DOI: 10.5194/tc-7-823-2013
Scopus记录号: 2-s2.0-84883185780
论文题名: Satellite-derived volume loss rates and glacier speeds for the Cordillera Darwin Icefield, Chile
作者: Melkonian A ; K ; , Willis M ; J ; , Pritchard M ; E ; , Rivera A ; , Bown F ; , Bernstein S ; A
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 3 起始页码: 823
结束页码: 839
语种: 英语
英文关键词: digital elevation model
; estimation method
; glacial hydrology
; pixel
; regression analysis
; satellite imagery
; sea level change
; velocity profile
; Chile
; Cordillera Darwin
; Magallanes
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74961
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
Melkonian A,K,, Willis M,et al. Satellite-derived volume loss rates and glacier speeds for the Cordillera Darwin Icefield, Chile[J]. Cryosphere,2013-01-01,7(3)