University of Oulu

Newnham, D. A., Clilverd, M. A., Clark, W. D. J., Kosch, M., Verronen, P. T., and Rogers, A. E. E.: Ground-based Ku-band microwave observations of ozone in the polar middle atmosphere, Atmos. Meas. Tech., 15, 2361–2376,, 2022.

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

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Author: Newnham, David A.1; Clilverd, Mark A.1; Clark, William D. J.1;
Organizations: 1British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
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, USA
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 6.3 MB)
Persistent link:
Language: English
Published: Copernicus Publications, 2022
Publish Date: 2023-02-14


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 7855’0’’ N, longitude 1155’59’’ 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 version 2.0 data are binned according to the SABER instrument 60 d yaw cycles into nominal 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 2017–2019 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..

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Series: Atmospheric measurement techniques
ISSN: 1867-1381
ISSN-E: 1867-8548
ISSN-L: 1867-1381
Volume: 15
Issue: 8
Pages: 2361 - 2376
DOI: 10.5194/amt-15-2361-2022
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This work has been supported by the UK's Natural Environment Research Council (NERC) Technologies Proof-of-Concept project “Satellite TV-based Ozone and OH Observations using Radiometric Measurements (STO3RM)” (grant no. NE/P003478/1) awarded to David A. Newnham. NAOMI testing and deployment was supported by the Royal Society Newton Fund project “The Effect of High-Energy Particle Precipitation from Space on the Earth’s Atmosphere” (grant no. NI150103) awarded to Michael Kosch and Mark A. Clilverd. Pekka T. Verronen was supported by Academy of Finland project “ICT-Solutions to Understand Variability of Arctic Climate (ICT-SUNVAC)” (grant no. 335555).
Dataset Reference: The processed NAOMI and SABER datasets (Newnham et al., 2022) used in this study are available from the UK Polar Data Centre (, last access: 22 March 2022; NERC, 2022). SABER data used in this study can be downloaded from (last access: 30 April 2020; GATS, 2022). The presented data can be downloaded from (last access: 2 February 2022; Newnham et al., 2022).
Copyright information: © Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License.