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Ambient Monitoring Data Summary: Carbon WRAP Workshop on Fire, Carbon, and Dust May 23, 2006

This report covers the baseline data, spatial variations, and long-term trends of particulate organic material (POM), elemental carbon (EC), and dust, focusing on the 20% worst visibility days. Detailed trends and patterns are analyzed across different monitoring locations.

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Ambient Monitoring Data Summary: Carbon WRAP Workshop on Fire, Carbon, and Dust May 23, 2006

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  1. Ambient Monitoring Data Summary:Carbon WRAP Workshop on Fire, Carbon, and DustMay 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 31 83

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

  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 18 29

  12. Quarterly EC Extinction (Mm-1), 2004 11 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 53 61

  14. Quarterly POM Extinction Fraction, 2004 50 43 • 2004 quarterly POM extinction fractions somewhat similar to 2002 values 48 62

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

  16. Quarterly EC Extinction Fraction, 2004 22 12 • 2004 quarterly EC extinction fractions ranges from ~5 – 20% • Less seasonal dependence than POM 19 14

  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 8-yr Total Extinction Trends 16-yr POM or EC Extinction Trends 8-yr POM or EC Extinction Trends

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