Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/s41561-018-0205-6 |
Flushing of the deep Pacific Ocean and the deglacial rise of atmospheric CO2 concentrations | |
Du, Jianghui1; Haley, Brian A.1; Mix, Alan C.1; Walczak, Maureen H.1; Praetorius, Summer K.2 | |
2018-10-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:10页码:749-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | During the last deglaciation (19,000-9,000 years ago), atmospheric CO2 increased by about 80 ppm. Understanding the mechanisms responsible for this change is a central theme of palaeoclimatology, relevant for predicting future CO2 transfers in a warming world. Deglacial CO2 rise hypothetically tapped an accumulated deep Pacific carbon reservoir, but the processes remain elusive as they are underconstrained by existing tracers. Here we report high-resolution authigenic neodymium isotope data in North Pacific sediment cores and infer abyssal Pacific overturning weaker than today during the Last Glacial Maximum but intermittently stronger during steps of deglacial CO2 rise. Radiocarbon evidence suggestive of relatively 'old' deglacial deep Pacific water is reinterpreted here as an increase in preformed C-14 age of subsurface waters sourced near Antarctica, consistent with movement of aged carbon out of the deep ocean and release of CO2 to the atmosphere during the abyssal flushing events. The timing of neodymium isotope changes suggests that deglacial acceleration of Pacific abyssal circulation tracked Southern Hemisphere warming, sea-ice retreat and increase of mean ocean temperature. The inferred magnitude of circulation changes is consistent with deep Pacific flushing as a significant, and perhaps dominant, control of the deglacial rise of atmospheric CO2. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000446089100012 |
WOS关键词 | NEODYMIUM ISOTOPIC COMPOSITION ; GLOBAL OVERTURNING CIRCULATION ; SEA SEDIMENTS IMPLICATIONS ; NORTH PACIFIC ; LAST DEGLACIATION ; SOUTH-PACIFIC ; CARBON-DIOXIDE ; BOUNDARY EXCHANGE ; AUTHIGENIC PHASES ; WEST ANTARCTICA |
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/35061 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA; 2.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA |
推荐引用方式 GB/T 7714 | Du, Jianghui,Haley, Brian A.,Mix, Alan C.,et al. Flushing of the deep Pacific Ocean and the deglacial rise of atmospheric CO2 concentrations[J]. NATURE GEOSCIENCE,2018,11(10):749-+. |
APA | Du, Jianghui,Haley, Brian A.,Mix, Alan C.,Walczak, Maureen H.,&Praetorius, Summer K..(2018).Flushing of the deep Pacific Ocean and the deglacial rise of atmospheric CO2 concentrations.NATURE GEOSCIENCE,11(10),749-+. |
MLA | Du, Jianghui,et al."Flushing of the deep Pacific Ocean and the deglacial rise of atmospheric CO2 concentrations".NATURE GEOSCIENCE 11.10(2018):749-+. |
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