Dendro dating

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New wood grows from the cambium layer between the old wood and the bark.In the spring, when moisture is plentiful, the tree devotes its energy to producing new growth cells.

There is also a difference in the nature of the wood from the exterior bark, the outermost growing layers where the sap flows (the sapwood) down to the heartwood and core of the tree.These first new cells are large, but as the summer progresses their size decreases until, in the fall, growth stops and cells die, with no new growth appearing until the next spring.The contrast between these smaller old cells and next year's larger new cells is enough to establish a ring, thus making counting possible.Checked through a variety of methods independent of tree-ring growth, this principle has proved to be valid.

Review all the principles of dendrochronology as complied by Chronology Building The climatic changes or patterns in specific geographic areas can be traced by the study of old living trees."Durant les deux dernières années, le GIEC a démontré un talent pour se placer lui-même dans des situations embarrassantes, se mettant ainsi en situation de cible facile pour les critiques et les sceptiques du climat.

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