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  • Barrientos, NataliaStockholms universitet,Institutionen för geologiska vetenskaper (author)

Arctic Ocean benthic foraminifera Mg/Ca ratios and global Mg/Ca-temperature calibrations: New constraints at low temperatures

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • Elsevier BV,2018
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-155082
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-155082URI
  • https://doi.org/10.1016/j.gca.2018.02.036DOI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We explore the use of Mg/Ca ratios in six Arctic Ocean benthic foraminifera species as bottom water palaeothermometers and expand published Mg/Ca-temperature calibrations to the coldest bottom temperatures (<1 °C). Foraminifera were analyzed in surface sediments at 27 sites in the Chukchi Sea, East Siberian Sea, Laptev Sea, Lomonosov Ridge and Petermann Fjord. The sites span water depths of 52–1157 m and bottom water temperatures (BWT) of −1.8 to +0.9 °C. Benthic foraminifera were alive at time of collection, determined from Rose Bengal (RB) staining. Three infaunal and three epifaunal species were abundant enough for Mg/Ca analysis. As predicted by theory and empirical evidence, cold water Arctic Ocean benthic species produce low Mg/Ca ratios, the exception being the porcelaneous species Quinqueloculina arctica. Our new data provide important constraints at the cold end (<1 °C) when added to existing global datasets. The refined calibrations based on the new and published global data appear best supported for the infaunal species Nonionella labradorica (Mg/Ca = 1.325 ± 0.01 × e^(0.065 ± 0.01 × BWT), r2 = 0.9), Cassidulina neoteretis (Mg/Ca = 1.009 ± 0.02 × e^(0.042 ± 0.01 × BWT), r2 = 0.6) and Elphidium clavatum (Mg/Ca = 0.816 ± 0.06 + 0.125 ± 0.05 × BWT, r2 = 0.4). The latter is based on the new Arctic data only. This suggests that Arctic Ocean infaunal taxa are suitable for capturing at least relative and probably semi-quantitative past changes in BWT. Arctic Oridorsalis tener Mg/Ca data are combined with existing O. umbonatus Mg/Ca data from well saturated core-tops from other regions to produce a temperature calibration with minimal influence of bottom water carbonate saturation state (Mg/Ca = 1.317 ± 0.03 × e^(0.102 ± 0.01 BWT), r2 = 0.7). The same approach for Cibicidoides wuellerstorfi yields Mg/Ca = 1.043 ± 0.03 × e^(0.118 ± 0.1 BWT), r2 = 0.4. Mg/Ca ratios of the porcelaneous epifaunal species Q. arctica show a clear positive relationship between Mg/Ca and Δ[CO32−] indicating that this species is not suitable for Mg/Ca-palaeothermometry at low temperatures, but may be useful in reconstructing carbonate system parameters through time.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Lear, Caroline H. (author)
  • Jakobsson, MartinStockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)mjako (author)
  • Stranne, ChristianStockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)chstr (author)
  • O'Regan, MattStockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)more (author)
  • Cronin, Thomas M. (author)
  • Gukov, Aleksandr Y. (author)
  • Coxall, Helen K.Stockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)hcoxa (author)
  • Stockholms universitetInstitutionen för geologiska vetenskaper (creator_code:org_t)

Related titles

  • In:Geochimica et Cosmochimica Acta: Elsevier BV236, s. 240-2590016-70371872-9533

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