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| Titel |
Variable glacier response to atmospheric warming, northern Antarctic Peninsula, 1988–2009 |
| VerfasserIn |
B. J. Davies, J. L. Carrivick, N. F. Glasser, M. J. Hambrey, J. L. Smellie |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 6, no. 5 ; Nr. 6, no. 5 (2012-09-21), S.1031-1048 |
| Datensatznummer |
250003785
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| Publikation (Nr.) |
 copernicus.org/tc-6-1031-2012.pdf |
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| Zusammenfassung |
| The northern Antarctic Peninsula has recently exhibited ice-shelf
disintegration, glacier recession and acceleration. However, the dynamic
response of land-terminating, ice-shelf tributary and tidewater glaciers has
not yet been quantified or assessed for variability, and there are sparse
data for glacier classification, morphology, area, length or altitude. This
paper firstly classifies the area, length, altitude, slope, aspect,
geomorphology, type and hypsometry of 194 glaciers on Trinity Peninsula, Vega
Island and James Ross Island in 2009 AD. Secondly, this paper documents
glacier change 1988–2009. In 2009, the glacierised area was 8140±262 km2.
From 1988–2001, 90% of glaciers receded, and from 2001–2009,
79% receded. This equates to an area change of −4.4% for Trinity Peninsula
eastern coast glaciers, −0.6% for western coast glaciers, and −35.0% for
ice-shelf tributary glaciers from 1988–2001. Tidewater glaciers on the drier,
cooler eastern Trinity Peninsula experienced fastest shrinkage from
1988–2001, with limited frontal change after 2001. Glaciers on the western
Trinity Peninsula shrank less than those on the east. Land-terminating
glaciers on James Ross Island shrank fastest in the period 1988–2001. This
east-west difference is largely a result of orographic temperature and
precipitation gradients across the Antarctic Peninsula, with warming
temperatures affecting the precipitation-starved glaciers on the eastern
coast more than on the western coast. Reduced shrinkage on the western
Peninsula may be a result of higher snowfall, perhaps in conjunction with the
fact that these glaciers are mostly grounded. Rates of area loss on the
eastern side of Trinity Peninsula are slowing, which we attribute to the
floating ice tongues receding into the fjords and reaching a new dynamic
equilibrium. The rapid shrinkage of tidewater glaciers on James Ross Island
is likely to continue because of their low elevations and flat profiles. In
contrast, the higher and steeper tidewater glaciers on the eastern Antarctic
Peninsula will attain more stable frontal positions after low-lying ablation
areas are removed, reaching equilibrium more quickly. |
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