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 Shelf environment 461 MONTHLY MEAN YUKON RIVER RUNOFF AT RUBY o o o o c 3 cr 10 12 5 6 7 Month Figure 29-5. Monthly mean Yukon River runoff (m^ /sec) at Ruby 1975-78 and long-term (22-year) mean. northern Anadyr Bay and north of St. Lawrence Island (Fig. 29-6) are beheved to be local results of the freezing process inasmuch as they are separated by large areas of lower salinity. Values lower than ^/00 occupy the majority of
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 Shelf environment 461 MONTHLY MEAN YUKON RIVER RUNOFF AT RUBY o o o o c 3 cr 10 12 5 6 7 Month Figure 29-5. Monthly mean Yukon River runoff (m^ /sec) at Ruby 1975-78 and long-term (22-year) mean. northern Anadyr Bay and north of St. Lawrence Island (Fig. 29-6) are beheved to be local results of the freezing process inasmuch as they are separated by large areas of lower salinity. Values lower than ^/00 occupy the majority of the shelf area south of St. Lawrence Island and out to about the 100 m isobath. By May several changes are evident. A decrease of l-2°/oo is evident in inner Bristol Bay, in Norton Sound, and north of St. Lawrence Island, and a long tongue of values less than °/oo extends eastward from the Yukon River mouth to just south of St. Lawrence Island. By July ice is no longer present and the river runoff has resulted in a pro- nounced dilution of surface water along the west coast of Alaska and in Anadyr Bay; a minimum value of less than °/oo occurs in Norton Sound. Despite this marked dilution inshore and lesser changes offshore (evident in the westerly displace- ment of the isohaline—nearly 200 km), the °/oo isohaline appears to be in a consistent position roughly paralleling the 100-m isobath along an approximate line from Unimak Island to Cape Navarin. By September the effect of further dilution seaward of the shelf is evident as very little water of greater than °/oo remains over the basin, but conditions in the shelf area are similar to those of July except for slightly higher salinities near the Yukon River mouth and in Norton Sound, probably the result of mixing and decreased runoff. Mean bottom salinities below 50 m generally increase with depth. In January-March values of bottom and surface salinity are largely the same in water less than 50
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