GasParticle Interactions Working Group Summary

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Gas-Particle InteractionsWorking Group Summary
Rahul Zaveri Pacific Northwest National Laboratory

• Atmospheric Science Program Annual Meeting
• Alexandria, VA
• November 1, 2005

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Attendees Affiliation

• Michael Alexander Pacific Northwest National
  Laboratory
• Paul Davidovits Boston College
• Mike Ezell University of California at Irvine
• Barbara Finlayson-Pitts University of California
  at Irvine
• Mary Gilles Lawrence Berkeley Laboratory
• Jose Jimenez University of Colorado, Boulder
• Larry Kleinman Brookhaven National Laboratory
• Chuck Kolb Aerodyne Research, Inc.
• Alex Laskin Pacific Northwest National
  Laboratory
• Sasha Madronich NCAR
• Luisa Molina University of California at San
  Diego
• Jay Slowik Boston College
• Stephen Springston Brookhaven National Laboratory
• Judy Weinstein-Lloyd SUNY Old Westbury
• Rahul Zaveri, Chair Pacific Northwest National
  Laboratory
• Paul Ziemann University of California, Riverside

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Laboratory and Field Measurements Useful for
Developing, Constraining, and Evaluating Models

• Characterization of secondary organic aerosol
  precursors, formation,
• and processing
• Field measurements of SOA and other species using
  AMS. Jimenez
• Field measurements of secondary organic aerosols
  (SOA) and their precursors using the PTR-MS and
  AMS. Alexander
• Rate constants of reactions of key oxidants with
  various particulate organic compounds, and their
  effects on hygroscopicity, CCN activity, and
  volatilization of reacted particles. Ziemann
• Characterization of laboratory and field
  collected organic particles to produce
  structure-physical (hygroscopic and optical)
  properties relationships for SOA and nitrate
  particles. Finlayson-Pitts
• Field measurements of chemical content of SOA,
  its precursors, and oxidants using DOAS, Aerodyne
  Mobile Laboratory, and a suite of other
  ground-based instruments. Molina, Kolb
• Field measurements of SOA with the G-1 Kleinman,
  Berkowitz/Zaveri
• Data sets from aircraft flights during ASP field
  campaigns of core chemical and aerosol
  properties. Springston, Lloyd, Hubbe

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Laboratory and Field Measurements Useful for
Developing, Constraining, and Evaluating Models

• Characterization and aging of black carbon (BC),
  mineral, and other
• ambient particles
• Characterization of BC particles with near-edge
  x-ray absorption spectra for BC surrogates,
  atmospheric particles containing soot/BC, and
  samples that do not contain BC and determine if
  x-ray microscopy imaging can be used to quantify
  the mixing state of BC particles. Gilles
• Chemical, hygroscopic, and morphological
  characterization of bulk and individual particles
  (laboratory and field samples) containing BC,
  minerals, and other components using a variety of
  microscopic and spectroscopic techniques.
  Laskin
• Physical and chemical properties of BC particles
  subjected to surface oxidation and coating with
  organic and inorganic species. Davidovits

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Model Development, Improvement and Evaluation

• Development and evaluation of improved process
  models using
• laboratory and field measurements
• Fully-explicit mechanisms for secondary organic
  aerosol (SOA) formation along with a repository
  of measured and estimated kinetic, mechanistic,
  thermodynamic, and spectroscopic data.
  Madronich
• Comprehensive SOA representation in MOSAIC
  aerosol module and evaluation using laboratory
  and field measurements Madronich, Zaveri
• Size- and composition-resolved gas-aerosol
  Lagrangian box-model incorporating laboratory
  findings on SOA formation, BC aging, and
  heterogeneous chemistry Zaveri

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Path Forward

• Model development and evaluation will require
  close collaboration
• between modelers and experimentalists (lab and
  field).
• Need to integrate laboratory findings into
  models.
• Need to interface with other working groups
  better.
• Time-resolved Lagrangian G-1 flights are needed
  in MAX-Mex and MAX-Tex for constraining and
  evaluating gas-particle process models of aerosol
  formation, evolution, and aging.
• Ground measurements at T0, T1, T2 in MAX-Mex will
  be also useful for evaluating aerosol evolution
  and aging processes.
• Propose a workshop on SOA measurements and
  modeling sometime late 2006?