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https://doi.org/10.5194/amt-2017-467
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
09 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
MIPAS Observations of Ozone in the Middle Atmosphere
Manuel López-Puertas1, Maya García-Comas1, Bernd Funke1, Angela Gardini1, Gabriele P. Stiller2, Thomas von Clarmann2, Norbert Glatthor2, Alexandra Laeng2, Martin Kaufmann3, Viktoria F. Sofieva4, Lucien Froidevaux5, Kaley A. Walker6, and Masato Shiotani7 1Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain
2Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Karlsruhe, Germany
3Institute for Energy and Climate Research, Research Centre Jülich, Jülich, Germany
4Finnish Meteorological Institute, Earth Observation, Helsinki, Finland
5Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
6Department of Physics, University of Toronto, Toronto, Ontario, Canada
7Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto, Japan
Abstract. In this paper we describe the stratospheric and mesospheric ozone (version V5r_O3_m22) distributions retrieved from MIPAS observations in the three middle atmosphere modes (MA, NLC and UA) taken with an unapodized spectral resolution of 0.0625 cm−1 from 2005 until April 2012. O3 is retrieved from microwindows in the 14.8 μm and 10 μm spectral regions and requires non-LTE modelling of the O3 v1 and v3 vibrational levels. Ozone is reliably retrieved from 20 km in the MA mode (40 km for UA and NLC) up to ~ 105 km during dark conditions and up to ~ 95 km during illuminated conditions. Daytime MIPAS O3 has an average vertical resolution of 3–4 km below 70 km, 6–8 km at 70–80 km, 8–10 km at 80–90 km and 5–7 km at the secondary maximum (90–100 km). For nighttime conditions the vertical resolution is similar below 70 km, and better in the upper mesosphere and lower thermosphere: 4–6 km at 70–100 km, 4–5 km at the secondary maximum, and 6–8 km at 100–105 km. The noise error for daytime conditions is typically smaller than 2 % below 50 km, 2–10 % between 50 and 70 km, 10–20 % at 70–90 km and ~ 30 % above 95 km. For nighttime, the noise errors are very similar below around 70 km but significantly smaller above, being 10–20 % at 75–95 km, 20–30 % at 95–100 km and larger than 30 % above 100 km. The additional major O3 errors are the spectroscopic data uncertainties below 50 km (10–12 %), and the non-LTE and temperature errors above 70 km. The validation performed suggests that the spectroscopic errors below 50 km, mainly caused by the O3 air-broadened half-widths of the v2 band, are overestimated. The non-LTE error (including the uncertainty of atomic oxygen at nighttime) is relevant only above ~ 85 km with values of 15–20 %. The temperature error varies from ~ 3 % up to 80 km to 15–20 % near 100 km. Between 50 and 70 km, the pointing and spectroscopic errors are the dominant uncertainties. The validation performed in comparisons with SABER, GOMOS, MLS, SMILES and ACE-FTS shows that MIPAS O3 has an accuracy better than 5 % at and below 50 km, with a positive bias of a few percent. In the 50–75 km region, MIPAS O3 has a positive bias of ~ 10 %, which is possibly caused in part by O3 spectroscopic errors in the 10 μm region. Between 75 and 90 km, MIPAS nighttime O3 is in agreement with other instruments by 10 %, but for daytime the agreement is slightly larger, ~ 10–20 %. Above 90 km, MIPAS daytime O3 is in agreement with other instruments by 10 %. At nighttime, however, it shows a positive bias increasing from 10 % at 90 km to 20 % at 95–100 km, the latter of which is attributed to the large atomic oxygen abundance used. We also present MIPAS O3 distributions as function of altitude, latitude and time, showing the major O3 features in the middle and upper mesosphere. In addition to the rapid diurnal variation due to photochemistry, the data also show apparent signatures of the diurnal migrating tide, both during day and nighttime, as well as the effects of the semi-annual oscillation above ~ 70 km in the tropics and mid-latitudes. The tropical daytime O3 at 90 km shows a solar signature in phase with the solar cycle.

Citation: López-Puertas, M., García-Comas, M., Funke, B., Gardini, A., Stiller, G. P., von Clarmann, T., Glatthor, N., Laeng, A., Kaufmann, M., Sofieva, V. F., Froidevaux, L., Walker, K. A., and Shiotani, M.: MIPAS Observations of Ozone in the Middle Atmosphere, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-467, in review, 2018.
Manuel López-Puertas et al.
Manuel López-Puertas et al.
Manuel López-Puertas et al.

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Short summary
This paper describes the inversion of O3 data from MIPAS middle atmosphere spectra which requires non-LTE. The O3 dataset comprises from 20 to 100 km, has a pole-to pole latitude coverage, day and nighttime, and span from 2005 until 2012. A validation of the data against other satellite measurements and an overall description of O3 is also presented. This is an important dataset for the community and describes the major characteristics of stratospheric and mesospheric O3.
This paper describes the inversion of O3 data from MIPAS middle atmosphere spectra which...
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