气候变化领域集成服务门户(CCPortal): Pronounced summer warming in northwest Greenland during the Holocene and Last Interglacial

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DOI	10.1073/pnas.1720420115
	Pronounced summer warming in northwest Greenland during the Holocene and Last Interglacial
	McFarlin J.M.; Axford Y.; Osburn M.R.; Kelly M.A.; Osterberg E.C.; Farnsworth L.B.
发表日期	2018
ISSN	0027-8424
起始页码	6357
结束页码	6362
卷号	115 期号:25
英文摘要	Projections of future rates of mass loss from the Greenland Ice Sheet are highly uncertain because its sensitivity to warming is unclear. Geologic reconstructions of Quaternary interglacials can illustrate how the ice sheet responded during past warm periods, providing insights into ice sheet behavior and important tests for data-model comparisons. However, paleoclimate records from Greenland are limited: Early Holocene peak warmth has been quantified at only a few sites, and terrestrial sedimentary records of prior interglacials are exceptionally rare due to glacial erosion during the last glacial period. Here, we discuss findings from a lacustrine archive that records both the Holocene and the Last Interglacial (LIG) from Greenland, allowing for direct comparison between two interglacials. Sedimentary chironomid assemblages indicate peak July temperatures 4.0 to 7.0 °C warmer than modern during the Early Holocene maximum in summer insolation. Chaoborus and chironomids in LIG sediments indicate July temperatures at least 5.5 to 8.5 °C warmer than modern. These estimates indicate pronounced warming in northwest Greenland during both interglacials. This helps explain dramatic ice sheet thinning at Camp Century in northwest Greenland during the Early Holocene and, for the LIG, aligns with controversial estimates of Eemian warming from ice core data retrieved in northern Greenland. Converging geologic evidence for strong LIG warming is challenging to reconcile with inferred Greenland Ice Sheet extent during the LIG, and the two appear incompatible in many models of ice sheet evolution. An increase in LIG snowfall could help resolve this problem, pointing to the need for hydroclimate reconstructions from the region. © 2018 National Academy of Sciences. All Rights Reserved.
英文关键词	Eemian; Greenland; Holocene thermal maximum; Last Interglacial; Paleotemperature
语种	英语
scopus关键词	Article; environmental temperature; greenhouse effect; Greenland; Holocene; interglacial; priority journal; summer
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158880
作者单位	McFarlin, J.M., Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, United States; Axford, Y., Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, United States; Osburn, M.R., Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, United States; Kelly, M.A., Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, United States; Osterberg, E.C., Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, United States; Farnsworth, L.B., Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, United States
推荐引用方式 GB/T 7714	McFarlin J.M.,Axford Y.,Osburn M.R.,et al. Pronounced summer warming in northwest Greenland during the Holocene and Last Interglacial[J],2018,115(25).
APA	McFarlin J.M.,Axford Y.,Osburn M.R.,Kelly M.A.,Osterberg E.C.,&Farnsworth L.B..(2018).Pronounced summer warming in northwest Greenland during the Holocene and Last Interglacial.Proceedings of the National Academy of Sciences of the United States of America,115(25).
MLA	McFarlin J.M.,et al."Pronounced summer warming in northwest Greenland during the Holocene and Last Interglacial".Proceedings of the National Academy of Sciences of the United States of America 115.25(2018).