Lead Presenter
Write Ups
In preparation for their presentations
on February 5, lead presenters have written abstracts describing their approach
to answering the questions they were assigned. Please click on the highlighted
hyperlink to pull up a Microsoft Word text of the abstract. Texts should be
submitted within the next few days, so keep checking back for latest postings.
IMPROVE OC/EC
Ratios
[Lead
presenter: Bill
Malm]
Where and when does the IMPROVE data base show high OC/EC ratios that
might indicate large contributions of secondary organic aerosol to light
extinction?
Question
Two [Lead
presenter:
Jim Pankow]
What organic particles should be included in the definition of secondary
organic aerosol? Condensation of
hot exhaust? Condensation of vapors
on particles in the atmosphere? Equilibrium
changes for volatile particles? Gas-phase
transformations? Aqueous-phase
transformations? Organic particle
reactions with inorganic gases?
Chemical
Mechanisms
[Lead
presenter:
Spyros
Pandis]
In non-technical terms, what are the chemical mechanisms that create
secondary organic aerosols, what are their precursors, what are the
environmental conditions needed to create and sustain particles, and what are
the organic substances in the particles?
Secondary vs. Primary Particles
[Lead
presenter:
Jamie Schauer]
Which gas and particle end-products can best distinguish secondary
organic aerosol from primary organic particles at receptor locations?
How stable are these components and how consistent are their ratios to
other components in the secondary organic aerosol “source profile?”
Measurement
Methods [Lead
presenter:
Barbara Zielinska]
What current sampling and measurement technologies are available to
measure these marker components? How
can these be practically applied at remote locations in pristine environments?
Note:
Only been able to quantify 10 – 20 percent. Secondary, because polar in nature
and are not easily measured. Methods are primitive. Question is getting practicality,
so how are we going to do this from remote areas. Artifacts questions is an
additional problem. Light itself scatters much of the stuff in the atmosphere.
Sources
of Precursors [Lead
presenter:
Richard Kamens]
What are the major sources of precursors for secondary organic aerosols? What are the types of vegetation, vehicle exhaust, and
burning and under what conditions?
Particles Affecting Light Extinction
[Lead
presenter:
Lynn Hildemann]
What are the size, composition, and hygroscopic properties of secondary
organic particles that are most likely to affect light extinction.
Which end-products and formation mechanisms are likely to cause the
largest and smallest effects on regional haze?
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