Tree ring growth dating
Each year trees add growth rings, which can indicate what sort of growing season the tree experienced.Interestingly these rings are more than a temperature indicator, they also tell the researcher about moisture and cloudiness as well.Mc Murry and her colleague solved a longstanding mystery by studying tree rings. Some people in New England thought judgment day was at hand.Accounts of that day, which became known as "New England's Dark Day," include mentions of midday meals by candlelight, night birds coming out to sing, flowers folding their petals, and strange behavior from animals.The scientists announced on June 6, 2008 that evidence from tree rings reveals massive wildfires as the likely cause, one of several theories proposed after the event, but dismissed as "simple and absurd." "A fire comes along and heat goes through the bark, killing the living tissue.A couple of years later, the bark falls off revealing the wood and an injury to the tree.But for the specimen to be useful in extending the tree-ring chronology, the absolute calendar age of its rings must be determined.
Perhaps the best evidence that some BCPs can grow multiple rings per year is the fact that it has already been demonstrated.New wood formed in a tree during spring and summer is light in color. Near the core of a tree, rings will be tighter and darker if a young tree grows up in the shade a mature forest.Toward the end of a growing season, new cells formed are smaller and have darker thicker walls. Soil conditions that might change over time can also affect the growth.In addition to solid direct evidence that these BCPs may be capable of growing multiple rings per year, there is abundant indirect evidence of multiplicity.To build a master-chronology of BCPs believed to extend back over 8,700 years, researchers must use wood from dead trees to extend the chronology beyond the lifetime of currently living trees.
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They also document temperature and cloud cover as they impact tree growth as well.