Coupling of CO2 and Ice Sheet Stability Over Major Climate Transitions of the Last 20 Million Years

被引：303

作者：

Tripati, Aradhna K. ^{[1
,2
,3
,4
]}

Roberts, Christopher D. ^{[4
]}

Eagle, Robert A. ^{[5
]}

机构：

[1] Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA

[2] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA

[3] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA

[4] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England

[5] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

来源：

SCIENCE | 2009年 / 326卷 / 5958期

关键词：

ATMOSPHERIC CARBON-DIOXIDE; MIOCENE; MIDDLE; PACIFIC; STRATIFICATION; DECLINE; RATIOS; RECORD; MA; PH;

D O I：

10.1126/science.1178296

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：

070301 [无机化学]; 070403 [天体物理学]; 070507 [自然资源与国土空间规划学]; 090105 [作物生产系统与生态工程];

摘要：

The carbon dioxide (CO2) content of the atmosphere has varied cyclically between similar to 180 and similar to 280 parts per million by volume over the past 800,000 years, closely coupled with temperature and sea level. For earlier periods in Earth's history, the partial pressure of CO2 (pCO(2)) is much less certain, and the relation between pCO(2) and climate remains poorly constrained. We use boron/calcium ratios in foraminifera to estimate pCO(2) during major climate transitions of the past 20 million years. During the Middle Miocene, when temperatures were similar to 3 degrees to 6 degrees C warmer and sea level was 25 to 40 meters higher than at present, pCO(2) appears to have been similar to modern levels. Decreases in pCO(2) were apparently synchronous with major episodes of glacial expansion during the Middle Miocene (similar to 14 to 10 million years ago) and Late Pliocene (similar to 3.3 to 2.4 million years ago).

引用

页码：1394 / 1397

页数：4

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