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It was in 1929 along with Douglass and several other archaeologists that a tree ring sample was uncovered in Show Low, Arizona.
Pollen and tree ring analysis indicates the Chang Tang plateau was a much more livable environment until becoming drier and colder starting around 1500 BC.
A PDO signal has been reconstructed to 1661 through tree-ring chronologies in the Baja California area.
Tree ring specialist Keith Briffa's February 1998 study showed that this problem was more widespread at high northern latitudes, and warned that it had to be taken into account to avoid overestimating past temperatures.