HR: 0800h
AN: A51D-0815    [Abstracts]
TI: Microphysical Modeling and POAM III Observations of Dehydration and Aerosol Extinction in the Antarctic Vortex
AU: * Benson, C
EM: benson@nrl.navy.mil
AF: Naval Research Laboratory, Remote Sensing Division, Washington, DC 20375
AU: Drdla, K
EM: katja@katja.arc.nasa.gov
AF: NASA Ames Research Center, Mailstop 245-4, Moffett Field, CA 94035
AU: Nedoluha, G
EM: nedoluha@nrl.navy.mil
AF: Naval Research Laboratory, Remote Sensing Division, Washington, DC 20375
AU: Shettle, E
EM: shettle@nrl.navy.mil
AF: Naval Research Laboratory, Remote Sensing Division, Washington, DC 20375
AU: Hoppel, K
EM: hoppel@wvms.nrl.navy.mil
AF: Naval Research Laboratory, Remote Sensing Division, Washington, DC 20375
AU: Bevilacqua, R
EM: bevilacqua@wvms.nrl.navy.mil
AF: Naval Research Laboratory, Remote Sensing Division, Washington, DC 20375
AB: Stratospheric dehydration is examined for the Antarctic winter using the Integrated Microphysics and Aerosol Chemistry on Trajectories (IMPACT) model and data obtained by the Polar Ozone and Aerosol Measurement (POAM) III instrument. The model is applied to individual air parcels which are advected along 3-D trajectories using UKMO or NCEP global wind and temperature fields. Model results are compared to water vapor and aerosol extinction measurements obtained with the POAM instrument. The predicted water vapor mixing ratio value at the end of the winter season is consistent with POAM data, although modeled dehydration occurs more rapidly than is observed with POAM. Dehydration predictions in conjunction with modeled and observed aerosol extinctions allow several model parameters to be constrained. For example, measured aerosol extinctions provide useful limits on the NAT freezing parameters used in the model. In addition, a small temperature uncertainty is found to considerably affect model results.
DE: 3337 Numerical modeling and data assimilation
DE: 3360 Remote sensing
DE: 1610 Atmosphere (0315, 0325)
DE: 1640 Remote sensing
DE: 0340 Middle atmosphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting