en 

 d) 

 "^ 20.0 



Temperature 

 Year deg C 



*1990 16.4 



©1980-90 14.7 



o.oH 1 1 , 1 , , r 



JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 

 Month 



Figure 19. Daily water temperature values 

 with monthly means 



Visibility 



54. Visibility in coastal nearshore waters depends on the amount of 

 salts, soluble organic material, detritus, living organisms, and inorganic 

 particles in the water. These dissolved and suspended materials change the 

 absorption and attenuation characteristics of the water that vary daily and 

 yearly. 



55. Visibility was measured with a . 3-m-diam Secchi disk, and similar 

 to water temperature, variation was related to onshore and offshore winds. 

 Onshore winds moved warm clear surface water toward shore, whereas offshore 

 winds brought up colder bottom water with large concentrations of suspended 

 matter. Figure 20 presents the daily and monthly mean surface visibility 

 values for the year. Large variations were common, and visibility less than 

 1 m was expected in any month. Monthly means are given in Table 8. 



46 



