Ozone deposition to a coastal sea: comparison of eddy covariance observations with reactive air–sea exchange models

Loades, DC; Yang, M; Bell, TG; Vaughan, AR; Pound, RJ; Metzger, S; Lee, JD; Carpenter, LJ. 2020 Ozone deposition to a coastal sea: comparison of eddy covariance observations with reactive air–sea exchange models. Atmospheric Measurement Techniques, 13 (12). 6915-6931. https://doi.org/10.5194/amt-13-6915-2020

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Official URL: http://dx.doi.org/10.5194/amt-13-6915-2020

Abstract/Summary

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 (PPAO) on the south coast of the UK during April and May 2018. The median O3 flux was−0.132 mg m−2h−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. We demonstrate that a typical single flux observation was above the 2σlimit of detection but had considerable uncertainty. The median 2σuncertainty of deposition velocity was 0.031 cm s−1for each 20 min period, which reduces with the square root of the sample size. Eddy covariance footprint analysis of the site indicates that the flux footprint was predominantly over water(>96 %), varying with atmospheric stability and, to a lesser extent, with the tide. At very low wind speeds when the atmosphere was typically unstable, the observed ozone deposition velocity was elevated, most likely because the foot-print contracted to include a greater land contribution in these conditions. At moderate to high wind speeds when atmo-spheric stability was near-neutral, the ozone deposition ve-locity increased with wind speed and showed a linear dependence with friction velocity. This observed dependence on friction velocity (and therefore also wind speed) is consistent with the predictions from the one-layer model of Fairallet al. (2007), which parameterises the oceanic deposition of ozone from the fundamental conservation equation, accounting for both ocean turbulence and near-surface chemical destruction, while assuming that chemical O3 destruction by iodide is distributed over depth. In contrast to our observations, the deposition velocity predicted by the recently devel-oped two-layer model of Luhar et al. (2018) (which considers iodide reactivity in both layers but with molecular diffusivity dominating over turbulent diffusivity in the first layer)shows no major dependence of deposition velocity on wind speed and underestimates the measured deposition velocities.These results call for further investigation into the mechanisms and control of oceanic O3 deposition.

Item Type: Publication - Article
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User: S Hawkins
Date made live: 15 Jan 2021 15:01
Last Modified: 15 Jan 2021 15:01
URI: http://plymsea.ac.uk/id/eprint/9101

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