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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 6 | Copyright
Clim. Past, 12, 1297-1312, 2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 03 Jun 2016

Research article | 03 Jun 2016

1200 years of warm-season temperature variability in central Scandinavia inferred from tree-ring density

Peng Zhang1, Hans W. Linderholm1, Björn E. Gunnarson2, Jesper Björklund3, and Deliang Chen1 Peng Zhang et al.
  • 1Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden
  • 2Bolin Centre for Climate Research, Department of Physical Geography, Stockholm University, Stockholm, Sweden
  • 3Swiss Federal Research Institute WSL, Birmensdorf, Switzerland

Abstract. Despite the emergence of new high-resolution temperature reconstructions around the world, only a few cover the Medieval Climate Anomaly (MCA). Here we present C-Scan, a new Scots pine tree-ring density-based reconstruction of warm-season (April–September) temperatures for central Scandinavia back to 850CE, extending the previous reconstruction by 250years. C-Scan is based on samples collected in a confined mountain region, adjusted for their differences in altitude and local environment, and standardised using the new RSFi algorithm to preserve low-frequency signals. In C-Scan, the warm peak of MCA occurs ca. 1000–1100CE, and the Little Ice Age (LIA) between 1550 and 1900CE. Moreover, during the last millennium the coldest decades are found around 1600CE, and the warmest 10 and 30years occur in the most recent century. By comparing C-Scan with other millennium-long temperature reconstructions from Fennoscandia, regional differences in multi-decadal temperature variability, especially during the warm period of the last millennium are revealed. Although these differences could be due to methodological reasons, they may indicate asynchronous warming patterns across Fennoscandia. Further investigation of these regional differences and the reasons and mechanisms behind them are needed.

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Short summary
We present C-Scan, a new Scots pine tree-ring density based reconstruction of warm-season (April-September) temperatures for central Scandinavia back to 850 CE, extending the previous reconstruction by 250 years. Our reconstruction indicates that the warm-season warmth during a relatively-warm period of last millennium is not so pronounced in central Scandinavia, which adds further detail to our knowledge about the spatial pattern of surface air temperature on the regional scale.
We present C-Scan, a new Scots pine tree-ring density based reconstruction of warm-season...