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|Title:||The measurement of ice velocity, mass balance and thinning-rate on Johnsons Glacier, Livingston Island, South Shetland Islands, Antarctica|
|Author:||Ximenis i Llussà, Laia|
Calvet i Porta, Jaume
Corbera Simon, Jordi
Fernández de Gamboa, C.
Furdada i Bellavista, Glòria
Livingston (Shetland del Sud : Illa)
Livingston Island (South Shetland Islands)
|Publisher:||Universitat de Barcelona (UB). Institut de Cièncias de la Terra Jaume Almera (ICTJA)|
|Abstract:||A network of twenty stakes was set up on Johnsons Glacier in order to determine its dynamics. During the austral summers from 1994-95 to 1997-98, we estimated surface velocities, mass balances and ice thickness variations. Horizontal velocity increased dow nstream from 1 m a- 1 near the ice divides to 40 m a- 1 near the ice terminus. The accumulation zone showed low accumulation rates (maximum of 0,6 m a- 1 (ice)), whereas in the lower part of the glacier, ablation rates were 4,3 m a- 1 (ice). Over the 3-year study period, both in the accumulation and ablation zones, we detected a reduction in the ice surface level ranging from 2 to 10 m from the annual ve rt ical velocities and ice-thinning data, the mass balance was obtained and compared with the mass balance field values, resulting in similar estimates. Flux values were calculated using cross-section data and horizontal velocities, and compared with the results obtained by means of mass balance and ice thinning data using the continuity equation. The two methods gave similar results.|
|Note:||Reproducció del document publicat a: http://www.raco.cat/index.php/ActaGeologica/article/view/75661|
|It is part of:||Acta Geologica Hispanica, 1999, vol. 34, num. 4, p. 403-410|
|Appears in Collections:||Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)|
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