Changing atmospheric acidity as a modulator of nutrient deposition and ocean biogeochemistry

Changing atmospheric acidity alters the delivery of nutrients to the ocean and affects marine productivity and ecology. Anthropogenic emissions to the atmosphere have increased the flux of nutrients, especially nitrogen, to the ocean, but they have also altered the acidity of aerosol, cloud water, a...

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Published inScience advances Vol. 7; no. 28
Main Authors Baker, Alex R., Kanakidou, Maria, Nenes, Athanasios, Myriokefalitakis, Stelios, Croot, Peter L., Duce, Robert A., Gao, Yuan, Guieu, Cécile, Ito, Akinori, Jickells, Tim D., Mahowald, Natalie M., Middag, Rob, Perron, Morgane M. G., Sarin, Manmohan M., Shelley, Rachel, Turner, David R.
Format Journal Article
LanguageEnglish
Published American Association for the Advancement of Science (AAAS) 01.07.2021
American Association for the Advancement of Science
Subjects
Atmospheric Science
Earth Sciences
Environmental Studies
Geochemistry
Geokemi
Ocean, Atmosphere
Review
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Sciences of the Universe
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Summary:Changing atmospheric acidity alters the delivery of nutrients to the ocean and affects marine productivity and ecology. Anthropogenic emissions to the atmosphere have increased the flux of nutrients, especially nitrogen, to the ocean, but they have also altered the acidity of aerosol, cloud water, and precipitation over much of the marine atmosphere. For nitrogen, acidity-driven changes in chemical speciation result in altered partitioning between the gas and particulate phases that subsequently affect long-range transport. Other important nutrients, notably iron and phosphorus, are affected, because their soluble fractions increase upon exposure to acidic environments during atmospheric transport. These changes affect the magnitude, distribution, and deposition mode of individual nutrients supplied to the ocean, the extent to which nutrient deposition interacts with the sea surface microlayer during its passage into bulk seawater, and the relative abundances of soluble nutrients in atmospheric deposition. Atmospheric acidity change therefore affects ecosystem composition, in addition to overall marine productivity, and these effects will continue to evolve with changing anthropogenic emissions in the future.
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ISSN:2375-2548
2375-2548
DOI:10.1126/sciadv.abd8800