308 
BULLETIN OF THE BUREAU OF FISHERIES 
TEMPERATURE OF WATER DURING SUMMER 
It has been pointed out, under the section devoted to the surface temperature 
from mouth to head, that the distribution of the surface temperatures during the 
summer cruises was quite variable. There are indications that the surface tempera- 
tures may be much warmer at the southern end than at the northern, as when on 
August 21, 1920, the air temperatures were high at the lower end of the bay and low 
temperatures and rainy weather prevailed at the upper end, or warmer at the northern 
end than at the southern, as during the cruise of July, 1916. At the bottom there 
was evidence to show that the winter condition had been reversed, so that the coldest 
water was at the mouth of the bay. These conditions at 20 and 30 meters are illus- 
trated in Table 3. It is clear that there was an increasing range of deep-water 
temperatures (as an example, at 20 meters) passing from G to A. On these cruises 
the lowest temperature observed in the whole bay was that at the bottom of area G, 
just the reverse of the condition existing in the winter, when the highest temperatures 
observed in the whole bay were at the bottom of the same area. Observations made 
outside of the bay at the beginning of the August cruise show that as far as the 200- 
meter contour, the temperatures (from 8° C. to 10° C. at all depths) were considerably 
lower than those of the bay and in a decreasing range as far as the 80-meter contour. 
Also, the temperatures at the surface were somewhat less than those of the surface 
of the bay. 
During the summer cruises the surface water was found to be almost always 
the warmest, during the warmer part of the day at least, the temperature decreasing 
with the depth (anothermous), as in August, 1920, at G, surface 27.0, 10 meters 
20.2, 20 meters 17.2, 23.6 meters 15.5; and at R, surface 24.2, 45.8 meters 23.9; or as 
in May, 1921, at G, surface 19.0, 10 meters 17.4, 22.8 meters 15.2, and at R, surface 
20.0, 10 meters 20.0, 20 meters 15.5, 30 meters 15.3, 40 meters 15.3, 47.6 meters 15.1. 
The cruise of July, 1916, was made during a time when there was much rain and cloudy 
weather, and it had a marked effect on the vertical distribution of the temperature. 
At A the temperatures were as follows at 9 a. m.: Surface 24.3, 5 meters 24.9, 10 
meters 24.6, 20 meters 24.1, 30 meters 23.9, 40 meters 24.1; and at R, surface 25.2, 5 
meters 25.5, 10 meters 25.5, 20 meters 25.0, 30 meters 24.6, 40 meters 24.9, 46 
meters 25.2 at 1.35 p. m. In general, all over the bay the surface temperatures 
were somewhat lower than those of the water a few meters below, and this condition 
was independent of the time of day. 
TEMPERATURE OF WATER DURING FALL 
During the cruise of September, 1916, the temperature values observed at the 
bottom (no data at 20 and 30 meters are available) showed an increasing range from 
the mouth northward as during the summer. No data were obtained at area G 
during that cruise, but at both F and E, which are areas in the mouth of the bay, 
the bottom temperatures were 22.8 at 13 meters and 22.2 at 16 meters, while the 
bottom temperatures for the following areas, marking regions of considerably greater 
depth even than those of F and E, were higher: A 23.4, J 24.6, S 24.8, X 24.8, and 
Y 24.8. During the cruise of October, 1920, the range of temperature values for 20 
and 30 meter depths indicated that the summer condition was changing into that of 
the winter, while the data for the December, 1920, cruise indicated that this latter 
condition was established, the temperatures decreasing in range again from the mouth 
toward the head with the highest temperature in the whole bay at D. (Table 4.) 
