the concentration decreased to tho lo¥/est observGd values at 1000 imtcrs, 

 A rainii.ram oxygen zone was found at 800 netors at Station 105 and indicated 

 at 1000 motors at other stations but was. not definitely established ?.s no 

 saiplcs were obtained below that depth. The values for dis^^olved oxygen at 

 1000 meters in this region were slightly higher than those- found at the 

 same depth in 1933 near Adak Island, 400 miles to the west (Thompson, Thomas 

 and Barnes, 1934), The vertical distribution curves for the two localities, 

 however, arc of tho same general ty^ic. 



The most significant change in phosphate concentration was the rapid 

 increase in the first 500 meters; bclo?f that depth, 'mluos either increased 

 onlj* slightly to maxima, at 1000 meters or were constant. The concentration 

 to a depth of 400 meters was considerably higher than that reported for 

 the Pacific off the V/ashington coast in 1932 (1936). Below 400 nEters, 

 the values obtained from the two regions were almost indentical. Silicate 

 concentrations also increased rapidly with depth in the upper levels. Little 

 change occur3©dfrom 800 to 1000 motors. Silicate concentrations for surface •■. 

 layers were higher than, those normally found in the Pacific near the Wash- 

 ington coast. A maximum for nitrite nitrogen of 0.20 meg. at. per kilo was ., 

 found at 50 meters. Concentrations were higher in the vicinity of the ... ^ - 

 islands than, at offshore stations. No nitrites were present at dep^ths of 

 over 300 meters. Values of pH decreased from about 8,1 at the surface to 

 7,8 at 500 motors; below tliis depth, the dccroase was slight. 



The distinct layering of water in Worth Bering Sea as demonstrated 

 by temperatiire and chlorinity distribution, T/as shown also by the distribution 

 of dissolved oxygen and nutrient salts. Referring again to Station 97 in 

 which narked changes in temperature and chlorinity occurred between 20 and 

 25 meters, it is seen that this transition zone corresponds exactly to that 

 for nutrient salts. Phosphate concentrations increased from 0,47 microgam 

 atoms per kilo at 20 motors to 1,6 microgram atom per kilo at 25 meters. 

 The corresponding increase in silicate and nitrite concentrations wcsro from 

 8 to 30 and 0,00 to 0,26 respectively. Concentrations for the upper 20 

 meters were constant at the lower values, whereas concentrations for depths 

 of 25 to 65 meters were constant at the higher values, Sirailar distributions 

 were found at most stations sufficiently removed from areas of turbulence 

 and mixing. In general the conclusions regarding the origin and flow of i 



water as based on tenperature and chlorinity measuremonts arc confirmed by 

 tho distribution of dissolved o:cygcn and nutrient salts. 



S urface Observations in the Pacific Ocean , The results from surface 

 observations made while en route from Seattle to Dutch Harbor (Table II) 

 may be sui^Eiarizod as follows: Temperatures and chlorinities were lower on 

 the continental shelf at both ends of the routo than at positions of deep 

 water off tho shelf. A maximum of 14,5° C. was found just .off the continental 

 shelf west of Vancouver Island (Latitude 49° 17' North, Longitude 127° 33' 

 West), The tauparaturo at a sirailar position with respect to the shelf 

 south of the Alaskan Penisula was 10.5° ,C, ■ The minimum temperature found 

 was 7,4 G, in Unii-.iak Pass, A maximur.: chlorinity of 18.21 °/oo Vi/as found in 

 the Gulf .of Alaska due saith of Kodiak Island (54° 08' North, 155° 00' Vfest). 

 The minimui-i value, 17.29 o/qq, was found in the Strait of luna de Fuca. 

 Phosphates wore high in the Strait, 1.6 meg, at, per kilo,, a!id decreased to 

 a minimum of 0.16 meg. at. at the position of .naximur.i tempo ratmiie off the 

 continental shelf near Vancouver Island, Maximura. nitrite values were also 

 recorded in the Strait. Nitrite concentrations in the open sea varied 



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