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Corpus Systématique Végétale

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Relaxed eddy accumulation measurements of ammonia, nitric acid, sulfur dioxide andparticulate sulfate dry deposition near Tampa, FL, USA

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  • dry deposition velocity
  • relaxed eddy accumulation
  • annular denuder system
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  • LaToya Myles 1,2
  • Tilden P Meyers 1
  • Larry Robinson 3
  • 1) NOAA/Air Resources Laboratory, Atmospheric Turbulence and Diffusion Division, 456 South Illinois Avenue, Oak Ridge, TN 37830, USA
  • 2) Author to whom any correspondence should be addressed
  • 3) Environmental Sciences Institute, Florida A&M University, 1520 South Bronough Street, Tallahassee, FL 32307, USA

The relaxed eddy accumulation (REA) method was utilized tomeasure fluxes of key atmospheric species, specifically ammonia(NH3), nitric acid(HNO3), sulfurdioxide (SO2) andparticulate sulfate (SO42) to vegetation that is characteristic throughout the Tampa Bay Watershed. Three annulardenuder systems (ADS), each consisting of two annular denuders and a filter pack in series,were deployed to accumulate gaseous constituents and fine-fraction particulates(Dp<2.5m) in updraft and downdraft eddies, as well as in the mid-draft velocity range. Relaxed eddyaccumulation samples, which were analyzed by ion chromatography, and continuous meteorologicaldata were collected during the May 2002 Bay Regional Atmospheric Chemistry Experiment(BRACE) near Sydney, FL. For the chemical species of current interest, concentrations were1.64 0.23 for NH3, 2.06 0.24 for HNO3, 3.49 0.50 forSO2 and4.64 0.31gm3 forSO42, and the depositionvelocity (Vd)estimates for NH3, HNO3, SO2 and SO42 were 1.27 3.65, 3.63 1.47, 0.45 0.98 and 0.42 1.00cms1, respectively. The results obtained confirm the expectation that the deposition ofammonia, nitric acid and particulate sulfate was controlled by aerodynamic andquasi-laminar layer resistances and that sulfur dioxide is relatively dependent uponstomatal conditions.

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  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - vecteurs d'importance medicale, nuisances, depredateurs des denrees et materiaux: surveillance des populations et lutte
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  • 1 - Health Sciences ; 2 - Medicine ; 3 - Public Health, Environmental and Occupational Health
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - General Environmental Science
  • 1 - Physical Sciences ; 2 - Energy ; 3 - Renewable Energy, Sustainability and the Environment
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  • 1 - science ; 2 - meteorology & atmospheric sciences
  • 1 - science ; 2 - environmental sciences
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Environmental Research Letters

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