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1500 yr climatic periodicities and their implications
1 Canadian Forest Service, 5320 122nd Street, Edmonton, Alberta T6H 3S5, Canada
2 Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2H4, Canada
Fourier and nonlinear regression analysis of a 4000+ yr paleoclimate proxy record in western Canada shows strong periodicities of 
1500 yr and several weaker century- to millenial-scale periodicities. In conjunction with the 23 708 yr Milankovitch periodicity, these produce a model of climate fluctuation through the postglacial consistent with recognized paleoclimatic fluctuations of the past 15 000 yr in the northern mid-latitudes. These results suggest that postglacial climatic anomalies such as the Little Ice Age and the Younger Dryas were at least in part periodic phenomena rather than the result of unique, aperiodic events. Projecting these periodicities into the future suggests that even in the absence of anthropogenic climate forcing, a natural warming trend will continue until ca. A.D. 2400.
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