This paper theoretically studies a method of retrieving the cloud optical depth from total solar radiation and analyzes main sources of errors in the optical depth solution. 本文从理论上探讨了从全波段太阳总辐射信息反演云光学厚度的一个新方法,并分析了引起云光学厚度解的误差的主要因子。
A Theoretical Study of Retrieving Cloud Optical Depth(COD) from Total Solar Radiation 从太阳总辐射信息反演云光学厚度的理论研究
The cloud visible optical depth can be determined using cloud liquid ( ice ) water content and effective radius. 其中,云的光学厚度可通过云水含量和云粒子平均有效半径确定。
The required input to the parameterization includes precipitable water, concentration of carbon dioxide amount, ozone amount, cloud amount, cloud visible optical depth, solar zenith angle and surface albedo. 计算所需要的输入变量有:大气可降水量,二氧化碳含量,臭氧总量,云量,云的光学厚度,太阳天顶角,地表反射率。
It is shown that the heating rates of the cloud layer having optical depth 10-100 can reach 7-8 ℃ / day. The absorption of cloud droplets and aerosol is an important mechanism for increasing heating rate in cloud layer. 结果表明,光学厚度为10100的云层的加热率可达78℃/天,云滴和气溶胶的吸收作用是增加云层加热率的一个重要机制。