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Exploration of PM networks and data over the US: AQS and VIEWS
Presented at CAPITA group seminar, 2011-04-21
Li Du and Ratish Menon
CAPITA, St Louis 1/21
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Conceptual framework of aerosol characterization
2http://datafedwiki.wustl.edu/index.php/2011-01-12:_The_conceptual_framework_of_aerosol_characterization
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Coverage of datasets
Continuous monitoring
VIEWS aerosol chemistry
EPA FRM PM25
EPA FRM PM10
Data count per station Station count time series
6 day
3 day1 day
6 day 3 day
1 day
3
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Datafed browser user interface
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Data processing scheme
Raw data
Select spatial and temporal coverage
Aggregates data from all the stations in the selected spatial coverage
Spatially aggregated data is aggregated over time range
Moving window smoothing operator for spatially and temporally aggregated data 5
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95th percentile
84th percentile
average
50th percentile
16th percentile
Distribution function
Big Bend National Park, TX
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Sub-region division of contiguous US
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Time trend of PM in two different subregions
PM10 PM25 8
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30
0
E5
E
50
0
38
E=95th Percentile/50th Percentile
Episodicity identification
9
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Spatial variation coefficient of variation average average
Temporal variation average average coefficient of variation
Assessment of spatial and temporal variation
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Spatial variation Temporal variation
Dust Dust
Sulfate Sulfate
Spatial and temporal variation – Industrial Midwest
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Beta attenuation
TEOM
Nephelometer
FDMS
AQS_H data network assessment classified by types of instrument
13Data count per station Station count time series
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PM25 Correlation: Continuous monitoring and EPA FRM
Industrial Midwest
14
EPA FRM PM25
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Spring
Fall
Summer
Winter
Industrial Midwest seasonal correlations
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Industrial Midwest (winter season)
Urban Rural Suburban
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Rural
Suburban
Urban
Beta Attenuation
Beta Attenuation
Beta Attenuation
TEOM
TEOM
TEOM
FDMS
FDMS
Industrial MidwestWinter season
17
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PM25 Correlation: Continuous monitoring and EPA FRM
Northwest
Overall
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EPA FRM PM25
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Spring
Fall
Summer
Winter
Northwest seasonal correlations
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Urban Rural Suburban
Northwest (spring season)
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Rural
Suburban
Urban
Beta Attenuation
TEOM Nephelometer
Beta Attenuation
Beta Attenuation
TEOM
TEOM
Nephelometer
Nephelometer
Northwestspring season
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