Authors: Jania, J.; Macheret, Y.u.Y.a.; Navarro, F.J.; Glazovsky, A.F.; Vasilenko, E.V.; Lapazaran, J.; Glowacki, P.; Migala, K.; Balut, A.; Piwowar, B.A.

Source: Annals of Glaciology, Volume 42, Number 1, August 2005 , pp. 125-134(10)

Publisher: International Glaciological Society

Abstract:

In order to study the seasonal and inter-seasonal variations in radio-wave velocity (RWV), radiophysical investigations were made at Hansbreen, a polythermal glacier in Spitsbergen, in July-August 2003 and April 2004. These investigations included repeated radar profiling (20 and 25 MHz) along a transverse profile, repeated common-midpoint measurements, continuous radar measurements during 8 days at a fixed site, meteorological observations, and continuous ice surface velocity monitoring by differential GPS. Seasonal and inter-seasonal RWV changes in the temperate ice layer are attributed, respectively, to rapid water redistribution within it during the summer, and to variations in water content from 2.1% in summer to 0.4% in spring. The reflection properties of the temperate ice layer correlate well with the air temperature, with a nearly semi-diurnal time lag. The temporal variability of the reflection properties of the internal horizon suggests enlargement of water inclusions or water drainage from the horizon. Repeated profiling shows a stable spatial pattern in bed reflection power interpreted as changes in water content controlled by bedrock topography. The spatial variations of internal reflection energy along the repeated profile correlate with the thickness of the cold ice layer and the occurrence of drainage and crevasse systems.

Document Type: Research article

DOI: http://dx.doi.org/10.3189/172756405781812754

Publication date: 2005-08-01

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• The Annals of Glaciology is a peer-reviewed, thematic journal published 2 to 4 times a year by the International Glaciological Society (IGS). Publication frequency is determined and volume/issue numbers assigned by the IGS Council on a year-to-year basis and with a lead time of 3 to 4 years. The Annals of Glaciology is included in the ISI Science Citation Index from volume 50, number 50 onwards.

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• By this author: Jania, J. ;  Macheret, Y.u.Y.a. ;  Navarro, F.J. ;  Glazovsky, A.F. ;  Vasilenko, E.V. ;  Lapazaran, J. ;  Glowacki, P. ;  Migala, K. ;  Balut, A. ;  Piwowar, B.A.

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