| Numerical Simulation of the Critical Scale of Oasis Maintenance and Development in the Arid Regions of Northwest China |
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| 作者姓名： | GAO Yanhong CHEN Yuchun Lü Shihua |
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| 作者单位： | ColdandAridRegionsEnvironmentalandEngineeringResearchInstitute,ChineseAcademyofSciences,Lanzhou730000 |
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| 基金项目： | This study was supported by the National Natural Science Foundation of China under Grant Nos，中国科学院资助项目 |
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| 摘 要： | Oasis is a special geographic landscape among the vast desert/Gobi in Northwest China (NWC). The surface sensitive heat flux and latent heat flux at Zhangye Oasis during 1 to 11 August 1991 are simulated using the NCAR nonhydrostatic mesoscale model MM5 Version 3. The horizontal grid resolution is set as 1km. By comparing the simulation results with HEIFE observations, it is proved that the model can be used to simulate the surface energy and water mass exchange of arid and semiarid regions in NWC.Based on the above results, the influence of different oasis scales on the local atmospheric field near the ground surface, and the critical scale of oasis maintenance, in NWC are studied dynamically. The following conclusion is obtained: the local thermal circulation between the oasis and the desert/Gobi is formed in the oasis downstream if the oasis scale is larger than 4 km. This local thermal circulation between the oasis and the desert adjacent to the oasis helps to conserve water vapor over the oasis. At the sametime, it transfers the abundant water vapor from the oasis into the desert/Gobi near to the oasis to supply relatively plentiful water vapor for desert crops to grow on the fringe of the oasis. So, it is advantageous for oasis extension. However, if the scale of the oasis is smaller than 4 km, it is not easy for the local thermal circulation between the oasis and the desert/Gobi to take shape. This study provides a new standpoint for oasis maintenance and development.
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| 关 键 词： | 数字模拟 绿洲 干旱地区 水土保持 中国西北 中尺度 |
| 收稿时间： | 29 August 2005 |
Numerical simulation of the critical scale of oasis maintenance and development in the arid regions of Northwest China |
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| GAO Yanhong,CHEN Yuchun,Lü Shihua.Numerical Simulation of the Critical Scale of Oasis Maintenance and Development in the Arid Regions of Northwest China[J].Advances in Atmospheric Sciences,2004,21(1):113-124. |
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| Authors: | GAO Yanhong CHEN Yuchun Lü Shihua |
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| Institution: | Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000 |
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| Abstract: | Oasis is a special geographic landscape among the vast desert/Gobi in Northwest China (NWC).The surface sensitive heat flux and latent heat flux at Zhangye Oasis during I to 11 August 1991 are simulated using the NCAR nonhydrostatic mesoscale model MM5 Version 3.The horizontal grid resolution is set as lkm.By comparing the simulation results with HEIFE observations,it is proved that the model can be used to simulate the surface energy and water mass exchange of arid and semiarid regions in NWC.Based on the above results,the influence of different oasis scales on the local atmospheric field near the ground surface,and the critical scale of oasis maintenance,in NWC are studied dynamically.The following conclusion is obtained: the local thermal circulation between the oasis and the desert/Gobi is formed in the oasis downstream if the oasis scale is larger than 4 km.This local thermal circulation between the oasis and the desert adjacent to the oasis helps to conserve water vapor over the oasis.At the same time,it transfers the abundant water vapor from the oasis into the desert/Gobi near to the oasis to supply relatively plentiful water vapor for desert crops to grow on the fringe of the oasis.So,it is advantageous for oasis extension.However,if the scale of the oasis is smaller than 4 km,it is not easy for the local thermal circulation between the oasis and the desert/Gobi to take shape.This study provides a new standpoint for oasis maintenance and development. |
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| Keywords: | MM5 oasis desert/Gobi critical scale local thermal circulation |
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