HR: 1340h
AN: A53A-0169    [Abstracts]
TI: Microphysical and Chemical Properties of Agricultural Aerosols
AU: * Brooks, S D
EM: sbrooks@ariel.met.tamu.edu
AF: Texas A&M University, Deptarment of Atmospheric Sciences 3150 TAMU College Station, TX 77843, College Station, TX 77843-3150 United States
AU: Moon, S
EM: naruki10@tamu.edu
AF: Texas A&M University, Deptarment of Atmospheric Sciences 3150 TAMU College Station, TX 77843, College Station, TX 77843-3150 United States
AU: Littleton, R
EM: rlittleton@tamu.edu
AF: Texas A&M University, Deptarment of Atmospheric Sciences 3150 TAMU College Station, TX 77843, College Station, TX 77843-3150 United States
AU: Auvermann, B
EM: b-auvermann@tamu.edu
AF: Texas Cooperatiove Extension, 6500 Amarillo Blvd. West, Amarillo, TX 79106 United States
AB: Due to significant atmospheric loadings of agricultural dust aerosols, the aerosol's ability to contribute significantly to climate forcing on a regional to global level has been a topic of recent interest. Efforts have been made to quantify both the aerosol extinction of the total aerosol population and the hygroscopic and chemical properties of individual particles at a cattle feedyard near Canyon, Texas. Measurements of aerosol extinction are made using open-path transmissometry. Our results show that extinction varies significantly with relative humidity. To further explore the hygroscopic nature of the particles, size-resolved aerosol samples are collected using a cascade impactor system (7 stages ranging from 0.6 micron to 16 micron diameter) and hygroscopicity measurements are conducted on these using an Environmental Scanning Electron Microscope (ESEM). Complimentary determination of the elemental composition of individual particles is performed using Energy Dispersive X-ray Spectroscopy. Results of the optical properties, hygroscopicity and chemical composition of aerosols will be presented and atmospheric implications discussed.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0320 Cloud physics and chemistry
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005