气候变化领域集成服务门户(CCPortal): Seasonal dynamics of Totten Ice Shelf controlled by sea ice buttressing

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DOI	10.5194/tc-12-2869-2018
	Seasonal dynamics of Totten Ice Shelf controlled by sea ice buttressing
	Greene C.A.; Young D.A.; Gwyther D.E.; Galton-Fenzi B.K.; Blankenship D.D.
发表日期	2018
ISSN	19940416
卷号	12 期号:9
英文摘要	Previous studies of Totten Ice Shelf have employed surface velocity measurements to estimate its mass balance and understand its sensitivities to interannual changes in climate forcing. However, displacement measurements acquired over timescales of days to weeks may not accurately characterize long-term flow rates wherein ice velocity fluctuates with the seasons. Quantifying annual mass budgets or analyzing interannual changes in ice velocity requires knowing when and where observations of glacier velocity could be aliased by subannual variability. Here, we analyze 16 years of velocity data for Totten Ice Shelf, which we generate at subannual resolution by applying feature-tracking algorithms to several hundred satellite image pairs. We identify a seasonal cycle characterized by a spring to autumn speedup of more than 100myr-1 close to the ice front. The amplitude of the seasonal cycle diminishes with distance from the open ocean, suggesting the presence of a resistive back stress at the ice front that is strongest in winter. Springtime acceleration precedes summer surface melt and is not attributable to thinning from basal melt. We attribute the onset of ice shelf acceleration each spring to the loss of buttressing from the breakup of seasonal landfast sea ice. © 2016 Society of Cosmetic Chemists. All rights reserved.
学科领域	autumn; glacier; ice shelf; mass balance; satellite imagery; sea ice; seasonal variation
语种	英语
scopus关键词	autumn; glacier; ice shelf; mass balance; satellite imagery; sea ice; seasonal variation
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/119074
作者单位	Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; Australian Antarctic Division, Kingston, TAS 7050, Australia; Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, TAS 7001, Australia
推荐引用方式 GB/T 7714	Greene C.A.,Young D.A.,Gwyther D.E.,et al. Seasonal dynamics of Totten Ice Shelf controlled by sea ice buttressing[J],2018,12(9).
APA	Greene C.A.,Young D.A.,Gwyther D.E.,Galton-Fenzi B.K.,&Blankenship D.D..(2018).Seasonal dynamics of Totten Ice Shelf controlled by sea ice buttressing.Cryosphere,12(9).
MLA	Greene C.A.,et al."Seasonal dynamics of Totten Ice Shelf controlled by sea ice buttressing".Cryosphere 12.9(2018).