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Abstract
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| Johnsons and Hurd are two temperate glaciers covering an area of about 10 km2 on Hurd Peninsula, Livingston Island, South Shetland Islands (SSI), Antarctica. In this paper, specific mass balance estimates from different sources are analysed and compared with those from other SSI locations and with the regional meteorological records. The mass balance data set comes from: a) 10 shallow (0.5-16 m) ice cores drilled in 1994-1995 to identify both the 137Cs layer from 1965 thermonuclear tests and the tephra layer from the 1970 eruption at Deception Island; b) 3 intermediate (22-35 m) cores drilled in Johnsons glacier in 1999-2000 searching for markers from earlier eruptions; c) measurements of a net of 17 stakes on Johnsons glacier during the campaigns 1994-1995 to 1999-2000; d) the comparison of digital elevation models constructed from 1956 aerial photographs and our geodetic measurements in 1999-2001; e) measurements from 2001 to present of a net of 50 stakes on Johnsons-Hurd glaciers. As a global estimate of the mass balance, the ice volume changes during 1956-2000 represent a 10% decrease from the 1956 volume and are equivalent to an average annual mass balance of -0.23 +/- 0.10 m in water equivalent during such period. | |
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International
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Si |
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Congress
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SCAR/IASC Open Science Conference |
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960 |
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Place
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San Petersburgo, Rusia |
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Reviewers
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Si |
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ISBN/ISSN
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978-5-98364-013-9 |
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Start Date
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08/07/2008 |
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End Date
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11/07/2008 |
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From page
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1418 |
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To page
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1418 |
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The mass balance of Johnsons-Hurd glaciers, Livingston Island, Antarctica |