Acceleration in thinning rate on western Svalbard glaciers

Geodetic measurements indicate that a number of glaciers in western Svalbard ranging in size from 5–1000 km2 are losing mass at an accelerating rate. The average thinning rate for Midtre Lovénbreen, the glacier with the best data coverage, has increased steadily since 1936. Thinning rates for 2003–2005 are more than 4 times the average for the first measurement period 1936–1962 and are significantly greater than presented previously. On Slakbreen, thinning rates for the latest measurement period 1990–2003 are more than 4 times that of the period 1961–1977. Thinning of several glaciers along a previously measured airborne lidar profile in Wedel Jarls Land has also increased, doubling between the period 1990–1996 and 1996–2002. Our results imply an increased sea level contribution from Svalbard. In addition, the mass loss is an important influence on measured rates of rebound on western Svalbard and should be factored into analysis of GRACE results.

[1]  R. Armstrong,et al.  The Physics of Glaciers , 1981 .

[2]  J. L. Sollid,et al.  Mass balance and changes of surface slope, crevasse and flow pattern of Erikbreen, northern Spitsbergen: an application of a geographical information system (GIS) , 1993 .

[3]  Jon Ove Hagen,et al.  Glacier atlas of Svalbard and Jan Mayen , 1993 .

[4]  P. Holmlund,et al.  The Mass Balance of Circum-Arctic Glaciers and Recent Climate Change , 1997, Quaternary Research.

[5]  W. Oechel,et al.  Observational Evidence of Recent Change in the Northern High-Latitude Environment , 2000 .

[6]  Tavi Murray,et al.  Controls on the distribution of surge-type glaciers in Svalbard , 2000, Journal of Glaciology.

[7]  W. Krabill,et al.  Greenland Ice Sheet: High-Elevation Balance and Peripheral Thinning. , 2000, Science.

[8]  J. Gregory,et al.  Changes in sea‐level , 2002 .

[9]  M. Wild,et al.  Modelling the response of glaciers to climate change by applying volume-area scaling in combination with a high resolution GCM , 2001 .

[10]  A. Arendt,et al.  Rapid Wastage of Alaska Glaciers and Their Contribution to Rising Sea Level , 2002, Science.

[11]  Jon Ove Hagen,et al.  Glaciers in Svalbard: mass balance, runoff and freshwater flux , 2003 .

[12]  I. Hanssen‐Bauer,et al.  Past and future climate variations in the Norwegian Arctic: overview and novel analyses , 2003 .

[13]  J. Hagen,et al.  On the Net Mass Balance of the Glaciers and Ice Caps in Svalbard, Norwegian Arctic , 2003 .

[14]  James K. Yungel,et al.  Elevation changes of ice caps in the Canadian Arctic Archipelago , 2004 .

[15]  W. Krabill,et al.  Anomalous recent growth of part of a large Arctic ice cap: Austfonna, Svalbard , 2004 .

[16]  W. Krabill,et al.  Elevation changes measured on Svalbard glaciers and ice caps from airborne laser data , 2005, Annals of Glaciology.

[17]  W. Collins,et al.  Amplification of Surface Temperature Trends and Variability in the Tropical Atmosphere , 2005, Science.

[18]  Florence Fetterer,et al.  Tracking the Arctic's shrinking ice cover: Another extreme September minimum in 2004 , 2005 .

[19]  C. Symon,et al.  Arctic climate impact assessment , 2005 .

[20]  Ron Lindsay,et al.  The thinning of Arctic sea ice, 1988-2003 : Have we passed a tipping point? , 2005 .

[21]  W. Krabill,et al.  Progressive increase in ice loss from Greenland , 2006 .

[22]  Tavi Murray,et al.  Rapid and synchronous ice‐dynamic changes in East Greenland , 2006 .

[23]  E. Rignot,et al.  Changes in the Velocity Structure of the Greenland Ice Sheet , 2006, Science.

[24]  B. D. Tapley,et al.  Satellite Gravity Measurements Confirm Accelerated Melting of Greenland Ice Sheet , 2006, Science.

[25]  Hans-Peter Plag,et al.  A geophysical interpretation of the secular displacement and gravity rates observed at Ny-Ålesund, Svalbard in the Arctic—effects of post-glacial rebound and present-day ice melting , 2006 .

[26]  N. Barrand,et al.  Extracting photogrammetric ground control from lidar DEMs for change detection , 2006 .

[27]  Josefino C. Comiso,et al.  Arctic warming signals from satellite observations , 2006 .

[28]  A. Ohmura,et al.  Mass balance of glaciers and ice caps: Consensus estimates for 1961–2004 , 2006 .

[29]  Glacier geometry and elevation changes in Svalbard, 1936-1990 , 2006 .

[30]  Jon Ove Hagen,et al.  Glacier geometry and elevation changes on Svalbard (1936–90): a baseline dataset , 2007, Annals of Glaciology.