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Sub sea surface temperatures in the Polar North Atlantic during the Holocene: Planktic foraminiferal Mg/Ca temperature reconstructions

Aagaard-Sørensen, Steffen ; Husum, Katrine ; Hald, Morten ; Marchitto, Thomas ; Godtliebsen, Fred

Holocene (Sevenoaks), 2014-01, Vol.24 (1), p.93-103 [Periódico revisado por pares]

London, England: SAGE Publications

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  • Título:
    Sub sea surface temperatures in the Polar North Atlantic during the Holocene: Planktic foraminiferal Mg/Ca temperature reconstructions
  • Autor: Aagaard-Sørensen, Steffen ; Husum, Katrine ; Hald, Morten ; Marchitto, Thomas ; Godtliebsen, Fred
  • Assuntos: Foraminifera ; Geofag: 450 ; Geosciences: 450 ; Marine ; Matematikk og Naturvitenskap: 400 ; Mathematics and natural science: 400 ; Neogloboquadrina pachyderma ; Ocean temperature ; Oceanography ; Oceanography: 452 ; Oseanografi: 452 ; Paleoecology ; Studies ; Surface water ; VDP
  • É parte de: Holocene (Sevenoaks), 2014-01, Vol.24 (1), p.93-103
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Holocene sea surface temperatures in the eastern Fram Strait are reconstructed based on Mg/Ca ratios measured on the planktic foraminifer Neogloboquadrina pachyderma (sin). The reconstructed sub sea surface temperatures (sSSTMg/Ca) fluctuate markedly during the earliest Holocene at ~11.7 and 10.5 kyr BP. This is probably in response to the varying presence of sea-ice and deglacial meltwater. Between ~10.5–7.9 kyr BP, the sSSTMg/Ca values are relatively high (~4°C) and more stable reflecting high insolation and intensified poleward advection of Atlantic Water. After 7.9 kyr BP, the sSSTMg/Ca values decline to an average of ~3°C throughout the mid-Holocene. These changes can be attributed to a combined effect of reduced poleward oceanic heat advection and a decline in insolation as well as a gradually increased influence of eastward migrating Arctic Water. The sSSTMg/Ca values increase and vary between 2.1°C and 5.8°C from ~2.7 kyr BP to the present. This warming is in contrast to declining late-Holocene insolation and may instead be explained by factors including increased advection of oceanic heat to the Arctic region possibly insulated beneath a widening freshwater layer in the northern North Atlantic in conjunction with a shift in calcification season and/or depth habitat of N. pachyderma (sin).
  • Editor: London, England: SAGE Publications
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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