| PRELIMINARY NUMERICAL STUDY OF TOPOGRAPHIC EFFECTS OF THE TIBETAN PLATEAU ON SURFACE DIRECT RADIATION |
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| 作者姓名： | 张正秋 周秀骥 李维亮 |
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| 作者单位： | Department of Atmospheric Sciences Peking University，Beijing 100871，Chinese Academy of Meteorological Sciences，Beijing 100081，Chinese Academy of Meteorological Sciences，Beijing 100081 |
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| 基金项目： | Supported by the National Key Program for Developing Basic Sciences(G1998040800). |
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| 摘 要： | To improve the simulating ability of a model,this paper presents a scheme of calculatingdirect radiation at land surface with topography in the model.A numerical study is conducted forthe topographic effects of the Tibetan Plateau on the direct radiation using NCEP terrain data.Results show that,after taking account into the topographic radiation effect,the regional averageof the radiation over the Plateau obviously increases in the local early morning and late afternoon,but changes less around noon.The effect is stronger in winter than that in summer.Andheterogeneous topography has also affected the distribution of the radiation in this area.A simplenumerical experiment shows that considering the effect will lead ground temperature to increase onthe slope having more sunshine,and vice versa.
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PRELIMINARY NUMERICAL STUDY OF TOPOGRAPHIC EFFECTS OF THE TIBETAN PLATEAU ON SURFACE DIRECT RADIATION |
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| ZHANG Zhengqiu.PRELIMINARY NUMERICAL STUDY OF TOPOGRAPHIC EFFECTS OF THE TIBETAN PLATEAU ON SURFACE DIRECT RADIATION[J].Acta Meteorologica Sinica,2002(1). |
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| Authors: | ZHANG Zhengqiu |
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| Institution: | ZHANG Zhengqiu Department of Atmospheric Sciences,Peking University,Beijing 100871ZHOU Xiuji LI Weiliang Chinese Academy of Meteorological Sciences,Beijing 100081 |
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| Abstract: | To improve the simulating ability of a model,this paper presents a scheme of calculating direct radiation at land surface with topography in the model.A numerical study is conducted for the topographic effects of the Tibetan Plateau on the direct radiation using NCEP terrain data. Results show that,after taking account into the topographic radiation effect,the regional average of the radiation over the Plateau obviously increases in the local early morning and late afternoon, but changes less around noon.The effect is stronger in winter than that in summer.And heterogeneous topography has also affected the distribution of the radiation in this area.A simple numerical experiment shows that considering the effect will lead ground temperature to increase on the slope having more sunshine,and vice versa. |
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| Keywords: | the Tibetan Plateau topographic effect direct radiation characteristics |
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