Long-wave radiative analysis of cloudy scattering atmospheres using a net exchange formulation
Long-wave radiative analysis of cloudy scattering atmospheres using a net exchange formulation
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使用净交换公式对多云散射大气进行长波辐射分析
DOI：
10.1016/j.atmosres.2004.03.017
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发表时间：
2004
影响因子：
5.5
通讯作者：
Stéphane Blanco
中科院分区：
文献类型：
--
作者：
V. Eymet;Jean;P. Ricchiazzi;R. Fournier;Stéphane Blanco
净交换公式 (NEF) 是通常辐射传输方程的替代方案。它是由 Green 于 1967 年提出的 [Q. J.R.Meteorol。苏克。 93 (1967) 371] 大气科学和 Hottel [H.C.霍特尔，A.F.萨罗菲姆。辐射传输麦格劳希尔，纽约，1967 年]用于工程科学。到目前为止，NEF 仅在极少数情况下用于大气研究。最近，我们基于火星 GCM 的公式开发了长波辐射代码。在这里，我们将展示通过基于 NEF 的蒙特卡罗方法获得的地球大气结果。在该方法中，不再涉及通量。基本变量是每对大气层（i，j）之间的净交换率（NER），即i发射并被j吸收的辐射功率减去j发射并被i吸收的辐射功率。 NER 矩阵的图形表示突出了主导大气辐射收支的辐射交换，使人们能够很好地了解辐射交换。将显示具有中纬度夏季和亚北极冬季温度剖面的晴空大气以及具有三种不同类型云的相同大气的结果。还将分析散射对长波辐射交换的影响。
The Net Exchange Formulation (NEF) is an alternative to the usual radiative transfer equation. It was proposed in 1967 by Green [Q. J. R. Meteorol. Soc. 93 (1967) 371] for atmospheric sciences and by Hottel [H.C. Hottel, A.F. Sarofim. Radiative Transfer McGraw Hill, New York, 1967] for engineering sciences. Until now, the NEF has been used only in a very few cases for atmospheric studies. Recently we have developed a long-wave radiative code based on this formulation for a GCM of the Mars planet. Here, we will present results for the Earth atmosphere, obtained with a Monte Carlo Method based on the NEF. In this method, fluxes are not addressed any more. The basic variables are the net exchange rates (NER) between each pair of atmospheric layer (i, j), i.e. the radiative power emitted by i and absorbed by j minus the radiative power emitted by j and absorbed by i. The graphical representation of the NER matrix highlights the radiative exchanges that dominate the radiative budget of the atmosphere and allows one to have a very good insight of the radiative exchanges. Results will be presented for clear sky atmospheres with Mid-Latitude Summer and Sub-Arctic Winter temperature profiles, and for the same atmospheres with three different types of clouds. The effect of scattering on long-wave radiative exchanges will also be analysed.