globalchange  > 气候变化事实与影响
DOI: 10.1002/2015GB005257
Scopus记录号: 2-s2.0-84959449854
论文题名:
Multidecadal variations in Southern Hemisphere atmospheric 14C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO2 anomaly
作者: Turney C; S; M; , Palmer J; , Hogg A; , Fogwill C; J; , Jones R; T; , Bronk Ramsey C; , Fenwick P; , Grierson P; , Wilmshurst J; , O'Donnell A; , Thomas Z; A; , Lipson M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期:2
起始页码: 211
结束页码: 218
语种: 英语
英文关键词: interhemispheric gradient (IHG) ; Little Ice Age (LIA) ; radiocarbon (14C) ; Southern Hemisphere carbon dioxide (CO2) ; Southern Ocean ; tree rings
Scopus关键词: abyssal zone ; carbon cycle ; carbon dioxide ; carbon isotope ; carbon sink ; cooling ; decadal variation ; Little Ice Age ; Northern Hemisphere ; radiocarbon dating ; Southern Hemisphere ; tree ring ; upwelling ; Arctic ; Southern Ocean
英文摘要: Northern Hemisphere-wide cooling during the Little Ice Age (LIA; 1650-1775 Common Era, C.E.) was associated with a ~5 ppmv decrease in atmospheric carbon dioxide. Changes in terrestrial and ocean carbon reservoirs have been postulated as possible drivers of this relatively large shift in atmospheric CO2, potentially providing insights into the mechanisms and sensitivity of the global carbon cycle. Here we report decadally resolved radiocarbon (14C) levels in a network of tree-ring series spanning 1700-1950 C.E. located along the northern boundary of, and within, the Southern Ocean. We observe regional dilutions in atmospheric radiocarbon (relative to the Northern Hemisphere) associated with upwelling of 14CO2-depleted abyssal waters. We find the interhemispheric 14C offset approaches zero during increasing global atmospheric CO2 at the end of the LIA, with reduced ventilation in the Southern Ocean and a Northern Hemisphere source of old carbon (most probably originating from deep Arctic peat layers). The coincidence of the atmospheric CO2 increase and reduction in the interhemispheric 14C offset imply a common climate control. Possible mechanisms of synchronous change in the high latitudes of both hemispheres are discussed. ©2016. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:8   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77881
Appears in Collections:气候变化事实与影响

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作者单位: Climate Change Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, Australia; Waikato Radiocarbon Laboratory, University of Waikato, Hamilton, New Zealand; Department of Geography, Exeter University, Devon, United Kingdom; Research Laboratory for Archaeology and the History of Art, University of Oxford, Oxford, United Kingdom; Gondwana Tree-Ring Laboratory, Canterbury, New Zealand; Ecosystems Research Group, School of Plant Biology, University of Western Australia, Crawley, WA, Australia; Landcare Research, Lincoln, New Zealand; School of Environment, University of Auckland, Auckland, New Zealand

Recommended Citation:
Turney C,S,M,et al. Multidecadal variations in Southern Hemisphere atmospheric 14C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO2 anomaly[J]. Global Biogeochemical Cycles,2016-01-01,30(2)
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