

Temperature 





30.0- 



Year deg C 



x k1994 14.5 



q— -©1980-94 14.8 





25.0- 





o 





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TS 



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





Month 



Figure 19. Daily water temperature values with monthly means 



Visibility 



Visibility in coastal nearshore waters depends on the amount of salts, sol- 

 uble 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. 



Visibility was measured with a 0.3-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. 



Chapter 6 Water Characteristics 



43 



