08 Aug 2023
 | 08 Aug 2023

Measurement report: Influence of the Antarctic Ozone Hole in Southern Brazil: Conceptual model for 42 years of analysis the atmospheric dynamics on ozone

Gabriela Dornelles Bittencourt, Damaris Kirsch Pinheiro, Hassan Bencherif, Lucas Vaz Peres, Nelson Begue, José Valentin Bageston, Douglas Lima de Bem, Vagner Anabor, and Luiz Angelo Steffenel

Abstract. The austral spring in the Southern Hemisphere presents temporary reductions in ozone content mainly in the Antarctic region known as the Antarctic Ozone Hole (AOH). However, studies show an influence in mid-latitude regions, such as southern Brazil, where days with temporary decreases in the total column ozone (TCO) are identified. The main objective of this work is to investigate this influence of AOH on the southern region of Brazil, using data from the TCO and vertical profiles that will help to identify the preferential height at which these decreases occur in southern Brazil, in addition to analyzing the atmospheric dynamic behavior during these events in the period 42 years of data (1979 to 2020). The methodology used comprises the analysis of average daily data of the total column of ozone through ground-based instruments (Brewer Spectrophotometer), satellite data (TOMS and OMI), and to compare reanalysis data from the ECMWF-ERA5, for the identification of events of influence of the AOH on the southern region of Brazil. The analysis of the vertical content of ozone (O3) data from the TIMED/SABER satellite provides daily data from 15 to 110 km in height and has 19 years of O3 profiles available in the period from 2002 to 2020. From this, 102 events were identified that influenced Santa Maria (29.4º S; 53.7º W), in the south of Brazil, with a temporary decrease in the ozone content in the period, where between 24.1–28 km of altitude the more significant reductions in O3 during events. In the dynamic analysis, the stratospheric fields showed an increase in the absolute potential vorticity, mainly in September and October. The conceptual models in the horizontal and vertical section of the atmosphere explain the action of the stratospheric and tropospheric jet during the occurrence of events of decrease in the O3 content in Santa Maria. It was possible to identify the strong influence on the development of these events through the connection of the stratospheric jet (polar vortex) with the tropospheric jets (polar and subtropical jet) at medium and high levels of the atmosphere.

Gabriela Dornelles Bittencourt et al.

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-2023-1471', Anonymous Referee #1, 05 Sep 2023
    • AC1: 'Reply on RC1', Gabriela Bittencourt, 11 Nov 2023
    • AC4: 'Reply on RC1', Gabriela Bittencourt, 11 Nov 2023
  • RC2: 'Comment on egusphere-2023-1471', Anonymous Referee #2, 06 Sep 2023
    • AC2: 'Reply on RC2', Gabriela Bittencourt, 11 Nov 2023
    • AC5: 'Reply on RC2', Gabriela Bittencourt, 11 Nov 2023
  • EC1: 'Comment on egusphere-2023-1471', Jens-Uwe Grooß, 13 Sep 2023
    • AC3: 'Reply on EC1', Gabriela Bittencourt, 11 Nov 2023

Gabriela Dornelles Bittencourt et al.

Data sets

TCO by Brewer Spectrophotometer at Santa Maria Station José Valentin Bageston

TCO by TOMS satellite data Richard D. McPeters, P. K. Bhartia, and Arlin J. Krueger, and Jay R. Herman

TCO by OMI satellite data Michael M. Yan

Ozone vertical profile by TIMED/SABER James M. Russell III

ECMWF-ERA5 meteorological data Hans Hersbach!/dataset/10.24381/cds.bd0915c6

Gabriela Dornelles Bittencourt et al.


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Short summary
The study examines ozone depletions at mid-latitudes in Brazil during austral spring Antarctic Ozone Hole influence events. The methodology applied used data from the total column ozone, vertical profile of the atmosphere, and reanalysis data to analyze the atmospheric dynamics. The main motivation of this work is to show how this important trace gas dynamically behaves in the atmosphere in the active period of the Antarctic Ozone Hole in regions of medium latitudes.