地表能量平衡的个例分析和数值模拟 |
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| 作者姓名： | Guo Weidong Sun Shufen Qian Yongfu |
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| 作者单位： | Guo Weidong SunShufen and Qian YongfuDepartment of Atmospheric Sciences，Nanjing University，Nanjing 210093 LASG，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029 |
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| 基金项目： | This paper is jointly sponsored by China NKBRSF Project G1999043400,National Natural Science Foundationof China under Grant Nos.49835010and 40075019,and China Post Doctoral Science Foundation. |
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| 摘 要： | 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 revealed 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 m-2 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℃ can be found compared to the control run. The anomaly, however, could reach 0.65℃ if the soil thermal conductivity was one order of magnitude larger. It could be even as large as 0.81℃ assuming the heat flux at bottom is 10 W m-2. Meanwhile, an increase of about 10 W m-2 was detected both for heat flux in soil and sensible heat on land surface, 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.
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| 关 键 词： | 土壤热异常 陆面过程模式 地表能量平衡 短期气候变化 陆气耦合模式 |
| 收稿时间： | 5 April 2001 |
Case analyses and numerical simulation of soil thermal impacts on land surface energy budget based on an off-line land surface model |
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| Guo Weidong,Sun Shufen,Qian Yongfu.Case analyses and numerical simulation of soil thermal impacts on land surface energy budget based on an off-line land surface model[J].Advances in Atmospheric Sciences,2002,19(3):500-512. |
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| Authors: | Guo Weidong Sun Shufen Qian Yongfu |
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| Institution: | Department of Atmospheric Sciences Nanjing University, Nanjing 210093;LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Department of Atmospheric Sciences Nanjing University, Nanjing 210093 |
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| Abstract: | 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. |
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| Keywords: | Soil thermal anomaly Land surface model Land surface energy budget |
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