brought up colder bottom water with large concentrations of suspended matter. 

 Figure 20 shows 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 inTable 8. 





Year Mean, m 





7.0- 



X <1995 2.0 







0— -©1980-95 2.1 





6.0- 







5.0- 





£ 







>, 













'^ 



4.0- 



. . .y\K 



.a 





/ q\ 









'm 





JC • \\ 



"> 





■ ■ ■ ■ "/<y ■ \ ^ 





3.0- 



y^ / \ \ 



(U 











~y^ ' / ■ \ \ ■ 



o 





. . A .. . - ■; .. ./ \ - \ - 



$ 





y^ . . . .^..^ .... \ "b 





2.0- 



•v^-'"";-; ■ \^.,.^. ;•;• 





1.0- 



.."■^.V." .'.. ■ ■ " "■ ".^"T^^'^'^^^^J^.'. 





0- 



• • • - - -■ - • 





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





Month 



Figure 20. Daily water visibility values with monthly means 



Density 



Daily and monthly mean surface density values, plotted in Figure 21, were 

 measured with a hydrometer. Monthly means are also given in Table 8. These 

 values are direct readings from the hydrometer. Corrections for differences 

 between ocean water temperature and jar water temperature, as well as use of 



44 



Chapter 6 Water Characteristics 



