气候变化领域集成服务门户(CCPortal): Ice-Wedge Evidence of Holocene Winter Warming in the Canadian Arctic

CCPortal

DOI	10.1029/2020GL087942
	Ice-Wedge Evidence of Holocene Winter Warming in the Canadian Arctic
	Holland K.M.; Porter T.J.; Froese D.G.; Kokelj S.V.; Buchanan C.A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:12
英文摘要	Arctic summer temperatures mostly cooled over the last ~7 kyr, owing to decreasing summer insolation. However, knowledge of the winter season is limited in the Arctic paleoclimate literature. Here we develop a composite record of δ18O from ice wedges—a winter precipitation archive—to reconstruct changes in winter climate in the northwestern Canadian Arctic since ~7.4 kyr b2k. Our record shows a long-term δ18O enrichment (+(0.14 ± 0.10)‰ kyr−1), suggesting winter temperatures increased since the mid-Holocene, a finding that is corroborated by reconstructions from the Siberian Arctic. Winter warming over the last ~7 kyr is consistent with increasing winter insolation and greenhouse gas forcing. This study provides some of the first insights on the sensitivity of winter temperatures in the Canadian Arctic to past, and potentially future, climate forcings, and contributes to a more seasonally holistic understanding of the Arctic system. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Greenhouse gases; 18O enrichment; Canadian Arctic; Climate forcings; Greenhouse-gas forcing; Paleoclimates; Summer temperature; Winter precipitation; Winter seasons; Incident solar radiation; air temperature; climate variation; Holocene; ice shelf; insolation; oxygen isotope; paleoclimate; reconstruction; warming; Canada; Canadian Arctic; Siberia
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170219
作者单位	Department of Geography, University of Toronto Mississauga, Mississauga, ON, Canada; Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada; Northwest Territories Geological Survey, Government of Northwest Territories, Yellowknife, NT, Canada
推荐引用方式 GB/T 7714	Holland K.M.,Porter T.J.,Froese D.G.,et al. Ice-Wedge Evidence of Holocene Winter Warming in the Canadian Arctic[J],2020,47(12).
APA	Holland K.M.,Porter T.J.,Froese D.G.,Kokelj S.V.,&Buchanan C.A..(2020).Ice-Wedge Evidence of Holocene Winter Warming in the Canadian Arctic.Geophysical Research Letters,47(12).
MLA	Holland K.M.,et al."Ice-Wedge Evidence of Holocene Winter Warming in the Canadian Arctic".Geophysical Research Letters 47.12(2020).