气候变化领域集成服务门户(CCPortal): High-frequency climate variability in the Holocene from a coastal-dome ice core in east-central Greenland

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DOI	10.5194/cp-16-1369-2020
	High-frequency climate variability in the Holocene from a coastal-dome ice core in east-central Greenland
	Hughes A.G.; Jones T.R.; Vinther B.M.; Gkinis V.; Max Stevens C.; Morris V.; Vaughn B.H.; Holme C.; Markle B.R.; White J.W.C.
发表日期	2020
ISSN	18149324
起始页码	1369
结束页码	1386
卷号	16 期号:4
英文摘要	An ice core drilled on the Renland ice cap in eastcentral Greenland contains a continuous climate record dating through the last glacial period. The Renland record is valuable because the coastal environment is more likely to reflect regional sea surface conditions compared to inland Greenland ice cores that capture synoptic variability. Here we present the δ18O water isotope record for the Holocene, in which decadal-scale climate information is retained for the last 8 kyr, while the annual water isotope signal is preserved throughout the last 2.6 kyr. To investigate regional climate information preserved in the water isotope record, we apply spectral analysis techniques to a 300-year moving window to determine the mean strength of varying frequency bands through time. We find that the strength of 15-20-year δ18O variability exhibits a millennial-scale signal in line with the well-known Bond events. Comparison to other North Atlantic proxy records suggests that the 15-20-year variability may reflect fluctuating sea surface conditions throughout the Holocene, driven by changes in the strength of the Atlantic Meridional Overturning Circulation. Additional analysis of the seasonal signal over the last 2.6 kyr reveals that the winter δ18O signal has experienced a decreasing trend, while the summer signal has predominantly remained stable. The winter trend may correspond to an increase in Arctic sea ice cover, which is driven by a decrease in total annual insolation, and is also likely influenced by regional climate variables such as atmospheric and oceanic circulation. In the context of anthropogenic climate change, the winter trend may have important implications for feedback processes as sea ice retreats in the Arctic. © 2020 Author(s).
语种	英语
scopus关键词	climate variation; coastal zone; dome; Holocene; ice cap; ice core; insolation; oceanic circulation; oxygen isotope ratio; proxy climate record; sea ice; seasonality; spectral analysis; Arctic; Atlantic Ocean; Atlantic Ocean (North); Greenland; Greenland Ice Sheet
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146689
作者单位	Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; Physics of Ice Climate and Earth, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Hughes A.G.,Jones T.R.,Vinther B.M.,et al. High-frequency climate variability in the Holocene from a coastal-dome ice core in east-central Greenland[J],2020,16(4).
APA	Hughes A.G..,Jones T.R..,Vinther B.M..,Gkinis V..,Max Stevens C..,...&White J.W.C..(2020).High-frequency climate variability in the Holocene from a coastal-dome ice core in east-central Greenland.Climate of the Past,16(4).
MLA	Hughes A.G.,et al."High-frequency climate variability in the Holocene from a coastal-dome ice core in east-central Greenland".Climate of the Past 16.4(2020).