Geometric changes in a tidewater glacier in Svalbard during its surge cycle

Murray, T.; James, T.; Sykes, H.; Macheret, Y.; Lavrentiev, I.; Glazovsky, A.

Авторы: Murray T., James T., Sykes H., Macheret Y., Lavrentiev I., Glazovsky A.
Журнал: Arctic, Antarctic, and Alpine Research
Том: 44
Номер: 3
Год издания: 2012
Издательство: University of Colorado
Местоположение издательства: United States
Первая страница: 359
Последняя страница: 367
DOI: 10.1657/1938-4246-44.3.359
Аннотация: Fridtjovbreen, Svalbard, is a partially tidewater-terminating glacier that started a 7-year surge during the 1990s. Flow peaked during 1996 and no surge front was apparent. We use two pre-surge (1969 and 1990) and a post-surge (2005) digital elevation models (DEMs) together with a bed DEM to quantify volume changes and iceberg calving during the surge, calculate the changes in glacier hypsometry, and investigate the surge trigger. Between 1969 and 1990, the glacier lost 5% of its volume, retreated 530 m and thinned by up to 60 m in the lower elevations while thickening by up to 20 m in its higher elevations. During the surge, the reservoir zone thinned by up to 118 m and the receiving zone thickened by ∼140 m. Fridtjovbreen's ice divide moved ∼500 m, incorporating extra ice into its catchment. Despite this volume gain, during 1990–2005 the glacier lost ∼ 10% of its volume through iceberg calving and 7% through surface melt. The surge occurred in a climate of decreasing overall ice volume, so we need to revise the notion that surging is triggered by a return to an original geometry, and we suggest Fridtjovbreen's surge was triggered by increasing shear stresses primarily caused by increases in surface slope.
Добавил в систему: Глазовский Андрей Федорович

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Geometric changes in a tidewater glacier in Svalbard during its surge cycleстатья

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