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

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...

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Bibliographic Details
Published in:Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Main Authors: 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
Format: Article in Journal/Newspaper
Language:English
Published: Royal Society 2020
Subjects:
Atmospheric Sciences
Chemistry
Ecology and Environment
Marine Sciences
Ocean acidification
Online Access:http://plymsea.ac.uk/id/eprint/8945/
http://plymsea.ac.uk/id/eprint/8945/1/Hopkins%20et%20al%202020%20Proceedings%20A.pdf
https://doi.org/10.1098/rspa.2019.0769
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Summary: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.

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