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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-244
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-244
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 17 Jun 2019

Submitted as: research article | 17 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Effect of OH radiance on the temperature and wind measurements derived from limb viewing observations of the 1.27 μm O2 dayglow

Kuijun Wu1, Weiwei He2, Yutao Feng3, Yuanhui Xiong1, and Faquan Li1 Kuijun Wu et al.
  • 1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China
  • 2City College, Wuhan University of Science and Technology, Wuhan, Hubei, 430083, China
  • 3Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China

Abstract. The O2(a1Δg) emission near 1.27 μm is well-suited for remote sensing of global wind and temperature in near-space by limb-viewing observations due to its bright signal and extended altitude coverage. However, vibrational-rotational emission lines of the OH dayglow produced by the Hydrogen-Ozone reaction (H + O3 → OH* + O2) overlap the infrared atmospheric band emission (a1Δg → X3Σg) of O2. The main goal of this paper is to discuss the effect of OH radiance on the wind and temperature measurements derived from the 1.27 μm O2 dayglow limb-viewing observations. The O2 dayglow and OH radiance 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 O2 dayglow and OH radiance. It is apparent from the simulations that the presence of OH radiance as an interfering species decreases the wind and temperature accuracy at all altitudes, but this effect can be reduced obviously by improving OH radiance knowledge.

Kuijun Wu et al.
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Short summary
The 1.27 μm O2 dayglow is well-suited for remote sensing in near-space. The main goal of this paper is to discuss the effect of OH radiance on the wind and temperature measurements derived from limb-viewing observations of the O2 dayglow. It is apparent from the simulations that the presence of OH radiance as an interfering species decreases the wind and temperature accuracy at all altitudes, but this effect can be reduced obviously by improving OH radiance knowledge.
The 1.27 μm O2 dayglow is well-suited for remote sensing in near-space. The main goal of this...
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