HR: 1330h
AN: A42A-0744    [PDF]
TI: Nitrogen Deposition to the Tampa Bay Watershed
AU: * Poor, N
EM: npoor@hsc.usf.edu
AF: USF College of Public Health, 13201 Bruce B. Downs Blvd, Tampa, FL 33612 United States
AU: Tate, P
EM: ptate@hsc.usf.edu
AF: USF College of Public Health, 13201 Bruce B. Downs Blvd, Tampa, FL 33612 United States
AU: Begum, M
EM: mbegum@hsc.usf.edu
AF: USF College of Public Health, 13201 Bruce B. Downs Blvd, Tampa, FL 33612 United States
AU: Evans, M
EM: mevans@hsc.usf.edu
AF: USF College of Public Health, 13201 Bruce B. Downs Blvd, Tampa, FL 33612 United States
AU: Campbell, S
EM: campbell@eng.usf.edu
AF: USF College of Engineering, 4202 E. Fowler Ave, Tampa, FL 33620 United States
AU: Bhethanabotla, V
EM: venkat@eng.usf.edu
AF: USF College of Engineering, 4202 E. Fowler Ave, Tampa, FL 33620 United States
AU: Bollinger, C
EM: spacepiper1@aol.com
AF: USF College of Engineering, 4202 E. Fowler Ave, Tampa, FL 33620 United States
AU: Ball, A
EM: asball@eng.usf.edu
AF: USF College of Engineering, 4202 E. Fowler Ave, Tampa, FL 33620 United States
AB: An earlier estimate of the direct deposition of nitrogen to Tampa Bay was ~7 kg-N/ha/yr and included the wet deposition of rainfall nitrate and ammonium and the dry deposition of nitric acid, ammonia, nitrate and ammonium. Rainfall and ambient air concentration measurements were made at an urban site within 50 m of Tampa Bay. Rainfall samples were obtained daily from a wet-only precipitation collector, which was part of the NADP AIRMoN. Ambient air concentrations of gases and fine particles were determined from an annular denuder system, operated at 10 l/min for 24-hr/day on a 1-in-6 day schedule, and dry deposition velocities were calculated with the NOAA buoy model using over water meteorological data. This estimate is revised upward to ~8 kg-N/ha/yr and includes corrections for nitric acid collection inefficiencies, the addition of coarse particle nitrate based on mircoorfice impactor measurements, and improved fine and coarse particle deposition velocity estimates from an integrated NOAA buoy/Williams model. With gas, fine aerosol and coarse particle measurements made at a peri-suburban site coupled with deposition velocities from a resistance model, and rainfall concentration measurements from a rural NADP NTN site in Sarasota County, the estimated total nitrogen deposition to the surface of the watershed is ~16 kg-N/ha/yr. The ratios of dry to wet deposition rates are ~1:1 over water and ~4:1 over land.
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0315 Biosphere/atmosphere interactions
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting