Investigations on physical and textural properties of Arctic first-year sea ice in the Amundsen Gulf, Canada, November 2007–June 2008 (IPY-CFL system study)
[en] We report sea-ice temperature and bulk salinity measurements as well as textural analysis
from 33 first-year drift- and fast-ice stations sampled between November 2007 and June 2008 in the
southern Beaufort Sea–Amundsen Gulf, Canadian Arctic, during the International Polar Year
Circumpolar Flaw Lead (IPY-CFL) system study. We use this significant dataset to investigate the halothermodynamic evolution of sea ice from growth to melt. A strong desalination phase is observed over a
small time window in the spring. Using calculated proxies of sea-ice permeability (brine volume
fraction) and of the intensity of brine convection (Rayleigh number) we demonstrate that this phase
corresponds to full-depth gravity drainage initiated by a restored connectivity of the brine network with
warming in the spring. Most stations had a textural sequence typical of Arctic first-year ice, with
granular ice overlying columnar ice. Unusual textural features were observed sporadically: sandwiched
granular ice, platelet ice and draped platelet ice. We suggest that turbulence in leads and double
diffusion in strong brine plumes following the refreeze of cracks are plausible mechanisms for the
formation of these textures.
Investigations on physical and textural properties of Arctic first-year sea ice in the Amundsen Gulf, Canada, November 2007–June 2008 (IPY-CFL system study)
Publication date :
2013
Journal title :
Journal of Glaciology
ISSN :
0022-1430
eISSN :
1727-5652
Publisher :
International Glaciological Society, Cambridge, United Kingdom
Volume :
59
Issue :
217
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FRFC - Fonds de la Recherche Fondamentale Collective
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