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Seasonal climate variations in the Baltic Sea during the Last Interglacial based on foraminiferal geochemistry

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  • S. Ni, Lund University, Sverige
  • N. B. Quintana Krupinski, Lund University, Sverige
  • J. Chonewicz, Lund University, Sverige
  • J. Groeneveld, University of Bremen, University of Hamburg, Tyskland
  • K. L. Knudsen
  • M. S. Seidenkrantz
  • H. L. Filipsson, Lund University, Sverige

Climate during the Last Interglacial period (LIG, Marine Isotope Stage 5e) was on average warmer than the present, with a higher global sea level but also more unstable conditions. Today, the Baltic Sea interacts strongly with conditions in the North Atlantic region, and this interaction was likely even stronger during the LIG. We here present a reconstruction of seawater conditions during the LIG based on benthic foraminiferal geochemistry (stable isotopes and trace elements) and compare these records with modern marine monitoring data to evaluate seasonal hydrographic conditions in the western and southern Baltic Sea during the first half of the LIG (130–123 ka BP). Our reconstructions reflect the evolution of seasonal temperature and salinity, rather than annual mean conditions. The spring LIG bottom water temperatures in the Skagerrak and Kattegat were ∼2–3 °C higher compared to the modern spring bottom water temperatures. During the LIG, there was an increase in seasonality in bottom water temperature (progressively warmer summers and cooler springs) in the southern Baltic Sea, which can be linked to seasonal insolation changes. Moreover, our data suggest a decreased gradient of bottom water salinity along a transect through the Skagerrak-Kattegat-Danish Straits-southern Baltic Sea, supporting previous investigations inferring a stronger ocean-water influx into the Baltic Sea during the LIG than at present.

OriginalsprogEngelsk
Artikelnummer107220
TidsskriftQuaternary Science Reviews
Vol/bind272
ISSN0277-3791
DOI
StatusUdgivet - 15 nov. 2021

Bibliografisk note

Funding Information:
We thank the Crafoord Foundation , Kungliga Fysiografiska Sällskapet i Lund, Linnaeus centre of excellence “Lund University Centre for studies of Carbon Cycle and Climate Interactions (LUCCI)”, and the Centre for Environmental and Climate Research ( CEC ), Lund University, Sweden, for funding. We also acknowledge the Danish Council for Independent Research (grants no. 7014- 00113 B (G-Ice) and 0135–00165 B (GreenShelf) to MSS) and the project has also received funding from the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 869383 (ECOTIP) (MSS). The SMHI, Sweden, hydrographic data collection is organized by the environmental monitoring program and funded by the SwAM. We thank Jacob Carstensen for helpful suggestions regarding hydrographic databases. The foraminifera used in our analyses were from samples originally prepared in the laboratory by Svend Meldgaard Christiansen † at Aarhus University, and we also thank Katrine Juul Andresen, Aarhus University, for translating UTM coordinated to longitude-latitude positions.

Funding Information:
We thank the Crafoord Foundation, Kungliga Fysiografiska S?llskapet i Lund, Linnaeus centre of excellence ?Lund University Centre for studies of Carbon Cycle and Climate Interactions (LUCCI)?, and the Centre for Environmental and Climate Research (CEC), Lund University, Sweden, for funding. We also acknowledge the Danish Council for Independent Research (grants no. 7014- 00113 B (G-Ice) and 0135?00165 B (GreenShelf) to MSS) and the project has also received funding from the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 869383 (ECOTIP) (MSS). The SMHI, Sweden, hydrographic data collection is organized by the environmental monitoring program and funded by the SwAM. We thank Jacob Carstensen for helpful suggestions regarding hydrographic databases. The foraminifera used in our analyses were from samples originally prepared in the laboratory by Svend Meldgaard Christiansen ? at Aarhus University, and we also thank Katrine Juul Andresen, Aarhus University, for translating UTM coordinated to longitude-latitude positions.

Publisher Copyright:
© 2021 The Authors

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