DOI: 10.1016/j.quascirev.2012.10.024
Scopus记录号: 2-s2.0-84870184304
论文题名: Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments
作者: Axford Y. ; Losee S. ; Briner J.P. ; Francis D.R. ; Langdon P.G. ; Walker I.R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 59 起始页码: 87
结束页码: 100
语种: 英语
英文关键词: Chironomidae
; Greenland
; Holocene thermal maximum
; Jakobshavn
; Lake sediments
; Neoglaciation
; Paleoclimate
Scopus关键词: Chironomidae
; Greenland
; Jakobshavn
; Lake sediments
; Neoglaciation
; Paleoclimates
; Thermal maxima
; Digital storage
; Glaciers
; Incident solar radiation
; Lakes
; Sedimentology
; Sediments
; Climate change
; climate variation
; fossil record
; Holocene
; insect
; lacustrine deposit
; paleoclimate
; paleotemperature
; reconstruction
; subfossil
; data assimilation
; ice sheet
; sedimentary sequence
; temperature profile
; Arctic
; Greenland
; Greenland Ice Sheet
; Jakobshavn Isbrae
; Chironomidae
; Hexapoda
英文摘要: Predicting the response of the Greenland Ice Sheet to future climate change presents a major challenge to climate science. Paleoclimate data from Greenland can provide empirical constraints on past cryospheric responses to climate change, complementing insights from contemporary observations and from modeling. Here we examine sedimentary records from five lakes near Jakobshavn Isbræ in central West Greenland to investigate the timing and magnitude of major Holocene climate changes, for comparison with glacial geologic reconstructions from the region. A primary objective of this study is to constrain the timing and magnitude of maximum warmth during the early to middle Holocene positive anomaly in summer insolation. Temperature reconstructions from subfossil insect (chironomid) assemblages suggest that summer temperatures were warmer than present by at least 7.1 ka (the beginning of the North Lake record; ka = thousands of years before present), and that the warmest millennia of the Holocene occurred in the study area between 6 and 4 ka. Previous studies in the Jakobshavn region have found that the local Greenland Ice Sheet margin was most retracted behind its present position between 6 and 5 ka, and here we use chironomids to estimate that local summer temperatures were 2-3 °C warmer than present during that time of minimum ice sheet extent. As summer insolation declined through the late Holocene, summer temperatures cooled and the local ice sheet margin expanded. Gradual, insolation-driven millennial-scale temperature trends in the study area were punctuated by several abrupt climate changes, including a major transient event recorded in all five lakes between 4.3 and 3.2 ka, which overlaps in timing with abrupt climate changes previously documented around the North Atlantic region and farther afield at ∼4.2 ka. © 2012. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60753
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, United States; Department of Geology, University at Buffalo, 411 Cooke Hall, Buffalo, NY 14260, United States; Department of Geosciences, University of Massachusetts, Morrill Science Center, 611 North Pleasant Street, Amherst, MA 01003, United States; Geography and Environment, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom; Palaeoecology Laboratory, University of British Columbia, Okanagan Campus, Kelowna, BC V1V1V7, Canada
Recommended Citation:
Axford Y.,Losee S.,Briner J.P.,et al. Holocene temperature history at the western Greenland Ice Sheet margin reconstructed from lake sediments[J]. Quaternary Science Reviews,2013-01-01,59