Deciphering Paleoceanographic Shifts Inferred from the Foraminiferal Record of the Western Svalbard Slope (Bellsund Drift) over the Past Century

The objective of this study was to reconstruct the last century’s climatic oscillations in the Arctic region around the Fram Strait using high-resolution analysis of foraminiferal assemblages as proxies for surface and deep-water mass properties. In this area, warm Atlantic water masses are advected...

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Vydáno v:Journal of marine science and engineering Ročník 12; číslo 4; s. 559
Hlavní autoři: Gamboa Sojo, Viviana M., Morigi, Caterina, Langone, Leonardo, Lucchi, Renata G.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Basel MDPI AG 01.04.2024
Témata:
Analysis
Arctic zone
Benthos
Bottom water
Climate cycles
Current velocity
Deep water
Deep-water masses
Foraminifera
Grain size
Ice environments
Inflow
last century
Oscillations
planktic and benthic foraminifera
Satellites
Sea ice
Sediments
Svalbard
Temperature
Thermohaline circulation
Water inflow
Water masses
Arctic Ocean
Norway
Svalbard
Arctic region
Greenland
Fram Strait
ISSN:2077-1312, 2077-1312
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Popis
Shrnutí:The objective of this study was to reconstruct the last century’s climatic oscillations in the Arctic region around the Fram Strait using high-resolution analysis of foraminiferal assemblages as proxies for surface and deep-water mass properties. In this area, warm Atlantic water masses are advected to the Arctic Ocean through the West Spitsbergen Current, representing the northernmost tip of the Global Thermohaline Circulation. The interaction between the cold Arctic and the warm Atlantic water masses significantly influences the entire foraminiferal community. Planktic species such as Neogloboquadrina pachyderma and Turborotalita quinqueloba are respectively used as indicators of cold Arctic water and warm Atlantic water masses. Among the main benthic species, Cibicidoides wuellerstorfi, Epistominella exigua, and Oridorsalis tener stand out, serving as proxies for the bottom water mass current velocity and paleoproductivity. The paleoenvironmental reconstruction obtained with the foraminiferal assemblages, together with data from satellite monitoring of the sea ice extent and the long-term record of the annual temperature of the West Spitsbergen Current measured over the last 50 years, support the evidence of a progressively rising heat influx into the Arctic Ocean due to an increasing Atlantic water inflow, forcing the consequent decay of the sea ice extent.
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ISSN:2077-1312
2077-1312
DOI:10.3390/jmse12040559