Implications of Heterogeneous Chemistry of Nitric Acid for Nitrogen Deposition to Marine Ecosystems: Observations and Modeling |
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| Authors: | Pryor S C Barthelmie R J Schoof J T Sørensen L L Erickson D J |
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| Institution: | (1) Atmospheric Science Program, Geography, Indiana University, Bloomington, IN, 47405;(2) Dept. of Wind Energy & Atmospheric Physics, Risø National Laboratory, Dk-4000 Roskilde;(3) Atmospheric Science Program, Geography, Indiana University, Bloomington, IN, 47405;(4) Atmospheric Science Program, Geography, Indiana University, Bloomington, IN, 47405;(5) Dept. of Wind Energy & Atmospheric Physics, Risø National Laboratory, Dk-4000 Roskilde;(6) Oak Ridge National Laboratory, Computer Science & Math. Division, Oak Ridge, TN, 37831 |
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| Abstract: | Size resolved particle composition and nitric acid (HNO3)measurements from the ASEPS'98 experiment conducted in the BalticSea are used to provide observational evidence of substantialgas-particle transfer of oxidized nitrogen (N) compounds in themarine boundary layer. We then focus on the importance ofHNO3 reactions on sea salt particles in determining spatio-temporal patterns of N dry deposition to marine ecosystems.Modelling results obtained assuming no kinetic or chemical limiton HNO3 uptake and horizontally homogeneous conditions withnear-neutral stability, indicate that for wind speeds 3.5 – 10 ms-1 transfer of HNO3 to the particle phase to formparticle nitrate (NO3
-) may decrease the N depositionvelocity by 50%. We extend this research using the CHEM-COASTmodel to demonstrate that, in a sulphur poor environment undermoderate wind speeds with HNO3 concentrations representativeof those found in the marine boundary layer, inclusion ofheterogeneous reactions on sea spray significantly reducesmodelled NO3
- deposition in the near coastal zone. |
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| Keywords: | HNO dry deposition phase transfer particle marine boundary layer |
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