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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-755
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Aug 2018

Research article | 06 Aug 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

New insights into OH airglow modelling to derive night-time atomic oxygen and atomic hydrogen in the mesopause region

Tilo Fytterer1, Christian von Savigny2, Martin Mlynczak3, and Miriam Sinnhuber1 Tilo Fytterer et al.
  • 1Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, 76344, Germany
  • 2Institute of Physics, University of Greifswald, Greifswald, 17489, Germany
  • 3NASA, Langley Research Center, Hampton, Virginia, 23681-2199, USA

Abstract. An OH airglow model was developed to derive night-time atomic oxygen (O(3P)) and atomic hydrogen (H) from satellite OH airglow observations in the mesopause region (~75–100km). The OH airglow model is based on the zero dimensional box model CAABA/MECCA-3.72f and was empirically adjusted to fit four different OH airglow emissions observed by the satellite/instrument configuration TIMED/SABER at 2.0μm and at 1.6μm as well as measurements by ENVISAT/SCIAMACHY of the transitions OH(6-2) and OH(3-1). Comparisons between the Best fit model obtained here and the satellite measurements suggest that deactivation of vibrationally excited OH(v) via OH(v7)+O2 might favour relaxation to OH(v'5)+O2 by multi-quantum quenching. It is further indicated that the deactivation pathway to OH(v'=v5)+O2 dominates. The results also provide general support of the recently proposed mechanism OH(v)+O(3P)OH(0v'v5)+O(1D) but suggest slower rates of OH(v=7,6,5)+O(3P). Additionally, deactivation to OH(v'=v5)+O(1D) might be preferred. The profiles of O(3P) and H derived here are plausible between 80km and 95 km. The values of O(3P) obtained in this study agree with the corresponding TIMED/SABER values between 80km and 85km, but are larger from 85 to 95km due to different relaxation assumptions of OH(v)+O(3P). The H profile found here is generally larger than TIMED/SABER H by about 30–35% from 80 to 95km, which might be attributed to too high O3 night-time values.

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A model was developed to derive night-time atomic oxygen (O(3P)) and atomic hydrogen (H) from satellite observations in the altitude region between 75 km and 100 km. Comparisons between the Best fit model and the measurements suggest that chemical reactions involving O2 and O(3P) might occur different than usually assumed in literature. This considerably affects the derived abundances of O(3P) and H, which in turn might influence air temperature and winds of the whole atmosphere.
A model was developed to derive night-time atomic oxygen (O(3P)) and atomic hydrogen (H) from...
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