author = "Bittencourt, Gabriela Dornelles and Bresciani, Caroline and 
                         Pinheiro, Damaris Kirsch and Bageston, Jos{\'e} Valentin and 
                         Schuch, Nelson Jorge and Bencherif, Hassan and Leme, Neusa Maria 
                         Paes and Peres, Lucas Vaz",
          affiliation = "{Universidade Federal de Santa Maria (UFSM)} and {Universidade 
                         Federal de Santa Maria (UFSM)} and {Universidade Federal de Santa 
                         Maria (UFSM)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {University of Reunion Island} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidade Federal do Oeste do 
                title = "A major event of Antarctic ozone hole influence in southern Brazil 
                         in October 2016: An analysis of tropospheric and stratospheric 
              journal = "Annales Geophysicae",
                 year = "2018",
               volume = "36",
               number = "2",
                pages = "415--424",
                month = "Mar.",
             keywords = "Atmospheric composition and structure (middle atmosphere  
                         composition and chemistry).",
             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 S{\~a}o 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.",
                  doi = "10.5194/angeo-36-415-2018",
                  url = "http://dx.doi.org/10.5194/angeo-36-415-2018",
                 issn = "0992-7689",
             language = "en",
           targetfile = "bittencourte_major.pdf",
        urlaccessdate = "18 abr. 2021"