ANALYSIS OF PARTICULATE SULFUR AND LEAD GRADIENT DATA COLLECTED AT ARGONNE NATIONAL LABORATORY

Two automatic aerosol particle samplers were operated at heights of 11.5 and 34.5 m on the meteorological tower at Argonne National Laboratory (about 40 km southwest of Chicago) during the summer of 1976. Data obtained during one week of intensive study permit evaluation of the horizontal transport of both particulate sulfur and lead; sulfur was found to be associated with south-westerly flow, while lead appeared to originate in Chicago. By combining measurements of particle concentration gradients with wind and temperature gradients, deposition velocities of particulate sulfur have been computed for a range of atmospheric conditions. The resulting evaluations show a strong dependence on atmospheric stability and on wind speed. Although larger than values normally associated with particulate sulfur, the deposition velocities, averaging about 1.4cm s-1, compare favorably with both the momentum transfer velocity and some recently reported results obtained by application of eddy correlation methods. © 1979.