LARRANCE; PRIMARY PRODUCTION IN MID-SUBARCTIC REGION 



Table 4. — Dissolved nitrate, phosphate, and silicate in 

 upper 50 m of mid-Subarctic Pacific Region (averaged 

 within upper zone oceanographic domains), 1966-68. 



So: z ti 



-It- UJ ^ 



Cruise no. 

 and area 



Kl-66 

 Adak Bay 

 Alaskan Stream 

 Central Subarctic 

 Transitional 

 Subtropic 

 46*-5r40' 



P2-66 

 Adak Bay 

 Alaskan Stream 

 Central Subarctic 

 Transitional 

 46='-5t»40' 



K3-66 

 Adak Bay 

 Coastal 



Central Subarctic 

 Transitional I 

 Transitional II 

 Subtropical 

 46''-51 "Afy 



Kl-67 

 Alaskan Stream 

 Central Subarctic 

 Transitional 

 46 "-53 "53' 



K5-67 

 Adak Bay 

 Coastal 



Alaskan Stream 

 Central Subarctic 

 Transitional 

 46*-51''40' 



K6-67 



Alaskan Stream 

 Central Subarctic 



K7-67 



Adak Bay 



Coastal 



Central Subarctic 



Transitional 1 



Transitional II 



46'-5r40' 



K2-68 

 Alaskan Stream 

 Central Subarctic 

 Transitional 



Nitrate 

 mg-at/m'^ 



Phosphoto 

 mg-at/m^ 



954 



£83 



492 



64 



76 



S79 



571 

 661 

 599 

 627 



772 

 1,1(50 

 534 

 790 

 248 

 579 



554 



800 



1,111 

 1,020 

 596 

 724 

 276 

 610 



104.6 

 88.8 

 81.2 

 60.2 

 29.2 

 77.8 



94.9 

 81.2 

 56.9 

 49.6 

 56.0 



90.4 

 88.7 

 75.4 

 56.7 

 16.8 

 10.0 

 72.0 



83.4 

 82.0 

 69.0 

 79.0 



101.7 

 117.4 

 65.8 

 89.0 

 42.2 

 78.6 



56.9 



90.6 



113.6 

 120.7 

 88.2 

 97.3 

 49.2 

 86.4 



60.0 

 63.1 

 105.7 



Silicate 

 mg-at/m^ 



2,849 

 1,990 

 1,903 

 1,195 

 512 

 1,754 



2,871 

 1,978 

 1,491 

 1,155 

 1,480 



2,499 

 2,331 

 1,692 

 1,143 

 280 

 335 

 1,597 



1,594 

 1,665 

 1,314 

 1,561 



2,192 

 2,806 



811 

 1,704 



588 

 1,247 



942 

 2,026 



3,012 

 2,666 

 1,854 

 1,883 

 792 

 1,725 



868 

 1,022 

 1,415 



chlorophyll maximum suggested that nitrate 

 diffused toward the surface from deeper water 

 was completely assimilated in the deep layer. 

 During the present study, chlorophyll maxima 

 were found at 50 m in June 1966 at lat 44° N and 

 at 100 m in September at lat 43° N. Nitrate was 

 not measured in June but it was undetectable in 



ic 



MARCH 1966 



PHOSPHATE 

 --ft NITRATE 

 - - SILICATE 



SEPTEMBER 1966 

 ; T-2 



---^-.,,-.i-.. "^'^ '- "^'2 AUGUST 1967 



Figure 7. — Dissolved nitrate-nitrite, phosphate, and 

 silicate in the upper 50 m of the mid-Subarctic Pacific 

 Region, 1966-68. 



607 



