Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
Clim. Past, 13, 1-15, 2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
04 Jan 2017
Spring temperature variability over Turkey since 1800 CE reconstructed from a broad network of tree-ring data
Nesibe Köse1, H. Tuncay Güner1, Grant L. Harley2, and Joel Guiot3 1Faculty of Forestry, Forest Botany Department, Istanbul University, 34473 Bahçeköy-Istanbul, Turkey
2Department of Geography and Geology, University of Southern Mississippi, Hattiesburg, Mississippi 39406, USA
3Aix-Marseille Université, CNRS, IRD, CEREGE UM34, ECCOREV, 13545 Aix-en-Provence, France
Abstract. The meteorological observational period in Turkey, which starts ca. 1930 CE, is too short for understanding long-term climatic variability. Tree rings have been used intensively as proxy records to understand summer precipitation history of the region, primarily because they have a dominant precipitation signal. Yet, the historical context of temperature variability is unclear. Here, we used higher-order principle components of a network of 23 tree-ring chronologies to provide a high-resolution spring (March–April) temperature reconstruction over Turkey during the period 1800–2002. The reconstruction model accounted for 67 % (Adj. R2 =  0.64, p < 0.0001) of the instrumental temperature variance over the full calibration period (1930–2002). The reconstruction is punctuated by a temperature increase during the 20th century; yet extreme cold and warm events during the 19th century seem to eclipse conditions during the 20th century. We found significant correlations between our March–April spring temperature reconstruction and existing gridded spring temperature reconstructions for Europe over Turkey and southeastern Europe. Moreover, the precipitation signal obtained from the tree-ring network (first principle component) showed highly significant correlations with gridded summer drought index reconstruction over Turkey and Mediterranean countries. Our results showed that, beside the dominant precipitation signal, a temperature signal can be extracted from tree-ring series and they can be useful proxies in reconstructing past temperature variability.

Citation: Köse, N., Güner, H. T., Harley, G. L., and Guiot, J.: Spring temperature variability over Turkey since 1800 CE reconstructed from a broad network of tree-ring data, Clim. Past, 13, 1-15,, 2017.
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