[Grad-postdoc-assn] Upcoming Seminar
Ethan Gutmann
Ethan.Gutmann at colorado.edu
Thu Nov 13 10:51:56 MST 2008
Hi All,
As Maura mentioned at today's research review, the next ASP seminar
will be held next Wednesday at 11AM in CG1 South Auditorium, see the
description below.
ethan
Atmospheric Chemistry After Dark
Steven S. Brown
Chemical Sciences Division
NOAA Earth System Research Laboratory
The primary drivers for atmospheric chemical transformation are
radical species and oxidants that are photochemical in origin, such as
ozone and OH. Nighttime chemical transformations, which are also
important in certain environments, often rely on photochemical energy
stored in the form of compounds such as ozone and can provide
significant feedbacks that affect daytime photochemical cycles.
Perhaps one of the most important classes of dark reactions are the
cycles involving the higher nitrogen oxides, NO3 and N2O5, which form
from the oxidation of NO2 by O3 at night. These compounds are
unstable in sunlight, but can build to appreciable concentrations in
the dark. Recent advances in measurement technology have allowed new
investigations into the role of these compounds in the atmosphere.
This talk will explore new findings on several aspects of this dark
chemistry that is relevant in the troposphere, including heterogeneous
conversion of NOx to soluble nitrate, nocturnal generation of
photochemically active halogen species and oxidation of biogenic
hydrocarbons.
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