HR: 1340h
AN: A43D-1572    [Abstracts]
TI: Calibration of a Three Wavelength Lidar for Size Discriminated Ambient Particulate Measurement
AU: Martin, R S
EM: rmartin@cc.usu.edu
AF: Utah State University, Dept. of Civil and Environmental Engineering 4110 Old Main Hill, Logan, UT 84322-4110, United States
AU: Zavyalov, V
EM: vladimir.zavyalov@sdl.usu.edu
AF: Space Dynamics Laboratory, 1695 North Research Park Way, North Logan, UT 84341, United States
AU: Bingham, G E
EM: gail.bingham@sdl.usu.edu
AF: Space Dynamics Laboratory, 1695 North Research Park Way, North Logan, UT 84341, United States
AU: Marchant, C
EM: chris.marchant@sdl.usu.edu
AF: Space Dynamics Laboratory, 1695 North Research Park Way, North Logan, UT 84341, United States
AU: Herron, J
EM: josh.herron@sdl.usu.edu
AF: Space Dynamics Laboratory, 1695 North Research Park Way, North Logan, UT 84341, United States
AU: Jones, D
EM: derek.jones@sdl.usu.edu
AF: Utah State University, Dept. of Civil and Environmental Engineering 4110 Old Main Hill, Logan, UT 84322-4110, United States
AU: Jones, D
EM: derek.jones@sdl.usu.edu
AF: Space Dynamics Laboratory, 1695 North Research Park Way, North Logan, UT 84341, United States
AU: Bowman, J
EM: jennifer.bowman@sdl.usu.edu
AF: Space Dynamics Laboratory, 1695 North Research Park Way, North Logan, UT 84341, United States
AU: * Moore, K D
EM: kori.moore@sdl.usu.edu
AF: Space Dynamics Laboratory, 1695 North Research Park Way, North Logan, UT 84341, United States
AB: A three wavelength Lidar has been developed at Utah State University's Space Dynamics Laboratory for the measurement of size segregated ambient particulate matter concentrations as part of the AgLite program. The AgLite program, primarily funded by the U.S. Department of Agriculture's Agricultural Research Service, was developed to quantify particulate emissions from diffuse area sources, such as those typically found around confined animal feeding operations (CAFOs) and tillage operations. The Lidar system is capable of scanning horizontally and vertically across a suspected source area and can identify both spatial and temporal concentration fields which, when combined with locally measured wind field data, can be used to derive source emission estimates. The Lidar measures the relative magnitude of optical scattering by the atmosphere, which is a function of aerosol concentration. A Lidar scan around a source area gives a map of relative aerosol concentration. During an operational experiment, a scan is calibrated by point-sensors collocated with one or more points of the Lidar scan. In order to minimize potential systematic errors, a detailed calibration experiment was designed to compare Lidar return signals with Met One Instruments 8-channel Optical Particle Counters (Model 9722) and Airmetrics MiniVol filter-based samplers configured for collection of TSP, PM₁₀, PM_2.5, and PM₁. The Lidar calibration experiment was performed in July 2007 at a farm owned and operated by Utah State University near Cache Junction, Utah. Multiple datasets were collected during which the Lidar moved between three stares, each a minute in duration, that were collocated with a cluster of MiniVols sampling the four size fractionations and an OPC. Sampler duration was between three and eight hours, depending upon background particulate concentrations. Prior to comparison of these instruments with the Lidar, the MiniVols and OPCs were compared against collocated PM_2.5 and PM₁₀ Federal Reference Method (FRM) samplers operated by the State of Utah Division of Air Quality at the designated air quality sampling site in Logan, Utah to ensure the accuracy of the point sensors. Preliminary analysis demonstrates the average concentrations measured by the MiniVols were within eight percent of the concentrations measured by the FRM samplers at ambient levels greater than 10 μg m^-3 for PM_2.5 and 14 percent for PM₁₀ at 35 μg m^-3. The volume-based concentration determined from the OPCs demonstrated a consistent relationship with the MiniVols filter-based mass concentrations across the observed size ranges. Results of the Lidar comparison with the OPCs and MiniVols will also be presented.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0394 Instruments and techniques
DE: 0480 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting