||Theoretical Investigation of the Pressure and Temperature Dependence of Atmospheric Ozone Deposition of Trees.
Larson, T. V. ;
Vong, R. J. ;
||Washington Univ., Seattle. Dept. of Civil Engineering. ;Oregon State Univ., Corvallis. Dept. of Atmospheric Sciences.;Corvallis Environmental Research Lab., OR.
Air pollution affects(Plants) ;
Atmospheric temperature ;
Atmospheric pressure ;
High altitude tests ;
Appalachian Mountains ;
Flux density ;
Mixing height ;
Mass transfer ;
Eastern Region(United States)
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Methods for describing the exposure patterns of forests to atmospheric ozone concentrations are compared with special emphasis on the situation at high altitudes, such as the Appalachian Mountains of the eastern USA. Limitations to the use of ozone concentration as mass per unit volume are discussed and a correction for temperature and pressure changes is derived. If identical ozone mass concentrations were measured at two sites separated by 2000 m elevation, the ozone flux at the lower site would exceed the flux at the higher site by 4-8% due to the temperature and pressure effects on both air volume and ozone deposition velocity. It is recommended that ozone exposures be described in terms of 'flux-corrected' mass concentrations or volumetric mixing ratios when ambient ozone data from sites at different altitudes are to be compared. (Copyright (c) 1990 Elsevier Science Publishers Ltd, England.)