NUTRIENT FLUXES 



Figures 23-4 and 23-5 illustrate data for several water quality variables at 

 three diverse locations in Kaneohe Bay. "OF" is v^thin about 100 meters of 

 the major sewer outfall; "S" is in the southeast sector of Kaneohe Bay; and 

 "C" is in the central sector. Samples have also been taken from the northwest 

 sector, where values are similar to those of the central sector. 



In order for net exchange of material to occur between two water masses, a 

 concentration gradient of that material is required. An estimate of the net mass 

 flux between two well-mixed source waters may be obtained as the exchange 

 volume times the concentration difference between those water masses. The 

 concentration differences illustrated by Figure 23-4 qualitatively demonstrate 



OF 

 S 



c 



0. 



I 



PO, 



2 



0.0 



5 



1.0 



0.0 



20 



4.0 



OF 



C- 



0.0 



NO 



0.5 



OF 



s- 



dissolved 

 organic N 



0.0 5.0 10.0 



ALL UNITS ARE nrimole/m^ 



Figure 23-4. Concentration of Selected Water Quality Variables 

 Near the Kaneohe Outfall (OF), Near the Middle of the 

 Southeast Sector (S), and Near the Middle of the Central 



Sector (C). 

 NOTE: The bars represent the mean values ± one standard error unit. 



353 



