HR: 0800h
AN: A21C-0877    [Abstracts]
TI: Modeling of HONO at the South Pole during ANTCI 2003
AU: * Liao, W
EM: gtg341c@prism.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive , Atlanta, Ga 30332 United States
AU: Tan, D
EM: dtan@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive , Atlanta, Ga 30332 United States
AB: Current pure gas photochemistry modeling cannot accurately predict the high levels of HONO observed at South Pole during ANTCI 2003. A 1D photochemistry model is developed and applied to observational data. Model inputs include deposition of HNO3, concentration of nitrate and nitrite, hydrolysis of NO2, pH of snow, adsorption and desorption of HONO on quasi liquid layer of snow, etc; the model will estimate the snowpack emission term as well as gas-phase production and loss. Meteorological conditions associated with the transport of HONO are studied to determine if transport significantly affects HONO concentrations. Finally, the observed HONO will be analyzed to determine its contribution to the HOx budget.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0317 Chemical kinetic and photochemical properties
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005