Radiant Heat Transportation at the Interface of Desert——Taking Gurbantunggut desert for example
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摘要: 根据古尔班通古特沙漠的自然与气候条件，对不同下垫面区域的太阳短波辐射量和地表与大气的长波辐射热量以及沙层热通量收支状况进行了测量分析。结果表明，流动沙漠层和固定沙漠层的热量传输差异主要是由地表状况、抄层性质和气温等因素决定的。流动沙漠区反射率和长波辐射大于固定沙漠区。沙漠层热通量随着沙层深度的增加而增大，而热量传输则随其深度的增加而减小，不同类型沙漠区地一气之间的热量传输过程，白天以感热、夜间以潜热的形式向大气传输，形成了沙漠地区对辐射热量特有的响应与反馈交换传输过程。同时，依据实测资料和地球表面热量平衡方程讨论了沙漠区域物理气候参数的变化特征，并进行了地-气界面热量过程耦合作用的模拟分析。Abstract: The radiant heat transportation at desert interface includes solar radiant heat flux,long wave radiant heat flux and desert surface heat flux. Based on the natural and climatic conditions of Gurbantunggut Desert,the author has measured and analyzed the heat budget on different underlying areas .The following results are mainly obtained: (1) The heat transportation on sand-shifting desert and on sand-fixed desert is different limited by individual surface feature,sand layer nature and air temperature etc. (2)The reflectivity and the long wave radiation on sand-shifting area are all larger than that on sand-fixed area. (3)The heat flux through sand layer increases with the layer going down;while heat transportation value changes with an inverse trend. (4)The heat transportation from earth to atmosphere on different desert types are in forms of sensible heat at daytime and latent heat at night which constitutes special response and feedback transfer process to solar radiant heat on desert area. In the meantime,the author has analyzed the changing properties of physical climate parameters in desert region according to measured data and heat balance equation of earth surface;and modeled the heat transfer process at earth-atmosphere interface.
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Key words:
- earth-atmosphere interface /
- heat flux /
- Gurbantunggut Desert
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