to a maximum of 2,5. microgram atoms at Station 49, about SO^miles from 

 the Siberian coast at the southern entrance to Bering Strait. ' Silicates 

 at this station were 35 mcg.at. per kilo as contrasted to' values of from 

 to 10 meg, at, for the entire central portion of the area. In Norton 

 Sound from Nunivak Island to Noim , silicate concentrations were higher, 

 abOTe 20 meg, at,, duo to the soluble silicate carried down by the Tukon 

 and Kuskolcwin rivers. Nitrites wero entirely absent or present in concen** 

 trations.of loss than 0,05 meg, at, per kilo in the eastern and central area 

 of North Bering Sea, Tho highest values above 0,20 meg. at. were found 

 along tho Siberian coast. Unusually high concentration of nutrient salts 

 and low concentrations of dissolved oxygen in the surfaoo layers at stations 

 49 and 50 arc e?q)lainod on tho basis of turbulence in that region as brought 

 out in tho discussion of temperature and chlorinity values. In South -Bering 

 Sea high concentrations of phosphate, ^silicate, and nitrite were found 

 along or just north of the Aleutian Ridge. This may be explained by up- 

 welling and mixing due to turbulence of the Pacific water as it passes across 

 the Ridge into the Bering,, 



The horizontal distribution of nutrient salts at subsurface levdLs 

 was lelatively the same as at the surface, but the actual concentrations 

 were higher at the lower levels. Throughout Bering Sea the contours showing 

 the distribution of nutrient sclt's and dissolved oxygon, as was the case 



vath tho Isotherms and. isochlor£ 



3nded to follow tho bottom contours and 



lie in the direction of the currents. 



In order to show the vertical distribution in South Bering Sea, values 

 of dissolved oxygen and nutrient salts for seven deep water stations (102, 

 105, 106, 107, 118, 119, and 120) have been averaged. Those average values 

 are given in Table VII, The concentration of dissolved oxygen 



TABLE VII. 



Average concentrations for dissolved oxygen and nutrient salts 

 for seven stations in Boring Sea near Bogoslof Island, (Concen- 

 trations of dissolved oxygon arc expressed as milligraia-at oms 

 and of nutrient salts as micrograiTL-atoms of the characteristic 

 element per kilo of soa water.) 



Nitrite: 



Depth 



Motors 







10 



25 



50 



75 



100 



150 



200 



300 



400 



500 



600 



800 



1000 



Dissolved Oxygon 



mg.at. 



0.521 

 .531 

 .513 

 ,459 

 ,445 

 ,433 

 .404 

 ,598 

 .323 

 >205 

 ,133 

 .096 

 .061 

 ,057 



% Sat, 



90.4 

 91,2 

 86,0 

 73,7 

 71.0 

 68,8 

 63,7 

 62,0 

 50,3 

 32,3 

 20.7 

 14,9 

 9,4 

 8.8 



Phosphorus 



ncg.at. 



1.3 

 1.5 

 1.7 

 1.9 

 2.0 

 2,0 

 2,0 

 2,3 

 2,5 

 2.6 

 2,8 

 2.8 

 2,9 

 2,9 



Silicon 



meg. at. 



29 



31 



38 



49 



54 



58 



64 



69 



32 



91' 



105 



115 



130 



135 



NitroRon; pH 



l.iCg.St. 



0.14 

 .13 

 .16 

 .20 

 .13 

 .12 

 ,09 

 .05 

 .02 

 ,00 

 ,00 

 .00 

 .00 

 ,00 



8.09 



8.09 



8.08 



8.06 



8,05 



8.04 



7,99 



7,94 



7,90 



7,86- 



7.81 



7.81 



7.78 



7.74 



average slightly more at 10 meters than at the surface. Below 10 meters 



- 21 * 



