@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 = "03 jun. 2024"
}