globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1720420115
论文题名:
Pronounced summer warming in northwest Greenland during the Holocene and Last Interglacial
作者: McFarlin J.M.; Axford Y.; Osburn M.R.; Kelly M.A.; Osterberg E.C.; Farnsworth L.B.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:25
起始页码: 6357
结束页码: 6362
语种: 英语
英文关键词: Eemian ; Greenland ; Holocene thermal maximum ; Last Interglacial ; Paleotemperature
Scopus关键词: Article ; environmental temperature ; greenhouse effect ; Greenland ; Holocene ; interglacial ; priority journal ; summer
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162098
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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

Recommended Citation:
McFarlin J.M.,Axford Y.,Osburn M.R.,et al. Pronounced summer warming in northwest Greenland during the Holocene and Last Interglacial[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(25)
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