Glacier Recession on Heard Island, Southern Indian Ocean
| Autor: | Douglas E. Thost, Martin Truffer |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Hydrology
Global and Planetary Change geography geography.geographical_feature_category Ice stream Tidewater glacier cycle Climate change Glacier Glacier morphology Glacier mass balance Trend surface analysis Physical geography Digital elevation model Ecology Evolution Behavior and Systematics Geology Earth-Surface Processes |
| Zdroj: | Arctic, Antarctic, and Alpine Research. 40:199-214 |
| ISSN: | 1938-4246 1523-0430 |
| Popis: | Glacier retreat has been widespread on Heard Island, an isolated 2745-m-high volcano in the southern Indian Ocean, since the first observations in 1947. This study represents the first quantification of the mass loss of a Heard Island glacier. Brown Glacier is 4.8 km long and is land terminating. A digital elevation model for the glacier was developed using a combination of static and kinematic differentially corrected GPS surveys and hand-held GPS elevations, and together with ground penetrating radar, was used to estimate the glacier's catchment area boundary. The 1947 extent of the glacier was estimated from an aerial photograph. The total ice covered area has decreased from an estimated 6.18 × 106 m2 in 1947 to 4.38 × 106 m2 in 2004. This corresponds to a loss of ∼29% of the original area. During the same period the ice volume decreased by an estimated 1.743 × 108 m3 (∼3.06 × 106 m3 a−1), equating to an average thickness change of −0.50 m a−1. The mass loss is consistent with limited temperat... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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