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

Conceptual framework of aerosol characterization

2http://datafedwiki.wustl.edu/index.php/2011-01-12:_The_conceptual_framework_of_aerosol_characterization

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

Datafed browser user interface

4

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

95th percentile

84th percentile

average

50th percentile

16th percentile

Distribution function

Big Bend National Park, TX

6

Sub-region division of contiguous US

7

Time trend of PM in two different subregions

PM10 PM25 8

30

0

E5

E

50

0

38

E=95th Percentile/50th Percentile

Episodicity identification

9

10

Spatial variation coefficient of variation average average

Temporal variation average average coefficient of variation

Assessment of spatial and temporal variation

11

Spatial variation Temporal variation

Dust Dust

Sulfate Sulfate

Spatial and temporal variation – Industrial Midwest

12

Beta attenuation

TEOM

Nephelometer

FDMS

AQS_H data network assessment classified by types of instrument

13Data count per station Station count time series

PM25 Correlation: Continuous monitoring and EPA FRM

Industrial Midwest

14

EPA FRM PM25

Spring

Fall

Summer

Winter

Industrial Midwest seasonal correlations

15

Industrial Midwest (winter season)

Urban Rural Suburban

16

Rural

Suburban

Urban

Beta Attenuation

Beta Attenuation

Beta Attenuation

TEOM

TEOM

TEOM

FDMS

FDMS

Industrial MidwestWinter season

17

PM25 Correlation: Continuous monitoring and EPA FRM

Northwest

Overall

18

EPA FRM PM25

Spring

Fall

Summer

Winter

Northwest seasonal correlations

19

Urban Rural Suburban

Northwest (spring season)

20

Rural

Suburban

Urban

Beta Attenuation

TEOM Nephelometer

Beta Attenuation

Beta Attenuation

TEOM

TEOM

Nephelometer

Nephelometer

Northwestspring season

21