Effect of OH emission on the temperature and wind measurements derived from limb-viewing observations of the 1.27 µm O 2 dayglow

Wu, Kuijun; He, Weiwei; Feng, Yutao; Xiong, Yuanhui; Li, Faquan

The inline-formulaO2(a1Δg) emission near 1.27 inline-formulaµm is well-suited for remote sensing of global wind and temperature in near-space by limb-viewing observations to its bright signal and extended altitude coverage. However, vibrational–rotational emission lines of the inline-formulaOH dayglow produced by the hydrogen–ozone reaction (inline-formula M6inlinescrollmathml chem normal H + normal O normal 3 normal OH normalRadical • + normal O normal 2 96pt13ptsvg-formulamathimg3168af144415875d51f2b9db7eac2818 amt-13-1817-2020-ie00001.svg96pt13ptamt-13-1817-2020-ie00001.png ) overlap the infrared atmospheric band emission (inline-formulaa1ΔgX3Σg) of inline-formulaO2. The main goal of this paper is to discuss the effect of OH emission on the wind and temperature measurements derived from the 1.27 inline-formulaµminline-formulaO2 dayglow limb-viewing observations. The inline-formulaO2 dayglow and OH dayglow spectrum over the spectral region and altitude range of interest is calculated by using the line-by-line radiative transfer model and the most recent photochemical model. The method of four-point sampling of the interferogram and sample results of measurement simulations are provided for both inline-formulaO2 dayglow and OH dayglow. It is apparent from the simulations that the presence of OH dayglow as an interfering species decreases the wind and temperature accuracy at all altitudes, but this effect can be reduced considerably by improving OH dayglow knowledge.

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Wu, Kuijun / He, Weiwei / Feng, Yutao / et al: Effect of OH emission on the temperature and wind measurements derived from limb-viewing observations of the 1.27 µm O2 dayglow. 2020. Copernicus Publications.

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