【摘要】 以物理过程分析为基础,根据野外实测资料设计了青藏铁路沿线地表和路基表面热力学模式中的大气辐射参数化方案,对直接太阳辐射、大气散射辐射、大气向下长波辐射参数进行处理,得到了较好的结果.在无云大气条件下,对直接太阳辐射透过率和大气散射辐射以太阳天顶角进行参数化;对大气向下长波辐射以大气等效辐射率及气温进行参数化;在云天条件下,基于晴阴比的云量参数化和基于气候资料的云天系数参数化都各有较好的效果.对土壤热通量的参数化方法和拖曳系数的取值问题进行了讨论,更完善的方法还有待于与实验测量工作相结合.更多还原

【Abstract】 Based on the field observation data,the atmospheric radiation flux parameterization schemes in the thermo-dynamic model of the ground surface and embankment surface along the Qinghai-Tibet railway are made and used to process the solar direct radiation flux,atmospheric diffuse radiation flux and downward long-wave radiation flux,and the results are good.In the cloud free condition,the parameterization schemes are made for the direct solar radiation flux with permeation ratio and for atmospheric diffuse radiation flux with solar zenith angle,and for the atmospheric downward long-wave radiation flux with atmospheric equivalent emissivity and air temperature.In the cloudy condition,there are the better effect of the cloud amount parameterization scheme based on the cloud cover ratio for generic instantaneous circs and the cloud coefficient parameterization scheme based on the climate data for climatic mean circs.The parameterization for the soil heat flux and the surface drag coefficient are discussed,and the more perfect method needs to combine further with measure experiments.更多还原