利用MODIS数据直接估算晴空区干旱与半干旱地表净辐射通量  

Estimation of the Net Radiation over Arid and Semiarid Areas Only Using MODIS Data for Clear Sky Days

作　　者：叶晶[1,2,3] 刘辉志[2] 李万彪[1,2] 蔡双彭 李宇明 曹丽霞 

机构地区：[1]北京大学物理学院大气与海洋科学系 [2]中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室 [3]解放军95871部队 [4]解放军61741部队

出　　处：《北京大学学报（自然科学版）》2010年第6期942-950,共9页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室开放课题(LAPC-KT-2008-01)资助

摘　　要：通过对地表处向下短波辐射、向上短波辐射、向下长波辐射和向上长波辐射通量的4个能量收支分量的参数化,利用多个MODIS陆地和大气产品,给出一个不需要地面观测气象数据,仅用卫星遥感数据来计算晴空条件下干旱与半干旱地表上的净辐射通量计算方案。方案计算了2003年7—10月、2004年7—11月及2005年6—10月期间退化草地89个晴空数据和农田85个晴空数据,与地面观测数据对比表明方案能有效计算净辐射通量,均方根误差达到47.5和49.2W/m2,优于国内外同类研究的精度。Based on the parameterization of downward shortwave radiation, upward shortwave radiation, downward longwave radiation and upward longwave radiation above the surface, a scheme is proposed to estimate instantaneous net radiation over arid and semiarid areas for clear sky days using only remote sensing observations. The scheme attempts to eliminate the need for ground meteorology data as the estimates of land surface radiation balance, by using various land and atmospheric data products available from moderate resolution imaging spectroradiometer（MODIS）. The preliminary results, using 89 cases over the degraded grassland and 85 cases over the farmland during July to October in 2003, July to November in 2004 and June to October in 2005, show good agreement with ground-based observations, with the root mean square error of 47.5 and 49.2 W/m^2 respectively, which have better accuracies than the other similar studies.

关 键 词：MODIS 农田 退化草地 干旱与半干旱 净辐射 

分 类 号：P422.2[天文地球—大气科学及气象学]