摘要
利用全天空红外测云系统(WSICMS)获得的全天空红外辐射图像,研究了云量和云的地面辐射强迫的计算方法。将全天空红外辐射图像中的辐射值和天顶角绘制散点图,从各天顶角的最小辐射值中提取晴空辐射,计算云量和云的辐射强迫,分析云的地面辐射强迫和云量的关系。结果表明:所获得的云分布图像与实际天空相吻合,准确性比较高;8～14μm波段云的地面辐射强迫与云量呈非线性关系,与其它资料的研究结果具有很好的一致性,证明了利用全天空红外测云系统进行云辐射强迫研究的可行性和准确性。
The calculating methods of cloud cover and cloud surface radiative forcing based on the whole sky infrared image derived from WSICMS are analyzed in this paper. The scatter plots of the whole sky infrared radiation with the zenith angle are used to obtain the minimum radiation at each angle, by which the clear sky radiation and cloud cover can be calculated, and then the cloud cover and cloud surface radiative forcing are calculated and relationships between cloud surface radiative forcing and cloud cover are discussed. The results show that the cloud-flagged image are consistent well with the actual sky;there is a nonlinear relationship between the cloud surface radiative forcing at 8-14 μm and cloud cover, and similar results have derived from other data. It proves that the feasibility and accuracy of the study methods.
出处
《气象水文海洋仪器》
2012年第2期1-5,共5页
Meteorological,Hydrological and Marine Instruments
