Reduced sensitivity of recent tree-growth to temperature at high northern latitudes

  title={Reduced sensitivity of recent tree-growth to temperature at high northern latitudes},
  author={Keith R. Briffa and Fritz Hans Schweingruber and P. D. Jones and Timothy J. Osborn and Stepan G. Shiyatov and Eugene A. Vaganov},
Tree-ring chronologies that represent annual changes in the density of wood formed during the late summer can provide a proxy for local summertime air temperature. Here we undertake an examination of large-regional-scale wood-density/air-temperature relationships using measurements from hundreds of sites at high latitudes in the Northern Hemisphere. When averaged over large areas of northern America and Eurasia, tree-ring density series display a strong coherence with summer temperature… 

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The causes of a reduced sensitivity of high-latitude tree growth to variations in summer temperature for recent decades,, compared to earlier this century, are unknown. This sensitivity change is

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Reconstruction of tree distributions during the HTM suggests that the future position of the treeline due to global warming may approximate its former Holocene maximum position, and an increased dominance of evergreen tree species in the northern Siberian forests may be an important difference between past and future conditions.

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