HR: 09:45h
AN: A21D-08 [Abstracts]
TI: Interannual variability of surface NOx at the South Pole
AU: * Wang, Y
EM: ywang@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, EAS, Atlanta, GA 30332
AU: Choi, Y
EM: yunsoo.choi@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, EAS, Atlanta, GA 30332
AU: Zeng, T
EM: tzeng@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, EAS, Atlanta, GA 30332
AB:
Three field measurements (ISCAT 1998, 2000 and ANTCI 2003) have shown high concentrations of surface NOx at the South Pole.
They also show a large interannual variability in the occurrence of high NOx events. We have used the polar version of
NCAR/Penn State MM5 to assimilate the meteorological fields for the three field experiments using the ECMWF meteorological
products and surface and rawinsonde observations. 1-D column and 3-D chemical transport models, driven by polar MM5
assimilation fields, are applied to simulate the evolution of surface NOx and other observed trace gases at the South Pole
during the three experiments. We show that meteorological variability is a major contributor to the observed interannual
variability. The 3-D model results imply a photochemical oxidizing øcanopyñ over Antarctica due to surface NOx emissions.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting