摘要

利用我国西北干旱区陆气相互作用试验资料和卫星遥感资料，选择戈壁、沙漠、黄土塬等典型裸土下垫面，比较分析这些下垫面太阳总辐射、反射辐射、地表向上和向下长波的特征，总的地表反射率和地表发射率特征；比较分析这些下垫面太阳分光辐射包括紫外、可见光、红外辐射及其相应的地表反射辐射和反射率的变化特征；选择几个主要的陆面模型，比较研究其地表反射率和地表发射率的参数化方案，以近地层大气和地表过程的观测资料作驱动，检验主要陆面模型中现有地表反射率和地表发射率参数化方案在这些地域的模拟能力，分析影响地表反射率和地表发射率的主要因子及其不同下垫面这些因子的重要程度；根据研究结果进行地表辐射特别是太阳紫外、可见光和红外辐射的观测补充试验，改进或建立新的适合这些地区的分光和总的地表反射率和发射率的参数化方案，利用陆面模型研究其对地表能量和水分交换的影响。

英文摘要

By using the land-atmosphere interaction experiment data and satellite remote sensing data in NW China, we will select the Gobi, desert and loess Mesa typical underlying surface, and analyze the characteristics of the surface global solar radiation, reflected radiation, the surface up and downlong-wave characteristics, the total surface albedo and surface emissivity on these surfaces. We will research the solar spectral radiation including ultraviolet, visible light, infrared radiation its corresponding reflection of the surface radiation and reflectivity variation on these surfaces. Several major land surface models will be selected to compare and study the surface albedo and surface emissivity parameterization scheme. By using the data of the surface atmosphere and land process as a driver, test the simulation capabilities of several land surface model on the surface albedo and surface emissivity in these underlying surface,and analyze the main factors to influence the surface albedo and surface emissivityand its importance.The field experiment will be run on the solar ultraviolet, visible and infrared radiation to improve or create new surface albedo and emissivity parameterization scheme.The impact of the new scheme on the surface energy and water exchange will be researched.