600 
BULLETIN OF THE BUREAU OF FISHERIES 
Locality 
Approximate temperature 
Surface 
60 meters 
100 meters 
Bay of Fundy. . . ... 
°C. 
10-12 
16-20 
°G 
7. 5- 9 
5.5- 8 
°C. 
7-8 
4.5-6 
Off Massachusetts Bay . 
The fact that the deep water is warmer in the Bay of Fundy, and for that 
matter in the northeastern part of the gulf generally, than in the southwestern, while 
the surface is so much colder, deserves special emphasis because of its bearing on 
the circulation of the two regions (p. 924). 
In St. Marys Bay the relative difference between surface and bottom temper- 
ature increases from the mouth, inward, in July, as follows, if the total depth of 
water be taken into consideration. 
Surface and bottom temperatures at successive localities from the mouth of St. Marys Bay toward its 
head, July, 1915. ( From Craigie and Chase, 1918.) 
Station 
21 
16 
11 
8 .. 
6 .: 
4_. 
2.. 
1 .. 
Depth, 
meters 
Surface 
tempera- 
ture 
Bottom 
tempera- 
ture 
° C. 
° C. 
43 
9. 28 
8. 06 
34 
10. 12 
8.44 
32 
11.96 
9. 29 
33 
12.98 
9. 03 
21 
13. 52 
10.36 
28 
13. 95 
11. 37 
13 
13. 78 
11. 82 
7 
14.8 
13.40 
The water is likewise kept comparatively homogeneous in temperature out to the 
100-meter contour over the coastal banks off western Nova Scotia by active tidal 
stirring throughout the summer. Dawson (1905, p. 15) has already called attention 
to the thermal effect of vertical circulation in this region, where the topography of 
the bottom causes “a long trail or wake of colder water to extend from islands or 
shoals along the line of the current; as, for example, north and south from Lurcher 
Shoal.” He also points out that “when the islands and shoals are numerous, the 
general effect of these strong currents is to chill the water in the vicinity of the coast 
by mixing the surface water with the colder water from below.” As the result of 
local disturbances of this sort, the vertical range of temperature is much narrower 
along the 100-meter contour off Lurcher Shoal in August than at corresponding loca- 
tions over the western slope of the gulf. The temperature on German Bank has 
proved almost perfectly homogeneous from surface to bottom in August and Septem- 
ber, as follows: 
German Bank approximate temperatures 
Depth, meters 
Aug. 14, 
1912, 
station 
10029 
Aug. 12, 
1913, 
station 
10095 
Aug. 12, 
1914, 
station 
10244 
Sept. 2, 
1915, 
station 
10311 
o 
°c. 
10. 33 
°c. 
8. 89 
°c. 
10. 00 
°C. 
9.44 
20 - — - 
9. 83 
8. 67 
9. 85 
10. 30 
40 
9. 67 
8. 61 
9.64 
10.20 
60 
9.61 
8. 56 
9.65 
10.10 
