globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.03.020
Scopus记录号: 2-s2.0-85017101608
论文题名:
Asynchronous instability of the North American-Arctic and Greenland ice sheets during the last deglaciation
作者: Jackson R.; Carlson A.E.; Hillaire-Marcel C.; Wacker L.; Vogt C.; Kucera M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 164
起始页码: 140
结束页码: 153
语种: 英语
英文关键词: Baffin Bay ; Detrital carbonate events ; Glaciology (inc. paleo-ice sheets) ; Ice-sheet retreat ; Last deglaciation ; Quaternary ; Radiocarbon dating ; Sedimentology – marine cores
Scopus关键词: Carbonation ; Glaciers ; Sea ice ; Baffin Bay ; Detrital carbonate ; Ice sheet ; Ice-sheet retreat ; Last deglaciation ; Marine cores ; Quaternary ; Radiocarbon dating ; Ice
英文摘要: The chronology of deglacial meltwater pulses from the Laurentide Ice Sheet is well documented. However, the deglacial history of the North American-Arctic (north-eastern Laurentide and Innuitian) and western Greenland ice sheets draining into the Labrador Sea via Baffin Bay is less well constrained. Here we present new high-resolution, radiocarbon-dated records from the central Baffin Bay spanning ∼17 to 10 kyr BP and documenting the full deglacial history of Baffin Bay. Sedimentological and geochemical data confirm the presence of two periods of enhanced detrital carbonate delivery, termed Baffin Bay Detrital Carbonate Events (BBDCs). These events are dated to ∼14.2–13.7 kyr BP and ∼12.7–11 kyr BP. They are synchronous across Baffin Bay and their mineralogical signature indicates a common source of detrital carbonate from northern Baffin Bay. The first event, BBDC 1, postdates Heinrich Event 1 and the second event, BBDC 0, predates the recently revised timing of Heinrich Event 0. The onset of the BBDC events appears not to be systematically linked to Greenland temperature change as they occur during both interstadial and stadial periods. This indicates that deglaciation of North American-Arctic and western Greenland ice sheets with the associated iceberg and meltwater discharge were decoupled from the dominant North Atlantic climate mode, where iceberg discharge events from the Laurentide Ice Sheet occurred during stadial periods. © 2017 Elsevier Ltd
资助项目: We thank the captain and crew of RV Maria S. Merian for support during the expedition MSM09/2 and Hartmut Schulz for help with curation of the sediment cores. The manuscript benefited from comments by Paul Knutz and two anonymous referees of an earlier version and comments from David Piper and an anonymous referee. R. Jackson would also like to thank S. Mulitza for help with the BACON age-modelling. This project was supported by the Deutsche Forschungsgemeinschaft (DFG) (Grant no. 1904) through the International Research Training Group “Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic” (IRTG 1904 ArcTrain). A.E. Carlson notes support from the U.S. National Science Foundation Polar Programs (ANS-1418074).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59241
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作者单位: MARUM – Centre for Marine Environmental Sciences, Leobener Straße 8, Bremen, Germany; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; GEOTOP, Université du Québec à Montréal, CP 8888, Succ. Centre-Ville, Montréal, Québec, Canada; Laboratory of Ion Beam Physics, ETHZ, Otto-Stern-Weg 5, Zürich, Switzerland; Zentrallabor für Kristallographie und Angewandte Materialwissenschaften (ZEKAM), Department of Geoscience, Universität Bremen, Klagenfurter Str., Bremen, Germany

Recommended Citation:
Jackson R.,Carlson A.E.,Hillaire-Marcel C.,et al. Asynchronous instability of the North American-Arctic and Greenland ice sheets during the last deglaciation[J]. Quaternary Science Reviews,2017-01-01,164
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