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@ARTICLE{Neumann:22398,
      author       = {Neumann, J.A. and Trainer, M. and Aikin, K.C. and Angevine,
                      W.M. and Brioude, J. and Brown, S.S. and de Gouw, J.A. and
                      Dube, W.P. and Flynn, J.H. and Graus, M. and Holloway, J.S.
                      and Lefer, B.L. and Nedelec, P. and Nowak, J.B. and Parrish,
                      D.D. and Pollack, I.B. and Roberts, J.M. and Ryerson, T.B.
                      and Smit, H. and Thouret, V. and Wagner, N.L.},
      title        = {{O}bservations of ozone transport from the free troposphere
                      to the {L}os {A}ngeles basin},
      journal      = {Journal of Geophysical Research},
      volume       = {117},
      issn         = {0148-0227},
      address      = {Washington, DC},
      publisher    = {Union},
      reportid     = {PreJuSER-22398},
      pages        = {1 - 15},
      year         = {2012},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Analysis of in situ airborne measurements from the CalNex
                      2010 field experiment (Research at the Nexus of Air Quality
                      and Climate Change) show that ozone in the boundary layer
                      over Southern California was increased by downward mixing of
                      air from the free troposphere (FT). The chemical
                      composition, origin, and transport of air upwind and over
                      Los Angeles, California, were studied using measurements of
                      carbon monoxide (CO), ozone, reactive nitrogen species, and
                      meteorological parameters from the National Oceanic and
                      Atmospheric Administration WP-3D aircraft on 18 research
                      flights in California in May and June 2010. On six flights,
                      multiple vertical profiles from 0.2-3.5 km above ground
                      level were conducted throughout the Los Angeles (LA) basin
                      and over the Pacific Ocean. Gas phase compounds measured in
                      32 vertical profiles are used to characterize air masses in
                      the FT over the LA basin, with the aim of determining the
                      source of increased ozone observed above the planetary
                      boundary layer (PBL). Four primary air mass influences were
                      observed regularly in the FT between approximately 1 and 3.5
                      km altitude: upper tropospheric air, long-range transport of
                      emissions, aged regional emissions, and marine air. The
                      first three air mass types accounted for $89\%$ of the FT
                      observations. Ozone averaged 71 ppbv in air influenced by
                      the upper troposphere, 69 ppbv in air containing emissions
                      transported long distances, and 65 ppbv in air with aged
                      regional emissions. Correlations between ozone and CO, and
                      ozone and nitric acid, demonstrate entrainment of ozone from
                      the FT into the LA PBL. Downward transport of ozone-rich air
                      from the FT into the PBL contributes to the ozone burden at
                      the surface in this region and makes compliance with air
                      quality standards challenging.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000301498500006},
      doi          = {10.1029/2011JD016919},
      url          = {https://juser.fz-juelich.de/record/22398},
}