气候变化领域集成服务门户(CCPortal): Environmental changes in the East Equatorial Pacific during the Mid Pleistocene Transition and implications for the Last Global Extinction of benthic foraminifera

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DOI	10.1016/j.palaeo.2019.109487
	Environmental changes in the East Equatorial Pacific during the Mid Pleistocene Transition and implications for the Last Global Extinction of benthic foraminifera
	Diz P.; Peñalver-Clavel I.; Hernández-Almeida I.; Bernasconi S.M.
发表日期	2020
ISSN	0031-0182
卷号	539
英文摘要	The Mid Pleistocene Transition (MPT, ~1000–700 ka) represents the latest major change in the climate system, when the climate variability changed from ~ 41 to 100 kyr cycles. Changes are reflected in different components of the climate system including the marine biota. In this study we focus on studying the East Equatorial Pacific Ocean (EEP), a relevant area in the present and past climate regulation. We present a high-resolution record of benthic foraminifera from the Ocean Drilling Program Leg 202 Site 1242 (East Equatorial Pacific, 1364 m water depth) from MIS 18 to MIS 30 (716 to 1038 ka). The analysis of benthic foraminiferal assemblages allows to identify palaeoenvironments and to make inferences about the palaeoceanographic processes involved. Bottom waters were deficient in oxygen during mild glacials of Marine Isotopic Stage (MIS) 26 and 28, early MIS 23, glacial MIS 22, and the glacial-interglacial transitions of MIS 20/19 and MIS 18e/d. The overall sustained organic carbon regime suffered a major change during mid MIS 23 (890–900 ka). We interpret this change was caused by an increased influence the open ocean upwelling system of the Costa Rica Dome derivering labile organic carbon to the seafloor. Another substantial change occurred at mid MIS 19 and it is interpreted to involve a shift in the nature of the organic carbon arriving at the seafloor. This shift largely coincides with the disappearance of a group of mainly elongated benthic foraminifera, commonly known as the “Extinction Group”. Our findings suggest the arrival of a particular type of food, for which these foraminifera where not adapted, might have contributed to the final demise of this group of foraminifera in the East Equatorial Pacific. © 2019 Elsevier B.V.
英文关键词	Intertropical Convergence Zone; ODP 1242; Oxygen depletion; Phytoplankton blooms
语种	英语
scopus关键词	algal bloom; benthic foraminifera; environmental change; glacial-interglacial cycle; intertropical convergence zone; local extinction; marine isotope stage; Ocean Drilling Program; paleoceanography; paleoclimate; paleoenvironment; phytoplankton; Pleistocene; Costa Rica Dome; Pacific Ocean; Pacific Ocean (Equatorial); Foraminifera
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150643
作者单位	Departamento de Geociencias Marinas, Facultade de Ciencias, Universidade de Vigo, Campus Lagoas-Marcosende s/n, Vigo, 36310, Spain; Geological Institute, ETH Zürich, Zürich, 8092, Switzerland
推荐引用方式 GB/T 7714	Diz P.,Peñalver-Clavel I.,Hernández-Almeida I.,et al. Environmental changes in the East Equatorial Pacific during the Mid Pleistocene Transition and implications for the Last Global Extinction of benthic foraminifera[J],2020,539.
APA	Diz P.,Peñalver-Clavel I.,Hernández-Almeida I.,&Bernasconi S.M..(2020).Environmental changes in the East Equatorial Pacific during the Mid Pleistocene Transition and implications for the Last Global Extinction of benthic foraminifera.Palaeogeography, Palaeoclimatology, Palaeoecology,539.
MLA	Diz P.,et al."Environmental changes in the East Equatorial Pacific during the Mid Pleistocene Transition and implications for the Last Global Extinction of benthic foraminifera".Palaeogeography, Palaeoclimatology, Palaeoecology 539(2020).