利用多模传输理论求解块状云的辐射特征

An Attempt to Study the Three-Dimensional Radiative Properties of Cloud Using the Theory of Multimode Transfer

实际云层在水平与垂直方向都是不均匀的 ,但为了便于计算 ,绝大多数关于云辐射的理论模式 ,都采用平面平行模式。到目前为止 ,解决三维空间辐射传输问题的方法仍然不多。一般采用统计方法和二流近似法 ,但这两种方法分别在计算机时和计算精度上受到限制。作者在三维多模传输理论与辐射传输计算程序软件包———DISORT的基础上 ,发展出计算三维孤立云块多次散射过程的一套程序 (MM DISORT) 。

Clouds are the major contributor to modulate the energy balance of the earth-atmosphere system. Observations have confirmed that almost no cloud field on Earth are horizontally and vertically uniform. But most studies on cloud-radiation are based on the assumption of plane-parallel radiative transfer. Methods for modeling radiative transfer in inhomogeneous three-dimensional media are still few. This paper gives an overview of the theory of 3D multimode radiative transfer, and developed a code based on this theory and DISORT(the most common code of 1D radiative transfer) to investigate the influence of the sides of the finite clouds on cloud shortwave absorption.