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Ice-shelf collapse, climate change, and habitat loss in the Canadian high Arctic

  • W. F. Vincent (a1), J.A.E. Gibson (a2) and M.O. Jeffries (a3)
Abstract
Abstract

Early explorers in the Canadian high Arctic described a fringe of thick, landfast ice along the 500-km northern coast of Ellesmere Island. This article shows from analyses of historical records, aerial photographs, and satellite imagery (ERS-1, SPOT, RADARSAT-1) that this ancient ice feature (‘Ellesmere Ice Shelf’) underwent a 90% reduction in area during the course of the twentieth century. In addition, hydrographic profiles in Disraeli Fiord (83°N, 74°W) suggest that the ice-shelf remnant that presently dams the fiord (Ward Hunt Ice Shelf) decreased in thickness by 13 m (27%) from 1967 to 1999. Mean annual air temperatures at nearby Alert station showed a significant warming trend during the last two decades of this period, and a significant decline in the number of freezing degree days per annum. The ice-dammed fiord provides a stratified physical and biological environment (epishelf lake) of a type that is otherwise restricted to Antarctica. Extensive meltwater lakes occur on the surface of the ice shelf and support a unique microbial food web. The major contraction of these ice–water habitats foreshadows a much broader loss of marine cryo-ecosystems that will accompany future wanning in the high Arctic.

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W.M. Sackinger , M.O. Jeffries , M.C. Lu , and F.C. Li . 1988. Arctic ice islands. Fairbanks: Geophysical Institute, University of Alaska, Fairbanks (US Dept of Energy final report AC21–83MC20037).

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Polar Record
  • ISSN: 0032-2474
  • EISSN: 1475-3057
  • URL: /core/journals/polar-record
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