. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . R Q C/N RATIO 200 400 600 800 1000 25 POC/CHL a RATIO 28 Figure 23-4. Vertical profiles of particulate organic carbon and nitrogen, C/N, chlorophyll a, POC/chl. a, NH4-N, tem- perature, salinity, and sigma-t at station 4. curvature of the salinity profile from the surface to 500 m. These observations are in agreement with the observed temperature profile in this area. The distribution profile of particulate organic carbon along 57° N in the deep Bering Sea is shown in Fig. 23-6 (see Fig.
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . R Q C/N RATIO 200 400 600 800 1000 25 POC/CHL a RATIO 28 Figure 23-4. Vertical profiles of particulate organic carbon and nitrogen, C/N, chlorophyll a, POC/chl. a, NH4-N, tem- perature, salinity, and sigma-t at station 4. curvature of the salinity profile from the surface to 500 m. These observations are in agreement with the observed temperature profile in this area. The distribution profile of particulate organic carbon along 57° N in the deep Bering Sea is shown in Fig. 23-6 (see Fig. 23-1 for locations). The concen- tration of particulate organic carbon rEinged from 80 to 240 //gC/1 in the euphotic layer (0-50 m depth) (Otabe et al. 1977). The values tended to decrease rapidly with depth below the euphotic zone at all stations except those on the continental shelf. The vertical distribution of particulate organic carbon in the intermediate water is rather complicated in this oceEinic area. High concentrations of particulate organic carbon were measured in the intermediate cold waters at stations 7, 8, and 10, while low con- centrations of particulate organic carbon were found in the intermediate warm waters centered at station 9. The distribution profile of particulate organic nitrogen in the deep Bering Sea is shown in Fig. 23-7. More than 20 MgN/1 of particulate organic nitrogen was found in the euphotic layers at stations 7, 8, 12, 14, and 15. More than 10 was found at stations 9,10, and 11. All these values tended to decrease to one-half at depths of 75-100 m. High values of par- ticulate organic nitrogen were found in the cold waters of the intermediary depths at stations 7 and 8 as observed in the distribution profile of particulate organic carbon. These data indicate that low tem- perature retards the rate of decay of the particulate organic carbon materials by biological agents, result- ing in high concentrations of particulate organic carbon in t
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