Preprints
https://doi.org/10.5194/acp-2021-1066
https://doi.org/10.5194/acp-2021-1066
 
03 Jan 2022
03 Jan 2022
Status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Ozone-Gravity Wave Interaction in the Upper Stratosphere/Lower Mesosphere

Axel Gabriel Axel Gabriel
  • Leibniz-Institute of Atmospheric Physics at the University Rostock e.V. (IAP)

Abstract. The increase in amplitudes of upward propagating gravity waves (GWs) with height due to decreasing density is usually described by exponential growth; however, recent measurements detected a much stronger increase in gravity wave potential energy density (GWPED) during daylight than night-time (increase by a factor of about 4 to 8 between middle stratosphere and upper mesosphere), which is not well understood up to now. This paper suggests that ozone-gravity wave interaction in the upper stratosphere/lower mesosphere is largely responsible for this phenomenon. The coupling between ozone-photochemistry and temperature is particularly strong in the upper stratosphere where the time-mean ozone mixing ratio is decreasing with height; therefore, an initial uplift of an air parcel must lead to a local increase in ozone and in the heating rate compared to the environment, and, hence, to an amplification of the initial uplift. Standard solutions of upward propagating GWs with linear ozone-temperature coupling are formulated suggesting local amplitude amplifications during daylight of 5 to 15 % for low-frequency GWs (periods ≥4 hours), as a function of the intrinsic frequency which decreases if ozone-temperature coupling is included. Subsequently, for horizontal wavelengths larger than 500 km and vertical wavelengths smaller than 5 km, the cumulative amplification during the upward level-by-level propagation leads to much stronger amplitudes in the GW perturbations (factor of about 1.5 to 3) and in the GWPED (factor of about 3 to 9) at upper mesospheric altitudes. The results open a new viewpoint for improving general circulation models with resolved or parameterized GWs.

Axel Gabriel

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-1066', Anonymous Referee #1, 01 Feb 2022
    • AC1: 'Reply on RC1', Axel Gabriel, 10 Feb 2022
      • RC3: 'Reply on AC1', Anonymous Referee #1, 11 Feb 2022
        • AC3: 'Reply on RC3', Axel Gabriel, 13 Feb 2022
  • RC2: 'Comment on acp-2021-1066', Anonymous Referee #2, 02 Feb 2022
    • AC2: 'Reply on RC2', Axel Gabriel, 12 Feb 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-1066', Anonymous Referee #1, 01 Feb 2022
    • AC1: 'Reply on RC1', Axel Gabriel, 10 Feb 2022
      • RC3: 'Reply on AC1', Anonymous Referee #1, 11 Feb 2022
        • AC3: 'Reply on RC3', Axel Gabriel, 13 Feb 2022
  • RC2: 'Comment on acp-2021-1066', Anonymous Referee #2, 02 Feb 2022
    • AC2: 'Reply on RC2', Axel Gabriel, 12 Feb 2022

Axel Gabriel

Axel Gabriel

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Short summary
Recent measurements found that the amplitudes of atmospheric gravity waves (horizontal wavelengths of 100 to 2000 km), which propagate from the troposphere (0–10 km) to the strato- and mesosphere (10–100 km), increase much stronger during daylight than nighttime (factor of about 4 to 8), which is not understood up to now. This study shows that stratospheric ozone-temperature coupling can principally produce such an amplification. The results will help to improve atmospheric circulation models.
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