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Unformatted text preview: and their growth patterns, which correlates exceptionally well to general climate and climate change. Rings of both living and dead trees can be examined, using fine cores. For example, a forest of conifers in Mongolia has specimens available from the 1500's through today. Ring pattern indicates a general warming climate, with more growth (wider rings) during the past half century. Moisture has similar effects on tree rings. In the state of Washington, specimens in the coastal rain forest have much wider growth rings than those of the Cascades. Looking more specifically, in Washington, growth rings lag one year behind the climate pattern. The precipitation in 2010 winter (largely snow pack) determines the early xylem growth for the spring of 2011. The reserves the tree was able to accumulate in the spring-summer of 2010, based on that winter's snow pack, provide the reserves for the spring early growth in xylem for 2011....
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- Fall '09