||Wide Area Ozone Dry Deposition Measurements.
Godowitch, J. M. ;
Ching, J. K. S. ;
||Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Air pollution ;
Aerial surveys ;
Boundary layers ;
Atmospheric sciences ;
Ozone deposition ;
Ozone concentration fluctuations ;
Aircraft measurements ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
An experimental study to investigate the temporal and spatial variations of ozone deposition was conducted as part of the Northeast Regional Oxidant Study program in August 1979. Ozone fluctuations and fluxes were obtained from a fast response ozone sensor on board a research aircraft equipped with gust probes and fast response temperature probes for turbulence measurements. To obtain aerial measurements of ozone deposition, low level aircraft runs were performed in the mixed agricultural region around Lancaster, Pennsylvania and in forested terrain to the northwest. Statistical results derived from two case study days show a maximum ozone deposition velocity of 0.90 cm/s over the cropland during the early afternoon when convective turbulence was strongest. Ozone flux decreased with height, and it was weaker in a valley compared to a forested ridge due to the presence of a lake along the valley floor. Ozone fluxes were negative during the daytime period in agreement with surface layer tower measurements.