中国地区云对地气系统净辐射强迫的气候研究

本文利用地球辐射平衡试验（ERBE）和国际卫星云气候计划（ISCCP）提供的地气系统行星反射率，长波射出辐射（OLR）和云量资料，计算出中国地区年、月总云量对地气系统净辐射的强迫，分别讨论了其与总云量及地气系统晴天净辐射的关系。结果表明：地气系统净辐射云强迫与总云量有较好的抛线物关系，各月净辐射云强迫与地气系统晴天净辐射的曲线相关也很明显，如以曲线上净辐射云强迫为零时的晴天净辐射值代表各月曲线位置，则该值随天文辐射作规律性季节变化。地气系统净辐射云强迫的地理分布与总云量及地气晴天净辐射分布有关，其在各地的年变化则主要由天文因素及雨季进行退决定。

CLIMATOLOGICAL STUDY ON EFFECT OF CLOUDON THE EARTH-ATMOSPHERIC NETRADIATIVE FORCING IN CHINA

The effect of monthly total cloud amount on the net cloud radiative forcing (NCRF) in the earth-atmospheric system in China is studied using the satellite climatology dataset from ERBE and ISCCP. The relationship between NCRF and the cloud amount as well as net radiation is presented. It Is found that there is a clear parabolic relationship between the cloud amount and NCRF. The similar result is also true for the earth-atmospheric net clear-sky radiation and NCRF. If the values of clear-sky net radiation corresponding to zero value of NCRF are considered to be representatives of the curve position in each month, they show regular seasonal variation with the astronomical radiation. The geographical distribution of NCRF in the earth-atmospheric system is related to those of cloud amount and clear net radiation,its annual variation in different region is mainly dominated by the astronomical factor and the shift of rain belt.