138 fathoms. 



On the vessel's return from northern Labrador the oceanographic stations estab- 

 lished or reoccupied in early summer were duplicated. During the period August 20th to 

 25th the Lake Melville grid was reoccupied and Hamilton Inlet from August 26th to 28th. 

 Likewise the river and Grand Lake surveys were repeated August 19th to 22nd. 



B. Coastal and Fjord Study 



A series of bathythermograph observations five to ten miles apart was made 

 from the western portion of the Strait of Belle Isle to Saglek Bay in northern Labrador 

 to study general hydrographic conditions not encountered in fjord studies. Whenever 

 possible, posits made during the northward passage were duplicated on the trip south 

 allowing direct comparison of thermal conditions between early and late summer. A 

 total of 176 observations were made. 



In northern Labrador oceanographic work was centered around Nain and Hebron. At 

 Hebron on July 19th, 23rd, and 31, six of the oceanographic stations established by the 

 Blue Dolphin in 19^9 were reoccupied for the first time, and one new station was estab- 

 lished further off shore. This made it possible to observe any short-term changes in 

 the hydrographic conditions in this topotypical fjord. Hebron Fjord is of special in- 

 terest because the temperature of the bottom water as observed in both 19^9 and 1952 was 

 approximately - 1.8°C. A better understanding of this unusually cold bottom water and 

 its source would be greatly aided by observations at other seasons . 



At Nain from August 11th to l4th a longitudinal section of nine oceanographic 

 stations established by the Blue Dolphin in 1951 was reoccupied with. the addition of one 

 new station. These stations had been placed in strategic geographic locations from the 

 head of Nain Bay through the maze of islands via Strathcona Run to the open sea, a dis- 

 tance of about forty-two miles. Nain Bay is in itself a more or less typical fjord seven- 

 teen miles in length. 



In both 1951 and 1952 the observed water temperature below fifty meters in Strath- 

 cona Run was approximately 3.0 C, while the temperature at corresponding depths both in 

 Nain Bay and at the outermost station of the section was less than minus 1.0 C. The 

 transitions among these three distinct bodies of water were traced by several bathyther- 

 mograph sections totaling twenty-six posits. For a more thorough understanding of this 

 warming, and its biological implications, observations at other seasons are most desirable, 



Single stations were established at Kai-Kai Inlet in the Cape Mugford area and 

 Salt Water Pond off Anaktalik Bay south of Nain. Kai-Kai Inlet, with a maximum depth 

 of eighty-seven fathoms, is separated from adjacent waters by a six fathom sill. Vary- 

 ing degrees of stagnation were observed below fifty meters. In Salt Water Pond which is 

 connected to Anaktalik Bay only at high tide, complete stagnation and production of hy- 

 drogen sulphide was observed at forty meters, the first such instance recorded by the 

 Blue Dolphin in Labrador coastal observations. 



******* 



The Blue Dolphin in 1952 occupied 123 oceanographic stations (including reoccupat- 

 ions), 55 STD stations (including reoccupations ), made 606 bathythermograph observations, 

 and collected 32 bottom samples. 



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