January 1, 2020 Journal article Open Access

Fossile, Eleonora; Nardelli, Maria Pia; Jouini, Arbia; LANSARD, Bruno; Pusceddu, Antonio; Moccia, Davide; Michel, Elisabeth; Peron, Olivier; Howa, Hélène; Mojtahid, Meryem

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{
  "DOI": "10.5194/bg-17-1933-2020", 
  "abstract": "Abstract. The rapid response of benthic foraminifera to environmental factors\n(e.g. organic matter quality and quantity, salinity, pH) and their\nhigh fossilisation potential make them promising bio-indicators for\nthe intensity and recurrence of brine formation in Arctic seas. Such\nan approach, however, requires a\u00a0thorough knowledge of their modern\necology in such extreme settings. To this aim, seven stations along\na\u00a0north\u2013south transect across the Storfjorden (Svalbard archipelago) have been\nsampled using an interface multicorer. This fjord is an area of\nintense sea ice formation characterised by the production of\nbrine-enriched shelf waters (BSW) as a\u00a0result of a\u00a0recurrent\nlatent-heat polynya. Living (rose bengal-stained) foraminiferal\nassemblages were analysed together with geochemical and\nsedimentological parameters in the top 5\u2009cm of the\nsediment. Three major biozones were distinguished. (i)\u00a0The \"inner\nfjord\" zone, dominated by typical glacier proximal calcareous species, which\nopportunistically respond to fresh organic matter inputs. (ii)\u00a0The\n\"deep basins and sill\" zone, characterised by glacier distal agglutinated\nfauna; these are either dominant because of the mostly\nrefractory nature of organic matter and/or the brine persistence that\nhampers the growth of calcareous species and/or causes their\ndissolution. (iii)\u00a0The \"outer fjord\" zone, characterised by typical North\nAtlantic species due to the intrusion of the North Atlantic water in\nthe Storfjordrenna. The stressful conditions present in the deep\nbasins and sill (i.e. acidic waters and low food quality) result in\na\u00a0high agglutinated\u2009\u2215\u2009calcareous ratio (A\u2215C). This supports the\npotential use of the A\u2215C ratio\u00a0as\u00a0a\u00a0proxy for brine persistence and\noverflow in Storfjorden.", 
  "author": [
    {
      "family": "Fossile, Eleonora"
    }, 
    {
      "family": "Nardelli, Maria Pia"
    }, 
    {
      "family": "Jouini, Arbia"
    }, 
    {
      "family": "LANSARD, Bruno"
    }, 
    {
      "family": "Pusceddu, Antonio"
    }, 
    {
      "family": "Moccia, Davide"
    }, 
    {
      "family": "Michel, Elisabeth"
    }, 
    {
      "family": "Peron, Olivier"
    }, 
    {
      "family": "Howa, H\u00e9l\u00e8ne"
    }, 
    {
      "family": "Mojtahid, Meryem"
    }
  ], 
  "id": "29333", 
  "issued": {
    "date-parts": [
      [
        2020, 
        1, 
        1
      ]
    ]
  }, 
  "language": "eng", 
  "note": "", 
  "title": "Benthic foraminifera as tracers of brine production in the Storfjorden \"sea ice factory\"", 
  "type": "article-journal"
}