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Main Title Technique for Estimation of Dry Deposition Velocities Based on Similarity with Latent Heat Flux.
Author Pleim, J. E. ; Finkelstein, P. L. ; Clarke, J. F. ; Ellestad, T. G. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. National Exposure Research Lab. ;National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div.
Publisher 1997
Year Published 1997
Report Number EPA/600/A-97/059;
Stock Number PB97-195507
Additional Subjects Latent heat ; Heat flux ; Air pollution effects(Plants) ; Photochemical reactions ; Air pollution sampling ; Acid rain ; Ozone ; Sulfur dioxide ; Stomata ; Plant growth ; Humidity ; Wind velocity ; Air temperature ; Trends ; Dry deposition
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB97-195507 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 26p
Field measurements of chemical dry deposition are needed to assess impacts and trends of airbrone contaminants on the exposure of crops and unmanaged ecosystems as well as for the development and evaluation of air quality models. This paper describes an intermediate technique which can give accurate estimates of dry deposition velocity for chemical species which are dominated by stomatal uptake such as ozone and SO2. This method can give results that are nearly the quality of eddy correlation measurements at much lower cost. The concept is that bulk stomatal conductance can be accurately estimated from measurements of latent heat flux combined with standard meteorological measurements of humidity, temperature, and wind speed. The technique is tested for a field experiment where high quality eddy correlation measurements were made in a soybean field in Kentucky. Over a four month period, which covered the entire growth cycle, this technique showed very good agreement with eddy correlation measurements for ozone.