--science that uses

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--science that uses tree rings to study
present and past climates
http//web.utk.edu/grissino/
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Dendroclimate studies have revealed much about
Photo Henri Grissino-Mayer
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Bristlecone pine (5000 yr old)
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Juniper tree From New Mexico
1320 AD
256 BC
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Sugar maple (Acer saccharum)
Douglas fir (Pseudotsuga menziesii)
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Locations of established tree-ring chronologies
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I. PRINCIPLES OF DENDOCHRONOLOGY
(e.g., in arid regions moisture is the
limiting factor, whereas in high latitude zones
temperature may be the limiting factor )
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For climate research, best to sample trees near
the
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--need to select trees that are sensitive to
environmental conditions
(e.g., tree on right is more sensitive to
drought than tree on left)
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--states that matching patterns in ring widths or
other ring characteristics (such as ring
density) among several tree-ring series allows
the identification of the exact year in which
each tree ring was formed
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--need to take more than one core per tree and
sample more than one tree per site
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Estimated precipitation from tree ring widths for
the western US
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Correlation of tree ring widths and glacier
fluctuation
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• tree ring study showed that the 1900-1930 period
  
• was abnormally wet compared to last 400 years

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Flood scar
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dendropyrochronology
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Fire scars
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