Marine biogeochemical control on ozone deposition over the ocean

Yang, Mingxi, Phillips, Daniel P., Hopkins, Frances E., Liss, Peter, Suntharalingam, Parvadha, Carpenter, Lucy J., Chance, Rosie, Brown, Lucy V., Stapleton, Charlotte G., Jones, Matthew R. and Dall'Olmo, Giorgio (2025) Marine biogeochemical control on ozone deposition over the ocean. Geophysical Research Letters, 52 (12). ISSN 0094-8276

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Abstract

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:	Article
Additional Information:	Data Availability Statement: Observations from this paper are archived and freely accessible at the British Oceanographic Data Centre (Yang & Phillips, 2024). Acknowledgments: We would like to acknowledge the support from the officers, crew, and fellow scientists during the AMT29 cruise. AMT is funded by the UK Natural Environment Research Council (NERC) through its National Capability Long-term Single Centre Science Program, Climate Linked Atlantic Sector Science (NE/R015953/1). This study contributes to the international SOLAS and IMBeR programs and is contribution number 410 of the AMT program. DPP was funded by an EnvEast DTP Grant (NE/L002582/1). LJC, LVB, RJC and MJ were supported with funds from the European Research Council (833290). CGS was supported by the Leeds-York-Hull DTP Panorama (NE/S007458/1). This work contributes to the ACSIS (NE/N018044/1) and COCO-VOC (NE/Z000335/1) projects, which supported MY and FH. Finally, we thank P. Nightingale (Plymouth Marine Laboratory) for insightful discussions.
Faculty \ School:	University of East Anglia Research Groups/Centres > Theme - ClimateUEA Faculty of Science > School of Environmental Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Climatic Research Unit Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Depositing User:	LivePure Connector
Date Deposited:	18 Jun 2025 09:30
Last Modified:	18 Jun 2025 10:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/99597
DOI:	10.1029/2024GL113187

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