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Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cp-2017-160
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
09 Jan 2018
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Climate of the Past (CP).
Tracing winter temperatures over the last two millennia using a NE Atlantic coastal record
Irina Polovodova Asteman1, Helena L. Filipsson2, and Kjell Nordberg1 1Department of Marine Sciences, University of Gothenburg, Carl Skottbergsgata 22B, 41319 Gothenburg, Sweden
2Department of Geology, University of Lund, Sölvegatan 12, 22362 Lund, Sweden
Abstract. We present 2500 years of reconstructed winter temperatures by using a fjord sediment archive from the NE Atlantic. The study is based on ca. 8-m long sediment core from Gullmar Fjord (Sweden), dated by 210Pb and AMS 14C and analysed for stable oxygen isotopes (δ18O) measured on shallow infaunal benthic foraminiferal species Cassidulina laevigata. The bottom water temperatures (BWTs), calculated by using a palaeotemperature equation of McCorkle et al. (1997), range between 2.7–7.8 °C and are within the annual temperature variability, instrumentally recorded in the deep fjord basin since the 1890s. The record demonstrates a warming during the Roman Warm Period (~ 350 BCE–450 CE), variable bottom water temperatures during the Dark Ages (~ 450–850 CE), positive bottom water temperature anomalies during the Viking Age/Medieval Climate Anomaly (~ 850–1350 CE) and a long-term cooling with distinct multidecadal variability during the Little Ice Age (~ 1350–1850 CE). The fjord BWT record also picks up the contemporary warming of the 20th century, which does not stand out in the 2500-year perspective and is of the same magnitude as the Roman Warm Period and the Medieval Climate Anomaly.
Citation: Polovodova Asteman, I., Filipsson, H. L., and Nordberg, K.: Tracing winter temperatures over the last two millennia using a NE Atlantic coastal record, Clim. Past Discuss., https://doi.org/10.5194/cp-2017-160, in review, 2018.
Irina Polovodova Asteman et al.
Irina Polovodova Asteman et al.
Irina Polovodova Asteman et al.

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Short summary
We present 2500 yrs of winter temperatures, using a sediment core from Gullmar Fjord, analysed for oxygen isotopes in microfossils to reconstruct historical temperatures. They range between the annual temperature variability, recorded since the 1890s. Results demonstrate the warm Roman and Medieval periods, the cold Little Ice Age, as well as the warming of the 20th century, which does not stand out in the 2500-year perspective. It is of the same magnitude as the Roman and Medieval warm periods.
We present 2500 yrs of winter temperatures, using a sediment core from Gullmar Fjord, analysed...
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