HR: 1340h
AN: A13C-1369    [Abstracts]
TI: Lidar Measurements of Ozone, Aerosols, and Clouds Observed in the Tropics Near Central America During TC4-Costa Rica
AU: * Hair, J W
EM: Johnathan.W.Hair@nasa.gov
AF: NASA Langley Research Center, MS-401A, Hampton, VA 23681, United States
AU: Browell, E
EM: Edward.V.Browell@nasa.gov
AF: NASA Langley Research Center, MS-401A, Hampton, VA 23681, United States
AU: Butler, C
EM: Carolyn.F.Butler@nasa.gov
AF: Science Systems & Applications Inc., MS-927, Hampton, VA 23681, United States
AU: Fenn, M
EM: Marta.A.Fenn@nasa.gov
AF: Science Systems & Applications Inc., MS-927, Hampton, VA 23681, United States
AU: Notari, A
EM: Anthony.Notari-1@nasa.gov
AF: Science Systems & Applications Inc., MS-927, Hampton, VA 23681, United States
AU: Simpson, S
EM: Steven.M.Simpson@nasa.gov
AF: Oak Ridge Associated Universities, MS-401A, Hampton, VA 23681, United States
AU: Ismail, S
EM: Syed.Ismail-1@nasa.gov
AF: NASA Langley Research Center, MS-401A, Hampton, VA 23681, United States
AU: Avery, M
EM: Melody.A.Avery@nasa.gov
AF: NASA Langley Research Center, MS-401A, Hampton, VA 23681, United States
AB: Large-scale measurements of ozone and aerosol distributions were made from the NASA DC-8 aircraft during the TC4 (Tropical Composition, Cloud, and Climate Coupling) field experiment conducted from June 28 - August 10, 2007 based in San Jose, Costa Rica. Remote measurements were made with an airborne lidar to provide ozone and multiple-wavelength aerosol and cloud backscatter profiles from near the surface to above the tropopause along the flight track. Aerosol depolarization measurements were also made for the detection of nonspherical aerosols, such as mineral dust, biomass burning, and recent emissions from South American volcanoes. Long-range transport of Saharan dust with depolarizing aerosols was frequently observed in the lower troposphere both over the Caribbean Sea and Pacific Ocean and within the marine boundary layer. In addition, visible and sub-visible cirrus clouds were observed with the multi-wavelength backscatter and depolarization measurements. Initial distributions of ozone, aerosol, and cloud are presented which will be used to interpret large-scale atmospheric processes. In situ measurements of ozone and aerosols made onboard the DC-8 will be compared to the remote lidar measurements. This paper provides a first look at the characteristics of ozone, aerosol, and cloud distributions that were encountered during this field experiment and provide a unique dataset that will be further related through satellite data, backward trajectories, and chemical transport models (CTM) to sources and sinks of ozone, aerosols, and clouds and to dynamical, chemical, and radiative processes.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0365 Troposphere: composition and chemistry
DE: 3311 Clouds and aerosols
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting