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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 36, issue 2 | Copyright

Special issue: Space weather connections to near-Earth space and the...

Ann. Geophys., 36, 415-424, 2018
https://doi.org/10.5194/angeo-36-415-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 16 Mar 2018

Regular paper | 16 Mar 2018

A major event of Antarctic ozone hole influence in southern Brazil in October 2016: an analysis of tropospheric and stratospheric dynamics

Gabriela Dornelles Bittencourt1, Caroline Bresciani1, Damaris Kirsch Pinheiro1, José Valentin Bageston2, Nelson Jorge Schuch2, Hassan Bencherif3, Neusa Paes Leme4, and Lucas Vaz Peres5 Gabriela Dornelles Bittencourt et al.
  • 1Federal University of Santa Maria, Santa Maria, RS, Brazil
  • 2National Institute for Space Research, Southern Regional Space Research Center, Santa Maria, RS, Brazil
  • 3University of Reunion Island, LACy, UMR 8105, Saint-Denis, Réunion, France
  • 4National Institute of Space Research, Northeast Regional Center, Natal, RN, Brazil
  • 5Federal University of Western Pará, Santarém, PA, Brazil

Abstract. The Antarctic ozone hole is a cyclical phenomenon that occurs during the austral spring where there is a large decrease in ozone content in the Antarctic region. Ozone-poor air mass can be released and leave through the Antarctic ozone hole, thus reaching midlatitude regions. This phenomenon is known as the secondary effect of the Antarctic ozone hole. The objective of this study is to show how tropospheric and stratospheric dynamics behaved during the occurrence of this event. The ozone-poor air mass began to operate in the region on 20 October 2016. A reduction of ozone content of approximately 23% was observed in relation to the climatology average recorded between 1992 and 2016. The same air mass persisted over the region and a drop of 19.8% ozone content was observed on 21 October. Evidence of the 2016 event occurred through daily mean measurements of the total ozone column made with a surface instrument (Brewer MkIII no. 167 Spectrophotometer) located at the Southern Space Observatory (29.42°S, 53.87°W) in São Martinho da Serra, Rio Grande do Sul. Tropospheric dynamic analysis showed a post-frontal high pressure system on 20 and 21 October 2016, with pressure levels at sea level and thickness between 1000 and 500hPa. Horizontal wind cuts at 250hPa and omega values at 500hPa revealed the presence of subtropical jet streams. When these streams were allied with positive omega values at 500hPa and a high pressure system in southern Brazil and Uruguay, the advance of the ozone-poor air mass that caused intense reductions in total ozone content could be explained.

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Ozone-poor air mass can be released and leave through the Antarctic ozone hole, thus reaching midlatitude regions. The objective of this study is to show how tropospheric and stratospheric dynamics behaved during the event. The ozone-poor air mass began to operate in the region on 20 October 2016. A reduction of ozone content of approximately 23 % was observed in relation to the climatology average. The advance of the ozone-poor air mass caused intense reductions in total ozone content.
Ozone-poor air mass can be released and leave through the Antarctic ozone hole, thus reaching...
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