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Twentieth-century summer warmth in northern Yakutia in a 600-year context

Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ 85721, USA

E. A. Vaganov

Institute of Forest, Siberian Branch, Russian Academy of Science, Akademgorodok, Krasnoyarsk 660036 Russia

S. Shiyatov

Institute of Plant and Animal Ecology, Urals Branch, Russian Academy of Science, Ekatarinburg, 620219 Russia

R. Touchan

G. Funkhouser

Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ 85721, USA

We report unusual twentieth-century early-summer warmth recorded by larch tree-rings at the north ern tree-line in far northeastern Eurasia (Yakutia). The tree-ring series are strongly replicated and well suited to the detection of fluctuations on interannual to century timescales. They are strongly correlated with local instrumental temperature data. Mean early-summer temperature in the twentieth century significantly exceeds that of any period of the same length since ad 1400. A century-scale trend, which commences in the midnineteenth century, is superimposed on interannual and decadal fluctuations, for example a marked cooling since 1978. While many of the 20 coolest early summers in the reconstruction occur within a few years after major explosive volcanic eruptions from low-latitude volcanoes, several of the 20 warmest early summers followed major explosive eruptions from high-latitude volcanoes.

Key Words: Summer temperature • volcanic activity • dendrochronology • larch • Larix cajanderi • ring width • Yakutia

The Holocene, Vol. 9, No. 5, 629-634 (1999)
DOI: 10.1191/095968399671321516


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