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arXiv 1902.08515astro-ph.EPphysics.ao-ph
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用净交换公式分析多云散射大气的长波辐射

Longwave radiative analysis of cloudy scattering atmospheres using a Net Exchange Formulation

V. Eymet, J. L. Dufresne, P. Ricchiazzi, S. Blanco

摘要:

净交换公式(NEF)是通常的辐射转移方程的替代。1967年Green [1]和Hottel [2]分别为大气科学和工程科学提出了这一概念。到目前为止,NEF仅在极少数情况下用于大气研究。最近,我们已经开发了一个长波辐射代码的基础上制定的GCM的火星行星。在这里,我们将介绍基于NEF的蒙特卡罗方法获得的地球大气结果。在该方法中,不再处理通量。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,并允许人们对辐射交换有很好的了解。结果将被提出的晴空大气与中纬度夏季和亚北极冬季温度廓线,并为相同的大气与三种不同类型的云。还将分析散射对长波辐射交换的影响。

英文摘要:

The Net Exchange Formulation (NEF) is an alternative to the usual radiative transfer equation. It was proposed in 1967 by Green [1] for atmospheric sciences and by Hottel [2] for engineering sciences. Until now, the NEF has been used only in a very few cases for atmospheric studies. Recently we have developped a longwave 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 longwave radiative exchanges will also be analysed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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