15 Aug 2022
15 Aug 2022
Status: this preprint is open for discussion and under review for Climate of the Past (CP).

Mid-Holocene reinforcement of North Atlantic atmospheric circulation variability from a western Baltic lake sediment record

Markus Czymzik1, Rik Tjallingii2, Birgit Plessen2, Peter Feldens1, Martin Theuerkauf3, Matthias Moros1, Markus J. Schwab2, Carla K. M. Nantke1, Silvia Pinkerneil2, Achim Brauer2,4, and Helge W. Arz1 Markus Czymzik et al.
  • 1Leibniz Institute for Baltic Sea Research Warnemünde (IOW) - Marine Geology, Rostock, Germany
  • 2GFZ German Research Centre for Geosciences - Climate Dynamics and Landscape Evolution, Potsdam, Germany
  • 3University of Greifswald - Institute of Botany and Landscape Ecology, Greifswald, Germany
  • 4University of Potsdam - Institute of Geosciences, Potsdam, Germany

Abstract. Knowledge about timing, amplitude and spatial gradients of Holocene environmental variability in the Circum-Baltic region is key to understand its responses to ongoing climate change. Based on a multi-dating and proxy approach, we reconstruct changes in productivity from TOC contents in sediments of Lake Kälksjön (KKJ) in west-central Sweden spanning the last 9612 (+255/-144) years. An exception is the period from AD 1878 until today, in which sedimentation was dominated by anthropogenic lake level lowering and land use. In-lake productivity was higher during periods of warmer winters with shortened ice cover and prolonged growing seasons. A multi-millennial increase in productivity throughout the last ~9600 years is associated with progressively warmer winters in north-western Europe, likely triggered by the coinciding increase in Northern Hemisphere winter insolation. Decadal to centennial periods of higher productivity in KKJ correspond to warmer winters during a more positive North Atlantic Oscillation (NAO) polarity, as reconstructed for the last 5200 years. In consequence, we assume our decadal to centennial productivity record from KKJ sediments for the complete ~9600 years to provide a qualitative record of NAO polarity. A shift towards higher productivity variability at ~5450 cal. a BP is hypothesized to reflect a reinforcement of NAO-like atmospheric circulation variability, possibly driven by more vigorous changes in North Atlantic deep water formation.

Markus Czymzik et al.

Status: open (until 14 Oct 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-582', Anonymous Referee #1, 18 Sep 2022 reply
    • EC1: 'Reply on RC1', Denis-Didier Rousseau, 18 Sep 2022 reply
  • RC2: 'Comment on egusphere-2022-582', Anonymous Referee #2, 20 Sep 2022 reply

Markus Czymzik et al.

Markus Czymzik et al.


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Short summary
Productivity increases in Lake Kälksjön sediments are likely driven by the progressive millennial-scale winter warming in north-western Europe, following the increasing Northern Hemisphere winter insolation, and decadal to centennial periods of a more positive NAO polarity. Strengthened productivity variability since ~5450 cal. a BP is hypothesized to reflect a reinforcement of NAO-like atmospheric circulation.