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AAAR 2009 AEROSOL NUCLEATION SYMPOSIUM
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American Aerosol Research Association (AAAR) 28th Annual Conference, Minneapolis, Minnesota, October 26 - 30, 2009
Symposium - Atmospheric aerosol nucleation and growth: molecular clusters to nanoparticles to climate
Chairs:
Shan-Hu Lee (slee19@kent.edu), Kent State University
Robert McGraw (rlm@bnl.gov), Brookhaven National Laboratory
Atmospheric aerosol nucleation controls the
number of new particles formed from gas phase
species and the growth of these small particles
may directly affect climate. Recent studies have
made substantial progress towards reducing large
discrepancies between atmospheric and laboratory
measurements and the modeling of these
important processes. These include: (1) Observations
of new particle formation made in a variety
of atmospheric environments including forests,
urban and remote areas and the free troposphere.
Some of these observations have been
accompanied by simultaneous measurements of
aerosol precursors and chemical speciation of
nanoparticles. (2) Laboratory studies under simulated
atmospheric conditions to help identify the key organic and inorganic chemical species that participate
in aerosol nucleation and growth and reduce uncertainties in the measurement of aerosol precursor
concentrations. (3) Development of parameterizations based on observation and suitable for use in regional
and global aerosol models to predict the effects of new particles on climate. (4) Significant advances
achieved in aerosol instrumentation in terms of measuring the chemical composition and size of molecular
clusters and small particles. We invite abstracts from various disciplines to discuss scientific findings of
aerosol nucleation and growth and to examine discrepancies between different studies, differences in interpretation,
and future directions in this highly exciting but demanding atmospheric aerosol science field.
Some important theme questions to discuss in this symposium include:
1. What is the relative importance of nucleation/new particle formation vs primary emissions as sources of particle number for cloud condensation nuclei?
2. In addition to sulfuric acid and water, what is the role of other atmospheric trace species such as ammonia, organics, and nitrogen compounds in new particle formation?
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