摘要
大气逆辐射对地表能量平衡及蒸发等方面有重要影响。为准确计算大气逆辐射,该文基于6种常用的晴空大气发射率计算公式并根据日太阳辐射率(太阳辐射的实际值与理论值的比值)对云的影响进行修正,建立大气逆辐射的参数化方法;并将6种方法与位于华北平原的位山生态水文实验站与栾城农业生态系统实验站的实测数据进行对比。结果表明:Marshunova公式具有最好的模拟精度,确定系数(R2)高于0.97,平均偏移误差(MBE)小于4W/m2,均方根误差(RMSE)小于11W/m2,尤其是日辐射计算值与观测值的线性回归方程的斜率在1.00±0.05范围内,截距小于15W/m2,能精确模拟气候变化下的大气逆辐射。
The downward long-wave radiation has an important impact on the surface energy balance and surface evaporation.This paper compares six methods for estimating the downward long-wave radiation.These formulae modify the atmospheric emissivity for clear skies for cloudy skies according to the daily solar radiation ratio（defined as the ratio of the measured incoming solar radiation to the solar radiation received with clear skies）.The estimates from these methods are compared with measurements from the Weishan Echo-Hydrology Experimental Station in Shandong Province and the Luancheng Agro-Ecosystem Experimental Station in Hebei Province in the North China Plain.The results show that the Marshunova equation gives the best estimates with a correlation coefficient（R2）larger than 0.97,a mean bias error（MBE）less than 4W/m2,and a root mean square error（RMSE）less than 11W/m2.The correlation slope is 1.00±0.05and the intercept is less than 15W/m2.Thus,this equation can accurately estimate the downward long-wave radiation for climate change models.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第5期590-595,共6页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(51209117
51379098
51109222)
北京高等学校青年英才计划项目(YETP0080)
