1. Joe Adlhoch - Air Resource Specialists, Inc.
Ambient Monitoring Data Summary: Carbon WRAP Workshop on Fire, Carbon, and Dust May 23, 2006
Joe Adlhoch - Air Resource Specialists, Inc.

2. Outline
Baseline (2000 – 2004) IMPROVE aerosol extinction budgets for the 20% worst and best visibility days
Spatial and temporal variations of particulate organic material (POM or OMC) and elemental carbon (EC)
Long-term trends in POM and EC

3. IMPROVE Monitoring Locations

4. Baseline Extinction: 20% Worst Days

5. Baseline Extinction: 20% Best Days

6. Spatial and Temporal Patterns in Carbon
Data shown for 2002 and 2004
20% worst visibility days
2002 and 2004 show similar patterns for carbon
EC patterns similar to POM; possible urban influence in southern California?
Quarterly summaries, all days included
Significant seasonal/annual differences
Note scaling differences on maps!

7. POM Extinction for 20% Worst Visibility Days, 2002 and 2004

8. EC Extinction for 20% Worst Visibility Days, 2002 and 2004

9. Quarterly POM Extinction (Mm-1), 2002
2002 hot spots and maximum values vary by quarter
Impact from Biscuit Fire in quarter 3 is the most significant event in 2002 16 31 83 31

10. Quarterly EC Extinction (Mm-1), 2002
2002 quarterly pattern for EC similar to that of POM 5 6 18 6

11. Quarterly POM Extinction (Mm-1), 2004
2004 pattern of POM different than in 2002
2004 POM levels lower than in 2002 except for northern California fire in quarter 2 16 49 29 18

12. Quarterly EC Extinction (Mm-1), 200411 4
2004 quarterly pattern for EC similar to that of POM 6 6

13. Quarterly POM Extinction Fraction, 2002
2002 quarterly POM extinction fractions ranges from ~10 – 60% 44 42 61 53

14. Quarterly POM Extinction Fraction, 200450 43
2004 quarterly POM extinction fractions somewhat similar to 2002 values 62 48

15. Quarterly EC Extinction Fraction, 200218 12
2002 quarterly EC extinction fractions ranges from ~5 – 20%
Less seasonal dependence than POM 15 18

16. Quarterly EC Extinction Fraction, 200422 12
2004 quarterly EC extinction fractions ranges from ~5 – 20%
Less seasonal dependence than POM 14 19

17. Historical Trends in 20% Worst Days: Total and POM Extinction
16 year trends (1989 – 2004) required 12 complete years of data
8 year trends (1997 – 2004) required 6 complete years of data
Theil slopes (Mm-1/yr) calculated for all sites with sufficient data
P-values of 0.2 required to identify trend as significant
Changes in monitoring or analytical protocol over the years may affect trends

18. Trend Observations
Generally not much correlation between total extinction and carbon extinction trends
Many sites show no significant trend for carbon
Where POM trends are significant, POM extinction often shows an upward trend
Where EC trends are significant, EC extinction often shows a downward trend

19. Layout of Trend Maps 16-yr Total Extinction Trends
16-yr POM or EC Extinction Trends
8-yr POM or EC Extinction Trends