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Sökning: WFRF:(Hantemirov RM)

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1.
  • Briffa, KR, et al. (författare)
  • Trends in recent temperature and radial tree growth spanning 2000 years across northwest Eurasia.
  • 2008
  • Ingår i: Philos Trans R Soc Lond B Biol Sci. - : The Royal Society. - 0962-8436. ; 363, s. 2271-2284
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper describes variability in trends of annual tree growth at several locations in the high latitudes of Eurasia, providing a wide regional comparison over a 2000-year period. The study focuses on the nature of local and widespread tree-growth responses to recent warming seen in instrumental observations, available in northern regions for periods ranging from decades to a century. Instrumental temperature data demonstrate differences in seasonal scale of Eurasian warming and the complexity and spatial diversity of tree-growing-season trends in recent decades. A set of long tree-ring chronologies provides empirical evidence of association between inter-annual tree growth and local, primarily summer, temperature variability at each location. These data show no evidence of a recent breakdown in this association as has been found at other high-latitude Northern Hemisphere locations. Using Kendall's concordance, we quantify the time-dependent relationship between growth trends of the long chronologies as a group. This provides strong evidence that the extent of recent widespread warming across northwest Eurasia, with respect to 100- to 200-year trends, is unprecedented in the last 2000 years. An equivalent analysis of simulated temperatures using the HadCM3 model fails to show a similar increase in concordance expected as a consequence of anthropogenic forcing.
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2.
  • Larsen, LB, et al. (författare)
  • New ice core evidence for a volcanic cause of the A.D. 536 dust veil
  • 2008
  • Ingår i: Geophysical Research Letters. ; 35:L04708
  • Tidskriftsartikel (refereegranskat)abstract
    • New and well-dated evidence of sulphate deposits in Greenland and Antarctic ice cores indicate a substantial and extensive atmospheric acidic dust veil at A.D. 533–534 ± 2 years. This was likely produced by a large explosive, near equatorial volcanic eruption, causing widespread dimming and contributing to the abrupt cooling across much of the Northern Hemisphere known from historical records and tree-ring data to have occurred in A.D. 536. Tree-ring data suggest that this was the most severe and protracted short-term cold episode across the Northern Hemisphere in the last two millennia, even surpassing the severity of the cold period following the Tambora eruption in 1815.
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