Evidence for an ozone hole perturbation at 30° South

Kirchhoff, V. W. J. H.; Schuch, Nelson Jorge; Pinheiro, Damaris Kirsch; Harris, Joyce M.

doi:10.1016/1352-2310(95)00362-2

Cited by 83 publications

(57 citation statements)

References 10 publications

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“…The black line at 291 DU represents the value of the climatological average for October, where during approximately the whole month the content remained with values below the climatological average. This event was identified as one of the largest ever recorded in southern Brazil, which was similar to the first event observed in the region by Kirchhoff et al (1996).…”

Section: Resultssupporting

confidence: 54%

“…Ozone-poor air masses are released from the interior of the Antarctic polar vortex near the edge of the ozone hole in a phenomenon known as the secondary effect of the Antarctic ozone hole (Marchand et al, 2005). This phenomenon results in a temporary drop of ozone content, which was first observed by Kirchhoff et al (1996) in southern Brazil.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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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 500 hPa. Horizontal wind cuts at 250 hPa and omega values at 500 hPa revealed the presence of subtropical jet streams. When these streams were allied with positive omega values at 500 hPa 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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Section: Resultssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…Events of Influence of Antarctic Ozone Hole over middle latitudes is becoming more frequent (Kirchhoff et al, 1996; subtropical jet stream toward the Atlantic Ocean, and the performance of their region of polar input and center of positive values of Omega in the wind field in 250 hPa and Vertical speed Omega in 500 hPa over South of Brazil in October 20 Th , 2011 (a), characteristic by subsidence and intrusion of stratospheric air into the troposphere.…”

Section: Discussionmentioning

confidence: 99%

“…The passage of air masses originating from the Antarctic ozone hole (Farman et al, 1985) on medium latitudes was first observed on the South of Brazil (29.4ºS; 53.8ºW) by Kirchhoff et al (1996), being this type of phenomenon called 'influence of the Antarctic ozone hole, which has been frequently observed over South America (Perez et al, 2000;Pinheiro et al, 2012). Peres et al, 2012, observed …”

Section: Introductionmentioning

confidence: 99%

Weather Condition Associated With Influence of the Antarctic Ozone Hole Over South of Brazil on October 21th, 2011

Peres¹,

Shuch²,

Anabor³

et al. 2015

INCT-APA Annual Activity Report

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“…A região sul da América do Sul é bastante afetada por efeitos secundários do buraco de ozônio Antártico durante as primaveras austrais, ou seja, quando o vór-tice que envolve o buraco de ozônio da Antártica perde suas forças devido ao fim da noite polar (LIOU, 2002), e permite que massas de ar pobres em ozônio se desprendam e migrem para latitudes menores (KIRCHHOFF ET al., 1996).…”

Section: Introductionunclassified

Análise Dos Dois Principais Fatores De Decaimento Da Coluna Total De Ozônio Sobre O Sul Da América Do Sul

Schmalfuss

Mariano

Pinheiro

et al. 2014

CeN

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Resumo O ozônio (O3) é indispensável para a vida na Terra, pois absorve radiação ultravioleta do tipo B (UV-B) que é prejudicial para a saúde de seres vivos. Desde o início da década de Abstract Ozone (O3) is less than 1% of Earth's atmospheric gases. However, it is essential for life on Earth because it absorbs ultraviolet radiation (UV-B), which is bad for the health of living beings. Since the beginning of 1980 it was reported that there was depletion in the ozone layer over Antarctica and that this could move to lower latitudes. The main objective of this work is the analysis of the main events of total ozone decay over southern South America (20°S, 40°S and 30°W, 80°W)

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Evidence for an ozone hole perturbation at 30° South

Cited by 83 publications

References 10 publications

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

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

Weather Condition Associated With Influence of the Antarctic Ozone Hole Over South of Brazil on October 21th, 2011

Análise Dos Dois Principais Fatores De Decaimento Da Coluna Total De Ozônio Sobre O Sul Da América Do Sul

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