HR: 13:55h
AN: A53D-02    [Abstracts]
TI: Large-Scale Air Mass Characteristics Observed Over North America and the Western Atlantic Ocean During INTEX-A/ICARTT
AU: * Browell, E V
EM: Edward.V.Browell@nasa.gov
AF: NASA Langley Research Center, Science Directorate, MS-401A, Hampton, VA 23681-2199 United States
AU: Fenn, M A
EM: M.A.Fenn@larc.nasa.gov
AF: Science Applications International Corp., One Enterprise Parkway, Hampton, VA 23666 United States
AU: Hair, J W
EM: Johnathan.W.Hair@nasa.gov
AF: NASA Langley Research Center, Science Directorate, MS-401A, Hampton, VA 23681-2199 United States
AU: Butler, C F
EM: C.F.Butler@larc.nasa.gov
AF: Science Applications International Corp., One Enterprise Parkway, Hampton, VA 23666 United States
AU: Notari, A
EM: A.Notari@larc.nasa.gov
AF: Science Applications International Corp., One Enterprise Parkway, Hampton, VA 23666 United States
AU: Kooi, S A
EM: S.A.Kooi@larc.nasa.gov
AF: Science Applications International Corp., One Enterprise Parkway, Hampton, VA 23666 United States
AU: Ismail, S
EM: Syed.Ismail@nasa.gov
AF: NASA Langley Research Center, Science Directorate, MS-401A, Hampton, VA 23681-2199 United States
AU: Avery, M A
EM: Melody.A.Avery@nasa.gov
AF: NASA Langley Research Center, Science Directorate, MS-401A, Hampton, VA 23681-2199 United States
AU: Pierce, R B
EM: R.B.Pierce@larc.nasa.gov
AF: NASA Langley Research Center, Science Directorate, MS-401A, Hampton, VA 23681-2199 United States
AU: Fuelberg, H E
EM: Fuelberg@met.fsu.edu
AF: Florida State University, Department of Meteorology, Tallahassee, FL 32306 United States
AB: Large-scale measurements of ozone (O₃) and aerosol distributions were made from the NASA DC-8 aircraft during the INTEX-A/ICARTT field experiment conducted from July 1-August 14, 2004. Remote measurements were made with an airborne lidar to provide O₃ and multiple-wavelength aerosol 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 and aerosols in fire plumes. In situ measurements of O₃, aerosols, and a wide range of trace gases were made onboard the DC-8 and correlated with the remote lidar measurements. Meteorological analyses of potential vorticity distributions along the flight track were used to indicate the fraction of observed O₃ that could be attributed to stratosphere-troposphere exchange. Five-day backward trajectories were also used to indicate the possible origin of observed air masses. Frequent mixtures of stratospheric air mixed with polluted tropospheric air masses were observed in the middle and upper troposphere. Exhanced O₃ concentrations and aerosol loading in the lower troposphere were found to be associated with U.S. pollution and advection of those air masses over the Atlantic Ocean. Long-range transport of fire plumes from Alaska were frequently observed with depolarizing aerosols over eastern North America. Average latitudinal O₃ and aerosol distributions were determined and related to large-scale atmospheric processes. This paper discusses the types and characteristics of air masses that were encountered during this field experiment, including their frequency and location (latitude and altitude) of observations, and relates them to different processes responsible for determining their characteristics.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 3362 Stratosphere/troposphere interactions
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005