Mid-Holocene reinforcement of North Atlantic atmospheric circulation variability from a western Baltic lake sediment record
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Published:2023-01-26
Issue:1
Volume:19
Page:233-248
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ISSN:1814-9332
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Container-title:Climate of the Past
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language:en
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Short-container-title:Clim. Past
Author:
Czymzik MarkusORCID, Tjallingii RikORCID, Plessen Birgit, Feldens PeterORCID, Theuerkauf MartinORCID, Moros Matthias, Schwab Markus J., Nantke Carla K. M., Pinkerneil Silvia, Brauer Achim, Arz Helge W.
Abstract
Abstract. Knowledge about the timing, amplitude and spatial gradients of
Holocene environmental variability in the circum-Baltic region is key to
understanding its responses to ongoing climate change. Based on a multi-dating
and proxy approach, we reconstruct changes in productivity using total organic carbon (TOC)
contents in sediments of Lake Kälksjön (KKJ) from west–central
Sweden spanning the last 9612 (+255/-114) years. An exception is the
period from 1878 CE 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 northwestern Europe, likely triggered by
the coinciding increase in Northern Hemisphere winter insolation. Decadal to
centennial periods of higher productivity in KKJ tend to correspond to
warmer winters during a more positive North Atlantic Oscillation (NAO)
polarity, as reconstructed for the last 8000 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.
Funder
Deutsche Forschungsgemeinschaft Leibniz-Gemeinschaft
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
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