The Northeast Atlantic is running out of excess carbonate in the horizon of cold-water corals communities

Type Article
Date 2020-09
Language English
Author(s) Fontela Marcos1, 2, Perez Fiz F1, Carracedo LidiaORCID3, Padín Xosé A.1, Velo Antón, García-Ibañez Maribel I.1, 4, Lherminier PascaleORCID3
Affiliation(s) 1 : Instituto de Investigaciones Marinas, IIM-CSIC, 36208, Vigo, Spain
2 : Centre of Marine Sciences (CCMAR), University of Algarve, 8005-139, Faro, Portugal
3 : Ifremer, Univ. Brest, CNRS, IRD, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, 29280, Plouzané, France
4 : Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, UK
Source Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2020-09 , Vol. 10 , N. 1 , P. 14174 (10p.)
DOI 10.1038/s41598-020-71793-2
Abstract

The oceanic uptake of atmospheric carbon dioxide (CO2) emitted by human activities alters the seawater carbonate system. Here, the chemical status of the Northeast Atlantic is examined by means of a high-quality database of carbon variables based on the GO-SHIP A25 section (1997–2018). The increase of atmospheric CO2 leads to an increase in ocean anthropogenic carbon (Cant) and a decrease in carbonate that is unequivocal in the upper and mid-layers (0–2,500 m depth). In the mid-layer, the carbonate content in the Northeast Atlantic is maintained by the interplay between the northward spreading of recently conveyed Mediterranean Water with excess of carbonate and the arrival of subpolar-origin waters close to carbonate undersaturation. In this study we show a progression to undersaturation with respect to aragonite that could compromise the conservation of the habitats and ecosystem services developed by benthic marine calcifiers inhabiting that depth-range, such as the cold-water corals (CWC) communities. For each additional ppm in atmospheric pCO2 the waters surrounding CWC communities lose carbonate at a rate of − 0.17 ± 0.02 μmol kg−1 ppm−1. The accomplishment of global climate policies to limit global warming below 1.5–2 ℃ will avoid the exhaustion of excess carbonate in the Northeast Atlantic.

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How to cite 

Fontela Marcos, Perez Fiz F, Carracedo Lidia, Padín Xosé A., Velo Antón, García-Ibañez Maribel I., Lherminier Pascale (2020). The Northeast Atlantic is running out of excess carbonate in the horizon of cold-water corals communities. Scientific Reports, 10(1), 14174 (10p.). Publisher's official version : https://doi.org/10.1038/s41598-020-71793-2 , Open Access version : https://archimer.ifremer.fr/doc/00646/75822/