FN Archimer Export Format PT J TI Hydrothermal vents trigger massive phytoplankton blooms in the Southern Ocean BT AF 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 AS 1:1,2;2:1,3;3:4;4:4;5:4;6:1;7:5;8:6;9:7;10:8;11:2;12:1; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:; C1 Sorbonne Université & CNRS, Laboratoire d’Océanographie de Villefranche (LOV), 181 Chemin du Lazaret, F-06230, Villefranche-sur-mer, France Department of Earth System Science, Stanford University, Stanford, CA, 94305, USA akuvik Joint International Laboratory, Laval University (Canada) - CNRS (France), Département de biologie et Québec-Océan, Université Laval, Québec, Québec, G1V 0A6, Canada Sorbonne Université, CNRS, IRD, MNHN, Laboratoire d’Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN-IPSL), F-75005, Paris, France Sorbonne Université & CNRS, Laboratoire d’Océanographie Microbienne (LOMIC), Observatoire Océanologique, F-66650, Banyuls/mer, France Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, UK Alfred Wegener Institute, Helmholtz-Center for Polar- and Marine Research, Am Alten Hafen 26, 27568, Bremerhaven, Germany LEGOS (Université de Toulouse, CNRS, CNES, IRD, UPS), 14 avenue Edouard Belin, 31400, Toulouse, France C2 UNIV PARIS 06, FRANCE UNIV STANFORD, USA UNIV LAVAL, CANADA UNIV PARIS 06, FRANCE UNIV PARIS 06, FRANCE UNIV LIVERPOOL, UK INST A WEGENER, GERMANY UNIV TOULOUSE, FRANCE IN DOAJ IF 12.121 TC 74 UR https://archimer.ifremer.fr/doc/00501/61310/64869.pdf https://archimer.ifremer.fr/doc/00501/61310/64870.pdf https://archimer.ifremer.fr/doc/00501/61310/64871.pdf LA English DT Article CR CIVA 2 - MD 103 MD 205 / SOCLIM BO Marion Dufresne AB 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. PY 2019 PD JUL SO Nature Communications SN 2041-1723 PU Springer Science and Business Media LLC VL 10 IS 1 UT 000470083300001 DI 10.1038/s41467-019-09973-6 ID 61310 ER EF