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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-65
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-65
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  27 May 2020

27 May 2020

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This preprint is currently under review for the journal AMT.

Measurements of Ozone Deposition to a Coastal Sea by Eddy Covariance

David C. Loades1, Mingxi Yang2, Thomas G. Bell2, Adam R. Vaughan1, Ryan J. Pound1, Stefan Metzger3,4, James D. Lee4,5, and Lucy J. Carpenter1 David C. Loades et al.
  • 1Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, University Road, York, YO10 5DD, UK
  • 2Plymouth Marine Laboratory, Prospect Place, Plymouth, PL1 3DH, UK
  • 3National Ecological Observatory Network Program, Battelle, 1685 38th Street, Boulder, CO 80301, USA
  • 4Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, 1225 West Dayton Street, Madison, WI 53706, USA
  • 5National Centre for Atmospheric Science, University of York, University Road, York, YO10 5DD, UK

Abstract. A fast response (10 Hz) chemiluminescence detector for ozone (O3) was used to determine O3 fluxes using the eddy covariance technique at the Penlee Point Atmospheric Observatory on the south coast of the UK during April and May 2018. The median O3 flux was −0.132 mg m−2 h−1 (0.018 ppbv m s−1) corresponding to a deposition velocity of 0.037 cm s−1 (interquartile range 0.017–0.065 cm s−1) – similar to the higher values previously reported for open ocean flux measurements, but not as high as some other coastal results. Eddy covariance footprint analysis of the site indicates that the flux footprint was predominantly over water (> 96 %), varying slightly with tide. At moderate-to-high wind speeds, ozone deposition increased with wind speed, and showed a linear dependence with friction velocity of comparable magnitude to predictions from the one-layer model of (Fairall et al., 2007). Deposition was also elevated at very low wind speeds, most likely because the footprint contracted to include a greater land contribution in these conditions.

David C. Loades et al.

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David C. Loades et al.

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Latest update: 29 Oct 2020
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Short summary
The loss of ozone to the sea surface was measured from the south coast of the UK, and was found to be more rapid than previous observations over the open ocean. This is likely a consequence of different chemistry and biology in coastal environments. Strong winds appeared to speed up the loss of ozone. A better understanding of what influences ozone loss over the sea will lead to better model estimates of total ozone in the troposphere.
The loss of ozone to the sea surface was measured from the south coast of the UK, and was found...
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