Density 
112. Present data year. Daily density measurements show a large varia- 
tion throughout the year (Figure 35 and Table 15). Monthly mean values (Fig- 
ure 36) generally varied inversely with water temperature such that maxima 
occurred during the cold months--January, February, November, and December-- 
and minima during the summer months (Table 15). The annual mean density was 
1.0227 g/om> with an associated standard deviation of 0.0015 g/cm. 
113. 1982 versus 1981. Variability in daily density values throughout 
1982 was greater than that for 1981; however, the 1982 monthly and annual 
means (Figure 36) and distribution (Figure 37) were lower than those for 1981. 
This trend is reasonably consistent with a pattern of monthly mean temperature 
differences which indicate that 1982 temperatures were greater than those for 
1981. However, during a few months this inverse relationship between tempera- 
ture and density did not occur, indicating that salinity differences were 
probably responsible for the density variations. These may have resulted from 
either large-scale circulation of nearshore water masses or locally-induced 
salinity changes due to rainfall. 
1,029 LEGEND 
© MONTHLY MEAN VALUE 
DENSITY (G/CC) 
Figure 35. Daily surface water density 
for 1982 
fl 
