A 25,000-year tropical climate history from Bolivian ice cores

被引：505

作者：

Thompson, LG ^{[1
]}

Davis, ME

Mosley-Thompson, E

Sowers, TA

Henderson, KA

Zagorodnov, VS

Lin, PN

Mikhalenko, VN

Campen, RK

Bolzan, JF

Cole-Dai, J

Francou, B

机构：

[1] Ohio State Univ, Dept Geol Sci, Byrd Polar Res Ctr, Columbus, OH 43210 USA

[2] Ohio State Univ, Dept Geog, Byrd Polar Res Ctr, Columbus, OH 43210 USA

[3] Penn State Univ, Dept Geosci, University Pk, PA 16802 USA

[4] Russian Acad Sci, Inst Geog, Moscow 109017, Russia

[5] ORSTOM, Quito, Ecuador

来源：

SCIENCE | 1998年 / 282卷 / 5395期

关键词：

D O I：

10.1126/science.282.5395.1858

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：

Ice cores that were recovered from the summit of Sajama mountain in Bolivia provide carbon-14-dated tropical records and extend to the Late Glacial Stage (LGS). Oxygen isotopic ratios of the ice decreased 5.4 per mil between the early Holocene and the Last Glacial Maximum, which is consistent with values from other ice cores, The abrupt onset and termination of a Younger Dryas-type event suggest atmospheric processes as the probable drivers. Regional accumulation increased during the LGS, during deglaciation, and over the past 3000 years, which is concurrent with higher water levels in regional paleolakes. Unlike polar cores, Sajama glacial ice contains eight times Less dust than the Holocene ice, which reflects wetter conditions and extensive snow cover.

引用

页码：1858 / 1864

页数：7

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