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• W2157131198 abstract "Abstract Data on glacial erosion have been compiled and synthesised using a wide range of sediment budget and sediment yield studies from the Svalbard–Barents Sea region. The data include studies ranging in timescale from 1 to 106 yr, and in size of drainage basin from 101 to 105 km2. They show a clear dependence of sediment yield on the mode of glacierization. Polar glaciers erode at rates comparable to those found in Arctic fluvial basins, or about 40 t km-2 yr-1 or 0.02 mm yr-1. In contrast, rates of erosion by polythermal glaciers are 800–1000 t km-2 yr-1 (or ca 0.3–0.4 mm yr-1), while rates from fast-flowing glaciers are slightly more than twice this: 2100 t km-2 yr-1 (or 1 mm yr-1). Similar rates are also found for large glacierized basins like those in the southwestern parts of the Barents Sea. In contrast to the situation in fluvial basins, in which sediment yield typically decreases with increasing basin size, the tendency in glacierized basins is for erosion to be independent of basin size. In studies of sediment yield from glaciers it is sometimes difficult to distinguish between material actually dislodged from the bedrock by glaciers and material dislodged by other processes in interglacial times and simply transported to a depocenter by a glacier. Our data suggest that pulses of sediment resulting from advance of a glacier over previously-dislodged material last on the order of 103 yr, and result in inferred erosion rates that are approximately 25% higher than long-term average rates of glacial erosion. The maximum sediment fluxes from the large Storfjorden and Bear Island drainage basins occurred in mid-Pleistocene. The onset of this period of high sediment yield coincided with the onset of the 100 kyr glacial cycle. We presume that this was the beginning of a period of increased glacial activity, but one in which glaciers still advanced and retreated frequently. During the last two to four 100 kyr cycles, however, sediment yields appear to have decreased. This decrease may be the result of the submergence of the Barents Sea. Glacier erosion would be much higher for a subaerial Barents Sea setting than it would be for a present day subsea Barents Sea. A classical question in Quaternary Geology is whether glaciers are more erosive than rivers. We surmise that if factors such as the lithology and the available potential energy (mgh) of the precipitation falling at a given altitude, whether in liquid or solid form, are held constant, then glaciers are vastly more effective agents of erosion than rivers." @default.
• W2157131198 created "2016-06-24" @default.
• W2157131198 creator A5020220812 @default.
• W2157131198 creator A5044618001 @default.
• W2157131198 creator A5076610492 @default.
• W2157131198 date "1998-01-01" @default.
• W2157131198 modified "2023-09-25" @default.
• W2157131198 title "LATE CENOZOIC EROSION AND SEDIMENT YIELD FROM THE SVALBARD–BARENTS SEA REGION: IMPLICATIONS FOR UNDERSTANDING EROSION OF GLACIERIZED BASINS" @default.
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• W2157131198 doi "https://doi.org/10.1016/s0277-3791(97)00070-x" @default.
• W2157131198 hasPublicationYear "1998" @default.
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