Ursula channelPosted on 2019 October
Originally developed for climate science, the method is now an invaluable tool for archaeologists, who can track up to 13, years of history using tree ring chronologies for over 4, sites on six continents. This tree-ring sequence, established by Wesley Ferguson in the s, aided Hans Suess to publish the first useful calibration curve. And, because tree-ring data can be hundreds or thousands of years old, it allows scientists to extend climate records back in time well before modern weather instruments were invented.
The principle of dendrochronology In temperate regions trees form a growth ring per year. Trees that depend heavily on moisture during the growing season will have wider rings during rainy periods and narrower rings during dry periods. Dendrochronology operates on the principle that in temperate climates, like the southwestern United States, trees grow one ring every year. To begin examining the cores, scientists mount them in a way that they are facing upright for a microscope.