Sea Ice Kinematics: Space and Time Scales

Ice kinematics are described in terms of the 5 basic modes of motion: divergence (D), vorticity (zeta), deformation rate (T), and ice translation (U). Seasonal time histories of these ice kinematic parameters (IKP) were calculated using position data from drifting buoys in the arctic during May, Aug...

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Bibliographic Details
Main Authors: Lewis, James K, Giuffrida, Maria R, Denner, Warren W
Other Authors: SCIENCE APPLICATIONS INTERNATIONAL CORP COLLEGE STATION TX
Format: Text
Language:English
Published: 1988
Subjects:
Snow
Ice and Permafrost
*KINEMATICS
*SEA ICE
ARCTIC REGIONS
BUOYS
DEFORMATION
DRIFT
HISTORY
ICE
MOTION
NUMERICAL ANALYSIS
POSITION(LOCATION)
RATES
SCALE
SEASONAL VARIATIONS
SEASONS
SPATIAL DISTRIBUTION
STATISTICAL ANALYSIS
TIME
TIME SERIES ANALYSIS
TRANSLATIONS
VARIATIONS
VELOCITY
VORTICES
Arctic
Ice
permafrost
Sea ice
Online Access:http://www.dtic.mil/docs/citations/ADA191162
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA191162
Description
Summary:Ice kinematics are described in terms of the 5 basic modes of motion: divergence (D), vorticity (zeta), deformation rate (T), and ice translation (U). Seasonal time histories of these ice kinematic parameters (IKP) were calculated using position data from drifting buoys in the arctic during May, Aug, and Nov 1979. Results were used to determine seasonal space and time scales of D, zeta, T, and translation speed variations in the arctic. An e-folding scale is used as a measure of temporal coherency. Spatial variability is defined in terms of the degree of similarity between the magnitudes of a parameter at various locations. Results of seasonal space and time scale analyses indicate that divergence was the most temporally and spatially variable of the IKP for all seasons. Translation speed was the most consistent in space and time. Significant variations in divergence occurred in some areas on the order of 110 km and within approx. 2 hours. In contrast, significant variations in the translation speed occurred in some areas on the order of 705 km and over a period as great as 80 hours. This information is appropriate for setup of numerical simulations of ice motion. The Navy's Polar Ice Prediction System (PIPS) is the only operational system which can furnish predictive ice kinematic information throughout the arctic. To provide useful operational information, PIPS must be run at the appropriate space and time scales.

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