globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.02.032
论文题名:
A multiproxy approach to the climate and marine productivity variations along MIS 5 in SE Brazil: A comparison between major components of calcareous nannofossil assemblages and geochemical records
作者: Costa K.B.; Cabarcos E.; Santarosa A.C.A.; Battaglin B.B.F.; Toledo F.A.L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 449
起始页码: 275
结束页码: 288
语种: 英语
英文关键词: Coccolithophores ; MIS 5 ; Productivity ; SE Brazil ; Southwestern Atlantic ; Terrigenous inputs
英文摘要: In this study, changes in terrigenous input, based on geochemical elementary ratios (e.g. Fe/Ca, Ti/Ca, Ba/Ca, Fe/K), and on marine primary productivity, based on calcareous nannofossil assemblages, from the southeastern Brazilian continental margin are analyzed for the time interval 140 to 55 ka (MIS 6 to MIS 4). Variation in the terrigenous input follows the continental paleoclimate records, based on speleothems from SE Brazil, and the summer insolation curve from low latitudes for the southern hemisphere. In turn, marine productivity shows a high correlation with terrigenous input. Terrigenous input maxima correlate to increased marine productivity during sub-stages 5d and 5b. Both, terrigenous input and marine productivity would be strongly controlled by changes in the Intertropical Convergence Zone and winds associated with the South Atlantic Convergence Zone. Thus, NE winds would have prevailed promoting humidity and precipitation rates over SE Brazil, as well as, an intensified wind-driven upwelling and eddies associated with the Brazil Current, which favored the presence of a shallow nutricline. Our results are consistent with that of different proxies presented in other studies providing estimates of changes on the precipitation rate of SE Brazil and changes on marine productivity in the South Atlantic Ocean during MIS 5. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68493
Appears in Collections:过去全球变化的重建

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作者单位: Laboratório de Paleoceanografia do Atlântico Sul, Instituto Oceanográfico, Universidade de São Paulo, Praça do Oceanográfico, 191 Cidade Universitária, São Paulo, SP, Brazil

Recommended Citation:
Costa K.B.,Cabarcos E.,Santarosa A.C.A.,et al. A multiproxy approach to the climate and marine productivity variations along MIS 5 in SE Brazil: A comparison between major components of calcareous nannofossil assemblages and geochemical records[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,449
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