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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 7
Clim. Past, 14, 1097-1118, 2018
https://doi.org/10.5194/cp-14-1097-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Clim. Past, 14, 1097-1118, 2018
https://doi.org/10.5194/cp-14-1097-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 25 Jul 2018

Research article | 25 Jul 2018

Tracing winter temperatures over the last two millennia using a north-east Atlantic coastal record

Irina Polovodova Asteman1,2, Helena L. Filipsson3, and Kjell Nordberg1 Irina Polovodova Asteman et al.
  • 1Department of Marine Sciences, University of Gothenburg, Carl Skottsbergsgata 22B, 41319 Gothenburg, Sweden
  • 2Currently at: Marin Mätteknik (MMT) Sweden AB, Sven Källfelts Gata 11, 42671, Gothenburg, Sweden
  • 3Department of Geology, University of Lund, Sölvegatan 12, 22362 Lund, Sweden

Abstract. We present 2500 years of reconstructed bottom water temperatures (BWT) using a fjord sediment archive from the north-east Atlantic region. The BWT represent winter conditions due to the fjord hydrography and the associated timing and frequency of bottom water renewals. The study is based on a ca. 8m long sediment core from Gullmar Fjord (Sweden), which was dated by 210Pb and AMS 14C and analysed for stable oxygen isotopes (δ18O) measured on shallow infaunal benthic foraminiferal species Cassidulina laevigata d'Orbigny 1826. The BWT, calculated using the palaeotemperature equation from McCorkle et al. (1997), range between 2.7 and 7.8°C and are within the annual temperature variability that has been instrumentally recorded in the deep fjord basin since the 1890s. The record demonstrates a warming during the Roman Warm Period ( ∼ 350BCE–450CE), variable BWT during the Dark Ages ( ∼ 450–850CE), positive BWT anomalies during the Viking Age/Medieval Climate Anomaly ( ∼ 850–1350CE) and a long-term cooling with distinct multidecadal variability during the Little Ice Age ( ∼ 1350–1850CE). The fjord BWT record also picks up the contemporary warming of the 20th century (presented here until 1996), 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.

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We present 2500 years of winter temperatures, using a sediment record from Gullmar Fjord analyzed for stable oxygen isotopes in benthic foraminifera. Reconstructed temperatures are within the annual temperature variability recorded in the fjord since the 1890s. Results show the warm Roman and Medieval periods and the cold Little Ice Age. The record also shows the recent warming, which does not stand out in the 2500-year perspective and is comparable to the Roman and Medieval climate anomalies.
We present 2500 years of winter temperatures, using a sediment record from Gullmar Fjord...
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