DOI: 10.1016/j.quascirev.2014.06.001
Scopus记录号: 2-s2.0-84904731656
论文题名: Evidence for the asynchronous retreat of large outlet glaciers in southeast Greenland at the end of the last glaciation
作者: Dyke L.M. ; Hughes A.L.C. ; Murray T. ; Hiemstra J.F. ; Andresen C.S. ; Rodés T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 99 起始页码: 244
结束页码: 259
语种: 英语
英文关键词: Fjord deglaciation
; Greenland Ice Sheet
; Southeast Greenland
Scopus关键词: Glaciers
; Age determination
; Continental shelves
; Deglaciations
; Greenland Ice Sheet
; Irminger currents
; Long term records
; Southeast Greenland
; Glacial geology
; beryllium isotope
; climate effect
; dating method
; deglaciation
; fjord
; glacier retreat
; ice retreat
; ice sheet
; last glaciation
; oceanic current
; Younger Dryas
; Arctic
; Greenland
; Greenland Ice Sheet
; Kangerlussuaq Fjord
英文摘要: Recent rapid changes in the marine-terminating sectors of the Greenland Ice Sheet (GrIS) have prompted concerns about the future stability of the ice sheet. Long-term records of ice sheet behaviour provide valuable context to assess the magnitude of current change and may help resolve the mechanisms driving deglaciation. We report 23 new 10Be exposure ages which constrain the deglacial history of two large fjord systems in southeast (SE) Greenland. We compare our chronologies with existing data from the centre of the sector to examine the timing and style of deglaciation at a regional-scale. Glacial erratic 10Be exposure ages demonstrate that Kangerdlugssuaq Fjord deglaciated at ~11.8ka at the end of the Younger Dryas (YD - 12.8-11.6ka). Retreat at Kangerdlugssuaq Fjord coincided with known incursion of the warm Irminger Current (IC) onto the continental shelf; this is inferred to have initiated retreat. Comparison with recently published results from Sermilik Fjord and new 10Be ages from Bernstorffs Fjord indicates deglaciation occurred ~1ka later in the south of the SE region. Sermilik Fjord (~10.9ka) and Bernstorffs Fjord (~10.4ka) deglaciated later; retreat likely occurred in response to dramatic climatic amelioration at the termination of the YD stadial. We suggest that the disparate timing of deglaciation across the SE region may be primarily explained by the varying influence of the warm IC; glaciers in southern SE Greenland were isolated from warm Atlantic waters during the YD by complex shelf bathymetry. In all fjord settings ice retreat was rapid and persistent, consistent with the absence of geomorphological evidence for stillstand or readvance events. Ice retreat was accompanied by rapid thinning and likely continued to well within present-day ice sheet margins. Glacial erratic 10Be age determinations and geomorphological observations show no evidence for Holocene readvance events prior to the Little Ice Age (LIA). © 2014 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60188
Appears in Collections: 过去全球变化的重建
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作者单位: Glaciology Group, Swansea University, Singleton Park, Swansea SA2 8PP, United Kingdom; Department of Earth Science, University of Bergen and Bjerknes Centre for Climate Research, Allégaten 41, N-5007 Bergen, Norway; Geological Survey of Denmark and Greenland, Department of Marine Geology and Glaciology, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark; NERC-CIAF, Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, United Kingdom
Recommended Citation:
Dyke L.M.,Hughes A.L.C.,Murray T.,et al. Evidence for the asynchronous retreat of large outlet glaciers in southeast Greenland at the end of the last glaciation[J]. Quaternary Science Reviews,2014-01-01,99