A set of equations for full spectrum and 8- to 14-μm and 10.5- to 12.5-μm thermal radiation from cloudless skies
A set of equations for full spectrum and 8- to 14-μm and 10.5- to 12.5-μm thermal radiation from cloudless skies
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DOI：
10.1029/wr017i002p00295
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发表时间：
1981-04
影响因子：
5.4
通讯作者：
S. Idso
中科院分区：
文献类型：
--
作者：
S. Idso
在亚利桑那州菲尼克斯进行了一项综合实验，涉及监测全光谱热辐射以及 8 至 14 μm 和 10.5 至 12.5 μm 亚子区域内包含的通量部分。还监测表面空气温度（T0）和蒸气压（e0）。对数据的分析确定了无云天空的水蒸气相关热发射率 (ϵ) 变化的来源，这是由于水二聚体（通过弱氢键连接在一起的水分子对）的大气浓度变化所致。因此，基于该物理模型，针对 10.5 至 12.5 µm 和 8 至 14 µm 波段以及全热谱中大气的有效发射率开发了新方程 ((15)–(17))。方程 (17) 被证明比之前试图模拟这种现象的方程有了显着的改进。
A comprehensive experiment was conducted at Phoenix, Arizona, involving the monitoring of full spectrum thermal radiation and those fractions of that flux that are contained within the 8- to 14-μm and 10.5- to 12.5-μm subrogions. Also monitored were surface air temperature (T0) and vapor pressure (e0). Analyses of the data established the source of water vapor associated thermal emittance (ϵ) variations of the cloudless sky as being due to the variable atmospheric concentration of water dimers—pairs of water molecules linked together by weak hydrogen bonds. New equations ((15)–(17)) based on this physical model were thus developed for the effective emittance of the atmosphere in both the 10.5- to 12.5-µm and 8- to 14-μm wavebands, as well as for the full thermal spectrum. Equation (17) was then shown to be a significant improvement over previous equations that have attempted to model this phenomenon.