. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Nutrient distributions and dynamics 985 Station 59 16 60 61 Station 59 16 60. 40 80 Distance (km) 40 80 Distance (km) 120 Figure 58-10. Distribution of nitrate and ammonium (idg atoms N/1) in outer Bristol Bay south of the Pribilof Islands along a northern transect extending from 55°'N-168°'W to 56°'N-167°'W (Acona cruise 242, 13-28 May 1977). 8 1 1 1 1 1 7 _ Open symbol: Shelf Stat on . ( 6 h ⢠Closed symbol: + July Deep Stat 1971 on - 4<
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Nutrient distributions and dynamics 985 Station 59 16 60 61 Station 59 16 60. 40 80 Distance (km) 40 80 Distance (km) 120 Figure 58-10. Distribution of nitrate and ammonium (idg atoms N/1) in outer Bristol Bay south of the Pribilof Islands along a northern transect extending from 55°'N-168°'W to 56°'N-167°'W (Acona cruise 242, 13-28 May 1977). 8 1 1 1 1 1 7 _ Open symbol: Shelf Stat on . ( 6 h ⢠Closed symbol: + July Deep Stat 1971 on - 4< i D ⢠⢠⢠O July D July 1975 1978 - 3( 2l 5 1 1 1 J â â ⢠⢠1 ⢠+ ⢠â 1 ⢠â 1 ⢠1 10 NO,- 15 20 25 (ng at N/l) Figure 58-11. Relationship between nitrate concentrations in the surface layer and ammonium concentrations in the sub-surface layer in the Bering Sea and the northern North Pacific (after Saino et al. 1979). Data sources: Hattori 1973, 1977, 1979. +: July 1971; o: July 1975; d: July 1978. Open symbols refer to shelf stations and closed symbols deep stations. that the nitrite maximum, like ammonium in the outer-shelf domain and the deep Bering Sea, is near the bottom rather than near the top of the seasonal thermocline (Fig. 58-12). Ubiquitous occurrences in the open ocean of the subsurface nitrite maximum and its close association with chlorophyll maxima are known. However, concen- trations of nitrite in its maximum layer in the Bering Sea are several times higher than those observed in the tropical and subtropical North Pacific (Hattori 1973, 1975; Kiefer et al. 1976). Two sources of subsurface nitrite have been con- sidered: production of nitrite during nitrate reduc- tion by phytoplankton, and production during ammonium oxidation by nitrifying bacteria (Carlucci et al. 1970, Miyazaki et al. 1973, Kiefer et al. 1976). Experiments conducted using '^N-labeled nitrate and ammonium in the northwestern North Pacific suggest that t
Size: 2013px × 1241px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionamericana, bookdecade1980, bookspo
