. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 192 Ice distribution and dynamics Figs. 12-7a, 12-llb, and 12-14 show the most dra- matic examples of this patterned ice, which consists of rectangles measuring about 20 m in width and 40 m in length, with their long axes perpendicular to the direction of wave propagation. In cross section, this ice is about m thick; the thicker floes consist of two or three rafted pieces. This zone exists because the outer ice zone reduces the swell ampli- tude to the po
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 192 Ice distribution and dynamics Figs. 12-7a, 12-llb, and 12-14 show the most dra- matic examples of this patterned ice, which consists of rectangles measuring about 20 m in width and 40 m in length, with their long axes perpendicular to the direction of wave propagation. In cross section, this ice is about m thick; the thicker floes consist of two or three rafted pieces. This zone exists because the outer ice zone reduces the swell ampli- tude to the point that the waves fracture the ice without heavily rafting or ridging it. At the inside edge of the transition zone, we observed an abrupt transition from the patterned ice to large floes measuring kilometers in extent. This third interior zone is the region of large floes where the swell amplitude is reduced so much that it propa- gates elastically without fracturing the ice. Fig. 12-8a shows an aerial view of this ice, where the floes measure kilometers in extent and m in thick- ness. Satellite images suggest that this zone extends far to the north. In support of this general ice-edge picture, we next examine the specific properties along the three traverse lines. Line W The W-traverse took place on 6 March at the positions shown on Fig. 12-1. The wind on this day was negligible and the air temperature was about —5 C. Fig. 12-4 shows a schematic diagram of the kinds of ice observed on the traverse; the ice consisted of an edge zone 8 km wide and a transition zone 3 km wide with an abrupt transition from the rectangular floes to the interior zone at the northern edge of the transition zone. The outermost floe on this line is station Scott. We occupied this floe for a strain-gauge experiment in the morning of 6 March; we were also fortunate enough to have divers from the ship, namely Lt. Comdr. TumbuU, Lt. Williscroft, Lt. (jg.) Fox, and Mr. Kramer, survey the bottom
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