Abstract

The paper describes a block for calculating the Earth’s natural atmospheric radiation in the IR range developed for the general circulation model simulating the lower and middle atmosphere. This block uses the new parametrization of molecular absorption in the frequency range from 10 to 2000 cm⁻¹ at the altitude ranging from the Earth’s surface to 76 km. The algorithm for constructing this parametrization takes into account the change in the gas composition of the atmosphere with altitude and has some other significant advantages. In addition, for the numerical solution of the radiation transfer equation, the discrete ordinate method and the computational zenith angle grid with the step of about nine degrees are used. The results of the line-by-line calculations of the Earth’s internal atmospheric radiation field are compared with the results of the calculations performed using parametrization, and it is shown that the presented parametrization is accurate in the lower and middle atmosphere both in the absence of clouds and in the presence of cloud layers with a significant optical thickness.

中文翻译：

---

使用地球低层和中层大气的一般环流模型计算自然大气辐射

摘要

本文描述了一个用于计算红外范围内地球自然大气辐射的模块，该模块是为模拟中低层大气的普通循环模型开发的。此模块在10到2000 cm ^-1的频率范围内使用了分子吸收的新参数化在从地球表面到76公里的高度。构造此参数化的算法考虑了大气中气体成分随海拔高度的变化，并具有其他一些明显的优势。另外，对于辐射传递方程的数值解，使用离散纵坐标法和以大约九度为步长的计算天顶角网格。将地球内部大气辐射场的逐行计算结果与使用参数化进行的计算结果进行了比较，结果表明，在没有大气层的情况下，所提出的参数化在低层和中层大气中都是准确的云层并且存在具有明显光学厚度的云层。