Preprints
https://doi.org/10.5194/amt-2021-339
https://doi.org/10.5194/amt-2021-339

  17 Nov 2021

17 Nov 2021

Review status: this preprint is currently under review for the journal AMT.

Ground-based Ku-band microwave observations of ozone in the polar middle atmosphere

David Newnham1, Mark Clilverd1, William Clark1, Michael Kosch2,3,4, Pekka Verronen5,6, and Alan Rogers7 David Newnham et al.
  • 1British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom
  • 2Physics Department, Lancaster University, Lancaster, LA1 4YB, UK
  • 3South African National Space Agency (SANSA), Hospital Street, Hermanus 7200, South Africa
  • 4Department of Physics and Astronomy, University of the Western Cape, Robert Sobukwe Road, Bellville, 7535, South Africa
  • 5Sodankylä Geophysical Observatory, University of Oulu, Tähteläntie 62, 99600 Sodankylä, Finland
  • 6Space and Earth Observation Centre, Finnish Meteorological Institute, P.O. Box 503, 00101, Helsinki, Finland
  • 7MIT Haystack Observatory, Route 40, Westford, MA 01886, United States

Abstract. Ground based observations of 11.072 GHz atmospheric ozone (O3) emission have been made using the Ny Ålesund Ozone in the Mesosphere Instrument (NAOMI) at the UK Arctic Research Station (latitude 78°55’0” N, longitude 11°55’59” E), Spitsbergen. Seasonally averaged O3 vertical profiles in the Arctic polar mesosphere lower thermosphere region for night-time and twilight conditions in the period 15 August 2017 to 15 March 2020 have been retrieved over the altitude range 62–98 km. NAOMI measurements are compared with corresponding, overlapping observations by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) satellite instrument. The NAOMI and SABER data are binned according to the SABER instrument 60 day yaw cycles into 3 month ‘winter’ (15 December–15 March), ‘autumn’ (15 August–15 November), and ‘summer’ (15 April–15 July) periods. The NAOMI observations show the same year-to-year and seasonal variabilities as the SABER 9.6 μm O3 data. The winter night-time (solar zenith angle, SZA ≥ 110°) and twilight (75° ≤ SZA ≤ 110°) NAOMI and SABER 9.6 μm O3 volume mixing ratio (VMR) profiles agree to within the measurement uncertainties. However, for autumn twilight conditions the SABER 9.6 μm O3 secondary maximum VMR values are higher than NAOMI over altitudes 88–97 km by 47 % and 59 % respectively in 2017 and 2018. Comparing the two SABER channels which measure O3 at different wavelengths and use different processing schemes, the 9.6 μm O3 autumn twilight VMR data for the three years 2017–19 are higher than the corresponding 1.27 μm measurements with the largest difference (58 %) in the 65–95 km altitude range similar to the NAOMI observation. The SABER 9.6 μm O3 summer daytime (SZA < 75°) mesospheric O3 VMR is also consistently higher than the 1.27 μm measurement, confirming previously reported differences between the SABER 9.6 μm channel and measurements of mesospheric O3 by other satellite instruments.

David Newnham et al.

Status: open (until 23 Dec 2021)

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  • RC1: 'Comment on amt-2021-339', Anonymous Referee #1, 07 Dec 2021 reply

David Newnham et al.

David Newnham et al.

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Short summary
Ozone (O3) is an important trace gas in the mesosphere and lower thermosphere (MLT), affecting heating rates and chemistry. O3 profiles measured by the Ny Ålesund Ozone in the Mesosphere Instrument agree with Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) for winter night-time but autumn twilight SABER abundances are up to 50 % higher. O3 abundances in the MLT from two different SABER channels also show significant differences for both autumn twilight and summer daytime.