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Variations in Climate Since 1602 as Reconstructed from Tree Rings

Published online by Cambridge University Press:  20 January 2017

Harold C. Fritts ,
G. Robert Lofgren  and
Geoffrey A. Gordon
Harold C. Fritts
Affiliation:
Laboratory of Tree-Ring Research, University of Arizona, Tucson, Arizona 85721
G. Robert Lofgren
Affiliation:
Laboratory of Tree-Ring Research, University of Arizona, Tucson, Arizona 85721
Geoffrey A. Gordon
Affiliation:
Laboratory of Tree-Ring Research, University of Arizona, Tucson, Arizona 85721
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Abstract

Spatial anomalies of tree-ring chronologies can provide information on high-frequency spatial anomalies in paleoclimate representing droughts, colder-than-normal intervals, and other synoptic-scale features. Examples are presented in which 65 tree-ring chronologies are calibrated with spatial anomalies in North American meteorological records of seasonal temperature and precipitation, and with sea-level pressure over the North American and North Pacific sectors. Multivariate transfer functions are obtained that scale and convert the past spatial variations in the tree-ring record into estimates of past variations in the meteorological record. Objective verifications of the reconstructions are obtained using independent meteorological observations for time periods other than those used in the calibration. Historical information or other proxy data from the 19th century are also used for verifying the decadal (or longer) and regional reconstructions and for identifying strengths and weaknesses of the various sources of information. The reconstructed winter and summer temperatures for the United States and southwestern Canada and winter precipitation for the Columbia Basin and California during the 17th through 19th centuries were found to differ from the 20th century means with large-scale variations evident. Extreme winters similar to 1976–77 are also identified and found to be more frequent in the past, especially in the 17th century. The climatic reconstructions in this time domain are dominated by high-frequency, synoptic-scale fluctuations that can be interpreted as cyclonic-scale changes in atmospheric circulation. Such reconstructions may be useful for testing various climatic models and estimates developed primarily from 20th-century meteorological data against the longer estimated record for the 17th through 19th centuries.

Type
Research Article
Information
Quaternary Research , Volume 12 , Issue 1 , July 1979 , pp. 18 - 46
Copyright
University of Washington

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