Mass balance and dynamics of a valley glacier measured by high-resolution LiDAR

ABSTRACT The changing surface geometry of the glacier Midre Lovénbreen on Svalbard was investigated using LiDAR data acquired on 9 August 2003 and again on 5 July 2005. The data were processed to generate Digital Elevation Models (DEMs) of unprecedentedly high spatial resolution (2 m) and accuracy (better than 0.15 m). Comparison of the two DEMs allowed the mass balance of the glacier to be determined as more negative than −0.62 m yr−1 water equivalent, about twice as negative as the value estimated from in situ measurements. Comparison of the DEMs also showed that the area of the glacier decreased by around 0.3%, and the position of its margin retreated by around 14 m, from 2003 to 2005. It was also possible to track the motion of fine-scale features in the surface geometry such as meltwater channels, and hence to determine the glacier's surface velocity, in some areas. Typical average speeds were around 1–2 cm per day.

[1]  J. G. Ferrigno,et al.  Antarctic glacier-tongue velocities from Landsat images: first results , 1993, Annals of Glaciology.

[2]  M. Meier,et al.  Mass balance of mountain and subpolar glaciers: a new global assessment , 1997 .

[3]  M. Pelto,et al.  Mass Balance Measurements on the Lemon Creek Glacier, Juneau Icefield, Alaska 1953–1998 , 1999 .

[4]  L. Andreassen,et al.  Using aerial photography to study glacier changes in Norway , 2002, Annals of Glaciology.

[5]  Kirill Khvorostovsky,et al.  Recent Ice-Sheet Growth in the Interior of Greenland , 2005, Science.

[6]  Duncan J. Wingham,et al.  Changes in Sea Level , 2001 .

[7]  Alun Hubbard,et al.  Glacier mass-balance determination by remote sensing and high-resolution modelling , 2000, Journal of Glaciology.

[8]  Bernard Lefauconnier,et al.  Glacier balance trends in the Kongsfjorden area, western Spitsbergen, Svalbard, in relation to the climate , 1999 .

[9]  Julian A. Dowdeswell,et al.  A surge of Perseibreen, Svalbard, examined using aerial photography and ASTER high resolution satellite imagery , 2003 .

[10]  J. Hagen,et al.  Runoff and drainage pattern derived from digital elevation models, Finsterwalderbreen, Svalbard , 2000, Annals of Glaciology.

[11]  B. Devereux,et al.  Evaluating the potential of high‐resolution airborne LiDAR data in glaciology , 2006 .

[12]  P. Kanagaratnam,et al.  Accelerated Sea-Level Rise from West Antarctica , 2004, Science.

[13]  Flow regime of the Lambert Glacier-Amery Ice Shelf system, Antarctica: structural evidence from Landsat imagery , 1994 .

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

[15]  Edward Hanna,et al.  Snowfall-Driven Growth in East Antarctic Ice Sheet Mitigates Recent Sea-Level Rise , 2005, Science.

[16]  R. Bindschadler,et al.  Application of image cross-correlation to the measurement of glacier velocity using satellite image data , 1992 .

[17]  Robert N. Swift,et al.  Accuracy of airborne laser altimetry over the Greenland ice sheet , 1995 .

[18]  W. Krabill,et al.  Calculation of Ice Velocities in the Jakobshavn Isbrae Area Using Airborne Laser Altimetry , 1999 .

[19]  J. Moore,et al.  Changes in geometry and subglacial drainage of Midre Lovénbreen, Svalbard, determined from digital elevation models , 2003 .

[20]  Determination of Changes in Volume and Elevation of Glaciers using Digital Elevation Models for the Vernagtferner, Ôtztal Alps, Austria , 1986 .

[21]  Jack Kohler,et al.  Topographic controls on the surface energy balance of a high Arctic valley glacier , 2006 .

[22]  E. Baltsavias,et al.  Digital Surface Modelling by Airborne Laser Scanning and Digital Photogrammetry for Glacier Monitoring , 2001 .