Diamond Shoals Lightship (Figure 15, Table 15) 
In discussing the 1956 observations Bumpus explained the unique 
hydrographic conditions which prevail at this station and the reader is 
referred to his remarks (Bumpus, 1957, b.) 
Ten day means of surface temperature from Jmuary through March 
are slightly above the mean for 1923-1956 and indicate less frequent pene- 
trations of cold coastal water across Diamond Shoals than occurred in 
1956. From April through September temperatures are more uniform and 
stay above the mean and above the 1956 readings. Except for October, 
temperatures stayed high throughout the fall and early winter. 
In terms of daily observations, the surface temperature range 
was from )°-8)°F; bottom temperature from 56°-61°F. 
The progressive plot of 10 day means shows 1957 to be appre- 
ciably warmer at all depths than was 1956. 
Surface salinity ranged from 36.3 °/oo to 32.5 °/oo; bottom 
salinity from 36.5 °/oo to 3.2. 
From late June to late September surface and bottom salinities 
remained quite uniform and close together. 
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