SEMINAR: REMINDER: CIMAS Visiting Scientist Seminar - Dr. Song Gao - TODAY, 3:30 PM - SLAB

[Marva Loi <marva@rsmas.miami.edu>]

CIMAS
VISITING SCIENTIST SEMINAR

SONG GAO
Assistant Professor of Chemistry
Farquhar College of Arts & Sciences - MST
NOVA Southeastern University
Ft. Lauderdale, FL

?Organic Compounds in Atmospheric Aerosols:
Identity, Origin and Evolution?


Thursday, January 21, 2010, 3:30 PM

SLAB SEMINAR ROOM (SA103)
Science and Administration Building, RSMAS

ABSTRACT

Laboratory and field evidence suggests that organic
compounds comprise a substantial mass fraction of atmospheric aerosols. 
Yet commonly, less than 20% (in mass fraction) of the total organic
aerosol can be speciated into individual compounds, hindering our
abilities to full understand aerosols? climatic and health effects.  I
will be talking about some recent findings with regard to organic
aerosols from laboratory experiments, field measurements and noval
analytical speciation.  In simulation chambers, it is found that
high-molecular-weight species may comprise a substantial fraction of
organic aerosols, and some of these species are oligomeric in nature. 
Higher particle acidity apparently leads to more oligomer formation and
higher aerosol yield.  By using novel analytical instrumentation, new
classes of compounds have been identified in field samples, including
organosulfates, organonitrates, dehydrated sugars, and N-containing
organic salts.  These will be discussed using the results from
SAFARI-2000, ACE-Asia, a campaign in Southeastern US and latest
measurements in downtown Shanghai, China.  A fine balance needs to be
reached between continuing to uncover new classes of organic compounds
and identifying representative species and formation pathways in
atmospheric aerosols. 




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