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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?