Marine biogeochemical control on ozone deposition over the ocean

Yang, Mingxi ORCID: https://orcid.org/0000-0002-8321-5984; Phillips, Daniel P.; Hopkins, Frances E.; Liss, Peter; Suntharalingam, Parvadha ORCID: https://orcid.org/0000-0001-9461-8845; Carpenter, Lucy J. ORCID: https://orcid.org/0000-0002-6257-3950; Chance, Rosie ORCID: https://orcid.org/0000-0002-5906-176X; Brown, Lucy V.; Stapleton, Charlotte G. ORCID: https://orcid.org/0000-0001-7789-4864; Jones, Matthew R. ORCID: https://orcid.org/0000-0001-8077-2331; Dall'Olmo, Giorgio ORCID: https://orcid.org/0000-0003-3931-4675. 2025 Marine biogeochemical control on ozone deposition over the ocean. Geophysical Research Letters, 52 (12). 10.1029/2024GL113187

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Text © 2025. The Author(s).This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited Geophysical Research Letters - 2025 - Yang - Marine Biogeochemical Control on Ozone Deposition Over the Ocean.pdf - Published Version Available under License Creative Commons Attribution 4.0. Download (1MB) | Preview

Abstract/Summary

The ocean is a large but uncertain sink of tropospheric ozone. Ozone deposition is controlled partly by its reactions with marine substances, but in situ evidence of this marine biogeochemical control remains sparse. Here we report a novel measurement of ozone uptake efficiency (OUE) from a trans-Atlantic cruise (50°N to 45°S). Observed OUE for surface waters varied two-fold and the implied chemical deposition velocity varied from 0.012 to 0.034 cm s−1. Iodide accounted for on average 2/3 of total OUE, with generally higher contributions in tropical waters. The residual OUE, generally higher in temperate waters and positively correlated with biological proxies, was likely due to marine organics. OUE was also measured for 1,000 m waters, which were likely devoid of iodide but contained biologically refractory organics. Unexpectedly, these waters were rather reactive toward ozone, suggesting that surface organics that affect ozone uptake are not all freshly produced by marine biota.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1029/2024GL113187
ISSN:	0094-8276
Additional Keywords:	ozone deposition, ocean, air-sea exchange, heterogenous reactions, iodide, organics
Date made live:	02 Jul 2025 15:22 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/539769

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