DOI: 10.1016/j.epsl.2017.11.038
Scopus记录号: 2-s2.0-85035069038
论文题名: Asynchronous behavior of the Antarctic Ice Sheet and local glaciers during and since Termination 1, Salmon Valley, Antarctica
作者: Jackson M.S. ; Hall B.L. ; Denton G.H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 396
结束页码: 406
语种: 英语
英文关键词: Antarctic Ice Sheet
; glacial geomorphology
; ice sheet stability
; Termination I
Scopus关键词: Geomorphology
; Glacial geology
; Glaciers
; Landforms
; Sea ice
; Sea level
; Antarctic ice sheets
; Asynchronous behavior
; Glacial geomorphology
; Ice sheet
; Increasing temperatures
; Meltwater pulse
; Radiocarbon dates
; Rapid drawdowns
; Ice
; geomorphological mapping
; geomorphological response
; glacier dynamics
; glacier flow
; Holocene
; ice sheet
; radiocarbon dating
; sea ice
; Antarctic Ice Sheet
; Antarctica
; East Antarctica
; McMurdo Sound
; Ross Sea
; Southern Ocean
英文摘要: The stability of the Antarctic Ice Sheet under future warming remains an open question with broad implications for sea-level prediction and adaptation. In particular, knowledge of whether the ice sheet has the capacity for rapid drawdown or collapse, or whether it can remain stable during periods of warming, is essential for predicting its future behavior. Here we use 55 radiocarbon dates, coupled with geomorphologic mapping, to reconstruct the timing of changes in ice extent and elevation during the last ice-age termination in Salmon Valley, adjacent to McMurdo Sound in the western Ross Sea Embayment. Results indicate that a grounded ice sheet in the Ross Sea Embayment achieved its maximum elevation and extent along the headlands of Salmon Valley at ∼18,000 yr BP, during a period of increasing temperatures and accumulation over the Antarctic continent. This ice remained at or near its maximum on the headlands near the valley mouth until after ∼14,000 yr BP. Removal of grounded Ross Sea ice from Salmon Valley was complete shortly after ∼7900 yr BP, indicating that the grounding line had retreated through southern McMurdo Sound by that time. We suggest the primary driver of Ross Sea ice removal from McMurdo Sound was marine-based, either through basal melting or calving due to sea-level rise. When combined with regional data, the Salmon Valley record suggests that this sector of the Antarctic Ice Sheet did not contribute in a significant way to deglacial meltwater pulses, such as meltwater pulse 1a. In contrast to the Ross Sea ice, our work also shows that local, independent alpine glaciers in Salmon Valley have advanced through the Holocene. Land-terminating glaciers such as these elsewhere in the region show a similar pattern, and may reflect the continued influence of increased accumulation following the termination of the last ice age. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110095
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: School of Earth and Climate Sciences, The Climate Change Institute, University of Maine, Orono, ME 04469, United States
Recommended Citation:
Jackson M.S.,Hall B.L.,Denton G.H.. Asynchronous behavior of the Antarctic Ice Sheet and local glaciers during and since Termination 1, Salmon Valley, Antarctica[J]. Earth and Planetary Science Letters,2018-01-01,482