Cristin-resultat-ID: 2052961
Sist endret: 27. oktober 2022, 16:18
NVI-rapporteringsår: 2022
Resultat
Vitenskapelig artikkel
2022

Paleoceanography of the Northwestern Greenland Sea and Return Atlantic Current evolution, 35–4 kyr BP

Bidragsytere:
  • Dhanushka Devendra
  • Magdalena Łącka
  • Maciej M. Telesiński
  • Tine Lander Rasmussen
  • Kamila Sztybor og
  • Marek Zajączkowski

Tidsskrift

Global and Planetary Change
ISSN 0921-8181
e-ISSN 1872-6364
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2022
Publisert online: 2022
Trykket: 2022
Volum: 217
Artikkelnummer: 103947
Open Access

Importkilder

Scopus-ID: 2-s2.0-85138450828

Beskrivelse Beskrivelse

Tittel

Paleoceanography of the Northwestern Greenland Sea and Return Atlantic Current evolution, 35–4 kyr BP

Sammendrag

The flow of the Atlantic Water (AW) via the Return Atlantic Current (RAC) regulates the oceanographical conditions in the Northwestern (NW) Greenland Sea in the Fram Strait. As the intensity of the RAC might significantly influence both deep-water formation in the area and the stability of the Northeast Greenland Ice Sheet (NE GIS), knowledge of its variability in the past is important. Here we present a reconstruction of the paleoceanographic forcing of the AW on climatic conditions and associated environmental changes in the NW Greenland Sea by means of foraminiferal assemblages, stable (oxygen and carbon) isotopes, and various sedimentological parameters from sediment core GR02-GC retrieved from NE Greenland continental slope (1170 m water depth). Our data indicate an almost continuous presence of AW in the NW Greenland Sea during the last 35 kyr BP. Two peaks of low planktic δ18O values at ~34.5 and 33 kyr BP are interpreted as meltwater signals associated with warm AW-induced melting of the adjacent NE GIS. The NE GIS advanced between 32 and 29 kyr BP, resulting in reduced meltwater influx to the NW Greenland Sea. Increased iceberg calving and melting after 29 kyr BP, were probably linked to surface warming and glacier advance to the shelf-break lasting until 23.5 kyr BP. During the Last Glacial Maximum, the extensive sea ice cover was associated with the presence of subsurface AW at the study site. During the Bølling–Allerød (B/A, ~14.6–12.7 kyr BP) strong melting of glaciers and sea ice was probably caused by the combined effect of the B/A warming and the flow of warm AW. The RAC was weakened during the Younger Dryas (~12.8–11.7 kyr BP), which reduced the advection of warm AW to the NW Greenland Sea. After 11.7 kyr BP, the RAC reached its modern strength, whereas, during the Holocene Thermal Maximum, it reached its maximum strength for the study period. In addition, short-term weakening of AW inflow to the core site was observed, especially at 10.5, 8.5, and 5.8 kyr BP

Bidragsytere

Dhanushka Devendra

  • Tilknyttet:
    Forfatter
    ved Polska Akademia Nauk

Magdalena Łącka

  • Tilknyttet:
    Forfatter
    ved Polska Akademia Nauk

Maciej M. Telesiński

  • Tilknyttet:
    Forfatter
    ved Polska Akademia Nauk

Tine Lander Rasmussen

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

Kamila Sztybor

  • Tilknyttet:
    Forfatter
    ved Akvaplan Niva AS
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