DOI: 10.5194/tc-11-1501-2017
Scopus记录号: 2-s2.0-85022182587
论文题名: Winter mass balance of Drangajökull ice cap (NW Iceland) derived from satellite sub-meter stereo images
作者: Belart J ; M ; C ; , Berthier E ; , Magnússon E ; , Anderson L ; S ; , Pálsson F ; , Thorsteinsson T ; , Howat I ; M ; , Aoalgeirsdóttir G ; , Jóhannesson T ; , Jarosch A ; H
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 3 起始页码: 1501
结束页码: 1517
语种: 英语
英文关键词: accuracy assessment
; digital elevation model
; glacier dynamics
; ground control
; ground-based measurement
; ice cap
; image resolution
; mass balance
; satellite imagery
; snow accumulation
; stereo image
; winter
; Drangajokull
; Iceland
英文摘要: Sub-meter resolution, stereoscopic satellite images allow for the generation of accurate and high-resolution digital elevation models (DEMs) over glaciers and ice caps. Here, repeated stereo images of Drangajökull ice cap (NW Iceland) from Pléiades and WorldView2 (WV2) are combined with in situ estimates of snow density and densification of firn and fresh snow to provide the first estimates of the glacier-wide geodetic winter mass balance obtained from satellite imagery. Statistics in snow- and ice-free areas reveal similar vertical relative accuracy ( <0.5 m) with and without ground control points (GCPs), demonstrating the capability for measuring seasonal snow accumulation. The calculated winter (14 October 2014 to 22 May 2015) mass balance of Drangajökull was 3.33±0.23mw.e. (meter water equivalent), with 60% of the accumulation occurring by February, which is in good agreement with nearby ground observations. On average, the repeated DEMs yield 22% less elevation change than the length of eight winter snow cores due to (1) the time difference between in situ and satellite observations, (2) firn densification and (3) elevation changes due to ice dynamics. The contributions of these three factors were of similar magnitude. This study demonstrates that seasonal geodetic mass balance can, in many areas, be estimated from sub-meter resolution satellite stereo images. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75537
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: Institute of Earth Sciences, University of Iceland, Askja, Reykjavík, Iceland; Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, Centre National de la Recherche Scientifique (LEGOS-CNRS), Université de Toulouse, Toulouse, France; Icelandic Meteorological Office, Reykjavík, Iceland; School of Earth Sciences and Byrd Polar and Climate Research Center, Ohio State University, Columbus, United States
Recommended Citation:
Belart J,M,C,et al. Winter mass balance of Drangajökull ice cap (NW Iceland) derived from satellite sub-meter stereo images[J]. Cryosphere,2017-01-01,11(3)