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DOI | 10.1038/s41561-018-0169-6 |
Deglacial floods in the Beaufort Sea preceded Younger Dryas cooling | |
Keigwin, L. D.1; Klotsko, S.2; Zhao, N.1; Reilly, B.3; Giosan, L.1; Driscoll, N. W.2 | |
2018-08-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:8页码:599-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A period of cooling about 13,000 years ago interrupted about 2,000 years of deglacial warming. Known as the Younger Dryas (YD), the event is thought to have resulted from a slowdown of the Atlantic meridional overturning circulation in response to a sudden flood of Laurentide Ice Sheet meltwater that reached the Nordic Seas. Oxygen isotope evidence for a local source of meltwater to the open western North Atlantic from the Gulf of St Lawrence has been lacking. Here we report that the eastern Beaufort Sea contains the long-sought signal of O-18-depleted water. Beginning at similar to 12.94 +/- 0.15 thousand years ago, oxygen isotopes in the planktonic foraminifera from two sediment cores as well as sediment and seismic data indicate a flood of meltwater, ice and sediment to the Arctic via the Mackenzie River that lasted about 700 years. The minimum in the oxygen isotope ratios lasted similar to 130 years. We suggest that the floodwater travelled north along the Canadian Archipelago and then through the Fram Strait to the Nordic Seas, where freshening and freezing near sites of deep-water formation would have suppressed convection and caused the YD cooling by reducing the meridional overturning. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000440301400014 |
WOS关键词 | LAURENTIDE ICE-SHEET ; OXYGEN-ISOTOPE COMPOSITION ; DEEP ARCTIC-OCEAN ; FRESH-WATER ; NORTH-ATLANTIC ; LAKE AGASSIZ ; MELTWATER ; MARGIN ; DRAINAGE ; CLIMATE |
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/34715 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA; 2.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA; 3.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA |
推荐引用方式 GB/T 7714 | Keigwin, L. D.,Klotsko, S.,Zhao, N.,et al. Deglacial floods in the Beaufort Sea preceded Younger Dryas cooling[J]. NATURE GEOSCIENCE,2018,11(8):599-+. |
APA | Keigwin, L. D.,Klotsko, S.,Zhao, N.,Reilly, B.,Giosan, L.,&Driscoll, N. W..(2018).Deglacial floods in the Beaufort Sea preceded Younger Dryas cooling.NATURE GEOSCIENCE,11(8),599-+. |
MLA | Keigwin, L. D.,et al."Deglacial floods in the Beaufort Sea preceded Younger Dryas cooling".NATURE GEOSCIENCE 11.8(2018):599-+. |
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