Climate impact of late quaternary equatorial Pacific sea surface temperature variations

被引：810

作者：

Lea, DW ^{[1
]}

Pak, DK

Spero, HJ

机构：

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

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

[3] Univ Calif Davis, Dept Geol, Davis, CA 95616 USA

来源：

SCIENCE | 2000年 / 289卷 / 5485期

关键词：

D O I：

10.1126/science.289.5485.1719

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：

Magnesium/calcium data from planktonic foraminifera in equatorial Pacific sediment cores demonstrate that tropical Pacific sea surface temperatures (SSTs) were 2.8 degrees +/- 0.7 degrees C colder than the present at the Last glacial maximum. Glacial-interglacial temperature differences as great as 5 degrees C are observed over the Last 450 thousand years. Changes in SST coincide with changes in Antarctic air temperature and precede changes in continental ice volume by about 3 thousand years, suggesting that tropical cooling played a major role in driving ice-age climate. Comparison of SST estimates from eastern and western sites indicates that the equatorial Pacific zonal SST gradient was similar or somewhat Larger during glacial episodes. Extraction of a salinity proxy from the magnesium/calcium and oxygen isotope data indicates that transport of water vapor into the western Pacific was enhanced during glacial episodes.

引用

页码：1719 / 1724

页数：8

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