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Descripción
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| We present the results of several radio-echo sounding surveys carried out on Johnsons and Hurd Glaciers, Livingston Island, Antarctica, between the 1999/2000 and 2004/05 austral summer campaigns, which included both radar profiling and common-midpoint measurements with low (20-25 MHz)- and high (200 MHz)-frequency radars. The latter have allowed us to estimate the radio-wave velocity in ice and firn and the corresponding water contents in temperate ice, which vary between 0 and 1.6% depending on the zone. Maximum ice thickness is ~200 m, with a mean value of 93.6 ± 2.5 m. Total ice volume is 0.968 ± 0.026 km3, for an area of 10.34 ± 0.03 km2. The subglacial relief of Johnsons Glacier is quite smooth, while that of Hurd Glacier shows numerous overdeepenings and peaks. The radar records suggest that Hurd Glacier has a polythermal structure, contrary to the usual assumption that glaciers in Livingston Island are temperate. This is also supported by other dynamical and geomorphological evidence. | |
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Internacional
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JCR del ISI
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Si |
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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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0,802 |
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Información de impacto
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Volumen
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50 |
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DOI
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10.3189/172756409789097603 |
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Número de revista
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51 |
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Desde la página
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17 |
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Hasta la página
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24 |
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Mes
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AGOSTO |
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Ranking
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