@Article{CamposCPMKPVACB:2019:NeMeMi,
               author = "Campos, Mar{\'{\i}}lia C. and Chiessi, Cristiano M. and Prange, 
                         Matthias and Mulitza, Stefan and Kuhnert, Henning and Paul, 
                         Andr{\'e} and Ven{\^a}ncio, Igor Martins and Albuquerque, Ana 
                         Luiza S. and Cruz, Francisco W. and Bahr, Andr{\'e}",
          affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Universidade de 
                         S{\~a}o Paulo (USP)} and {University of Bremen} and {University 
                         of Bremen} and {University of Bremen} and {University of Bremen} 
                         and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Federal Fluminense (UFF)} and {Universidade de 
                         S{\~a}o Paulo (USP)} and {Heidelberg University}",
                title = "A new mechanism for millennial scale positive precipitation 
                         anomalies over tropical South America",
              journal = "Quaternary Science Reviews",
                 year = "2019",
               volume = "225",
                pages = "e105990",
                month = "Dec.",
             keywords = "Quaternary, Paleoclimatology, South America, Inorganic 
                         geochemistry, Heinrich Stadials, Precipitation, 
                         X-rayfluorescence.",
             abstract = "Continental and marine paleoclimate archives from northwestern and 
                         northeastern South America recorded positive precipitation 
                         anomalies during Heinrich Stadials (HS). These anomalies have been 
                         classically attributed to enhanced austral summer (monsoon) 
                         precipitation. However, the lack of marine paleoclimate records 
                         off eastern South America as well as inconsistencies between 
                         southeastern South American continental and marine records hamper 
                         a comprehensive understanding of the mechanism responsible for 
                         (sub-) tropical South American hydroclimate response to HS. Here 
                         we investigate piston core M125-95-3 collected off eastern South 
                         America (10.94°S) and simulate South American HS conditions with a 
                         high-resolution version of an atmosphere-ocean general circulation 
                         model. Further, meridional changes in precipitation over (sub-) 
                         tropical South America were assessed with a thorough compilation 
                         of previously available marine paleorecords. Our ln(Ti/Ca) and 
                         ln(Fe/K) data show increases during HS6-Younger Dryas. It is the 
                         first core off eastern South America and the southernmost from the 
                         Atlantic continental margin of South America that unequivocally 
                         records HS-related positive precipitation anomalies. Based on our 
                         new data, model results and the compilation of available marine 
                         records, we propose a new mechanism for the positive precipitation 
                         anomalies over tropical South America during HS. The new mechanism 
                         involves austral summer precipitation increases only over eastern 
                         South America while the rest of tropical South America experienced 
                         precipitation increases during the winter, challenging the widely 
                         held assumption of a strengthened monsoon. South American 
                         precipitation changes were triggered by dynamic and thermodynamic 
                         processes including a stronger moisture supply from the equatorial 
                         North Atlantic (tropical South Atlantic) in austral winter 
                         (summer).",
                  doi = "10.1016/j.quascirev.2019.105990",
                  url = "http://dx.doi.org/10.1016/j.quascirev.2019.105990",
                 issn = "0277-3791",
             language = "en",
           targetfile = "campos_new.pdf",
        urlaccessdate = "27 abr. 2024"
}