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Discussion papers
https://doi.org/10.5194/acp-2019-417
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-417
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 May 2019

Research article | 13 May 2019

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

Global nighttime atomic oxygen abundances from resampled GOMOS hydroxyl airglow measurements in the mesopause region

Qiuyu Chen1,2, Martin Kaufmann1,2, Yajun Zhu1, Jilin Liu1,2, Ralf Koppmann2, and Martin Riese1,2 Qiuyu Chen et al.
  • 1Institute for Energy and Climate Research, Forschungszentrum Jülich, Jülich, Germany
  • 2Institute for Atmospheric and Environmental Research, University of Wuppertal, Wuppertal, Germany

Abstract. This paper presents a new dataset of nighttime atomic oxygen density [O], derived from OH(8–4) ro-vibrational band emissions, using a non-local thermal equilibrium model, with the aim of offering new insight into the atomic oxygen abundances in the mesopause region. The dataset is based on the level-1 atmospheric background measurements observed by the GOMOS instrument on board Envisat. Raw data are reprocessed into monthly zonal mean values in 10° latitude bins with a fixed altitude grid of 3 km. The dataset spans from 70° S to 70° N in latitude and from 80 km to 100 km in altitude, covering a time period from May 2002 to December 2011 at local times of from 10 p.m. to 12 p.m.

The atomic oxygen density peaks at about 95 km and the highest values are in the range of 3–8 × 1011 atoms cm−3, depending on latitude and season. There is a rapid decrease of [O] below its peak region. The annual oscillation (AO), semiannual oscillation (SAO), and the solar cycle impact are distinguished from the [O] longtime series variations. This new GOMOS [O] dataset conforms to other published datasets and is consistent with the [O] datasets obtained from the SCIAMACHY OH airglow measurements to within about ±20 %.

Qiuyu Chen et al.
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Short summary
Atomic oxygen is one of the most important trace species in the mesopause region. A common technique to derive it from satellite measurements is to measure airglow emissions involved in the photochemistry of oxygen. In this work, hydroxyl nightglow measured by the GOMOS instrument on Envisat is used to derive a 10-year dataset of atomic oxygen in the middle and upper atmosphere. Annual and semiannual oscillations are observed in the data. The new data is consistent with various other datasets.
Atomic oxygen is one of the most important trace species in the mesopause region. A common...
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