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Microscale Air Dispersion Modeling Status Community Health Neighborhood Assessment Program Working Draft March 28, 2001 Three Types of Inventory Area-Wide Sources (e.g. consumer products) Motor Vehicle (e.g. freeway) Point Source Traditional Points (e.g. NASCO)

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microscale air dispersion modeling status community health neighborhood assessment program

Microscale Air Dispersion Modeling StatusCommunity HealthNeighborhood Assessment Program

Working Draft

March 28, 2001

three types of inventory
Three Types of Inventory
  • Area-Wide Sources (e.g. consumer products)
  • Motor Vehicle (e.g. freeway)
  • Point Source
    • Traditional Points (e.g. NASCO)
    • Includes Some “Area-Wide” Sources (e.g. auto repair)
models for microscale
Models for Microscale
  • ISCST3
    • Traditional workhorse model
  • AERMOD
    • Latest USEPA model for microscale
  • Calpuff
    • 3 dimensional wind field
  • CALINE
    • EPA line source model
  • Lagrangian Particle Dispersion Model
    • New emerging model
some facts
Some Facts
  • 600+ Individual Point Sources
  • 64 Individual Pollutants
  • Diurnal Variation of Emissions
  • Meteorological Data from Memorial Jr High
    • November 1999 thru October 2000
  • Coarse Grid Receptor Field (500 m grid spacing)
  • Fine Grid Receptor Field (50m-100m grid spacing)
iscst3 results
ISCST3 Results
  • Preliminary
    • Formaldehyde
    • Cr(VI)
  • Point Sources Only
aermod results
AERMOD Results
  • Preliminary
    • Formaldehyde
    • Cr(VI)
  • Point Sources Only
cal3qhc results
CAL3QHC Results
  • Preliminary
    • Benzene
    • Diesel Exhaust PM
  • Motor Vehicle Only
calpuff modeling system
CALPUFF Modeling System
  • CALMET
    • Multiple sources of meteorological data
    • 3-dimensional wind field
  • CALPUFF
    • non-steady state modeling (i,e., puff model)
calpuff non steady state puffs an example next two slides
CALPUFF Non-steady State Puffs(An Example - Next Two Slides)
  • November 11, 1999
  • Mn emissions terminate after the 4pm hour
  • For the 5pm hour
    • AERMOD and ISC
      • show zero concentration
    • CALPUFF
      • shows non-zero concentration
      • emission puff still in domain
microscale follow up work
Microscale Follow Up Work
  • Sensitivity studies (e.g., receptor field, source configuration)
  • Overlay concentration fields from line sources and point sources
  • Update inventory based on modeling results (iterative procedure)
  • Continue with CALPUFF analysis
  • Evaluate Model Performance