The evidence from trees
Tree rings are sensitive indicators of annual climate. Thick rings indicate rapid growth during warm, wet years. Thin rings, and therefore slow growth, indicate cold, dry years. By matching the overlapping sequences from progressively older trees, a complete tree-ring chronology can be extended back thousands of years. A single tree, however, records only local climate. To establish the regional climate, many trees from various localities must be examined.
Trees from the Arctic, a region more sensitive than other areas to climate fluctuations, are particularly good recorders of climate variations.
Topic: Earth Science
Subtopic: Climate/Climate Change
Keywords: Arctic regions, Climatology, Tree rings, Trees