. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 368 Chemical oceanography POC / CHLOROPHYLL a RATIO 0 200 400 600 800 2000 I—I—1 I r~i I \ r" I CHLOROPHYLL a (^g/| ) n M 1 f ? I C/N RATIO 0 4 8 12 16 P0N(^9N/l) SALINITY( °/..) 0 20 40 60 80 31 32 33 T I I I \ \. Figure 23-9. Vertical profiles of particulate organic carbon (—•—•—), and nitrogen (~o—o—), C/N (-D D ), chlorophyll a {-^ ^-), POC/chl. a {—^-—^—), temperature, and salinity at stations of the continental shelf area. definite boundaries for the d
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 368 Chemical oceanography POC / CHLOROPHYLL a RATIO 0 200 400 600 800 2000 I—I—1 I r~i I \ r" I CHLOROPHYLL a (^g/| ) n M 1 f ? I C/N RATIO 0 4 8 12 16 P0N(^9N/l) SALINITY( °/..) 0 20 40 60 80 31 32 33 T I I I \ \. Figure 23-9. Vertical profiles of particulate organic carbon (—•—•—), and nitrogen (~o—o—), C/N (-D D ), chlorophyll a {-^ ^-), POC/chl. a {—^-—^—), temperature, and salinity at stations of the continental shelf area. definite boundaries for the distribution of these materials were found to occur on the continental slope, St. Matthew Island, and Bering Strait areas. From these data, it can be seen that high productivity values due to phytoplankton occur in the area be- tween the continental slope and St. Matthew Island and in the Chukchi area. Low productivity would be predicted in the area extending from north of St. Matthew Island to the Bering Strait. No significant differences in the concentration of SiOa-Si, NOi"-N, NOg-N, NH^N, and PO|--P be- tween the areas were observed; thus the possibility that inorganic nutrient concentrations are the direct cause of regional variability in phytoplanktonic productivity is discounted. Vertical profiles of at, however, suggest that upward transport of inter- mediate waters rich in inorganic nutrients occurred along the continental slope toward station 30. Dis- tribution profiles of dissolved organic carbon (DOC) clearly show the occurrence of upwelling in the transition area between the continental slope and the continental shelf. From these data, it can be con- cluded that inorganic nutrients are being transported into the euphotic zone in the region of station 30, thus providing the high productivity observed. Poor phytoplanktonic productivity observed in the area between St. Matthew and St. Lawrence Islands is likely to be associated with the co
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