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 4 W/m2, and a root mean square error (RMSE) less than 11 W/m2. The correlation slope is 1.00±0.05 and the intercept is less than 15 W/m2. Thus, this equation can accurately estimate the downward long-wave radiation for climate change models.
杨汉波, 吕华芳, 胡庆芳, 雷慧闽, 杨大文. 华北平原的大气逆辐射参数化方法比较[J]. 清华大学学报（自然科学版）, 2014, 54(5): 590-595.
Hanbo YANG, Huafang LV, Qingfang HU, Huimin LEI, Dawen YANG. Comparison of parametrization methods for calculating the downward long-wave radiation over the North China Plain. Journal of Tsinghua University(Science and Technology), 2014, 54(5): 590-595.
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2014, Vol. 54 
),吕华芳,胡庆芳,雷慧闽,杨大文
