山地天文辐射的地形影响与空间尺度效应研究  

Influences of Various Local Topographic Factors on Astronomical Radiation of Mountain and Its Spatial Scale Effect in Mountainous Region

作　　者：姜创业[1] 孙娴[1] 王娟敏[1] 王式功[2] 

机构地区：[1]陕西省气候中心,陕西西安710015 [2]兰州大学大气科学学院,甘肃兰州730000

出　　处：《高原气象》2010年第5期1230-1237,共8页Plateau Meteorology

基　　金：国家科技部公益性行业(气象)科研专项(GYHY201006036);国家科技支撑计划项目(2007BAC29B03)共同资助

摘　　要：基于1∶25×104数字高程模型数据,依据起伏地形下天文辐射分布式模型算法,研究了陕西山地天文辐射空间分布规律,详细分析了地形因子对天文辐射的影响规律;同时,从不同的DEM分辨率和不同地貌类型两个方面探讨了天文辐射的空间尺度效应。结果表明:陕西天文辐射总量随着纬度的升高呈由南向北降低的趋势;局地地形因子对天文辐射的影响随季节、纬度、坡度及坡向等因素而变;同时山地天文辐射的空间尺度效应在地势起伏较大的山区和高原地区表现尤为明显。Using a distributed model with rising and falling terrains,the spatial distribution of solar radiation resource over the mountainous regions in Shaanxi is investigated and influences of various local topographic factors on short-wave radiation are discussed based on the 1∶25×10^4 DEM data.Moreover,the effects of spatial scale on the solar radiation under different DEM resolutions and different geomorphic features are also analyzed.The result shows that： The astronomical radiation in Shaanxi is reduced from south to north with latitude.The influences of local topographic factors on astronomical radiation were variation with season,latitude,slope and aspect;meanwhile,the spatial scale effects of astronomical radiation in the mountainous region and plateau of rising and falling terrains are more obvious.

关 键 词：山地 天文辐射 分布式模型 局地地形因子 空间尺度效应 

分 类 号：P422.9[天文地球—大气科学及气象学]