摘要
论文基于太阳辐射参数化传输模型,结合MODIS每日两次的大气产品和DEM,构建了太阳短波辐射分布式模型,对青藏高原2007年的太阳直接辐射、散射辐射与总辐射分布状况进行了模拟,并利用研究区站点实测值对模型精度进行了验证,其中日值数据直接辐射的相关性分别为0.72(拉萨)和0.82(格尔木),散射辐射分别为0.71(拉萨)和0.70(格尔木),总辐射相关性大都在0.70以上;旬值数据实测值与模拟值的相关性大都在0.90以上。模拟结果表明:实际天气情形下青藏高原年平均直接辐射量为4 244 MJ/m2,年平均散射辐射量为2 348 MJ/m2,年平均总辐射量为6 592 MJ/m2。直接辐射与总辐射的空间分布主要受纬度地带性与垂直地带性的影响,且地形对地表短波辐射的影响大于纬度的影响;散射辐射的空间分布主要取决于当地的地形起伏与大气状况。
The objective of this paper is to combine a parametric model for atmospheric attenuating effects with the topographic influences and the 3D effects of the cloud to simulate daily solar radiation over the Tibetan Plateau in 2007. Of the 11 groups of measured data, only two measured direct and diffuse solar radiation were used to evaluate the model. The determination coefficients of direct solar radiation were R2 = 0.72 （Lhasa） and 0.82 （ Golmud）, while R2 for diffuse solar radiation were 0.71 （Lhasa） and 0.70 （Golmud） ,respectively. However, the determination coefficient for global solar radiation was larger than 0. 70. The coefficient of every 10-day data between measured and modeled data was larger than 0. 90. The possible explanation for the biases was the spatial resolution of the observed data was not consistent with the calculated ones ; further more, the biases of the MODIS atmospheric products had introduced some errors. The average an- nual direct solar radiation of the Tibetan Plateau was 4244 MJ/m2, while the diffuse solar radiation was 2348 MJ/m2. The spatial distribution of direct and global solar radiation was mainly af- fected by the terrain rather than the latitude, while the diffuse solar radiation was mainly affected by the local terrain and the atmosphere. The monthly maximum direct solar radiation was in May, while the monthly maximum diffuse solar radiation was in June and July.
出处
《自然资源学报》
CSSCI
CSCD
北大核心
2010年第5期811-821,共11页
Journal of Natural Resources
基金
中国科学院方向项目(kzcx2-yw-308)
国家自然科学基金项目(40771172
40901223)
关键词
DEM
青藏高原
短波辐射
MOD|S
DEM
Tibetan Plateau
solar radiation
MODIS atmospheric products
