globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.03.005
Scopus记录号: 2-s2.0-85016613180
论文题名:
Rapid thinning of the Laurentide Ice Sheet in coastal Maine, USA, during late Heinrich Stadial 1
作者: Koester A.J.; Shakun J.D.; Bierman P.R.; Davis P.T.; Corbett L.B.; Braun D.; Zimmerman S.R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 163
起始页码: 180
结束页码: 192
语种: 英语
英文关键词: Exposure dating ; Marine-terminating ice sheet ; New England deglaciation
Scopus关键词: Glaciers ; Oceanography ; Atlantic meridional overturning circulations ; Cosmogenic exposure ; Deglaciations ; Exposure dating ; Ice sheet ; Last deglaciation ; Laurentide ice sheets ; Marine reservoir effects ; Ice
英文摘要: Few data are available to infer the thinning rate of the Laurentide Ice Sheet (LIS) through the last deglaciation, despite its importance for constraining past ice sheet response to climate warming. We measured 31 cosmogenic 10Be exposure ages in samples collected on coastal mountainsides in Acadia National Park and from the slightly inland Pineo Ridge moraine complex, a ∼100-km-long glaciomarine delta, to constrain the timing and rate of LIS thinning and subsequent retreat in coastal Maine. Samples collected along vertical transects in Acadia National Park have indistinguishable exposure ages over a 300 m range of elevation, suggesting that rapid, century-scale thinning occurred at 15.2 ± 0.7 ka, similar to the timing of abrupt thinning inferred from cosmogenic exposure ages at Mt. Katahdin in central Maine (Davis et al., 2015). This rapid ice sheet surface lowering, which likely occurred during the latter part of the cold Heinrich Stadial 1 event (19–14.6 ka), may have been due to enhanced ice-shelf melt and calving in the Gulf of Maine, perhaps related to regional oceanic warming associated with a weakened Atlantic Meridional Overturning Circulation at this time. The ice margin subsequently stabilized at the Pineo Ridge moraine complex until 14.5 ± 0.7 ka, near the onset of Bølling Interstadial warming. Our 10Be ages are substantially younger than marine radiocarbon constraints on LIS retreat in the coastal lowlands, suggesting that the deglacial marine reservoir effect in this area was ∼1,200 14C years, perhaps also related to the sluggish Atlantic Meridional Overturning Circulation during Heinrich Stadial 1. © 2017 Elsevier Ltd
资助项目: We acknowledge Acadia National Park's permission to sample, help from R. E. Nelson in the field, A. Denn in the lab, and G. Longsworth for the digital elevation model of Mount Desert Island. Research supported by National Science Foundation grant EAR-1603175 to Shakun, EAR-1602280 to Bierman, and Boston College startup funds. This is LLNL paper contribution #707927. We thank Mike Kaplan and Tom Lowell for their detailed, helpful reviews.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59256
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作者单位: Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA, United States; Department of Geology, University of Vermont, Burlington, VT, United States; Department of Natural and Applied Sciences, Bentley University, Waltham, MA, United States; Department of Environmental, Geographical, and Geological Sciences, Bloomsburg University, Bloomsburg, PA, United States; Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, United States

Recommended Citation:
Koester A.J.,Shakun J.D.,Bierman P.R.,et al. Rapid thinning of the Laurentide Ice Sheet in coastal Maine, USA, during late Heinrich Stadial 1[J]. Quaternary Science Reviews,2017-01-01,163
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