Sediment-Water Exchange of Dissolved Nitrogen

When examining fluxes across the sediment-water interface across different estuarine systems, it becomes apparent that the role of DIN flux to the water column is important (table 10.8). Nixon (1981) showed that there was a good relationship between NH4+ flux 

Sample water used Light regime NH4+ production rate (pmol N L-1 h 1) Normalized NH4+ production rate3 (pmol NL 1 mh-1) NH4+ production as fraction of initial DON (% h 1) Rate of production of other measured amine groups (pmol N L-1 h-1) Reference 

Humic pond, swamp, river Waters, and isolated Natural sunlight or simulator, 18 h Total = 860 W m 2 0.05-0.34 0.0032-0.0042 0.25-0.92 Not measured Bushaw et al. (1996) 

Humic Satilla River water Solar simulator, 4 h = mid-June sun at 34oN 0.1 0.011 0.25 Not measured Gao and Zepp (1998) 

Swedish clear-water lake, epilimnion and Natural sunlight, 7 h Total = 345 W m 2 No change No change No change 0.010-0.017 (DFAA) 0.057 + (DCSS, epilimnion only) Jorgensen et al. (1998) 

---