EAS 4480 Data Analysis James Hite Project Description Motivation Census Growth Monitoring Sites 5 Sdekalb Yorkville Bledsoe Douglasville Conyers O 3 CO NO x ID: 675873
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Slide1
Investigating Atlanta Area Pollutant Trends
EAS 4480 – Data Analysis
James HiteSlide2
Project Description
Motivation: Census Growth
Monitoring Sites (5)
Sdekalb
, YorkvilleBledsoe,Douglasville, ConyersO3, 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)Slide3
Trends in 1-hour averages
Initial
Results
Overall Negative Trends - in line with VOC study
Interesting pointsFull positive: Conyers, Sdklb O300-10: none/negativeMotivation for reanalysis (averaging) –diurnal cycleMethod=======LS Regression, Bootstrap resampling to determine 95% normal confidence intervalSlide4
Example: Conyers O3Slide5
Trends in Daily/Monthly Avgs
.
Overall: increase in negative slopes
Daily: Most retained negative trends except
Full&00-10 Conyers O3 – no trendNeg/none: Douglasville O3; pos/neg Sdekalb O3Monthly: Less noise less apparent trends(in addition) Sdekalb O3: no full trend (00-10 less)No-trends: Bledsoe O3, Sdkelab PMfine00-10 Yorkville O3 no trend (full still neg.)Slide6
Example Figures: Sdekalb
O
3
10-year loss: -7.20E-03
ppmv
(daily)
vs -6.77E-03
ppmv (monthlySlide7
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
BedsoleConyers
Douglasville
Sdekalb
Yorkville
Jan.
0.000539
no data
no data
no data
no data
Feb.
0.001458
0.000724371
no data
no data
no data
Mar.
0.000784
0.000445466
0.000697919
0.000455
0.000549
Apr
0.0003
0.000570481
0.000572493
2.65E-05
0.000388
May
-0.00054
-0.000167528
-0.000340723
-0.00044
-0.00057
Jun
-8.43E-05
0.000590219
7.82E-05
-0.00032
-0.00039
Jul
-3.79E-05
-0.000521273
-0.000813447
-0.00113
-0.00087
Aug
-0.00066
-0.000965664
-0.000811305
-0.00126
-0.0008
Sep
9.63E-05
-5.76E-05
0.0005018
-0.00038
0.000118
Oct
-0.00044
-2.96E-05
0.000127452
-0.00038
-0.00018
Nov
0.000632
no data
no data
0.001812
-0.00134
Dec
0.000905
no data
no data
no data
no dataSlide8
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]Slide9
Rural v. Urban: Other Pollutants
Yorkville /
sdekalb
pollutants: all significant trends were negativePSD/CPSD AnalysisBedsole plot: (Lombscargle methodon 1-hr avgs)… took ~20 minutesSlide10
Example: NOxSlide11
Rural v. Urban
Separate
psd
analysis @ each station
Cpsd analysis & phase lagDaily Nox cpsd shows a shared weekly cycle with a lag of ~.5 day (yorksdekalb), would expect this since prevailing wind is easterly (coherence ~.7)Slide12
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. 20102009 Ambient Air Surveillance Report