From	Matthew Salzer	Date	Tue, 27 Apr 1999 11:05:47 -0500
To	itrdbfor@listserv.arizona.edu
Subject	AZ510: No Correlation
Steve: I've had some experience with bristlecone pine on the San Francisco Peaks and you are correct in noting their lack of correlation with precipitation records and with other precipitation sensitive tree-ring chronologies like Slate Mtn. Ponderosa. There is no "problem" with the AZ510 chronology; it is, as suggested by Dave, Connie, and Jim, a chronology constructed from trees whose growth is not primarily limited by precipitation. Site location and tree species are critical when comparing chronologies and evaluating climate - tree growth relationships. We've collected in the Peaks recently as part of an ongoing archaeological and paleoclimate project and have built a chronology extending back to 663 BC, more than 1200 years longer than the AZ510 chronology collected by Don Graybill in the early 1980's. We're working on a temperature reconstruction from this chronology that should prove to be a valuable addition to the already extensive archive of southwestern USA paleoenvironmental research. Matt Salzer Laboratory of Tree-Ring Research University of Arizona msalzer@ltrr.arizona.edu Upper Midwest Aerospace Consortium msalzer@aero.und.edu