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@Article{ZouMacSamRamKur:2018:ChEx20,
               author = "Zou, Yong and Macau, Elbert Einstein Nehrer and Sampaio, Gilvan 
                         and Ramos, Ant{\^o}nio M{\'a}rio de Torres and Kurths, 
                         J{\"u}rgen",
          affiliation = "{East China Normal University} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {University of Aberdeen}",
                title = "Characterizing the exceptional 2014 drought event in S{\~a}o 
                         Paulo by drought period length",
              journal = "Climate Dynamics",
                 year = "2018",
               volume = "51",
               number = "1/2",
                pages = "433--442",
                month = "July",
             keywords = "Drought period length ˇ Precipitation ˇ Southeast Brazil ˇ Sea 
                         surface temperature ˇ Sea level pressure ˇ South Atlantic ocean.",
             abstract = "In the last decade, the southeast region of Brazil has been 
                         suffering severe water shortages. Here, we propose to compute the 
                         expected drought period length to characterize the drought events 
                         in the region of S{\~a}o Paulo. We report the unique properties 
                         of the exceptional drought event during the austral summer 2014 by 
                         showing the differences and similarities to the very dry season in 
                         2001 and the mild dry seasons in 2006 and 2015. Furthermore, we 
                         investigate the correlations of the abnormal precipitation deficit 
                         with the ocean and atmospheric patterns. In comparison to other 
                         drought events, we validate the hypothetical mechanism that 
                         underlies the exceptional drought 2014: (1) The existence of an 
                         anomalous high pressure center in the area acts as a blocking 
                         mechanism that prevents moisture transport from the Amazon and 
                         passage of cold front systems from south Brazil. This blocking 
                         high has been observed in all dry seasons considered, with much 
                         larger magnitude in 2014. (2) The much faster increasing trend of 
                         the anomalous sea surface temperature acts as a strong feedback 
                         which intensified the extreme climate conditions. The 
                         unprecedented increasing trend of the SST in 2014 was not observed 
                         in other climate variables representing a high pressure center. 
                         Therefore, we conclude that the exceptional drought 2014 was 
                         enhanced by the feedback mechanism of anomalous warming of SST in 
                         the South Atlantic Oceans, which was resulted from the anomalous 
                         high pressure.",
                  doi = "10.1007/s00382-017-3932-2",
                  url = "http://dx.doi.org/10.1007/s00382-017-3932-2",
                 issn = "0930-7575",
             language = "en",
           targetfile = "zou_characterizing.pdf",
        urlaccessdate = "04 dez. 2020"
}


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