@Article{RossettiCohePess:2017:VeChSo,
               author = "Rossetti, Dilce de F{\'a}tima and Cohen, Marcelo C. L. and 
                         Pessenda, Luiz C. R.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Federal do Par{\'a} (UFPA)} and {Universidade de 
                         S{\~a}o Paulo (USP)}",
                title = "Vegetation change in southwestern amazonia (Brazil) and 
                         relationship to the late pleistocene and holocene climate",
              journal = "Radiocarbon",
                 year = "2017",
               volume = "59",
               number = "1",
                pages = "69--89",
                month = "Feb.",
             keywords = "Carbon isotopes, Climate, Late Pleistocene-Holocene, Sedimentary 
                         dynamics, Southwestern Amazonia, Vegetation.",
             abstract = "The Late Quaternary climate in Amazonia is an issue still open to 
                         debate, with hypotheses varying from alternate dry and wet 
                         episodes to stable climate with undisturbed rainforest. We 
                         approach this question using \δ13C, C/N, and, to a lesser 
                         extent, \δ15N from deposits derived from four cores, with 
                         the results combined with published pollen data from two of these 
                         cores. These data were analyzed within the context of radiocarbon 
                         dating, which revealed ages ranging from 42.8-41.8 to 2.3-2.2 cal 
                         ka BP. Fluvial channel and floodplain deposits with freshwater 
                         phytoplankton recorded a trend of wet climate with dry episodes 
                         before ~40 cal ka BP, followed by humid and cold climate until the 
                         Last Glacial Maximum, with intensified aridity towards the end of 
                         the Late Pleistocene. Peaks of increased contributions in C4 land 
                         plants in the mid-to late Holocene were not synchronous and have 
                         no correspondence with Amazonian Holocene dry episodes, being due 
                         to sedimentary processes related to fluvial dynamics during the 
                         establishment of herbaceous fields on abandoned depositional 
                         sites. Thus, the climate remained wet in the Holocene, which would 
                         have favored the expansion of the Amazonian rainforest as we see 
                         today.",
                  doi = "10.1017/RDC.2016.107",
                  url = "http://dx.doi.org/10.1017/RDC.2016.107",
                 issn = "0033-8222",
             language = "en",
        urlaccessdate = "27 abr. 2024"
}