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

• Published in: The Holocene
• Main Authors: Hughes, M. K., Vaganov, E. A., Shiyatov, S., Touchan, R., Funkhouser, G.
• Format: Article in Journal/Newspaper
• Language: English
• Published: SAGE Publications 1999
• Subjects: Yakutia
• Online Access: http://dx.doi.org/10.1191/095968399671321516; http://journals.sagepub.com/doi/pdf/10.1191/095968399671321516

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.