中高层大气临边红外辐射的LTE与non-LTE模拟对比

摘要/Abstract

摘要： 利用战略高空辐亮度代码(Strategic high-altitude radiance code, SHARC) 和通用大气辐射传输代码
(Combined atmospheric radiative transfer, CART) 模拟分析中高层大气临边红外辐射的算法适用范围。
通过模拟结果的对比,初步验证了CART临边模式的有效性。模拟结果表明,在主要的红外波段上,至少45 km以
下的平流层区域内临边红外辐亮度的计算都可以采取局域热力学平衡模式(Local thermodynamics
equilibrium, LTE);不同的红外波段在不同的大气条件下,需要采用非局域热力学平衡模式
(Non-local thermodynamics equilibrium, non-LTE)的高度不同,其中15 $\mu$m波段在至少80 km的切点
高度以下都可以使用LTE模式模拟,但是对于CO$_2$ 4.3 $\mu$m带主导的3$\sim$5 $\mu$m波段和O$_3$ 9.6 $\mu$m带
主导的8$\sim$12 $\mu$m波段,在中间层的多数区域内就必须采用non-LTE模式。

关键词: 大气光学, 中高层大气, 红外辐射, 局域热平衡, 非局域热平衡

Abstract: The simulation algorithms for limb infrared radiation in the middle and upper atmosphere are
investigated using strategic high-altitude radiance code (SHARC) and combined atmospheric
radiative transfer (CART) model. The results confirm the availability of CART limb model
preliminarily. The comparison shows that local thermodynamics
equilibrium(LTE) model is effective under at least 45 km
tangent altitude for the main limb infrared radiance simulation, while non-local thermodynamics equilibrium(non-LTE) model
should be applied starting from different altitudes for the different infrared bands
and atmospheric conditions. For 15 $\mu$m band, LTE model can be effective under at
least 80 km tangent altitude; but for 4.3 $\mu$m band and 9.6 $\mu$m band, non-LTE model
should be applied about above the stratosphere.

Key words: atmospheric optics, middle and upper atmosphere, infrared radiation, local thermodynamics
equilibrium, non-local thermodynamics equilibrium

中图分类号:

O432.1

刘栋1,2,戴聪明1*,魏合理1,2. 中高层大气临边红外辐射的LTE与non-LTE模拟对比[J]. 大气与环境光学学报.

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