In:
Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 96, No. C3 ( 1991-03-15), p. 4709-4721
Abstract:
The aerodynamic roughness for all major types of sea ice is specified on the basis of surface layer measurements from ship and ice floe platforms. Median neutral surface drag coefficients, C dn ×1000, for grease and nilas ice are 0.7 and 1.6. Small, medium, large, and fused pancake ice have C dn equal to 0.9, 1.6, 2.4, and 1.9. Young ice C dn ranges from 2.3 to 3.1. Very smooth first‐year or multiyear ice with no pressure ridges has C dn equal to 1.5. Pack ice has median values of 2.0 and 2.2 for first‐year and multiyear ice. Marginal ice zone ice averages 3.1 and 3.4 (first‐year, multiyear) if unaffected by wave action. Wave‐affected ice has C dn values of 4.2 and 4.6 (first‐year, multiyear). Extremely rough multiyear ice in intense shear or compaction regions has C dn equal to 8.0. Open ocean areas within 100 km of an ice edge averaged 1.8, while ice‐free water downwind of ice, with small or no waves is 1.4. These values can be adjusted if heat fluxes are present. The accuracy of the C dn averages is estimated to be 20% or better.
Type of Medium:
Online Resource
ISSN:
0148-0227
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1991
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