FN Archimer Export Format PT J TI Benthic foraminifera as tracers of brine production in Storfjorden “sea ice factory” BT AF Fossile, Eleonore Nardelli, Maria Pia Jouini, Arbia Lansard, Bruno Pusceddu, Antonio Moccia, Davide Michel, Elisabeth Péron, Olivier Howa, Hélène Mojtahid, Meryem AS 1:1;2:1;3:1;4:2;5:3;6:3;7:2;8:4;9:1;10:1; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:; C1 LPG-BIAF UMR 6112, Univerité d’Angers, CNRS, UFR Sciences, 2 bd Lavoisier 49045, Angers Cedex 01, France LSCE, UMR 8212, IPSL-CEA-CNRS-UVSQ-Université Paris Saclay, 91198 Gif-sur-Yvette, France Department of Life and Environmental Sciences, University of Cagliari, 09126 Cagliari, Italy SUBATECH, UMR 6457, CNRS-Université de Nantes, 4 rue A. Kastler, 44307 Nantes, France C2 UNIV ANGERS, FRANCE LSCE, FRANCE UNIV CAGLIARI, ITALY UNIV NANTES, FRANCE IN DOAJ TC 0 UR https://archimer.ifremer.fr/doc/00599/71122/69424.pdf https://archimer.ifremer.fr/doc/00599/71122/69425.pdf https://archimer.ifremer.fr/doc/00599/71122/73590.pdf https://archimer.ifremer.fr/doc/00599/71122/73591.pdf LA English DT Article CR STEP 2016 BO L'Atalante AB The rapid response of benthic foraminifera to environmental factors (e.g., organic matter quality and quantity, salinity, pH) and their high fossilisation potential make them promising bio-indicators for the intensity and recurrence of brine formation in Arctic seas. Such approach, however, requires a thorough knowledge of their modern ecology in such extreme settings. To this aim, seven stations along a N–S transect across the Storfjorden (Svalbard archipelago) have been sampled using an interface multicorer. This fjord is an area of intense sea ice formation characterised by the production of Brine-enriched Shelf Waters (BSW) as a result of a recurrent latent-heat polynya. Living (Rose Bengal stained) foraminiferal assemblages were analysed together with geochemical and sedimentological parameters in the top five centimetres of the sediment. Three major biozones were distinguished: (i) the inner fjord dominated by typical glacier proximal calcareous species which opportunistically respond to fresh organic matter inputs; (ii) the deep basins and sill characterised by glacier distal agglutinated faunas. These latter are either dominant because of the mostly refractory nature of organic matter and/or the brine persistence that hampers the growth of calcareous species and/or causes their dissolution. (iii) The outer fjord characterised by typical North Atlantic species due to the intrusion of the North Atlantic water in the Storfjordrenna. The stressful conditions present in the deep basins and sill (i.e. acidic waters and low food quality) result in a high agglutinated/calcareous ratio (A / C). This supports the potential use of the A / C ratio as a proxy for brine persistence and overflow in Storfjorden. PY 2020 SO Biogeosciences SN 1726-4189 PU Copernicus GmbH VL 17 IS 7 DI 10.5194/bg-2019-405 ID 71122 ER EF