Hydrothermal vents trigger massive phytoplankton blooms in the Southern Ocean

Type Article
Date 2019-06
Language English
Author(s) Ardyna Mathieu1, 2, Lacour Léo1, 3, Sergi Sara4, D’ovidio Francesco4, Sallée Jean-Baptiste4, Rembauville Mathieu1, Blain Stéphane5, Tagliabue Alessandro6, Schlitzer Reiner7, Jeandel Catherine8, Arrigo Kevin Robert2, Claustre HervéORCID1
Affiliation(s) 1 : Sorbonne Université & CNRS, Laboratoire d’Océanographie de Villefranche (LOV), 181 Chemin du Lazaret, F-06230, Villefranche-sur-mer, France
2 : Department of Earth System Science, Stanford University, Stanford, CA, 94305, USA
3 : akuvik Joint International Laboratory, Laval University (Canada) - CNRS (France), Département de biologie et Québec-Océan, Université Laval, Québec, Québec, G1V 0A6, Canada
4 : Sorbonne Université, CNRS, IRD, MNHN, Laboratoire d’Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN-IPSL), F-75005, Paris, France
5 : Sorbonne Université & CNRS, Laboratoire d’Océanographie Microbienne (LOMIC), Observatoire Océanologique, F-66650, Banyuls/mer, France
6 : Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, UK
7 : Alfred Wegener Institute, Helmholtz-Center for Polar- and Marine Research, Am Alten Hafen 26, 27568, Bremerhaven, Germany
8 : LEGOS (Université de Toulouse, CNRS, CNES, IRD, UPS), 14 avenue Edouard Belin, 31400, Toulouse, France
Source Nature Communications (2041-1723) (Springer Science and Business Media LLC), 2019-06 , Vol. 10 , N. 1 , P. 2451 (8p.)
DOI 10.1038/s41467-019-09973-6
WOS© Times Cited 68
Abstract

Hydrothermal activity is significant in regulating the dynamics of trace elements in the ocean. Biogeochemical models suggest that hydrothermal iron might play an important role in the iron-depleted Southern Ocean by enhancing the biological pump. However, the ability of this mechanism to affect large-scale biogeochemistry and the pathways by which hydrothermal iron reach the surface layer have not been observationally constrained. Here we present the first observational evidence of upwelled hydrothermally influenced deep waters stimulating massive phytoplankton blooms in the Southern Ocean. Captured by profiling floats, two blooms were observed in the vicinity of the Antarctic Circumpolar Current, downstream of active hydrothermal vents along the Southwest Indian Ridge. These hotspots of biological activity are supported by mixing of hydrothermally sourced iron stimulated by flow-topography interactions. Such findings reveal the important role of hydrothermal vents on surface biogeochemistry, potentially fueling local hotspot sinks for atmospheric CO2 by enhancing the biological pump.

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Ardyna Mathieu, Lacour Léo, Sergi Sara, D’ovidio Francesco, Sallée Jean-Baptiste, Rembauville Mathieu, Blain Stéphane, Tagliabue Alessandro, Schlitzer Reiner, Jeandel Catherine, Arrigo Kevin Robert, Claustre Hervé (2019). Hydrothermal vents trigger massive phytoplankton blooms in the Southern Ocean. Nature Communications, 10(1), 2451 (8p.). Publisher's official version : https://doi.org/10.1038/s41467-019-09973-6 , Open Access version : https://archimer.ifremer.fr/doc/00501/61310/