气候变化领域集成服务门户(CCPortal): Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica

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DOI	10.5194/tc-14-1-2020
	Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica
	Winsor K.; Swanger K.M.; Babcock E.; Valletta R.D.; L. Dickson J.
发表日期	2020
ISSN	19940416
起始页码	1
结束页码	16
卷号	14 期号:1
英文摘要	The geomorphic record indicates that alpine glaciers in the McMurdo Dry Valleys of southern Victoria Land, Antarctica, appear to advance during interglacial periods in response to ice-free conditions in the Ross Sea. Few records of these advances are preserved and/or subaerially exposed, complicating the interpretations of regional glacier response to climate changes. Here, we present geophysical and geochemical analyses of a rock glacier that originates from icefalls fed by alpine Doran Glacier in central Taylor Valley. The rock glacier exhibits a trend of increased weathering of granitic clasts via ventifaction and grussification down-flow. Meltwater ponds on the rock glacier exhibit variable salinity that ranges from freshwater to higher than seawater, with the highest salinity pond near the rock glacier toe. Ground-penetrating radar analyses reveal the feature to possess a primarily clean ice interior, with layers of englacial debris. Stable isotopic data from three ice cores support a glacial origin for the ice within the rock glacier. These data suggest that the current morphology of the rock glacier is the result of multiple events of increased ice contribution caused by advances of Doran Glacier, which is the main source of ice to the rock glacier. We therefore demonstrate the potential of ice-cored rock glaciers to record multiple advances and retreats of Dry Valley glaciers, permitting the interpretation of glacial responses to Pleistocene and Holocene climate change even where direct records are not present. © 2020 American Society of Civil Engineers (ASCE). All rights reserved.
英文关键词	climate change; freshwater input; glacier advance; Pleistocene-Holocene boundary; radar altimetry; rock glacier; salinity; seawater; valley glacier; weathering; Antarctica; East Antarctica; McMurdo Dry Valleys; Ross Sea; Southern Ocean; Taylor Valley; Victoria Land
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202249
作者单位	Department of Environmental, Earth and Atmospheric Sciences, University of Massachusetts Lowell, Lowell, MA 01854, United States; Logic Geophysics and Analytics LLC, Anchorage, AK 99508, United States; Department of Earth and Environmental Sciences, University of Pennsylvania, Philadelphia, PA 19104, United States; Department of Earth Environmental and Planetary Sciences, Brown University, Providence, RI 02912, United States; School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ 86005, United States; Franklin Institute, Philadelphia, PA 19103, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States
推荐引用方式 GB/T 7714	Winsor K.,Swanger K.M.,Babcock E.,et al. Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica[J],2020,14(1).
APA	Winsor K.,Swanger K.M.,Babcock E.,Valletta R.D.,&L. Dickson J..(2020).Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica.Cryosphere,14(1).
MLA	Winsor K.,et al."Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica".Cryosphere 14.1(2020).