The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberingsea00hood Year: 1981 MID-SHELF - COASTAL <30m Salinity o Salinityo Figure 58-1. Temperature-salinity and nutrient-salinity envelopes in the eastern Bering Sea in July 1978 (Hakuho Maru H-78-3 cruise, Hattori 1979). Individual envelopes enclose all station data in 0- to 150-m w^ater columns (0 to the bottom where the bottom is less than 150 m) at indicated stations: deep Bering Sea, Stations 6,
The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberingsea00hood Year: 1981 MID-SHELF - COASTAL <30m Salinity o Salinityo Figure 58-1. Temperature-salinity and nutrient-salinity envelopes in the eastern Bering Sea in July 1978 (Hakuho Maru H-78-3 cruise, Hattori 1979). Individual envelopes enclose all station data in 0- to 150-m w^ater columns (0 to the bottom where the bottom is less than 150 m) at indicated stations: deep Bering Sea, Stations 6, 8, 31, 33, 34; outer-shelf domain, Stations 10, 11, 30; mid-shelf domain, 13, 28; coastal domain. Stations 14, 16. Dashed lines refer to T-S and nutrient-S diagrams at Station 9 (1,650 m) seaward of Zhemchug canyon. for horizontal eddy diffusivities are similar within each oceanic front, but an order of magnitude greater between fronts; the fronts evidently inhibit lateral fluxes of water and dissolved materials. The nu- trient zonation shown in Fig. 58-1 is consistent wdth this physical regime. In surface layers of the mid-shelf domain shallower than 20 m, late spring and early summer concentra- tions of nutrients are commonly low ( jUg at/1 of phosphate, of nitrate, and 4-49 of silicic acid), and increase sharply with depth, re- flecting the nutrient consumption associated with rapid phytoplankton growrth. The bottom layer of the mid-shelf domain is cold and rich in nutrients, and probably represents a remnant of the winter ocean. Data from the mid-shelf domain in winter (McRoy and Goering 1974) show almost uniform vertical distributions of temperature, salinity, and nutrients, not unlike those found in the bottom layer in summer. In the coastal domain summer nutrient concentrations are also low ( iig at/1 of phos- phate, of nitrate, and 2-24 of silicic acid), but do not show any significant vertical trend because the water is mixed from the surface
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