复杂地形任意天气情形下太阳直接辐射量模拟

摘要/Abstract

摘要： 以太阳辐射传输参数化模型为基础,结合MODIS影像两次白天的云产品和水汽产品及DEM,构建了复杂地形任意天气情形下每日太阳直接辐射量模型。选取代表不同气候类型与地形起伏状况的3个典型站点（拉萨、北京、额济纳旗）,以2007年每日实测值对模拟结果进行了验证,其相关系数分别为0.77、0.77和0.85。研究表明:有云天气下,云是影响地表太阳直接辐射数量和空间分布的主要因子;模型对时间步长不敏感。引起误差的原因主要是MODIS云产品的时空分辨率较低以及云的3D效应导致模拟的困难,对地形起伏较大地区,小比例尺的DEM也会导致较大的误差,同时实测值与模拟值的空间尺度不匹配也引起了一定误差。

关键词: 太阳直接辐射, 任意天气, 起伏地形, DEM

Abstract: The solar radiation receipt at the Earth’s surface is an important parameter in modeling ecosystem dynamics and climate change. The objective of this paper is to combine a parametric model of atmospheric attenuating effects with the topographic influence and the 3D effects of cloud to simulate daily direct solar radiation in cloudy sky and complex terrain conditions. The source data are MODIS TERRA/AQUA daily atmospheric products and SRTM DEM data which can be downloaded from the website freely. Three groups of measured daily direct solar data acquired in 2007 were used to evaluate the model, and the determination coefficient is R2=0.77(Lhasa), 0.77(Beijing), and 0.85(Erjinaqi), respectively. It indicated that cloud is a primary factor which controls the amount and the distribution of solar radiation, and the model is not sensitive to variations of time steps due to lack of corresponding time scale of cloud parameters. The errors are mainly caused by coarse spatial and temporal resolution of cloud products including the 3D effects of cloud. The spatial resolution of the observed data is also not consistent with the calculated ones. Topography is an important factor affecting model results over undulating surfaces such as Lhasa and Ejinaqi.

Key words: direct solar radiation, cloudy sky, complex terrain, DEM

中图分类号:

P422

张海龙;刘高焕;姚玲;解修平. 复杂地形任意天气情形下太阳直接辐射量模拟[J]. 中国沙漠, 2010, 30(6): 1469-1476.

ZHANG Hai-long;LIU Gao-huan;YAO Ling;XIE Xiu-ping. Direct Solar Radiation Simulation in All-weather and Complex Terrain Conditions[J]. JOURNAL OF DESERT RESEARCH, 2010, 30(6): 1469-1476.

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