HR: 11:35h
AN: A42A-06    [Abstracts]
TI: Large-Scale Ozone and Aerosol Variations Observed Over the Pacific Ocean During the INTEX-B Field Experiment
AU: * Browell, E V
EM: Edward.V.Browell@nasa.gov
AF: NASA Langley Research Center, MS-401A, Hampton, VA 23681, United States
AU: Hair, J W
EM: Johnathan.W.Hair@nasa.gov
AF: NASA Langley Research Center, MS-401A, Hampton, VA 23681, United States
AU: Butler, C F
EM: Carolyn.F.Butler@nasa.gov
AF: SSAI, MS-927, Hampton, VA 23681, United States
AU: Fenn, M A
EM: Marta.A.Fenn@nasa.gov
AF: SSAI, MS-927, Hampton, VA 23681, United States
AU: Notari, A
AF: SSAI, MS-927, Hampton, VA 23681, United States
AU: Kooi, S A
EM: Susan.A.Kooi@nasa.gov
AF: SSAI, MS-927, 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 A
EM: Melody.A.Avery@nasa.gov
AF: NASA Langley Research Center, MS-401A, Hampton, VA 23681, United States
AU: Pierce, R B
EM: Brad.Pierce@noaa.gov
AF: NOAA/NESDIS, 1225 W. Dayton Street, Madison, WI 53706, United States
AB: Large-scale distributions of ozone and aerosols were measured with a differential absorption lidar (DIAL) on the NASA DC-8 aircraft during the second part of the Intercontinental Chemical Transport Experiment - Phase B (INTEX-B) field experiment conducted over the Pacific Ocean from 17 April to 15 May 2006. Remote ozone and aerosol profiles were simultaneously measured below and above the DC-8 to provide information from near the surface to above the tropopause along the flight track. Multiple-wavelength aerosol backscatter measurements were made to estimate the relative size of the aerosols, and simultaneous aerosol depolarization measurements were made to detect the presence of nonspherical aerosols, such as mineral dust. In situ measurements of ozone were also made onboard the DC-8, and these were used to constrain the interpolation of the nadir and zenith ozone lidar measurements, which then provided an estimate of the entire tropospheric ozone profile along the flight track. Large-scale measurements of tropospheric ozone and aerosol distributions were obtained on all INTEX-B flights over the Pacific, and the long-range transport of aged and relatively fresh Asian pollution was often observed in the free troposphere in eastern Pacific. Comparisons have been made between the measured ozone cross sections and results from chemical transport models, which show general agreement in the atmospheric structure and pollution layer features. Average latitudinal and longitudinal variations of ozone and aerosols have also been derived from the remote and in situ ozone data for INTEX-B, and these results are compared to previous field experiments. The contribution of stratosphere-troposphere exchange to the latitudinal variation of ozone over the Pacific has also been examined. This paper discusses these results and relates them to chemical and dynamical processes that produce the observed large-scale variations in ozone and aerosols over the Pacific.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting