The Mid-Pleistocene climate transition as documented in the deep South Atlantic Ocean: initiation, interim state and terminal event

被引：128

作者：

Schmieder, F ^{[1
]}

von Dobeneck, T ^{[1
]}

Bleil, U ^{[1
]}

机构：

[1] Univ Bremen, Fachbereich Geowissensch, D-28334 Bremen, Germany

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2000年 / 179卷 / 3-4期

关键词：

pleistocene; global change; magnetic susceptibility; South Atlantic; glacial extent; thermohaline circulation;

D O I：

10.1016/S0012-821X(00)00143-6

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The Mid-Pleistocene transition (MPT) of the global climate system, initiated by a shift towards much larger northern hemisphere ice shields at around 920 ka and ending with predominance of 100 kyr ice age cyclicity since about 640 ka, is one of the fundamental enigmas in Quaternary climate evolution. Climate proxy records not exclusively linked to global ice volume are necessary to advance understanding of the MPT. Here we present a high-resolution Pleistocene magnetic susceptibility time series of 12 sediment cores from the subtropical South Atlantic essentially reflecting dissolution driven variations in carbonate accumulation controlled by changes in deep water circulation. In addition to characteristics known from delta(18)O records, the data sets reveal three remarkable features intimately related to the MPT: (1) an all-Pleistocene minimum of carbonate accumulation in the South Atlantic at 920 ka, (2) a MPT interim state of reduced carbonate deposition, indicating that the MPT period may have been a discrete state of the Pleistocene deep water circulation and climate system and (3) a terminal MPT event at around 540-530 ka documented in several peculiarities such as thick laminated layers of the giant diatom Ethmodiscus rex. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：539 / 549

页数：11

共 50 条

[21] A MID-BRUNHES CLIMATIC EVENT - LONG-TERM CHANGES IN GLOBAL ATMOSPHERE AND OCEAN CIRCULATION [J].

JANSEN, JHF ;

KUIJPERS, A ;

TROELSTRA, SR .

SCIENCE, 1986, 232 (4750) :619-622

[22]

KENT DV, 1982, NATURE, V299, P538, DOI 10.1038/299538a0

[23]

KUKLA G, 1988, GEOLOGY, V16, P811, DOI 10.1130/0091-7613(1988)016<0811:PCICDB>2.3.CO

[24]

[25]

Lisitzin A.P., 1996, Oceanic sedimentation: Lithology and geochemistry

[26] ORIGIN OF ETHMODISCUS OOZE [J].

MIKKELSEN, N .

MARINE MICROPALEONTOLOGY, 1977, 2 (01) :35-46

[27] Exploring the structure of the mid-Pleistocene revolution with advanced methods of time series analysis [J].

Mudelsee, M ;

Stattegger, K .

GEOLOGISCHE RUNDSCHAU, 1997, 86 (02) :499-511

[28] The Mid-Pleistocene climate transition: onset of 100 ka cycle lags ice volume build-up by 280 ka [J].

Mudelsee, M ;

Schulz, M .

EARTH AND PLANETARY SCIENCE LETTERS, 1997, 151 (1-2) :117-123

[29] The timing of Pleistocene glaciations from a simple multiple-state climate model [J].

Paillard, D .

NATURE, 1998, 391 (6665) :378-381

[30] THE EVOLUTION OF PLEISTOCENE CLIMATE - A TIME-SERIES APPROACH [J].

PISIAS, NG ;

MOORE, TC .

EARTH AND PLANETARY SCIENCE LETTERS, 1981, 52 (02) :450-458

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