HR: 1340h
AN: A53C-1362    [Abstracts]
TI: Trends, Distribution and Frequency Analyses of Ozone Data From Three Monitoring Stations in Baton Rouge, Louisiana for the Years 1995 to 2005
AU: * Klasinc, L
EM: klasinc@irb.hr
AF: Rudjer Boskovic Institute, Bijenicka 54, Zagreb, 10000, Croatia (local name: Hrvatska)
AU: Kezele, N
EM: kezele@irb.hr
AF: Rudjer Boskovic Institute, Bijenicka 54, Zagreb, 10000, Croatia (local name: Hrvatska)
AU: Pompe, M
EM: matevz.pompe@guest.arnes.si
AF: Fakulteta za Kemijo in Kemijsko Tehnologijo, University of Ljubljana, Askerceva 5, Ljubljana, 1000, Slovenia
AU: McGlynn, S
EM: chspm@lsu.edu
AF: 2 Department of Chemistry, The Louisiana State University, Choppin Hall, Baton Rouge, LA 70803, United States
AB: Troposphere ozone concentrations exhibit pronounced, characteristic diurnal and seasonal cycles. These cycles are usually well-defined. However, additional oscillations can also occur; these are generally much smaller in amplitude than the 1-day or 1-year cycles and they might be attributable to anthropogenic influences (e.g., specific man-induced meteorological and chemical influences on an individual monitoring station, periodic maintenance activities, etc). Indeed, it is possible that the spectral analysis of photochemical pollution data could pinpoint hidden conditions that affect particular monitoring stations. Such an analysis, one based on Fourier transform methods, was applied to long-term data from 3 American monitoring stations. As would be expected, strong signals were found for the 1-day and 1-year periods; however, some weaker signals, ones probably associable with anthropogenic affairs, were also observed. A principal component analysis (PCA) was applied to the transformed data sets in order to identify these periods and make pollution ranking. Periods of 0.5, 3.5-days and 7-days, as well as a number of other cycles, were found and can be considered to be markers of anthropogenic influences. European and American data will be compared and the effects of Hurricane Katrina will be examined.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting