Three-dimensional glacial flow and surface elevation measured with radar interferometry

Article Abstract:

Outlet glaciers appear to be dynamically less stable in North Greenland compared to South Greenland. The Storstrommen outlet glacier in northeastern Greenland has been well studied, following its surge between 1978 and 1984. Glacier surge mechanisms and their geographical distribution are not well known, but satellite radar interferometry can offer large-scale topography models with high resolution. An interferometry method is presented, combining observations from ascending and descending satellite orbits, and its accuracy is proved through good agreement with in situ Global Positioning System reference data.

Usage, Interferometry

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Ice-volcano interaction of the 1996 Gjalp subglacial eruption, Vatnajokull, Iceland

Article Abstract:

The process of heat transfer between ice and magma, the response of a surrounding glacier and edifice formation is not well understood due to lack of data. Observations from a fissure eruption at Vatnajokull ice cap in Iceland in 1996 are presented. The erupted magma formed a hyaloclastite ridge, and meltwater flowed into the Grimsvotn subglacial lake for five weeks. The glacier surfacer stayed intact, indicating that widespread basal sliding in warm-based glaciers is not triggered by subglacial eruptions.

Observations, Volcanoes, Glacial erosion

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Hydrological characteristics of the drainage system beneath a surging glacier

Article Abstract:

Subglacial drainage systems are inaccessible and their surges are infrequent, and normal field observations only provide limited support for certain models. The major discharge of water from an ice-dammed lake which drains along the glacier bed, can offer the chance to test current hypotheses, as outburst floods during glacial surges can be compared with those occurring during normal periods.

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