||Spatiotemporal Variability of Non-Urban Ozone Concentrations Over the Eastern United States and Its Potential Replication by Satellite Data.
Eder, B. K. ;
LeDuc, S. K. ;
Truppi, L. E. ;
||Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div.
United States ;
Air pollution monitoring ;
Rural areas ;
Suburban areas ;
Remote sensing ;
Spatial distribution ;
Time series analysis ;
Eastern Region(United States) ;
RPCA(Rotated Principal Component Analysis) ;
Surface ozone concentration
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||The spatial and temporal variability of the maximum 24 hourly surface ozone concentrations over the eastern United States was examined for the period 1985-1990 using Rotated Principal Component Analysis (RPCA). This led to the delineation of six contiguous subregions, each of which displayed statistically unique ozone characteristics. Examination of the time series associated with the Subregions revealed that the Great Lakes and Mid-Atlantic Subregions tend to contain a stronger seasonal cycle, with maximum concentrations occurring during the last week in June and the first week in July, respectively. The strength of this seasonality is weakened for the Northeast and South Subregions and the timing of its maximum delayed, until the end of July and the first of August, respectively. The Southwest Subregion experiences a greatly diminished seasonality, with maximum concentrations delayed until the middle of August. The seasonality found in the Florida Subregion is unique in both its strength and timing, as the highest concentrations consistently occur during the months of April and May. The time series were then deseasonalized and autocorrelations and spectral density estimates calculated, revealing that persistence is much more prevalent in the Florida, South and Southwest Subregions and less prevalent in the Northeast, Great Lakes and Mid-Atlantic Subregions.
||Presented at the Air and Waste Management Association (AWMA) Symposium, Scottsdale, AZ., January 26-28, 1993. Prepared in cooperation with National Oceanic and Atmospheric Administration, Research Triangle Park, NC. Atmospheric Sciences Modeling Div.
||68A; 48C; 43F
||PC A03/MF A01