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1 March 2009 Quasi-Periodic Decadal Cycles in Levels of Lakes Michigan and Huron
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Abstract

While Great Lakes' seasonal water-level variations have been previously researched and well documented, few studies thus far addressed longer-term, decadal cycles contained in the 143-yr lake-level instrumental record. Paleo-reconstructions based on Lake Michigan's coastal features, however, hinted to an approximate 30-yr quasi-periodic lake-level variability. In the present study, spectral analysis of 1865–2007 Lakes Michigan/Huron historic levels revealed 8 and 12-yr period oscillations; these time scales match those of large-scale climatic signals previously found in the North Atlantic. While the existing paleodata are inadequate to the task of asserting significance of the 30-yr signal, it is suggested here that this cycle is due to intermodulation of the two near-decadal signals. Furthermore, water budget analysis argues that the North Atlantic decadal climate modes translate to the lake levels primarily through precipitation and its associated runoff.

© 2008 Elsevier Inc.
Janel L. Hanrahan, Sergey V. Kravtsov, and Paul J. Roebber "Quasi-Periodic Decadal Cycles in Levels of Lakes Michigan and Huron," Journal of Great Lakes Research 35(1), 30-35, (1 March 2009). https://doi.org/10.1016/j.jglr.2008.11.004
Received: 3 June 2008; Accepted: 1 September 2008; Published: 1 March 2009
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