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Descripción
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| Johnsons and Hurd are the two main glacier units of Hurd Peninsula ice cap, in Livingston Island, South Shetland Islands, Antarctica. They presently cover an area about 10 km2. Johnsons is a tidewater glacier, while Hurd glacier ends on emerged land. In this paper we estimate the changes in ice volume during the period 1956-2000, and compare them with the regional meteorological records. The volume change estimates are based on the comparison of digital terrain models for the glacier surface, constructed from aerial photographs taken by the British Antarctic Survey in 1956, and from our geodetic measurements in 1999-2000. The total volume estimates are based on an ice thickness map constructed from radio-echo sounding profiles (18-25 MHz) done in 1999-2001, showing maximum ice thickness about 200 m. We estimate the changes in ice volume during the period 1956-2000 to be ca. 0.108+/-0.048 km3, which represents a 10.0+/-4.5% decrease from the 1956 total volume of 1.076+/-0.055 km3 and is equivalent to an average annual mass balance of -0.23+/-0.10 m in water equivalent (w.e.) during 1956-2000. Ice thickness changes range from -40 m to +20 m, averaging ca. 5.5+/-4.4 m. Most areas show ice thinning; the thickening is limited to a small area within Johnsons glacier. All glacier fronts, except Johnsons¿ calving front, show retreat. These changes are consistent with the regional meteorological records for mean summer temperature, which show a trend of +0.023+/-0.005 ºC/yr during the period 1956-2000. | |
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Internacional
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Si |
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JCR del ISI
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No |
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Título de la revista
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Annals of Glaciology |
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ISSN
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0260-3055 |
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Factor de impacto JCR
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0 |
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Información de impacto
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Volumen
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46 |
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DOI
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Número de revista
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0 |
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