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Helena Filipsson, foto Erik Thor

Helena Filipsson

Professor

Helena Filipsson, foto Erik Thor

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

Författare

  • S. Ni
  • N. B. Quintana Krupinski
  • J. Chonewicz
  • J. Groeneveld
  • K. L. Knudsen
  • M. S. Seidenkrantz
  • H. L. Filipsson

Summary, in English

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.

Avdelning/ar

  • MERGE: ModElling the Regional and Global Earth system
  • Kvartärgeologi
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publiceringsår

2021-11-15

Språk

Engelska

Publikation/Tidskrift/Serie

Quaternary Science Reviews

Volym

272

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Geology
  • Climate Research

Nyckelord

  • Benthic foraminifera
  • Hydrography
  • Seasonality
  • The Baltic Sea
  • The Last Interglacial
  • The Skagerrak

Status

Published

Projekt

  • MERGE SP: Proxy-based reconstructions and model simulations of seasonal climate variations during the Last Interglacial in the Baltic Sea
  • Tracing marine hypoxic conditions during warm periods using a microanalytical approach

ISBN/ISSN/Övrigt

  • ISSN: 0277-3791