Atmospheric CO2 and climate on millennial time scales during the last glacial period

被引：215

作者：

Ahn, Jinho ^{[1
]}

Brook, Edward J. ^{[1
]}

机构：

[1] Oregon State Univ, Dept Geosci, Corvallis, OR 97331 USA

来源：

SCIENCE | 2008年 / 322卷 / 5898期

关键词：

D O I：

10.1126/science.1160832

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：

Reconstructions of ancient atmospheric carbon dioxide (CO2) variations help us better understand how the global carbon cycle and climate are linked. We compared CO2 variations on millennial time scales between 20,000 and 90,000 years ago with an Antarctic temperature proxy and records of abrupt climate change in the Northern Hemisphere. CO2 concentration and Antarctic temperature were positively correlated over millennial- scale climate cycles, implying a strong connection to Southern Ocean processes. Evidence from marine sediment proxies indicates that CO2 concentration rose most rapidly when North Atlantic Deep Water shoaled and stratification in the Southern Ocean was reduced. These increases in CO2 concentration occurred during stadial (cold) periods in the Northern Hemisphere, several thousand years before abrupt warming events in Greenland.

引用

页码：83 / 85

页数：3

共 33 条

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