. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Nutrient distributions and dynamics 979 40 30 3- 20 o cd 10 - JULY 1975 ⢠Deep Bering Sea A Outer-Shelf Domain â Mid-Shelf Domain. 40 30 - ctf O) 4 (0 20 10 1 2 Phosphate (^g at/I) 0 1 1 JULY 1978 ⢠/ - ⢠Deep Bering Sea â¢â¢/ / A Outer-Shelf Domain y â Mid-Shelf Domain A Z / - a/« /A / A / A /a /â â a/ #â > / 1 1 - 1 2 3 Phosphate (jig at/I) Figure 58-4. Relationship between piiosphate and nitrate in 0- to 150-m water columns of the eastern Bering Sea in
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Nutrient distributions and dynamics 979 40 30 3- 20 o cd 10 - JULY 1975 ⢠Deep Bering Sea A Outer-Shelf Domain â Mid-Shelf Domain. 40 30 - ctf O) 4 (0 20 10 1 2 Phosphate (^g at/I) 0 1 1 JULY 1978 ⢠/ - ⢠Deep Bering Sea â¢â¢/ / A Outer-Shelf Domain y â Mid-Shelf Domain A Z / - a/« /A / A / A /a /â â a/ #â > / 1 1 - 1 2 3 Phosphate (jig at/I) Figure 58-4. Relationship between piiosphate and nitrate in 0- to 150-m water columns of the eastern Bering Sea in sum- mer. â¢: deep Bering Sea; A: outer-shelf domain; â : mid-shelf domain. Left: July 1975 (Hakuho Maru KH-75-4 cruise, Hattori 1977); right: July 1978 (Hakuho Maru KH-78-3 cruise, Hattori 1979). excess phosphate ranged from to (average ± ) in July 1975 and from to (average ± ) in July 1978 (Table 58-2). Marked deviations occur in nitrate-N/phosphate-P of mid-shelf domain bottom water. The ratio cor- rected for excess phosphate averaged ± during the summer of 1975 and ± during the summer of 1978 (Table 58-2). These low values may result from differences in regeneration rates of phosphate and nitrate. Detrital organic matter and living phytoplankton are transported from the euphotic layer to the bottom layer by settling. Inorganic phosphate is regenerated simply through hydrolysis of organic phosphates. However, the decomposition of organic nitrogenous compounds yields ammonium, which must be further oxidized by nitrifying bacteria to nitrite and then to nitrate. The latter process is relatively slow, especially at cold temperatures. Therefore, since the ammonium which results from the decomposition of organic matter is oxidized only at a slow rate, it accumulates in these waters. In fact, unusually high concentrations of ammonium ( to ng at/1) were observed in the bottom water of the mid
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