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 J I I I 1^^ I SILICATE (mo at/I) 8 12 16 20 24 28 -i 1 1 1 r Before storm _ J I I I I ii_:_± PHOSPHATE (;ig at/I) 0 / ' \ ' 1 1 10 — < / — 20 — ♦ ^~~S^ Before storm _ 30 - x^^— After storm <. . 40 - A n ^ 50 W W ^066 —• 2075 1 1 1 1 1 Figure 58-13. Vertical profiles of nitrate, silicic acid and phosphate before (o) and after (•) a storm for 13-16 May 1979 (PROBES Thomas G. Thompson cruise 138, 79 leg
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 J I I I 1^^ I SILICATE (mo at/I) 8 12 16 20 24 28 -i 1 1 1 r Before storm _ J I I I I ii_:_± PHOSPHATE (;ig at/I) 0 / ' \ ' 1 1 10 — < / — 20 — ♦ ^~~S^ Before storm _ 30 - x^^— After storm <. . 40 - A n ^ 50 W W ^066 —• 2075 1 1 1 1 1 Figure 58-13. Vertical profiles of nitrate, silicic acid and phosphate before (o) and after (•) a storm for 13-16 May 1979 (PROBES Thomas G. Thompson cruise 138, 79 leg 2). face phytoplankton is, therefore, estimated to be ~60 ng atoms N/l/h. This value falls in the range of reported nitrate uptake rates by natural popula- tions of phytoplankton in outer Bristol Bay (J. J. Goering, unpublished). SUMMARY: FUTURE RESEARCH The distribution of nutrients over extended areas of the eastern Bering Sea distinguishes four water masses: the deep Bering Sea water, the outer-shelf water, the mid-shelf water, and the coastal water. This zonation of nutrient distributions is closely related to the presence of three oceanic fronts de- fined by temperature-salinity data and is consistent with existing descriptions of the physical oceano- graphic regime. Current PROBES investigations are concentrated in outer Bristol Bay south of the Pribilof Islands, because this area is biologicadly productive and is the site of extensive commercial fishing and proposed oil exploration. Data presented in this chapter and data from the PROBES program provide a general description of nutrient cycling in the four different water types found in the southeast Bering shelf. Different patterns of nutrient cycling in the various shelf domains appear to result from zonal differences in food webs. Nutrient data summarized in this chapter also suggest that the productive region of the southeast Bering Sea shelf extends northwestward along the bathymetry at least to Zh
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