HR: 0830h
AN: A41C-0707    [PDF]
TI: Polar Stratospheric Cloud Properties Observed During SOLVE-2 and Comparisons with SOLVE-1 Results
AU: Butler, C F
EM: c.f.butler@larc.nasa.gov
AF: NASA Langley Research Center, Mail Stop 401A, Hampton, VA 23681 United States
AU: * Browell, E V
EM: e.v.browell@larc.nasa.gov
AF: NASA Langley Research Center, Mail Stop 401A, Hampton, VA 23681 United States
AU: Hostetler, C A
EM: c.a.hostetler@larc.nasa.gov
AF: NASA Langley Research Center, Mail Stop 420, Hampton, VA 23681 United States
AU: Grant, W B
EM: w.b.grant@larc.nasa.gov
AF: NASA Langley Research Center, Mail Stop 401A, Hampton, VA 23681 United States
AU: Kooi, S A
EM: s.a.kooi@larc.nasa.gov
AF: NASA Langley Research Center, Mail Stop 401A, Hampton, VA 23681 United States
AU: Notari, A
EM: a.notari@larc.nasa.gov
AF: NASA Langley Research Center, Mail Stop 401A, Hampton, VA 23681 United States
AU: Lait, L R
EM:
AF: NASA Goddard Space Flight Center, Mail Code 916, Greenbelt, MD 20771 United States
AB: During the SAGE-III (Stratospheric Aerosol and Gas Experiment) Ozone Loss and Validation Experiments (SOLVE-1 in 1999-2000 and SOLVE-2 in 2003), two multiple-wavelength lidar systems were operated from the NASA DC-8 aircraft to make measurements of background aerosols and polar stratospheric clouds (PSCs) on long-range flights across the wintertime polar vortex. Aerosol scattering ratio (ASR) measurements were made at 1064, 622, 532, and 311 nm, and aerosol depolarization measurements were made at 622 and 532 nm (both campaigns) and at 1064 nm (SOLVE-1 only). Meteorological analyses from the NASA Goddard DAO (Data Assimilation Office) were also used in these investigations. The optical and spatial characteristics of the PSCs observed during the course of the SOLVE-2 campaign are discussed in this paper along with their associated temperature distributions and other meteorological parameters. Type Ib PSCs with moderate aerosol scattering ratios (typically ASR (622/532 nm) of 0.5-2.0) and nearly zero depolarization were observed during SOLVE-2 in the 18-24 km altitude (geometric) range over large regions in the cold pool near the edge of the polar vortex. These PSCs were often accompanied by a high tropopause and deep cirrus clouds in the troposphere. Type II PSCs with very high aerosol scattering and high depolarization were observed in association with mountain waves near the Norwegian coast. Limited sightings of Type Ia PSCs with low scattering ratios (ASR (622/532 nm) $<$0.5) and enhanced depolarization were found during the early part of SOLVE-2. Evidence was also observed of the swelling of sulfate aerosols in the lower stratosphere as the temperatures approached 195K. Results on the frequency of observation and the optical and spatial characteristics of the observed PSCs during SOLVE-2 are presented and compared to the more extensive PSC observations during the SOLVE-1 campaign.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0320 Cloud physics and chemistry
DE: 0340 Middle atmosphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting