Recent measurements of the rates of ozone removal from the atmosphere by land surfaces. Paper 78-30. 5.

Author: Wesely, M. L.
Published: United States : [publisher not identified], 1978.
Springfield, Va. : National Technical Information Service, [approximately 1978]
Physical Description: microfiche : negative ; 11 x 15 cm
Additional Creators: Cook, D. R., Eastman, J. A., and Hicks, B. B.

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Summary

The factors that control the uptake of airborne pollutants at land surfaces are highly varied and depend to a large extent on the chemical properties of the pollutant considered. Since ozone is not very soluble in pure water and is highly reactive with many substances, its uptake or destruction should be retarded by liquid water but enhanced by biological activity that produces substances susceptible to attack by ozone. It would appear that the variability in surface resistance to uptake of ozone is quite large due to the great natural variations in chemical composition, temperature, and water content of outdoor surfaces. Thus, the rates of removal of ozone from the atmosphere can be difficult to predict when flow over numerous kinds of surfaces is involved, such as in episodes of rather high ozone concentrations that occur over regional-scale distances (about 1000 km). The purpose of the present study is to examine measurements of ozone flux obtained directly by eddy-correlation techniques above certain agricultural surfaces, and to determine the surface properties, including estimated stomatal resistance, that are important in regulating the rate of ozone destruction at the surface. The two experimental sites were a large field of full-grown, healthy maize in Sangamon County near Springfield, Illinois, and the second site was a field of senescent maize in Rush County near Indianapolis, Indiana.

Report Numbers

CONF-780636-11

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NTIS collection.

Note

DOE contract number: W-31-109-ENG-38
OSTI Identifier 6643363
Research organization: Argonne National Lab., IL (USA).

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