The impacts of ocean acidification on marine trace gases and the implications for atmospheric chemistry and climate

Hopkins, FE; Suntharalingam, P; Gehlen, M; Andrews, O; Archer, SD; Bopp, L; Buitenhuis, E; Dadou, I; Duce, R; Goris, N; Jickells, TD; Johnson, M; Keng, F; Law, CS; Lee, K; Liss, PS; Lizotte, M; Malin, G; Murrell, JC; Naik, H; Rees, AP; Schwinger, J; Williamson, P. 2020 The impacts of ocean acidification on marine trace gases and the implications for atmospheric chemistry and climate. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 476 (2237). 20190769.

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urfaceoceanbiogeochemistryandphotochemistryregulateocean–atmospherefluxesoftrace gases critical for Earth’s atmospheric chemistry and climate. The oceanic processes governing these fluxes are often sensitive to the changes in ocean pH (or pCO2) accompanying ocean acidification (OA), with potential for future climate feedbacks. Here, we review current understanding (from observational, experimental and model studies) on the impact of OA onmarinesourcesofkeyclimate-activetracegases,includingdimethylsulfide(DMS),nitrous oxide (N2O), ammonia and halocarbons. We focus on DMS, for which available information is considerablygreaterthanforothertracegases.WehighlightOA-sensitiveregionssuchaspolar oceans and upwelling systems, and discuss the combined effect of multiple climate stressors (oceanwarminganddeoxygenation)ontracegasfluxes.Tounravelthebiologicalmechanisms responsible for trace gas production, and to detect adaptation, we propose combining process rate measurements of trace gases with longer term experiments using both model organisms in the laboratory and natural planktonic communities in the field. Future ocean observations of trace gases should be routinely accompanied by measurements of two components of the carbonatesystemtoimproveourunderstandingofhowinsitucarbonatechemistryinfluences trace gas production. Together, this will lead to improvements in current process model capabilities and more reliable predictions of future global marine trace gas fluxes.

Item Type: Publication - Article
Additional Information. Not used in RCUK Gateway to Research.: Authorforcorrespondence: FrancesE.Hopkins
Additional Keywords: oceanacidification,marinetracegases, climate,atmosphericchemistry
Subjects: Atmospheric Sciences
Ecology and Environment
Marine Sciences
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User: S Hawkins
Date made live: 02 Jun 2020 10:20
Last Modified: 29 Sep 2020 12:00

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