气候变化领域集成服务门户(CCPortal): Surface speed and frontal ablation of Kronebreen and Kongsbreen, NW Svalbard, from SAR offset tracking

CCPortal

DOI	10.5194/tc-9-2339-2015
	Surface speed and frontal ablation of Kronebreen and Kongsbreen, NW Svalbard, from SAR offset tracking
	Schellenberger T.; Dunse T.; Kääb A.; Kohler J.; Reijmer C.H.
发表日期	2015
ISSN	19940416
卷号	9 期号:6
英文摘要	Kronebreen and Kongsbreen are among the fastest-flowing glaciers on Svalbard and, therefore, important contributors to the total dynamic mass loss from the archipelago. Here, we present a time series of area-wide surface velocity fields from April 2012 to December 2013 based on offset tracking on repeat high-resolution Radarsat-2 Ultrafine data. Surface speeds reached up to 3.2 m dg-1 near the calving front of Kronebreen in summer 2013 and 2.7 m dg-1 at Kongsbreen in late autumn 2012. Additional velocity fields from Radarsat-1, Radarsat-2 and TerraSAR-X data since December 2007 together with continuous GPS measurements on Kronebreen since September 2008 revealed complex patterns in seasonal and interannual speed evolution. Part of the ice-flow variations seem closely linked to the amount and timing of surface meltwater production and rainfall, both of which are known to have a strong influence on the basal water pressure and hence basal lubrication. In addition, terminus retreat and the associated reduction in back stress appear to have influenced the speed close to the calving front, especially at Kongsbreen in 2012 and 2013. Since 2007, Kongsbreen retreated up to 1800 m, corresponding to a total area loss of 2.5 km2. In 2011 the retreat of Kronebreen of up to 850 m, responsible for a total area loss of 2.8 km2, was triggered after a phase of stable terminus position since ∼ 1990. Retreat is an important component of the mass balance of both glaciers, in which frontal ablation is the largest component. Total frontal ablation between April 2012 and December 2013 was estimated to 0.21-0.25 Gt ag-1 for Kronebreen and 0.14-0.16 Gt ag-1 for Kongsbreen.
学科领域	ablation; glacier flow; ice flow; iceberg calving; RADARSAT; satellite data; synthetic aperture radar; time series analysis; Arctic; Kongsbreen; Kronebreen; Spitsbergen; Svalbard; Svalbard and Jan Mayen
语种	英语
scopus关键词	ablation; glacier flow; ice flow; iceberg calving; RADARSAT; satellite data; synthetic aperture radar; time series analysis; Arctic; Kongsbreen; Kronebreen; Spitsbergen; Svalbard; Svalbard and Jan Mayen
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/119770
作者单位	Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, Oslo, 0316, Norway; Norwegian Polar Institute, Fram Centre, Tromsø, Norway; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Princetonplein 5, Utrecht, 3584 CC, Netherlands
推荐引用方式 GB/T 7714	Schellenberger T.,Dunse T.,Kääb A.,et al. Surface speed and frontal ablation of Kronebreen and Kongsbreen, NW Svalbard, from SAR offset tracking[J],2015,9(6).
APA	Schellenberger T.,Dunse T.,Kääb A.,Kohler J.,&Reijmer C.H..(2015).Surface speed and frontal ablation of Kronebreen and Kongsbreen, NW Svalbard, from SAR offset tracking.Cryosphere,9(6).
MLA	Schellenberger T.,et al."Surface speed and frontal ablation of Kronebreen and Kongsbreen, NW Svalbard, from SAR offset tracking".Cryosphere 9.6(2015).