Tree ring growth dating
These separate chronologies did not extend as far back in time because these types of trees are shorter-lived.
However, they did agree with the bristlecone chronology as far back as it could be checked by the shorter chronologies.
Are the long tree-ring chronologies inaccurate due to the inability of dendrochronologists to accurately match tree-ring patterns?
We could discuss the details of pattern-matching technique or the probability of error, but there is another, more quantitative way, to determine if the long tree-ring chronologies are accurate or not.
Early in the history of the science of dendrochronology, a tree-ring chronology using bristlecone pines from the White Mountains of California was developed.
Separate dendrochronologies were then developed, also in America, using other types of trees, such as Douglas fir.
That is the question of what effect increased levels of CO2 in the atmosphere have had on the tree rings. over decades) on trees in cool, moist locations over long periods of time is scarce. current Page=2#comments This one comment tells us so much about the lack of integrity in climate science nowadays.
Chronologies derived from living trees must be extended.
This is accomplished using wood specimens found preserved, for example, in historic buildings, or on the forest floor, or in peat bogs.
The rings in a non-living specimen can be counted to determine the number of years the specimen spans.
But for the specimen to be useful in extending the tree-ring chronology, the absolute calendar age of its rings must be determined.
The annual growth rings vary in thickness each year depending on environmental factors such as rainfall.