Cristin-resultat-ID: 1697881
Sist endret: 25. juni 2019, 12:34
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig artikkel
2019

Deep ocean 14C ventilation age reconstructions from the Arctic Mediterranean reassessed

Bidragsytere:
  • Mohamed Ezat
  • Tine Lander Rasmussen
  • Luke C. Skinner og
  • Katarzyna Zamelczyk

Tidsskrift

Earth and Planetary Science Letters
ISSN 0012-821X
e-ISSN 1385-013X
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2019
Publisert online: 2019
Trykket: 2019
Volum: 518
Sider: 67 - 75
Open Access

Importkilder

Scopus-ID: 2-s2.0-85065541967

Beskrivelse Beskrivelse

Tittel

Deep ocean 14C ventilation age reconstructions from the Arctic Mediterranean reassessed

Sammendrag

The present-day ocean ventilation in the Arctic Mediterranean (Nordic Seas and Arctic Ocean), via transformation of northward inflowing warm Atlantic surface water into cold deep water, affects regional climate, atmospheric circulation and carbon storage in the deep ocean. Here we study the glacial evolution of the Arctic Mediterranean circulation and its influence on glacial climate using radiocarbon reservoir-age reconstructions on deep-sea cores from the Fram Strait that cover the late glacial period (33,000–20,000 yr ago; 33–20 ka). Our results show high Benthic-Planktic 14C age differences of ∼1500 14C years 33–26.5 ka suggesting significant water column stratification between ∼100–2600 m water depth, and reduction and/or shoaling of deep-water formation. This phase was followed by break-up of the stratification during the Last Glacial Maximum (LGM; 26–20 ka), with Benthic-Planktic 14C age differences of ∼250 14C years, likely due to enhanced upwelling. These ocean circulation changes potentially contributed to the final intensification phase of glaciation via positive cryosphere-atmosphere-ocean circulation-carbon cycle feedbacks. Our data also do not support ‘extreme aging’ of >6000 14C years in the deep Arctic Mediterranean, and appear to rule out the proposed outflow of very old Arctic Ocean water to the Nordic Seas during the LGM and to the subpolar North Atlantic Ocean during the deglacial period.

Bidragsytere

Mohamed Mahmoud Ezat Ahmed Mohamed

Bidragsyterens navn vises på dette resultatet som Mohamed Ezat
  • Tilknyttet:
    Forfatter
    ved Egypt
  • Tilknyttet:
    Forfatter
    ved University of Cambridge
  • Tilknyttet:
    Forfatter
    ved Centre for Arctic Gas Hydrate, Environment and Climate ved UiT Norges arktiske universitet

Tine Lander Rasmussen

  • Tilknyttet:
    Forfatter
    ved Centre for Arctic Gas Hydrate, Environment and Climate ved UiT Norges arktiske universitet

Luke C. Skinner

  • Tilknyttet:
    Forfatter
    ved University of Cambridge

Katarzyna Agnieszka Zamelczyk

Bidragsyterens navn vises på dette resultatet som Katarzyna Zamelczyk
  • Tilknyttet:
    Forfatter
    ved Centre for Arctic Gas Hydrate, Environment and Climate ved UiT Norges arktiske universitet
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