[Grad-postdoc-assn] Upcoming Seminar

[Ethan Gutmann]

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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