Abstract
Movement of pack ice off the Okhotsk Sea coast of Hokkaido was investigated using combinations of sea ice radar photographs and Landsat MSS imageries. The sea ice radar network, consisting of three C-band (5.54 GHz) radar stations, covers an area of about 60 km across and 250 km along the coast. As radar echoes display not the shape of ice floes but the roughness of the ice field, the shapes of floes were drawn on a radar photograph overlaid upon a simultaneous Landsat Fig. 1. The coverage of the sea ice radar network. imagery. Each floe was then traced on the sequential photographs of radar display. The path of each floe frequently indicated a trochoidal oscillation of 18-hour period which is close to the inertial period of this area-Such paths were examined as representing the motion of inertial circle transported upon a long-period movement. The parameter v/U indicates the magnitude of meandering movement of an ice floe within the inertial period, where v is the circumferential velocity of inertial circle motion and U is the average velocity of a main drift in the inertial period. Values of v/U were obtained in a wide range from 0.4 to 8.3 for 18-hour trochoidal paths sampled.
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