Spectroscopic study of the seasonal variation of carbon monoxide vertical distribution above Kitt Peak
Spectroscopic study of the seasonal variation of carbon monoxide vertical distribution above Kitt Peak
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基特峰上方一氧化碳垂直分布季节变化的光谱研究
DOI：
10.1029/94jd02387
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发表时间：
1995
影响因子：
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通讯作者：
C. Rinsland
中科院分区：
文献类型：
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作者：
N. Pougatchev;C. Rinsland
本文提出了一种从地基高分辨率红外太阳光谱反演一氧化碳（CO）垂直分布元素的方法。该方法是基于这样一个事实，即通过非线性最小二乘光谱拟合技术检索的总柱量取决于假定的先验轮廓的形状，并且这种依赖性是吸收线强度和过渡的较低状态能量的函数。在2057和2159 cm−1之间选择了四条CO谱线，并在合成光谱上对该方法进行了测试。该方法可以反演两层大气（地面至400 mbar和400 mbar至大气顶部）的CO总柱含量和平均浓度，精度分别为1%和小于10%。本文分析了1982 - 1993年在基特峰观测到的太阳光谱。两层CO总柱和平均浓度呈现不对称的季节变化，（1.1-2.1）× 1018分子cm-2，顶层（50-80）ppbv，底层（80-160）ppbv，精度分别为1%、3%和6%;春季最大值和夏末最小值。
A method to retrieve elements of the carbon monoxide (CO) vertical distribution from ground-based high-resolution infrared solar spectra has been developed. The method is based on the fact that the total column amount retrieved by nonlinear least squares spectral fitting techniques depends on the shape of the assumed a priori profile and this dependence is a function of the absorption line intensity and the lower state energy of the transition. Four CO lines between 2057 and 2159 cm−1 have been selected and the method has been tested on synthetic spectra. The CO total column content and average concentrations in two atmospheric layers (surface to 400 mbar and 400 mbar to the top of the atmosphere) can be retrieved with precisions of about 1% and less than 10%, respectively. Solar spectra recorded at Kitt Peak from 1982 to 1993 have been analyzed. The CO total column and the average concentration in the two layers show an asymmetrical seasonal cycle with extreme values of (1.1–2.1) × 1018 molecules cm−2, (50–80) parts per billion by volume (ppbv) in the top layer and (80–160) ppbv in the bottom layer, and precisions of 1, 3, and 6%, respectively; a spring maximum and late summer minimum are observed.
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