HR: 1340h
AN: A13B-1168    [Abstracts]
TI: The Polarization Signature of Arctic Fog during the Polar Sunrise
AU: Marsh, B
EM: bmmarsh@buffalo.edu
AF: Department of Physics. University of Buffalo. Buffalo, NY, 239 Fronczak Hall, Buffalo, NY 14260-1500, United States
AU: * Fochesatto, G J
EM: foch@gi.alaska.edu
AF: Geophysical Institute. University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775,
AU: Sassen, K
EM: ksassen@gi.alaska.edu
AF: Geophysical Institute. University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775,
AU: Collins, R L
EM: rlc@gi.alaska.edu
AF: Geophysical Institute. University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775,
AU: Cahill, C F
EM: ffcfc@uaf.edu
AF: Geophysical Institute. University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775,
AU: Shaw, G E
EM: gshaw@gi.alaska.edu
AF: Geophysical Institute. University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775,
AB: This investigation reports the polarization Lidar signature in the near infrared (1.574 µm) of mixed phase and supercooled water fog collected during the polar sunrise period February-March 2007 at ambient temperatures from -33 C to -29 C respectively. A simple physical model and a scattering matrix simulation code for non spherical particles were combined to simulate the microphysical and optical properties of the measured fog under the environmental conditions of the experiment. A good agreement between the simulated and measured values of the lidar observable (i.e. linear depolarization fraction) was found. The measured volumetric linear depolarization ratio suggests negative temperature dependence.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 3311 Clouds and aerosols
DE: 3349 Polar meteorology
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting