30.0-1 



15.0 



5.0 



Temperature 

 Year deg C 



.^— «1992 H.6 



o-.. -01980-92 l^.g 



1 1 1 1 1 1 1 1 1 1 1 



JAN FEB MAR APR ,MAY JUN ■..:UL 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, soluble organic material, 

 detritus, living organisms, and inorganic particles in the water. These dissolved and suspended mate- 

 rials 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. 



42 



