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The seasonal aerosol aerosol pattern at the IMPROVE sites is examined using two methodologies:

NARSTO PM Assessment Chapter 5: Spatial and Temporal Pattern TOC Introduction Data Global Pattern NAM Dust NAM Smoke NAM Haze NAM Total PM Local PM Speciated Seasonal over the Central EUS. The seasonal aerosol aerosol pattern at the IMPROVE sites is examined using two methodologies:

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The seasonal aerosol aerosol pattern at the IMPROVE sites is examined using two methodologies:

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  1. NARSTO PM AssessmentChapter 5: Spatial and Temporal PatternTOCIntroductionDataGlobal PatternNAM DustNAM Smoke NAM Haze NAM Total PM Local PM Speciated Seasonal over the Central EUS The seasonal aerosol aerosol pattern at the IMPROVE sites is examined using two methodologies: Seasonal Mass Balance Charts Seasonal Percentile Frequency Charts

  2. Method 1: Cumulative Seasonal PM2.5 Composition Shenandoah • PM2.5 chemical components were calculated based on the CIRA methodology • In addition, the the organics were (tentatively) further separated as Primary Smoke Organics (red) and Remainder organics (purple) PSO = 20*(K - 0.15*Si – 0.02* Na) Remainder Org = Organics - PSO • Also, the ‘Unknown’ mass (white area) is the difference between the gravimetrically measured and the chemically reconstructed PM2.5. • The daily chemical composition was aggregated over the available IMPROVE data range (1988-99) to retain the seasonal structure. • I order to reduce the noise the daily data were smoothed by a 15-day moving average filter.

  3. Method 2: Seasonal Percentiles, 1992-99 • The charts depict the magnitude of seasonal and synoptic variation • The synoptic-scalevariation (day-to-day) can be measured by the 20-80 percentile spread Great Smoky Mtn. Lye Brook At Lye Brook, VT, the clean days (20 percentile) corresponds to ~4 ug/m3 throughout the year The dirty days are (80-90%-ile) have 2-5 times higher concentration than the clean days. Dirty days, 80-90% Dirty days, 80-90% ‘Clean’ days (20%) Clean days (20%) At the Smoky Mtn, the clean days in the winter are also ~4 ug/m3. However in the summer, even the ‘clean’ days have 14 ug/m3 PM2.5. The dirty days are have 2-3 times higher than the clean days through out the year.

  4. Regional Grouping of Sites • For this presentation the IMPROVE sites were grouped as follows: • New England () • Mid-Atlantic () • Central EUS () • Peripheral () • For each region, the seasonality is displayed for: • Chemical Mass Balance • Carbonaceous Mass Balance • Fine Particle Mass Percentiles • Coarse Mass Percentiles • Sulfate Percentiles • Fine Soil Percentiles • Tot. Carbon. + 'Unknown' Percentiles • Smoke Organics Percentiles

  5. Central EUS: Chemical Mass Balance UpperBuffalo Mammoth Cave Shining Rock G.Smoky Mtn. Sipsy

  6. Central EUS: Carbonaceous Mass Balance UpperBuffalo Mammoth Cave Shining Rock G.Smoky Mtn. Sipsy

  7. Central EUS: Fine Particle Mass Percentiles UpperBuffalo Mammoth Cave Shining Rock G.Smoky Mtn. Sipsy

  8. Central EUS: Coarse Mass Percentiles UpperBuffalo Mammoth Cave Shining Rock • Coarse mass G.Smoky Mtn. Sipsy

  9. Central EUS: Sulfate Percentiles UpperBuffalo Mammoth Cave Shining Rock • Non-sea salt sulfate G.Smoky Mtn. Sipsy

  10. Central EUS: Fine Soil Percentiles UpperBuffalo Mammoth Cave Shining Rock • Fine dust G.Smoky Mtn. Sipsy

  11. Central EUS: Tot. Carbon + 'Unknown' Percentiles UpperBuffalo Mammoth Cave Shining Rock • Carbonaceous G.Smoky Mtn. Sipsy

  12. Central EUS: Smoke Organics Percentiles UpperBuffalo Mammoth Cave Shining Rock • Smoke organics G.Smoky Mtn. Sipsy

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