The mid-Pleistocene transition in the tropical Pacific

被引：180

作者：

Medina-Elizalde, M

Lea, DW ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Interdept Program Marine Sci, Santa Barbara, CA 93106 USA

[3] Univ Calif Santa Barbara, Inst Marine Sci, Santa Barbara, CA 93106 USA

来源：

SCIENCE | 2005年 / 310卷 / 5750期

关键词：

D O I：

10.1126/science.1115933

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A sea surface temperature (SST) record based on planktonic foraminiferal magnesium/calcium ratios from a site in the western equatorial Pacific warm pool reveals that glacial-interglacial oscillations in SST shifted from a period of 41,000 to 100,000 years at the mid-Pleistocene transition, 950,000 years before the present. SST changes at both periodicities were synchronous with eastern Pacific cold-tongue SSTs but preceded changes in continental ice volume. The timing and nature of tropical Pacific SST changes over the mid-Pleistocene transition implicate a shift in the periodicity of radiative forcing by atmospheric carbon dioxide as the cause of the switch in climate periodicities at this time.

引用

页码：1009 / 1012

页数：4

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