Preprints
https://doi.org/10.5194/egusphere-2023-2574
https://doi.org/10.5194/egusphere-2023-2574
23 Nov 2023
 | 23 Nov 2023

No severe ozone depletion in the tropical stratosphere in recent decades

Jayanarayanan Kuttippurath, Gopalakrishna Pillai Gopikrishnan, Rolf Müller, Sophie Godin-Beekmann, and Jerome Brioude

Abstract. Stratospheric ozone is an important constituent of the atmosphere. Significant changes in its concentrations have great consequences for the environment in general and for ecosystems, in particular. Here, we analyse ground-based, ozonesonde and satellite ozone measurements, and reanalysis data to examine the ozone depletion in the tropics, and the spatiotemporal trends in ozone during the past five decades (1980–2020). In the tropics, the amount of column ozone is small (250–270 DU) compared to high and mid-latitudes. In addition, the tropical total ozone trend is very small (±0–0.2 DU/yr), compared to high (±1–1.5 DU/yr) and mid-latitudes (±0.75–1 DU/yr) of both hemispheres as estimated for the period 1998–2018. No measurements and no analyses show any signature of severe stratospheric ozone depletion in the tropics in contrast to a recent claim. Finally, it is very unlikely that an ozone hole would occur outside the Antarctic today with respect to the current stratospheric halogen levels.

Jayanarayanan Kuttippurath, Gopalakrishna Pillai Gopikrishnan, Rolf Müller, Sophie Godin-Beekmann, and Jerome Brioude

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2574', Anonymous Referee #1, 11 Dec 2023
  • RC2: 'New insights from the paper is missing', Anonymous Referee #2, 06 Jan 2024
Jayanarayanan Kuttippurath, Gopalakrishna Pillai Gopikrishnan, Rolf Müller, Sophie Godin-Beekmann, and Jerome Brioude
Jayanarayanan Kuttippurath, Gopalakrishna Pillai Gopikrishnan, Rolf Müller, Sophie Godin-Beekmann, and Jerome Brioude

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Short summary
No measurements and no analyses show any sign of severe stratospheric ozone depletion in the tropics in contrast to a recent claim. It is very unlikely that an ozone hole would occur outside the Antarctic today with respect to the current stratospheric halogen levels.