Threatened species drive the strength of the carbonate pump in the northern Scotia Sea

Manno, Clara ORCID:; Giglio, F.; Stowasser, Gabriele ORCID:; Fielding, Sophie ORCID:; Enderlein, Peter; Tarling, Geraint ORCID: 2018 Threatened species drive the strength of the carbonate pump in the northern Scotia Sea. Nature Communications, 9, 4592. 7, pp.

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The efficiency of deep-ocean CO2 sequestration is regulated by the relative balance between inorganic and organic carbon export respectively acting through the biological carbon pump (BCP) and the carbonate counter pump (CCP). The composition and abundance of calcifying species in the prevailing oceanic plankton community plays a major role in driving the CCP. Here we assess the role of these calcifying organisms in regulating the strength of the CCP in a Southern Ocean region (northern Scotia Sea) known to be a major hotspot for the drawdown of atmospheric CO2. We show that, when shelled pteropods dominate the calcifying community, the total annual reduction of CO2 transferred to the deep ocean doubles (17%) compared to when other plankton calcifiers dominate (3–9%). Furthermore, predation enhances their contribution through the removal of organic soft tissue. Pteropods are threatened in polar regions by ocean warming and acidification. We determine that their potential decline would have major implications to the comparative strengths of the BCP and CCP.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 20411723
NORA Subject Terms: Chemistry
Date made live: 08 Nov 2018 14:34 +0 (UTC)

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