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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-338
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 23 Oct 2018

Research article | 23 Oct 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Intercomparison of lidar, aircraft, and surface ozone measurements in the San Joaquin Valley during the California Baseline Ozone Transport Study (CABOTS)

Andrew O. Langford1, Raul J. Alvarez1, Guillaume Kirgis1,2, Christoph J. Senff1,2, Dani Caputi3, Stephen A. Conley4, Ian C. Faloona3, Laura T. Iraci5, Josette E. Marrero5,a, Mimi E. McNamara5,7,b, Ju-Mee Ryoo5,c, and Emma Yates5,6 Andrew O. Langford et al.
  • 1NOAA Earth System Research Laboratory/Chemical Sciences Division, Boulder, CO 80305, USA
  • 2Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, 80309, USA
  • 3Department of Land, Air, and Water Resources, University of California, Davis, CA, 95616, USA
  • 4Scientific Aviation, Inc., Boulder, Colorado, 80 301, USA
  • 5Atmospheric Science Branch, NASA Ames Research Center, Moffett Field, CA, 94035, USA
  • 6Bay Area Environmental Research Institute, Petaluma, CA 94952, USA
  • 7Environmental Science and Policy Department, University of California, Davis, CA, 95616, USA
  • anow at: Sonoma Technology, Inc., Petaluma, CA, 94954
  • bnow at: Illingworth & Rodkin, Inc., Petaluma, CA 94954
  • cnow at: Science and Technology Corporation, Moffett Field, CA, 94035

Abstract. The California Baseline Ozone Transport Study (CABOTS) was conducted in the late spring and summer of 2016 to investigate the influence of long-range transport and stratospheric intrusions on surface ozone (O3) concentrations in California with emphasis on the San Joaquin Valley (SJV), one of two extreme ozone non-attainment areas in the U.S. One of the major objectives of CABOTS was to characterize the vertical distribution of O3 and aerosols above the SJV to aid in the identification of elevated transport layers and assess their surface impacts. To this end, the NOAA Earth System Research Laboratory (ESRL) deployed the Tunable Optical Profiler for Aerosol and oZone (TOPAZ) mobile lidar to the Visalia Municipal Airport (36.315°N, −119.392°E) in the central SJV between 27 May and 7 August 2016. Here we compare the TOPAZ ozone and backscatter measurements with co-located in-situ surface measurements and nearby regulatory monitors, and to airborne measurements from the University of California at Davis/Scientific Aviation Mooney and NASA Alpha Jet Atmospheric eXperiment (AJAX) research aircraft. Our analysis shows excellent agreement between the lidar and in-situ measurements, lending confidence to the use of these data sets for more detailed analyses.

Andrew O. Langford et al.
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Andrew O. Langford et al.
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Short summary
Lidar and aircraft measurements of ozone made during the California Baseline Ozone Transport Study (CABOTS) are compared to assess the validity of these measurements, and assess their suitability for further investigations into the contributions of stratosphere-to-troposphere transport and Asian pollution to the high surface ozone concentrations found in the San Joaquin Valley of California during summer.
Lidar and aircraft measurements of ozone made during the California Baseline Ozone Transport...
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