. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . ,-' \â/ .1973-78 mean 197?-78 Apr May Jun Ju F .â >fx ililfcfe. â M i^^M iiiiiiil ,1973-78 nean â ^f r-^.f 'Y;I9?8~79' â ftl. (missing dat9^ r--^^ 1 â \ |.--^ \ Oct Nov Dec Jan Feb Mar Apr May Jun Jul Figure 9-2, a-f Percent ice cover as calculated from the area indicated in Fig. 9-1 for the eastern Bering Sea for the winters 1973-79. The shaded area is the six-year mean (seasonal cycle) while the solid line is the individual winter data (redrawn after Niebauer 1980). tunity in the ar
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . ,-' \â/ .1973-78 mean 197?-78 Apr May Jun Ju F .â >fx ililfcfe. â M i^^M iiiiiiil ,1973-78 nean â ^f r-^.f 'Y;I9?8~79' â ftl. (missing dat9^ r--^^ 1 â \ |.--^ \ Oct Nov Dec Jan Feb Mar Apr May Jun Jul Figure 9-2, a-f Percent ice cover as calculated from the area indicated in Fig. 9-1 for the eastern Bering Sea for the winters 1973-79. The shaded area is the six-year mean (seasonal cycle) while the solid line is the individual winter data (redrawn after Niebauer 1980). tunity in the area. Bottom temperatures were ob- tained from Coachman and Charnell (1979). North- ern Hemisphere 700 mb pressure chairts were ob- tained from Monthly Weather Review. Air temp- eratures and surface winds for the Pribilof Islands were taken from the Local Climatological Data published by the Department of Commerce. RESULTS Seasonal ice cycle Fig. 9-2 (a-f) illustrates the mean seasonal cycle of ice for the eastern Bering Sea. The ice generally begins its seasonal southward formation in November. It is estimated that about 97 percent of the ice in the Bering Sea (Leonov 1960) is formed within the Bering Sea. Very little ice is transported south through the Bering Strait (Tabata 1974). The ice apparently forms like a giant conveyor belt, being generated along the south-facing coasts in the Bering Sea and moving southward at as much as m/sec before finally melting at its southern limit (Pease, this volume). Therefore, although the ice on the Bering Sea shelf is subsequently pushed around by the wind on shorter time scales (see, for example, Muench and Ahlnas 1976), only about 3 percent of the seasonal sea ice cover is actually advected onto the shelf through the Bering Strait.
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