Coupling Clouds and Chemistry

Mary Barth
National Center for Atmospheric Research
Boulder, CO 80307-3000
barthm@ucar.edu

Clouds can affect chemistry in many ways.  We learned from the Microphysics Parameterization discussion that the choice of which microphysics parameterization can influence dynamic and thermodynamic variables near storms.  Topics to be discussed during this talk include

1. the radiative effect of clouds,
2. aqueous chemistry,
3. the lightning source of NOx,
4. wet deposition of species, and
5. ice and chemistry
Questions that can be addressed are
What is the best method to parameterize a cloud's radiative effect on photolysis rates?  This question may be discussed more in the Radiation discussion.
Is aqueous chemistry a must for mesoscale chemistry models?
What scheme is best for estimating NOx from lightning?
What is the best way to address subgrid-scale wet deposition of species?
How important is the ice phase?  What do we need to include?