OBSERVATIONS 



Messenger time and date, CGT 



Stations 



The 1939 stations, which followed 

 closely those sections of 1938 perpen- 

 dicular to the Aleutian Chain and ex- 

 tending to Cape Newenham, were con- 

 fined to the inner area of Bristol Bay. 

 In 1940 those sections originating north 

 of the Chain and reaching to and along 

 Cape Newenham were repeated. An 

 additional perimeter of stations was 

 observed from Cape Newenham along 

 Nunivak Island, the Pribilof Islands, 

 and the Unimak Island and Pass. A 

 third series of stations was observed 

 beginning north of Akutan Pass and 

 proceeding through Unimak Pass, along 

 the Chain, around the Shumagin Islands, 

 and ending at Sanak Island. In 1941, 

 only four sections were made- -one 

 each from Unalaska Island and Unimak 

 Island to the Pribilof Islands, and two 

 east-west sections across Bristol Bay. 



The number of stations observed was 

 greatly increased in 1939- -331 com- 

 pared to 128 in 1938, 184 were ob- 

 served in 1940, and 40 in 1941. The 

 1941 investigations were terminated 

 abruptly because of a change in the 

 operating schedule of the Rediving. 



Hydrographic casts 



The hydrographic casts in 1939 and 

 1941 conformed to the depth interval 

 used in 1938, but in 1940 standard 

 sampling depths were often changed 

 to other intervals. 



In 1938 water samples were drawn 

 for the analysis of only chlorinity and 

 dissolved oxygen, but during the three 

 following years the water was ana- 

 lyzed for phosphates, nitrites, and 

 silicates as well. However, no bottonn 

 samples were collected or currents 

 measured. 



NOTES ON TABULATED DATA 



Station heading 



Station 

 Position 



Weather condition 



B blue sky, cloudless 



C cloudy 



D drizzle 



E fog 



M mist 



O overcast 



P passing showers of rain 



R rain 



S snow, snowy weather, or snow 



falling 

 V variable 

 Z hazy 



Barometer, in inches 



Wind 



Direction 



Force in Beaufort scale 



Sea 



Direction 

 Height 



0. No swell ) 



1. Moderate swell (Calm or 



2. Heavy swell )light sea 



3. No swell )Moderate 



4. Moderate swell (sea 



5. Heavy swell 



6. Rather rough sea 



7. Rough sea 



8. Very rough sea 



9. Mountainous sea 



Temperature, in F. 

 Depth, in meters 



Observed data 



DEPTH Depth in meters 



TEMP Temperature from revers- 

 ing thermometer, in °C. 



SAL Salinity, as obtained from 



chlorinity by Knudsen's 

 tables (1901). Mohr method. 



OXY Dissolved oxygen concen- 



tration expressed as milli- 

 gram-atoms of oxygen per 

 kilogram of sea water. 

 Winkler (American Public 

 Health Association, 1923) 

 method. 



