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DOI | 10.1073/pnas.1702143114 |
Causes of ice age intensification across the Mid-Pleistocene Transition | |
Chalk, Thomas B.1,2; Hain, Mathis P.1; Foster, Gavin L.1; Rohling, Eelco J.1,3; Sexton, Philip F.4; Badger, Marcus P. S.4,5; Cherry, Soraya G.1; Hasenfratz, Adam P.6; Haug, Gerald H.7; Jaccard, Samuel L.8,9; Martinez-Garcia, Alfredo7; Palike, Heiko1,10; Pancost, Richard D.5; Wilson, Paul A.1 | |
2017-12-12 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2017 |
卷号 | 114期号:50页码:13114-13119 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA; Australia; Switzerland; Germany |
英文摘要 | During the Mid-Pleistocene Transition (MPT; 1,200-800 kya), Earth's orbitally paced ice age cycles intensified, lengthened from similar to 40,000 (similar to 40 ky) to similar to 100 ky, and became distinctly asymmetrical. Testing hypotheses that implicate changing atmospheric CO2 levels as a driver of the MPT has proven difficult with available observations. Here, we use orbitally resolved, boron isotope CO2 data to show that the glacial to interglacial CO2 difference increased from similar to 43 to similar to 75 mu atm across the MPT, mainly because of lower glacial CO2 levels. Through carbon cycle modeling, we attribute this decline primarily to the initiation of substantive dust-borne iron fertilization of the Southern Ocean during peak glacial stages. We also observe a twofold steepening of the relationship between sea level and CO2-related climate forcing that is suggestive of a change in the dynamics that govern ice sheet stability, such as that expected from the removal of subglacial regolith or interhemispheric ice sheet phase-locking. We argue that neither ice sheet dynamics nor CO2 change in isolation can explain the MPT. Instead, we infer that the MPT was initiated by a change in ice sheet dynamics and that longer and deeper post-MPT ice ages were sustained by carbon cycle feedbacks related to dust fertilization of the Southern Ocean as a consequence of larger ice sheets. |
英文关键词 | boron isotopes MPT geochemistry carbon dioxide paleoclimate |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417806200045 |
WOS关键词 | MIDDLE PLEISTOCENE TRANSITION ; DEEP-WATER CIRCULATION ; LAST GLACIAL MAXIMUM ; BORON ISOTOPE ; ATMOSPHERIC CO2 ; SEA-LEVEL ; FORAMINIFERAL CALCITE ; CLIMATE TRANSITION ; CARBON-DIOXIDE ; CARIBBEAN SEA |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
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/204834 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Southampton, Natl Oceanog Ctr Southampton, Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England; 2.Woods Hole Oceanog Inst, Dept Phys Oceanog, Woods Hole, MA 02543 USA; 3.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601, Australia; 4.Open Univ, Sch Environm Earth & Ecosyst Sci, Milton Keynes MK7 6AA, Bucks, England; 5.Univ Bristol, Cabot Inst, Sch Chem, Organ Geochem Unit, Bristol BS8 1TS, Avon, England; 6.ETH, Geol Inst, CH-8092 Zurich, Switzerland; 7.Max Planck Inst Chem, D-55128 Mainz, Germany; 8.Univ Bern, Inst Geol Sci, CH-3012 Bern, Switzerland; 9.Univ Bern, Oeschger Ctr Climate Change Res, CH-3012 Bern, Switzerland; 10.Univ Bremen, Ctr Marine Environm Sci MARUM, D-28359 Bremen, Germany |
推荐引用方式 GB/T 7714 | Chalk, Thomas B.,Hain, Mathis P.,Foster, Gavin L.,et al. Causes of ice age intensification across the Mid-Pleistocene Transition[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(50):13114-13119. |
APA | Chalk, Thomas B..,Hain, Mathis P..,Foster, Gavin L..,Rohling, Eelco J..,Sexton, Philip F..,...&Wilson, Paul A..(2017).Causes of ice age intensification across the Mid-Pleistocene Transition.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(50),13114-13119. |
MLA | Chalk, Thomas B.,et al."Causes of ice age intensification across the Mid-Pleistocene Transition".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.50(2017):13114-13119. |
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