HR: 1330h
AN: A42C-0772    [PDF]
TI: POAM III measurements of PSCs and water vapor in the Antarctic vortex: 1998-2003
AU: * Nedoluha, G E
EM: nedoluha@nrl.navy.mil
AF: Naval Research Lab, Code 7227, Washington, DC 20375 United States
AU: Bevilacqua, R M
EM: bevilacqua@nrl.navy.mil
AF: Naval Research Lab, Code 7227, Washington, DC 20375 United States
AU: Fromm, M D
EM: fromm@nrl.navy.mil
AF: Computational Physics Inc., 8001 Braddock Rd. Suite 210, Springfield, VA 22151 United States
AU: Hoppel, K W
EM: karl.hoppel@nrl.navy.mil
AF: Naval Research Lab, Code 7227, Washington, DC 20375 United States
AU: Lumpe, J D
EM: lumpe@cpi.com
AF: Computational Physics Inc., 8001 Braddock Rd. Suite 210, Springfield, VA 22151 United States
AU: Benson, C M
EM: benson@nrl.navy.mil
AF: Naval Research Lab, Code 7227, Washington, DC 20375 United States
AB: We present Polar Ozone and Aerosol Measurement (POAM) PSC and water vapor measurements obtained in the Antarctic stratosphere from 1998-2003. The temperatures at the POAM measurement locations were not exceptionally low during the July and August period, and the PSC statistics were not unusual. The amount of dehydration in the vortex is generally sensitive to the coldest temperatures in the vortex, and the coldest regions in 2003 Antarctic vortex during this period were unusually cold. POAM did observe unusually low water vapor mixing ratios, especially at the upper altitudes of the dehydration region. Water vapor mixing ratios at 22 km fell below 2 ppmv in early August, well outside the 4-6 ppmv range observed over the previous five years. We shall examine the interannual variation of water vapor and PSCs over the six Antarctic winters for which POAM data is available, and see how these are correlated with interannual variations in temperature.
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting