1 / 12

Investigating Atlanta Area Pollutant Trends

EAS 4480 – Data Analysis James Hite. Investigating Atlanta Area Pollutant Trends. Project Description. Motivation: Census Growth Monitoring Sites (5) Sdekalb , Yorkville Bledsoe, Douglasville , Conyers O 3 , CO , NO x , PM 2.5 Previous Study on VOCs. 2000-2010 Population Change

treva
Download Presentation

Investigating Atlanta Area Pollutant Trends

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. EAS 4480 – Data Analysis James Hite Investigating Atlanta Area Pollutant Trends

  2. Project Description • Motivation: Census Growth • Monitoring Sites (5) • Sdekalb, Yorkville • Bledsoe,Douglasville, Conyers • O3, CO, NOx, PM2.5 • Previous Study on VOCs 2000-2010 Population Change DeKalb: (43,737, 16.7%) Douglas: (16,847, 48.4%) Spaulding: (3,776, 16.4%) Rockdale: (8,190, 32.7%) Paulding: (22,856, 78.1%) Polk: -- (1,849, 14.6%) Haralson: -- (1,568, 12.3%) (expressed in housing units)

  3. Trends in 1-hour averages Method ======= LS Regression, Bootstrap resampling to determine 95% normal confidence interval • Initial Results • Overall Negative Trends - in line with VOC study • Interesting points • Full positive: Conyers, Sdklb O3 • 00-10: none/negative • Motivation for reanalysis (averaging) –diurnal cycle

  4. Example: Conyers O3

  5. Trends in Daily/Monthly Avgs. • Overall: increase in negative slopes • Daily: Most retained negative trends except • Full&00-10 Conyers O3 – no trend • Neg/none: Douglasville O3; pos/negSdekalb O3 • Monthly: Less noise  less apparent trends • (in addition) Sdekalb O3: no full trend (00-10 less) • No-trends: Bledsoe O3, SdkelabPMfine • 00-10 Yorkville O3  no trend (full still neg.)

  6. Example Figures: Sdekalb O3 10-year loss: -7.20E-03 ppmv (daily) vs-6.77E-03 ppmv (monthly

  7. Changes in Monthly O3 • Linear Trends identified across indv. months • Interesting results: • JFM, ND off-season (Bedsole): positive trends • (other stations don’t really measure at this time) • Conyers Apr. (+), Aug. (-) • Sdekalb Jul./Aug. (-)

  8. Example Figures • Mar., Nov. off-season (Bedsole): positive trends • Conyers : Aug. (-) • Sdekalb: Aug. (-) • Note: other sites have similar slopes, did not pass resampling test for 95% confidence interval • Interesting: less urban areas have higher [March]

  9. Rural v. Urban: Other Pollutants • Yorkville / sdekalbpollutants: all significant trends were negative • PSD/CPSD Analysis • Bedsole plot: • (Lombscargle methodon 1-hr avgs) • … took ~20 minutes

  10. Example: NOx

  11. Rural v. Urban • Separate psd analysis @ each station • Cpsd analysis & phase lag • Daily Noxcpsd shows a shared weekly cycle with a lag of ~.5 day (yorksdekalb), would expect this since prevailing wind is easterly (coherence ~.7)

  12. References • Data Source: http://georgiaair.org/amp/export.phpGeorgia Department of Natural Resources, Environmental Protection Division, Air Protection Branch Ambient Monitoring Program - Susan Zimmer-Dauphinee, Program Manager • Blanchard et. al. 2010 • 2009 Ambient Air Surveillance Report

More Related