HR: 0800h
AN: A21C-0885    [Abstracts]
TI: Modelling the Impact of Snowpack Emissions in the Antarctic
AU: * Hamer, P
EM: Paul.Hamer@bristol.ac.uk
AF: Atmospheric Chemistry Research Group, School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS United Kingdom
AU: Shallcross, D
EM: d.e.shallcross@bristol.ac.uk
AF: Atmospheric Chemistry Research Group, School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS United Kingdom
AB: Contrary to previous assumptions, recent studies in Antarctica have shown that there is a wide variety of chemistry occuring within the boundary layer . It is believed that the main drivers behind this chemistry are emissions of NO_x, HONO and carbonyl species from the snowpack coupled with high actinic fluxes during the polar spring/summertime. These emissions influence the overlying atmosphere and force ozone concentrations to rise. This study has taken an existing urban chemistry two-box model and heavily modified it to adapt it to Antarctic conditions. The culmination of these modifications has lead to the most recent version which can go some way towards reproducing some of the unusual chemistry that leads to high ozone episodes (40 ppbv). Such high concentrations of ozone are difficult to reproduce in a model when background hydrocarbons are so low, but by invoking some of the unusual emisisons identified it is possible to mimick these episodes.
DE: 0317 Chemical kinetic and photochemical properties
DE: 3307 Boundary layer processes
DE: 3355 Regional modeling
DE: 9310 Antarctica (4207)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005