Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/NGEO2888 |
Enhanced weathering and CO2 drawdown caused by latest Eocene strengthening of the Atlantic meridional overturning circulation | |
Elsworth, Genevieve1; Galbraith, Eric1,2,3,4; Halverson, Galen1; Yang, Simon5 | |
2017-03-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; Spain; Switzerland |
英文摘要 | On timescales significantly greater than 105 years, atmospheric p(CO2) is controlled by the rate of mantle outgassing relative to the set-point of the silicate weathering feedback. The weathering set-point has been shown to depend on the distribution and characteristics of rocks exposed at the Earth's surface, vegetation types and topography. Here we argue that large-scale climate impacts caused by changes in ocean circulation can also modify the weathering set-point and show evidence suggesting that this played a role in the establishment of the Antarctic ice sheet at the Eocene-Oligocene boundary. In our simulations, tectonic deepening of the Drake Passage causes freshening and stratification of the Southern Ocean, strengthening the Atlantic meridional overturning circulation and consequently raising temperatures and intensifying rainfall over land. These simulated changes are consistent with late Eocene tectonic reconstructions that show Drake Passage deepening, and with sediment records that reveal Southern Ocean stratification, the emergence of North Atlantic Deep Water, and a hemispherically asymmetric temperature change. These factors would have driven intensified silicate weathering and can thereby explain the drawdown of carbon dioxide that has been linked with Antarctic ice sheet growth. We suggest that this mechanism illustrates another way in which ocean-atmosphere climate dynamics can introduce nonlinear threshold behaviour through interaction with the geologic carbon cycle. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000395791400014 |
WOS关键词 | OLIGOCENE TRANSITION ; ANTARCTIC GLACIATION ; SURFACE-TEMPERATURE ; CLIMATE TRANSITION ; ATMOSPHERIC CO2 ; CARBON-DIOXIDE ; OCEAN ; CYCLE ; SEA ; PRODUCTIVITY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34833 |
专题 | 地球科学 气候变化 |
作者单位 | 1.McGill Univ, Dept Earth & Planetary Sci, 3450 Univ St, Montreal, PQ H3A 0E8, Canada; 2.ICREA, Barcelona 08010, Spain; 3.Univ Autonoma Barcelona, ICTA, E-08193 Barcelona, Spain; 4.Univ Autonoma Barcelona, Dept Math, E-08193 Barcelona, Spain; 5.Swiss Fed Inst Technol, Dept Environm Syst Sci, Univ Str 16, CH-8092 Zurich, Switzerland |
推荐引用方式 GB/T 7714 | Elsworth, Genevieve,Galbraith, Eric,Halverson, Galen,et al. Enhanced weathering and CO2 drawdown caused by latest Eocene strengthening of the Atlantic meridional overturning circulation[J]. NATURE GEOSCIENCE,2017,10(3). |
APA | Elsworth, Genevieve,Galbraith, Eric,Halverson, Galen,&Yang, Simon.(2017).Enhanced weathering and CO2 drawdown caused by latest Eocene strengthening of the Atlantic meridional overturning circulation.NATURE GEOSCIENCE,10(3). |
MLA | Elsworth, Genevieve,et al."Enhanced weathering and CO2 drawdown caused by latest Eocene strengthening of the Atlantic meridional overturning circulation".NATURE GEOSCIENCE 10.3(2017). |
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