气候变化领域集成服务门户(CCPortal): Satellite-derived volume loss rates and glacier speeds for the Cordillera Darwin Icefield, Chile

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DOI	10.5194/tc-7-823-2013
	Satellite-derived volume loss rates and glacier speeds for the Cordillera Darwin Icefield, Chile
	Melkonian A.K.; Willis M.J.; Pritchard M.E.; Rivera A.; Bown F.; Bernstein S.A.
发表日期	2013
ISSN	19940416
卷号	7 期号:3
英文摘要	We produce the first icefield-wide volume change rate and glacier velocity estimates for the Cordillera Darwin Icefield (CDI), a 2605 km2 temperate icefield in southern Chile (69.6°W, 54.6° S). Velocities are measured from optical and radar imagery between 2001-2011. Thirty-six digital elevation models (DEMs) from ASTER and the SRTM DEM are stacked and a weighted linear regression is applied to elevations on a pixel-by-pixel basis to estimate volume change rates. The CDI lost mass at an average rate of -3.9±1.5 Gt yr-1 between 2000 and 2011, equivalent to a sea level rise (SLR) of 0.01±0.004mmyr-1 and an area-averaged thinning rate of -1.5±0.6mw.e.(water equivalent) yr-1. Thinning is widespread, with concentrations near the front of two northern glaciers (Marinelli, Darwin) and one western (CDI-08) glacier. Thickening is apparent in the south, most notably over the advancing Garibaldi Glacier. The northeastern part of the CDI has an average thinning rate of -1.9±0.7mw.e. yr-1, while the southwestern part has an average thinning rate of -1.0±0.4mw.e. yr -1. Velocities are obtained over many of the CDI glaciers for the first time. We provide a repeat speed time series at the Marinelli Glacier. There we measure maximum front speeds of 7.5±0.2mday-1 in 2001, 9.5±0.6mday-1 in 2003 and 10±0.3mday-1 in 2011. The maintenance of high front speeds from 2001 to 2011 supports the hypothesis that Marinelli is in the retreat phase of the tidewater cycle, withdynamic thinning governed by the fjord bathymetry. © Author(s) 2013.
学科领域	digital elevation model; estimation method; glacial hydrology; pixel; regression analysis; satellite imagery; sea level change; velocity profile; Chile; Cordillera Darwin; Magallanes
语种	英语
scopus关键词	digital elevation model; estimation method; glacial hydrology; pixel; regression analysis; satellite imagery; sea level change; velocity profile; Chile; Cordillera Darwin; Magallanes
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/120270
作者单位	Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States; Centro de Estudios Científicos (CECs), Valdivia, Chile; Departamento de Geografía, Universidad de Chile, Santiago, Chile; St. Timothy's School, 8400 Greenspring Ave, Stevenson, MD 21153, United States
推荐引用方式 GB/T 7714	Melkonian A.K.,Willis M.J.,Pritchard M.E.,et al. Satellite-derived volume loss rates and glacier speeds for the Cordillera Darwin Icefield, Chile[J],2013,7(3).
APA	Melkonian A.K.,Willis M.J.,Pritchard M.E.,Rivera A.,Bown F.,&Bernstein S.A..(2013).Satellite-derived volume loss rates and glacier speeds for the Cordillera Darwin Icefield, Chile.Cryosphere,7(3).
MLA	Melkonian A.K.,et al."Satellite-derived volume loss rates and glacier speeds for the Cordillera Darwin Icefield, Chile".Cryosphere 7.3(2013).