Tree ring dating and climate change
It features 24 hours of battery life and claims to be a 'mini-disco on the move'. Drought is a focal point in the assessment of hydroclimatic variability in the Mediterranean Basin.Drought-sensitive tree-ring records are a valuable resource for extending knowledge of hydroclimatic variability both in space and time.Here we will discuss the first large scale systematic tree-ring sampling in NA and EM.One-hundred-fifty chronologies have been developed or are being developed.We conducted a site-by-site correlation analysis of each residual ring-width chronology from the EM against local gridded climate data to identify the appropriate hydroclimatic season for developing point-to- point precipitation and drought field reconstruction.But the samples also showed a small, unusual anomaly following the year 2200 B. Paleoclimate research has suggested a major short-term arid event about this time.“This radiocarbon anomaly would be explained by a change in growing season, i.e., climate, dating to exactly this arid period of time,” says Manning.“We’re showing that radiocarbon and these archaeological objects can confirm and in some ways better date a key climate episode.”That climate episode, says Manning, had major political implications.
The ITRDB includes raw ring width, wood density, and isotope measurements, plus site growth index chronologies. Reconstructed climate parameters are also available for some areas.
A handful of tree ring samples stored in an old cigar box have shed unexpected light on the ancient world, thanks to research by archaeologist Sturt Manning and collaborators at Cornell, Arizona, Chicago, Oxford and Vienna, forthcoming in the June issue of the Journal of Archaeological Science.
The samples were taken from an Egyptian coffin; Manning also examined wood from funeral boats buried near the pyramid of Sesostris III.
Investigators who wish to contribute their data to the ITRDB can find information on contributing below.
Data and study description information can be contributed by emailing decadal format data files to [email protected]
He used a technique called “dendro radiocarbon wiggle matching,” which calibrates radiocarbon isotopes found in the sample tree rings with patterns known from other places in the world that have already identified chronologies, such as the long European oak chronology or the bristle cone pine trees of North America.