El Nino-like pattern in ice age tropical Pacific sea surface temperature

被引：436

作者：

Koutavas, A ^{[1
]}

Lynch-Stieglitz, J

Marchitto, TM

Sachs, JP

机构：

[1] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA

[2] Columbia Univ, Dept Earth & Environm Sci, Palisades, NY 10964 USA

[3] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA

来源：

SCIENCE | 2002年 / 297卷 / 5579期

关键词：

D O I：

10.1126/science.1072376

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：

Sea surface temperatures (SSTs) in the cold tongue of the eastern equatorial Pacific exert powerful controls on global atmospheric circulation patterns. We examined climate variability in this region from the Last Glacial Maximum (LGM) to the present, using a SST record reconstructed from magnesium/calcium ratios in foraminifera from sea-floor sediments near the Galapagos Islands. Cold-tongue SST varied coherently with precession-induced changes in seasonality during the past 30,000 years. Observed LGM cooling of just 1.2degrees C implies a relaxation of tropical temperature gradients, weakened Hadley and Walker circulation, southward shift of the Intertropical Convergence Zone, and a persistent El Nino like pattern in the tropical Pacific. This is contrasted with mid-Holocene cooling suggestive of a La Nina like pattern with enhanced SST gradients and strengthened trade winds. Our results support a potent role for altered tropical Pacific SST gradients in global climate variations.

引用

页码：226 / 230

页数：6

共 43 条

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