HR: 0800h
AN: A41D-0739    [Abstracts]
TI: Hygroscopic, Morphological, and Chemical Properties of Agricultural Aerosols
AU: * Hiranuma, N
EM: naruki10@tamu.edu
AF: Department of Atmospheric Sciences, Texas A&M University, 1204 Eller O&M Bldg. MS 3150, College Station, TX 77843, United States
AU: Brooks, S D
EM: sbrooks@ariel.met.tamu.edu
AF: Department of Atmospheric Sciences, Texas A&M University, 1204 Eller O&M Bldg. MS 3150, College Station, TX 77843, United States
AU: Cheek, L
EM: lcchee@gmail.com
AF: Department of Atmospheric Sciences, Texas A&M University, 1204 Eller O&M Bldg. MS 3150, College Station, TX 77843, United States
AU: Thornton, D C
EM: dthornton@ocean.tamu.edu
AF: Department of Oceanography, Texas A&M University, 1204 Eller O&M Bldg. MS 3146, College Station, TX 77843, United States
AU: Auvermann, B W
EM: b-auvermann@tamu.edu
AF: Texas Agricultural Experiment Station, 6500 Amarillo Blvd. West, Amarillo, TX 79106, United States
AU: Littleton, R
EM: rickl@mic.tamu.edu
AF: Microscopy and Imaging Center, Biological Sciences Bldg. West MS 2257, College Station, TX 77843, United States
AB: Agricultural fugitive dust is a significant source of localized air pollution in the semi-arid southern Great Plains. In the Texas Panhandle, daily episodes of ground-level fugitive dust emissions from the cattle feedlots are routinely observed in conjunction with increased cattle activity in the late afternoons and early evenings. We conducted a field study to characterize size-selected agricultural aerosols with respect to hygroscopic, morphological, and chemical properties and to attempt to identify any correlations between these properties. To explore the hygroscopic nature of agricultural particles, we have collected size-resolved aerosol samples using a cascade impactor system at a cattle feedlot in the Texas Panhandle and have used the Environmental Scanning Electron Microscope (ESEM) to determine the water uptake by individual particles in those samples as a function of relative humidity. To characterize the size distribution of agricultural aerosols as a function of time, A GRIMM aerosol spectrometer and Sequential Mobility Particle Sizer and Counter (SMPS) measurements were simultaneously performed in an overall size range of 11 nm to 20 µm diameters at a cattle feedlot. Complementary determination of the elemental composition of individual particles was performed using Energy Dispersive X-ray Spectroscopy (EDS). In addition to the EDS analysis, an ammonia scrubber was used to collect ammonia and ammonium in the gas and particulate phases, respectively. The concentration of these species was quantified offline via UV spectrophotometry at 640 nanometers. The results of this study will provide important particulate emission data from a feedyard, needed to improve our understanding of the role of agricultural particulates in local and regional air quality.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0320 Cloud physics and chemistry
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0402 Agricultural systems
DE: 3311 Clouds and aerosols
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting