Meteorological Effects on Morning Rush Hour Air Pollution
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Transcript of Meteorological Effects on Morning Rush Hour Air Pollution
Meteorological Effects on Morning Rush Hour Air
PollutionChris Forehand
Atlanta Commuter Exposure (ACE) Project
BackgroundWhat is the ACE project?
Funded by the CDC Joint project between Emory University and GatechUses continuous and time integrated
measurementWhy is it important?
High exposure concentrations on a daily basis
Methodology
For this class…Examine the effects of:
Seasonal TrendsTemperatureRelative HumidityWind SpeedPrecipitation
Limitations:Mobile measurementsLimited meteorological dataNon-continuous observations
Seasonal TrendsEC (ug/m3) BC (ug/m3) OC (ug/m3)
Fall 2.209972693 5.351207711 20.97853547Winter 1.370976827 5.327759696 13.91420033Spring 2.260973924 7.706329281 14.18891958Summer 5.018534266 9.479550192 21.95192238
10/14/09 1/22/10 5/2/10 8/10/10 11/18/10 2/26/11 6/6/11 9/14/11 -
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Date
Blac
k Ca
rbon
[]
(ug/
m3)
Event AnalysisMoving Average
Temperature
30 40 50 60 70 80 900
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4
6
8
10
12
14
16
R² = 0.0227212196358578
Temperature (F)
Blac
k Ca
rbon
[]
(ug/
m3)
Relative Humidity
60 65 70 75 80 85 90 95 1000
2
4
6
8
10
12
14
16
R² = 0.0421006480027978
Relative Humidity (%)
Blac
k Ca
rbon
[]
(ug/
m3)
Precipitation Events
Wind Speed
0 1 2 3 4 5 6 7 8 9 10 11 12 1302468
10121416
R² = 0.150167151765542
Wind Speed (mph)
Blac
k Ca
rbon
[]
(ug/
m3)
3 4 5 6 7 8 9 10 11 12 130
2
4
6
8
10
12
14
R² = 0.190981189697818
Wind Speed (mph)
Blac
k Ca
rbon
[]
(ug/
m3)
Wind Speed (cont.)
0 1 2 3 4 5 6 7 8 9 100
2
4
6
8
10
12
14
16
R² = 0.496978024423337
Wind Speed (mph)
Blac
k Ca
rbon
[] (u
g/m
3)
Conclusions Seasonal Variation
Too much scatter and too few points to be very conclusive Pollution seems to dominate in summer, contrary to ABL expectations
Temperature Seems to be very loosely correlated
Relative Humidity Little correlation for fresh source particulates
Wind Speed Limited Data Mild Correlation
Precipitation Observable trends
AcknowledgementsJeremy Sarnat & Roby Greenwald
Emory University, Rollins School of Public HealthMike Bergin
Georgia Institute of TechnologyMartin Shafer
University of WisconsinPriya Kewada, James Gooch, Kyle Manning, and
everyone else on the ACE / SCAPE team!