HR: 0800h
AN: A41A-0023    [Abstracts]
TI: Simultaneous Scanning LIDAR and DOAS Measurements Obtained from High-Sulfur Smelter Emissions During SUDS2004
AU: * Wardell, L J
EM: wardell@eps.mcgill.ca
AF: Earth & planetary Sciences Mcgill University, 3450 University Street, Montreal, QC H3A 2A7 Canada
AU: Strawbridge, K B
EM: Kevin.Strawbridge@ec.gc.ca
AF: Air Quality Processes Research Division, Meteorological Service of Canada, Centre For Atmospheric Research Experiments, 6248 Eighth Line, R.R. #1, Egbert, ON L0L 1N0 Canada
AU: Morrow, W H
EM: bmorrow@resonance.on.ca
AF: Resonance, Ltd., 143 Ferndale Drive North, Barrie, ON L4M 4S4 Canada
AU: Stix, J
EM: stix@eps.mcgill.ca
AF: Earth & planetary Sciences Mcgill University, 3450 University Street, Montreal, QC H3A 2A7 Canada
AB: A mobile scanning LIDAR facility known as RASCAL (Rapid Acquisition SCanning Aerosol Lidar), owned and operated by the Meteorological Service of Canada was deployed for a two week study in June 2004 known as SUDS2004 (Sudbury Study 2004). Two miniaturized spectrometers with a combined range of 295 to 850 nm, under development by Resonance Ltd., were incorporated into RASCAL by sharing the same optical path. The UV absorbances for sulfur dioxide between 300 and 320 nm, as recorded by the spectrometers, were converted to column densities using gas calibration cells and the DOAS technique. This provided simultaneous LIDAR and UV/VIS spectral scanning profiles of emissions from the INCO superstack plume, the second tallest (381 m) industrial stack in the world. The superstack discharges gases and particulates from metal smelting operations with an annual sulfur discharge rate of approximately 2000 kilotons, making this an ideal analog to volcanic gas emissions. To qualify the behavior of gas transport in aerosol plumes, the sulfur dioxide spectral results were combined with the RASCAL three-dimensional real-time images which show the complex mixing behavior of the plume and the boundary layer dynamics. Initially, the ground site was approximately 3.4 km northeast of the superstack on an adjacent hill to provide an unobstructed view of the stack plume for several wind directions. This location allowed for evaluation of both spatial and temporal variations in both parameters. Additionally, the combined system was operated in a zenith-pointing mode, being located directly under the smelter plume. Preliminary results show a strong correlation between sulfur dioxide column concentrations and aerosol concentration.
DE: 5464 Remote sensing
DE: 3360 Remote sensing
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting