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

• Published in: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
• Main Authors: Hopkins, Frances, Suntharalingam, Parvadha, Gehlen, Marion, Andrews, Oliver, Archer, Stephen, Bopp, Laurent, Buitenhuis, Erik, Dadou, Isabelle, Duce, Robert, Goris, Nadine, Jickells, Tim, Johnson, Martin, Keng, Fiona, Law, Cliff, Lee, Kitack, Liss, Peter, Lizotte, Martine, Malin, Gillian, Murrell, J. Colin, Naik, Hema, Rees, Andrew, Schwinger, Jörg, Williamson, Philip
• Other Authors: Plymouth Marine Laboratory (PML), Plymouth Marine Laboratory, School of Environmental Sciences Norwich, University of East Anglia Norwich (UEA), Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), School of Geographical Sciences Bristol, University of Bristol Bristol, Bigelow Laboratory for Ocean Sciences, Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Department of Atmospheric Sciences College Station, Texas A&M University College Station, Bjerknes Centre for Climate Research (BCCR), Department of Biological Sciences Bergen (BIO / UiB), University of Bergen (UiB)-University of Bergen (UiB), University of Malaya Kuala Lumpur, Malaisie, National Institute of Water and Atmospheric Research Wellington (NIWA), Pohang University of Science and Technology (POSTECH), Groupe de Recherche sur les Enjeux de la Communication (GRESEC), Université Grenoble Alpes (UGA), Université Laval Québec (ULaval), National Institute of Oceanography (NIO), Council of Scientific and Industrial Research India (CSIR)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2020
• Subjects: Subject Areas: atmospheric chemistry; biogeochemistry; oceanography Keywords: ocean acidification; marine trace gases; climate; atmospheric chemistry; geo; envir; Ocean acidification
• Online Access: https://doi.org/10.1098/rspa.2019.0769; https://hal.sorbonne-universite.fr/hal-02873467/file/rspa.2019.0769.pdf; https://hal.sorbonne-universite.fr/hal-02873467

International audience Surface ocean biogeochemistry and photochemistry regulate ocean–atmosphere fluxes of tracegases critical for Earth’s atmospheric chemistry and climate. The oceanic processes governingthese fluxes are often sensitive to the changes in ocean pH (orpCO2) accompanying oceanacidification (OA), with potential for future climate feedbacks. Here, we review currentunderstanding (from observational, experimental and model studies) on the impact of OAon marine sources of key climate-active trace gases, including dimethyl sulfide (DMS), nitrousoxide (N2O), ammonia and halocarbons. We focus on DMS, for which available information isconsiderably greater than for other trace gases. We highlight OA-sensitive regions such as polaroceans and upwelling systems, and discuss the combined effect of multiple climate stressors(ocean warming and deoxygenation) on trace gas fluxes. To unravel the biological mechanismsresponsible for trace gas production, and to detect adaptation, we propose combining processrate measurements of trace gases with longer term experiments using both model organismsin the laboratory and natural planktonic communities in the field. Future ocean observationsof trace gases should be routinely accompanied by measurements of two components of thecarbonate system to improve our understanding of howin situcarbonate chemistry influencestrace gas production. Together, this will lead to improvements in current process modelcapabilities and more reliable predictions of future global marine trace gas fluxes.