SUMMARY 



1. Three dynamic topographic maps of the Ice Patrol area in the 

 vicinity of the Grand Banks, made during the 1941 season, have been 

 described. 



2. The seasonal variations of the Labrador Current in the Grand 

 Banks region during 1941 have been compared with other variations 

 found during the previous seven ice seasons and the volume of flow, 

 mean temperature of the current, and minimum observed temperature 

 have been tabulated for the entire 77 occupations of three selected 

 sections over the 8-year period 1934-41. 



3. Temperature-salinity correlations for Labrador Current water, 

 mixed water, and Atlantic Current water found in the vicinity of the 

 Grand Banks during the three surveys made during 1941 have been 

 compared with those for the 8-year mean 1934-41. 



4. A long-range trend in water characteristics found in the Grand 

 Banks region at different levels has been discussed in terms of tempera- 

 ture, salinity, and density. 



5. Fluctuations in the boundary between the Labrador and Atlantic 

 Currents have been expressed numerically and tabulated for each of 

 the 27 surveys made during the 8-year period 1934-41, and compared 

 with fluctuations in the Labrador Current and with fluctuations in the 

 difi^erence in sea level between Bermuda and Charleston. A tentative 

 forecast formula for predicting the seasonal average position of the 

 boundary between the Labrador and Atlantic Current is discussed. 



6. Temperature, salinity, and dynamic topography in the vicinity of 

 an iceberg off the eastern approach to the Strait of Belle Isle from 

 observations made with bathythermograph and reversing thermometers 

 and water bottle methods are presented with conclusions that the 

 measurable effects of the presence of the berg are limited to an area of 

 less than about 500 yards radius from the berg and that a true portrayal 

 of conditions depend on accurate measurements which are truly synoptic. 



7. The volume of flow, mean temperature, and heat transfer of the 

 Labrador Current off South Wolf Island and of the West Greenland 

 Current off Cape Farewell found during the 1941 postseason cruise have 

 been tabulated along with comparable values from other occupations 

 of these sections made during the period 1928-41. 



8. The change in thermal conditions in the intermediate water of the 

 Labrador Sea, first found in 1940, has been noted as continuing in 1941. 



In the following table are given the data collected during the 1941 

 season and post-season cruises. The individual station headings give 

 the station number, date, geographic position, depth of water, and 

 dynamic height of the sea surface used in the construction of the 

 dynamic topographic charts shown in figures 2, 3, 4, 22, 24, and 27; 

 except that for stations 3540 to 3551, taken in the vicinity of an ice- 

 berg, the bearing and distance of the station from the berg has been 



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