文章基本信息

标题：Paleoproductivity changes during the Late Quaternary in the southeastern Brazilian upper continental margin of the Southwestern Atlantic
本地全文：下载
作者：Nagai, Renata Hanae ; Sousa, Silvia Helena de Mello e ; Lourenço, Rafael André 等
期刊名称：Brazilian Journal of Oceanography
印刷版ISSN：1679-8759
电子版ISSN：1982-436X
出版年度：2010
卷号：58
期号：spe1
页码：31-41
DOI：10.1590/S1679-87592010000500004
出版社：Instituto Oceanográfico da Universidade de São Paulo
摘要：Changes in the Brazilian continental margins oceanic productivity and circulation over the last 27,000 years were reconstructed based on sedimentological and microfaunal analyses.Our results suggest that oceanic paleoproductivity and the supply of terrigenous sediments to the Brazilian continental margin were higher during the Last Glacial Maximum (LGM) than during the Holocene.These changes may have been primarily influenced by significant sea level fluctuations that have occurred since the late Pleistocene.During the LGM, the lower sea level, higher productivity and lower sea-surface paleotemperatures may have been the result of the offshore displacement of the main flow of the Brazil Current.However, during the Holocene, the warm waters of the Brazil Current were displaced toward the coast.This displacement contributed to the increase in water temperature and prevented an increase in oceanic productivity.The decrease in terrigenous supply since the LGM could be related to the increase of the extension of the continental shelf and/or drier climatic conditions.
关键词：Foraminiferos;Corrente do Brasil;Quaternário Tardio;Atlântico Sudoeste
其他关键词：Foraminifera;Brazil Current;Late Quaternary;Southwestern Atlantic