HR: 11:35h
AN: A42B-05    [Abstracts]
TI: Atmospheric Analysis by FT-IR: Ground-Based Solar Absorption Spectroscopy and Open-Path Techniques
AU: * Steill, J
EM: jsteill@utk.edu
AF: The University of Tennessee, Department of Chemistry, 552 Beuhler Hall The University of Tennessee, Knoxville, TN 37996-1600 United States
AU: Hager, S
EM: shager@utk.edu
AF: The University of Tennessee, Department of Physics, 401 Nielsen Physics Building The University of Tennessee, Knoxville, TN 37926-1200 United States
AU: Compton, R
EM: compton@ion.chem.utk.edu
AF: The University of Tennessee, Department of Chemistry, 552 Beuhler Hall The University of Tennessee, Knoxville, TN 37996-1600 United States
AU: Compton, R
EM: compton@ion.chem.utk.edu
AF: The University of Tennessee, Department of Physics, 401 Nielsen Physics Building The University of Tennessee, Knoxville, TN 37926-1200 United States
AU: Blass, W
EM: blass@phys.utk.edu
AF: The University of Tennessee, Department of Physics, 401 Nielsen Physics Building The University of Tennessee, Knoxville, TN 37926-1200 United States
AB: Knoxville and East Tennessee air-quality is notable disrepute. The high quantity of pollutants in the local air, especially ozone, is of great concern, particularly as regards the nearby Great Smoky Mountains National Park. A Bomem DA8 FT-IR is used to acquire infrared absorption spectra of the atmosphere. Integration of the absorption spectrometer with various optical systems provides a unique opportunity to analyze the local atmospheric chemical composition. This is done by directing solar radiation into the FT-IR with the use of a sun-tracking system, and also by directing light from the lab and back along a path through open air. Many trace atmospheric constituents are open to this analysis. Vertical concentration profiles of nitrous oxide are determined by fitting solar absorbance lines with SFIT2. Improved fitting of solar spectra has been demonstrated by incorporating the tropospheric nitrous oxide concentration as determined by open-path measurements. Since it is of special interest, tropospheric ozone production and analysis will also be discussed. Seasonal and daily trends of troposheric ozone abundance show correlation with other sources such as the EPA, and recent efforts to correlate solar spectra with open-path spectra will be discussed.
DE: 0345 Pollution--urban and regional (0305)
DE: 0360 Transmission and scattering of radiation
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting