Eddy-correlation measurements of the resistance to vertical transport of ozone
The major objective was to measure the resistance to ozone uptake over a variety of surfaces and under a variety of conditions. These resistance data along with new data on reaction-rate coefficients and the concentration of trace species can be incorporated into increasingly sophisticated models to provide a better understanding of the tropospheric ozone budget. Measurements made over a grass field showed a gradual decrease in the total resistance over an eight-week period in the spring. The data collected under overcast skies and before the grass had begun to turn green, was indicative of ozone destruction by nontranspiring surface material. The average resistance for the eight-week period was 2.3 s/cm. Eddy correlation measurements made over a mature maize crop showed a strong diurnal trend with minimum resistance occurring at midday. The average total resistance, 2.4 s/cm, was nearly the same as that measured over grass; however, the flux was about twice as large as that measured over grass since ozone concentrations were two times higher. Data collected over soybeans showed that the effective bulk-surface resistance was highly correlated to the canopy resistance to water-vapor transport, indicating the important role stomata play in controlling ozone uptake.
- Research Organization:
- Michigan Univ., Ann Arbor (USA). Dept. of Atmospheric and Oceanic Science
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5924333
- Report Number(s):
- DOE/NBM-3015363; ON: DE83015363
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
OZONE
UPTAKE
DAILY VARIATIONS
ENVIRONMENTAL TRANSPORT
EXPERIMENTAL DATA
GLYCINE HISPIDA
GRASS
MAIZE
CEREALS
DATA
GRAMINEAE
INFORMATION
LEGUMINOSAE
MASS TRANSFER
NUMERICAL DATA
PLANTS
VARIATIONS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)