白昼净辐射通量的改进方法研究  

IMPROVED METHOD FOR THE CALCULATION OF DAILY NET RADIATION

作　　者：安卫辉[1] 张友静[1,2] 陈静欣[3] 李晓宁[1] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [3]江苏省测绘产品质量监督检验站,江苏南京210013

出　　处：《山东农业大学学报（自然科学版）》2013年第3期415-422,共8页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)(2010CB951101);水利部公益性行业科研专项项目(编号201101024)

摘　　要：以山东半岛为研究区,利用MODIS产品数据和气象站点数据,采用净辐射通量遥感模型,计算站点瞬时净辐射通量,并扩展得到白昼净辐射通量;利用地面气象站点实测数据,与计算结果进行对比分析。针对遥感净辐射通量存在较大的系统偏差以及在NDVI低值区域误差较大的问题,提出白昼净辐射通量计算的改进方法和依据NDVI值分段修正净辐射通量的方法。结果表明:在计算白昼地表净辐射通量时,缩短日照时数,使用N-2代替理论日照时数N进行地表净辐射通量的扩展,系统误差减小,在该区域有较好的结果。在冬季,将NDVI<0.3低值区域地表比辐射率增加3%,与实测数据相关性加强,两站点截距改善分别为54.58与27.03;并采用郑州站点数据进行验证和分析,说明改进方法可以应用到类似地区。Based on net radiation model, the net radiation and daily net radiation were calculated using MODIS data and meteorological observed data in Shandong peninsula. And the numerical result was compared with the observed data. Aiming at the large systematic bias in daily net radiation, we improved the input parameters in the net radiation model and put forward a method to modify the net radiation based on the NDVI value. The resuits show that： the systematic bias could be reduced by using N -2 instead of the sunshine- length （N） when we were calculating the daily net radiation. In winter, increasing the land surface emissivity to 1.03 times the original value when the NDVI value less than 0.3, the correlation between the calculated net radiation and the observed data could be improved, the intercept of Jinan and Fushan station changed 54.58 and 27.03. The validation results in Zhengzhou station demonstrated the method＇s validity and accuracy.

关 键 词：MODIS 净辐射通量 地表比辐射率 山东半岛 改进方法 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] P412.14[自动化与计算机技术—计算机科学与技术]