PHYSICAL OCEANOGRAPHY OE THE GULF OF MAINE 
601 
Dawson's (1922) records for 1904 and 1907 show only a slightly greater vertical 
range of temperature close in to the west Nova Scotian coast, with little change dur- 
ing the month of August. 
Temperatures for 1907. ( After Dawson, 1922) 
Depth 
Seventeen miles south- 
westerly from Y armouth 
Six miles 
easterly 
from 
Lurcher 
Shoal 
July 29 to 31 
Aug. 28 to 31 
Sept. 2 
°C. 
9. 7-10. 8 
7.5- 8 
7. 2- 7. 5 
°C. 
9. 4-10. 0 
8-8.6 
7.8- 8 
°C. 
10.8 
9.2 
Tidal currents keep the water as thoroughly stirred near Cape Sable as they do 
on German Bank, so that Dawson (1922, station Q) found the temperature virtually 
uniform (about 4°) from surface to bottom 12 miles south of the cape on July 2, 1907 
Observations taken by Dawson in this neighborhood later in the summer, however^ 
in three different years, and from the Grampus in 1914 and 1915, show that the 
surface then warms rapidly enough to produce a considerable range of temperature 
by the end of August, except when temporarily disturbed by the tide, as just de- 
scribed (p. 593). 
Temperatures 12 miles south of Cape Sable, °C. ( From Dawson, 1922, station Q) 
Depth 
July 2, 
1907 
July 10, 
1907 
July 13, 
1907 
July 19, 
19041 
July 20, 
1904 1 
July 20, 
1904 2 
4.2 
6.7 
7.0 
9.4 
12.0 
5.0 
3.9 
6.4 
6.4 
3.0 
3.3 
4.3 
3.9 
2.8 
2.8 
3.9 
i High tide. J Low tide. 
Grampus temperatures near Cape Sable, °C. 
Depth 
July 25, 
1914, sta- 
tion 10230 
Aug. 11, 
1914, sta- 
tion 10243 
10.28 
13.61 
3.03 
7.47 
3.14 
3.51 
A wide vertical range of temperature also has been recorded across the whole 
breadth of the continental shelf, in the offing of Shelburne, for the last week of July, 
both in 1914 and in 1915, with the surface averaging about 7.3° warmer than the 
50-meter level for all these stations 26 (maximum difference about 11°, minimum 
4.6°). This thermal contrast continues to develop during the summer near the land 
off Shelburne, where the surface (15°) was nearly 13° warmer than the bottom (2.2°) 
at a depth of 70 to 80 meters on September 6, 1915 (station 10313). 
s 3 Grampus stations 10230 to 10232; Acadia stations 37 to 40 (Bjorkan 1919). 
