The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberings00hood Year: 1981 A more detailed study of this phenomenon was undertaken using enhanced TIROS imagery for March 16, 17, 18, and 19 (Fig. 10-12), so that individual floes could be tracked for a longer period of time. Muench and Ahlnas (1976) tracked floes during spring 1974 and found that their dominant direction of travel, in the area south of St. Lawrence Island, was to the south-southwest under predominantly northeast winds. Twelve floes A-G,
The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberings00hood Year: 1981 A more detailed study of this phenomenon was undertaken using enhanced TIROS imagery for March 16, 17, 18, and 19 (Fig. 10-12), so that individual floes could be tracked for a longer period of time. Muench and Ahlnas (1976) tracked floes during spring 1974 and found that their dominant direction of travel, in the area south of St. Lawrence Island, was to the south-southwest under predominantly northeast winds. Twelve floes A-G, J-N (Fig. 10-12), were tracked during the period 16-19 March for two days, and where possible for three days. Due to the resolution of the imagery, all floes appeared to be giant (>10 km across). Floes could not be tracked Remote sensing analysis of ice growth and distribution 151 longer than three days because they tended to break up into floes smaller than the resolution of the imagery. Table 10-1 lists these floes by letter, gives their approximate size, the direction of the wind from true north (Pease, this volume), the floe direc- tion, and the floe speed. Floes A-G were followed on 16-17 March. For B-F the wind direction was estimated at 220°-225° relative to true north. The floes traveled 235° to 245°. For A and G the winds were estimated to be at 205° and the floes traveled 180°. These floes are within an area where their movement is affected by the ice shear around St. Lawrence Island. For floes Figure 10-12. Floe trajectory map. 16-19 March 1979. The dominant wind regime was from the northeast during this period; floes tended to move to the south-southwest in response to the wind around the polynya area behind St. Lawrence Island.
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