Marine plastics alter the organic matter composition of the air-sea boundary layer, with influences on CO 2 exchange: a large-scale analysis method to explore future ocean scenarios.

Autor: Galgani L; Environmental Spectroscopy Group, Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Italy; Center for Colloids and Surface Science, Sesto Fiorentino, Italy; GEOMAR-Helmholtz Centre for Ocean Research Kiel, Germany; Harbor Branch Oceanographic Institute, Florida Atlantic University, USA. Electronic address: luisa.galgani@unisi.it., Tzempelikou E; Institute of Oceanography, Hellenic Centre for Marine Research, Anavyssos, Greece., Kalantzi I; Institute of Oceanography, Hellenic Centre for Marine Research, Heraklion, Greece., Tsiola A; Institute of Oceanography, Hellenic Centre for Marine Research, Heraklion, Greece., Tsapakis M; Institute of Oceanography, Hellenic Centre for Marine Research, Heraklion, Greece., Pitta P; Institute of Oceanography, Hellenic Centre for Marine Research, Heraklion, Greece., Esposito C; Lake Ecology, Department of Ecoscience and WATEC Aarhus University Centre for Water Technology, Aarhus University, Denmark., Tsotskou A; Institute of Oceanography, Hellenic Centre for Marine Research, Heraklion, Greece; University of Western Macedonia, School of Agricultural Sciences, Department of Agriculture, Florina, Greece., Magiopoulos I; Institute of Oceanography, Hellenic Centre for Marine Research, Heraklion, Greece., Benavides R; GEOMAR-Helmholtz Centre for Ocean Research Kiel, Germany., Steinhoff T; GEOMAR-Helmholtz Centre for Ocean Research Kiel, Germany., Loiselle SA; Environmental Spectroscopy Group, Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Italy; Center for Colloids and Surface Science, Sesto Fiorentino, Italy; Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, Florence, Italy.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2023 Jan 20; Vol. 857 (Pt 3), pp. 159624. Date of Electronic Publication: 2022 Oct 21.
DOI: 10.1016/j.scitotenv.2022.159624
Abstrakt: Microplastics are substrates for microbial activity and can influence biomass production. This has potentially important implications in the sea-surface microlayer, the marine boundary layer that controls gas exchange with the atmosphere and where biologically produced organic compounds can accumulate. In the present study, we used six large scale mesocosms to simulate future ocean scenarios of high plastic concentration. Each mesocosm was filled with 3 m 3 of seawater from the oligotrophic Sea of Crete, in the Eastern Mediterranean Sea. A known amount of standard polystyrene microbeads of 30 μm diameter was added to three replicate mesocosms, while maintaining the remaining three as plastic-free controls. Over the course of a 12-day experiment, we explored microbial organic matter dynamics in the sea-surface microlayer in the presence and absence of microplastic contamination of the underlying water. Our study shows that microplastics increased both biomass production and enrichment of carbohydrate-like and proteinaceous marine gel compounds in the sea-surface microlayer. Importantly, this resulted in a ∼3 % reduction in the concentration of dissolved CO 2 in the underlying water. This reduction was associated to both direct and indirect impacts of microplastic pollution on the uptake of CO 2 within the marine carbon cycle, by modifying the biogenic composition of the sea's boundary layer with the atmosphere.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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