The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberings00hood Year: 1981 226 Ice distribution and dynamics Figure 14-5. Composite NOAA-4 visible satellite image of the Bering Sea for 17 March 1976. broadening of the head of the band. It is also clear, on the original negative at least, that there are no waves behind the heads c, d, and e. Dunbar and Weeks (1975) call these plumes 'tadpoles' and show that pancake ice forms in the heads. They also suggest that an oceanic Langmuir circulation leads to the formation of the grease
The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberings00hood Year: 1981 226 Ice distribution and dynamics Figure 14-5. Composite NOAA-4 visible satellite image of the Bering Sea for 17 March 1976. broadening of the head of the band. It is also clear, on the original negative at least, that there are no waves behind the heads c, d, and e. Dunbar and Weeks (1975) call these plumes 'tadpoles' and show that pancake ice forms in the heads. They also suggest that an oceanic Langmuir circulation leads to the formation of the grease-ice plumes. Fig. 14-8 shows an oblique photograph from 150 m of a polynya 3 km wide south of Nome on 5 March 1978. The air temperature was —20 C, the wind speed was 15 m/sec from 010°, and the predominant wavelength was 6 m. The photograph clearly shows the organization of the grease ice into plumes parallel to the wind, and the pile-up of grease ice downwind against the floes. The arrow on the photograph marks the location of a detritus line, which we will discuss later. The field and laboratory work of Martin and Kauffman (1980) shows that the grease ice is a slurry of small ice platelets which individually measure approximately 1 mm in diameter and 1-10 ^im in thickness. Fig. 14-9 shows a photograph taken through crossed polaroids of the clusters of ice platelets; the clusters which formed in our laboratory grease ice measure 1-5 mm across. Our observa- tions show that the concentration of such crystals
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