Eddy correlation measurements of the resistance to vertical transport of ozone

Thesis/Dissertation · Sat Jan 01 00:00:00 EST 1983

OSTI ID:6269525

Eastman, J A

The major objective of this research project 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. The ozone flux was determined by computing the covariance between the vertical wind speed and the ozone concentration using both analog and digital methods. The vertical wind speed was measured with a vertical propeller anemometer. The ozone concentration was measured with a chemiluminescent detector in which ozone in the ambient air was reacted with an excess of nitric oxide NO. Measurements made over a grass field showed a gradual decrease in the total resistance over an eight-week period in the spring. 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 was 2.4 s/cm. 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.

• OSTI ID: 6269525
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
OZONE
ENVIRONMENTAL TRANSPORT
UPTAKE
CORRELATIONS
EQUATIONS
GLYCINE HISPIDA
GRASS
MAIZE
MATHEMATICAL MODELS
MEASURING METHODS
TROPOSPHERE
VARIATIONS
WIND
CEREALS
EARTH ATMOSPHERE
LEGUMINOSAE
MASS TRANSFER
PLANTS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)