Physics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.3207b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 15, pp.3207-3215
Physics
2
Scientific paper
Experiments were performed during June-July 1992 to determine the impact of dry deposition and fog deposition on surface snow chemical inventories. The fluxes of SO 2- 4 , NO - 3 , Cl - , MSA, Na, Ca, and Al were measured by collecting deposited fog on flat polyethylene plates. Dry deposition fluxes of SO 2- 4 were measured using aerodynamic surfaces. Real-time concentrations of atmospheric particles greater than 0.5 um and greater than 0.01 um were measured using continuous monitors. Filter samplers were used to determine daily average atmospheric SO 2- 4 and MSA concentrations. Also, daily surface snow samples were taken and analyzed for SO 2- 4 , NO - 3 , Cl - , Na + , Ca 2+ , and NHJ + 4 . The real-time concentration data indicate that aerosol particles greater than 0.5 urn are efficiently incorporated into fog droplets. Results also show that condensation nuclei (CN) are not as greatly affected by fog as the larger particles. Fog fluxes of SO 2- 4 and NO - 3 have similar values and are approximately 4 times greater than those of Cl - , an order of magnitude greater than those of MSA, Na, and Ca, and two orders of magnitude greater than those of Al. The fog deposition flux of SO 2- 4 appears to be much greater than the dry deposition flux, based on experimental data. This indicates that dry deposition has a negligible effect on surface snow SO 2- 4 concentrations on days when there is fog. Such a finding is consistent with significant increases in surface snow SO 2- 4 , NO - 3 , and NH + 4 inventories seen after fog events. Cl - surface snow inventories are affected by fog but not as greatly. Variation in surface snow chemical inventories makes it difficult to obtain quantitative estimates of daily chemical fluxes. Surface snow Ca 2+ and Na + are relatively unaffected by post snowfall processes due to low atmospheric concentrations relative to the amount of material in fresh snow. Model results suggest that the fog fluxes have been underestimated by the current sampling technique.
Bergin Michael H.
Caldow R.
Davidson C. I.
Dibb J.
Jaffrezo J. L.
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