气候变化领域集成服务门户(CCPortal): Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas

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DOI	10.1016/j.quascirev.2020.106461
	Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas
	Wittmeier H.E.; Schaefer J.M.; Bakke J.; Rupper S.; Paasche Ø.; Schwartz R.; Finkel R.C.
发表日期	2020
ISSN	0277-3791
卷号	245
英文摘要	Climate changes during the Late Glacial period (LG; 15-11 ka) as recorded in Greenland and Antarctic ice cores show a bipolar pattern. Between 14.5 ka and 13 ka ago, the northern latitudes experienced the Bølling/Allerød (BA) warm period, while southern records feature the Antarctic Cold Reversal (ACR). Between 12.9 ka and 11.7 ka ago, the north was under the Younger Dryas (YD) cold spell while southern latitude temperature rose in parallel to atmospheric CO2 concentrations. While the southern hemisphere pattern is well documented in mountain glacier moraine records from New Zealand and Patagonia, in northern mid-latitudes and the Arctic, the LG glacier culmination has been connected to the YD stadial, apparently confirming the bipolar pattern. We present a geomorphic map of mountain glaciers in Arctic Norway, a cosmogenic nuclide chronology from 71 moraine boulders from the LG and the Holocene, and first-order glacier modeling experiments. The model and dating results show that the studied mountain glaciers are most sensitive to summer-temperature change, that their response to those changes is highly correlated to a wider region and that these mountain glaciers in Arctic Norway reached their maximum LG extent about 14 ka ago, prior to the YD. Following considerable retreat through the first part of the YD, glaciers re-stabilized in the mid-YD and showed slower oscillatory retreat through the latter part of the YD. We compare this glacier pattern to updated earlier glacier records in the wider Arctic and North Atlantic region and propose a pattern of coherent glacier response to climate changes during this interval. The LG results from Arctic glaciers show consistency to the glacier record from New Zealand and Patagonia. This first-order interhemispheric coherency of LG mountain glacier fluctuations driven mainly by summer temperature would support the view that the bipolar seesaw was primarily a northern winter phenomenon during the LG period, and the YD in particular. More similar experiments need to be performed to further test this scenario. © 2020 The Author(s)
英文关键词	Cosmogenic isotopes; Glaciation; North Atlantic; Paleoclimatology; Pleistocene
语种	英语
scopus关键词	Atmospheric temperature; Climate change; Landforms; Antarctic cold reversals; Antarctic ice core; Cosmogenic nuclide chronology; Model experiments; Northern latitudes; Southern Hemisphere; Southern latitudes; Summer temperature; Glacial geology; Allerod; Bolling; carbon dioxide; chronology; climate change; glacier retreat; Holocene; ice core; late glacial; midlatitude environment; moraine; Southern Hemisphere; Younger Dryas; Arctic; Atlantic Ocean; Atlantic Ocean (North); Greenland; New Zealand; Norway; Patagonia
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151343
作者单位	Department of Earth Science, University of Bergen, Allégaten 41, Bergen, N-5007, Norway; Bjerknes Center for Climate Research, Allégaten 41, Bergen, N-5007, Norway; Lamont-Doherty Earth Observatory, Geochemistry, Palisades, NY 10964, United States; Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027, United States; Department of Geography, University of Utah, 260 S Central Campus Dr., Salt Lake City, UT 84112, United States; University of California, Berkeley, Department of Earth and Planetary Sciences, Berkeley, CA 95064, United States
推荐引用方式 GB/T 7714	Wittmeier H.E.,Schaefer J.M.,Bakke J.,et al. Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas[J],2020,245.
APA	Wittmeier H.E..,Schaefer J.M..,Bakke J..,Rupper S..,Paasche Ø..,...&Finkel R.C..(2020).Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas.Quaternary Science Reviews,245.
MLA	Wittmeier H.E.,et al."Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas".Quaternary Science Reviews 245(2020).