Deposition Velocities of SO2 and O3 over Agricultural and Forest Ecosystems |
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Authors: | Finkelstein Peter L. |
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Affiliation: | (1) Atmospheric Sciences Modelling Division, NOAA, Research Triangle Park, N.C., U.S.A., 541 1379) |
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Abstract: | The results of field studies that measured the flux anddeposition velocity of SO2 and O3 are reported. Three of the studies were over agricultural crops (pasture, corn, and soybean), and two were over forest (a deciduous forest and a mixed coniferous–deciduous forest). In all cases the deposition velocity for SO2 was higher than that for O3. Diurnal cycles of SO2 deposition velocity were similar in shape, but not magnitude for all surfaces; however those for O3 showed some difference between forest sites where the peak was in the morning, and the agricultural sites where the peak occurred at mid-day. Seasonal cycles of SO2 were affected by deposition to surfaces when leaves were not active, yet surface conductance is significant, but not for O3 where stomatal uptake is the primary pathway for deposition.(On assignment to the National Exposure Research Lab., US EPA) (e-mail: |
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Keywords: | deposition velocity dry deposition flux ozone sulfur dioxide |
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