Seasonal Decay of First-year Sea Ice: Field Measurements.

  1. (PDF, 684 KB)
DOIResolve DOI:
AuthorSearch for: ; Search for:
TypeTechnical Report
AbstractThis report describes the field program undertaken from 21 May to 19 July 2000 to measure the parameters that best characterize the ice decay process. During the field program, thickness of the first-year sea ice decreased from 1.55 m to 0.80 m, at which point the ice was virtually isothermal. The ice freeboard decreased from 60 mm in late May to a negative freeboard (melt ponding) in late July. Desalination was first observed in the surface layer of ice and eventually occurred in the bulk layer of ice, as indicated by the bulk salinity of 5 � in late May and 0.5 � in late July. More than one hundred borehole jack tests were conducted over the sampling period at depths 0.3, 0.6, 0.9 and 1.2 m. The average decrease in ice strength for the four depths was 8.7 MPa over the sampling period, most of which occurred between 4 June and 1 July. The surface layer of ice showed the largest decrease in strength over the sampling period (14.1 MPa to 2.1 MPa). Ice at a depth of 0.90 m had the least amount of change in strength (10.5 MPa to 3.7 MPa). In late July the bulk strength of the ice was only about 27% of what it was in late May.
Publication date
AffiliationNational Research Council Canada; NRC Canadian Hydraulics Centre
Peer reviewedNo
NRC numberHYD-TR-057
NPARC number12340899
Export citationExport as RIS
Report a correctionReport a correction
Record identifierbb6f1319-ea75-4d06-9367-043874217e90
Record created2009-09-11
Record modified2016-10-03
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)