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cases. These include `traditional’ secondary organic
aerosol formation experiments (including temperature
effects), emissions characterization via dilution sampling,
parcel mixing, and finally gas- and condensed-phase
chemistry. We will discuss the relationships among
various partitioning treatments (i.e., the VBS, Odum
`2-product’ models, explicit mechanisms, etc.) as well
as various mechanisms treating photochemical aging of
organic aerosol. Wall effects in chamber experiments will
be given special consideration as an example problem.
Neil Donahue is the director of the Center for Atmospheric
Particle Studies at Carnegie Mellon University. He is
a professor of chemistry, chemical engineering, and
engineering and public policy with broad research
interests relating to all aspects of organic compounds
in the atmosphere. In more than 100 peer-reviewed
publications he has addressed questions ranging from
non-methane hydrocarbon modeling and measurement
in the remote marine atmosphere to laboratory kinetics
of condensed-phase organic compounds. Professor
Donahue has been at Carnegie Mellon since 2000. He
received a PhD in meteorology from MIT (1991) before
pursuing postdoctoral work in physical chemistry at
Harvard University under the supervision of Jim Anderson.
14. MeASureMenTS of CArBon In The
ATMoSphere
Christopher D. Cappa, Department of Civil
and Environmental Engineering, University of
California, Davis, CA
Abstract: Carbon makes up a large fraction of
atmospheric aerosols. Aerosol carbon is commonly
sub-divided into two general types: organic carbon
and elemental (aka black) carbon. There are numerous
methods for the measurement of these two types of
aerosol carbon. In this tutorial, an overview of many of
the available methods for the measurement of particulate
carbon will be given. Basic operating principles will be
presented, and the methods will be considered in terms of
quantitativeness, information content, time resolution, size
resolution, ease of use and sensitivity. The discussion will
be focused around methods and instrumentation that can
be used for the measurement of organic carbon, elemental
(black) carbon or both.
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