Dendrochronology
Channel: 宇宙のすべての知識 プリンシピア
Date: 05/03/2019

Dendrochronology, by Wikipedia https://en.wikipedia.org/wiki?curid=37800 / CC BY SA 3.0

#American_inventions
#Art_history
#Conservation_and_restoration
#Dating_methods
#Dendrology
#Incremental_dating
Dendrochronology

Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed. As well as dating them this can give data for dendroclimatology, the study of climate and atmospheric conditions during different periods in history from wood.

Dendrochronology is useful for determining the precise age of samples, especially those that are too recent for radiocarbon dating, which always produces a range rather than an exact date, to be very accurate. However, for a precise date of the death of the tree a full sample to the edge is needed, which most trimmed timber will not provide. It also gives data on the timing of events and rates of change in the environment (most prominently climate) and also in wood found in archaeology or works of art and architecture, such as old panel paintings. It is also used as a check in radiocarbon dating to calibrate radiocarbon ages.

New growth in trees occurs in a layer of cells near the bark. A tree's growth rate changes in a predictable pattern throughout the year in response to seasonal climate changes, resulting in visible growth rings. Each ring marks a complete cycle of seasons, or one year, in the tree's life. , the oldest tree-ring measurements in the Northern Hemisphere are a floating sequence extending from about 12,580 to 13,900 years. Dendrochronology derives from ('), meaning "tree", ('), meaning "time", and "("), "the study of".

The Greek botanist Theophrastus (ca. 371 – ca. 287 BC) first mentioned that the wood of trees has rings. In his "Trattato della Pittura" (Treatise on Painting), Leonardo da Vinci (1452 – 1519) was the first person to mention that trees form rings annually and that their thickness is determined by the conditions und...