investigating atlanta area pollutant trends
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Investigating Atlanta Area Pollutant Trends
EAS 4480 – Data AnalysisJames Hite
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 ChangeDeKalb: (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)
Trends in 1-hour averages
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
Method=======LS Regression, Bootstrap resampling to determine 95% normal confidence interval
Example: Conyers O3
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/neg
Sdekalb O3 Monthly: Less noise less apparent
trends (in addition) Sdekalb O3: no full trend
(00-10 less) No-trends: Bledsoe O3, Sdkelab PMfine 00-10 Yorkville O3 no trend (full still
neg.)
Example Figures: Sdekalb O3
10-year loss: -7.20E-03 ppmv (daily) vs -6.77E-03 ppmv (monthly
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. (-) Trends in Individual Monthly Averages: Ozone Slopes: ppmv/year
Month Bedsole Conyers Douglasville Sdekalb YorkvilleJan. 0.000539 no data no data no data no dataFeb. 0.001458 0.000724371 no data no data no dataMar. 0.000784 0.000445466 0.000697919 0.000455 0.000549Apr 0.0003 0.000570481 0.000572493 2.65E-05 0.000388May -0.00054 -0.000167528 -0.000340723 -0.00044 -0.00057Jun -8.43E-05 0.000590219 7.82E-05 -0.00032 -0.00039Jul -3.79E-05 -0.000521273 -0.000813447 -0.00113 -0.00087Aug -0.00066 -0.000965664 -0.000811305 -0.00126 -0.0008Sep 9.63E-05 -5.76E-05 0.0005018 -0.00038 0.000118Oct -0.00044 -2.96E-05 0.000127452 -0.00038 -0.00018Nov 0.000632 no data no data 0.001812 -0.00134Dec 0.000905 no data no data no data no data
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 intervalInteresting: less urban areas have higher [March]
Rural v. Urban: Other Pollutants Yorkville / sdekalb pollutants: all significant
trends were negative PSD/CPSD Analysis
Bedsole plot: (Lombscargle method
on 1-hr avgs) … took ~20 minutes
Example: NOx
Rural v. Urban
Separate psd analysis @ each station
Cpsd analysis & phase lag Daily Nox cpsd shows a shared
weekly cycle with a lag of ~.5 day (yorksdekalb), would expect this since prevailing wind is easterly (coherence ~.7)
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