NARSTO PM Assessment Chapter 5: Spatial and Temporal Pattern TOC Introduction Data Global Pattern NA

1
NARSTO PM AssessmentChapter 5 Spatial and
Temporal PatternTOC Introduction Data Global
Pattern NAM Dust NAM Smoke NAM Haze NAM Total
PM Local PM Speciated Seasonal Fine Mass over
the Eastern US

• The seasonal aerosol aerosol pattern at the
  IMPROVE sites is examined using two
  methodologies
• Seasonal Mass Balance Charts

2
Method 1 Cumulative Seasonal PM2.5 Composition

• 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 - 0.15Si 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.

Shenandoah
3
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

4
New England Chemical Mass Balance
Moosehorn
Acadia
Lye Brook
5
Mid-Atlantic Chemical Mass Balance
Washington DC
Brigantine
Shenandoah
Dolly Sods
Jefferson
6
Central EUS Chemical Mass Balance
Upper Buffalo
Mammoth Cave
Shining Rock
G.Smoky Mtn.
Sipsy
7
Peripheral Sites Chemical Mass Balance

• Eastern N. America is surrounded by aerosol
  source regions such as Sahara and Central
  America.
• As a consequence, the PM concentration at the
  edges ranges between 4-15 ug/m3 much of it
  originating outside.
• The chemical composition of the inflow varies by
  location and season.
• Sahara dust, and smoke from Central America and
  W. US/Canada are the main contributions.

Voyageurs (scale 0-15 ug/m3)
Acadia
Badlands (scale 0-15 ug/m3)
Big Bend (scale 0-15 ug/m3)
Everglades