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Tree-Ring Dating of Extreme Lake Levels at the Subarctic–Boreal Interface

Published online by Cambridge University Press:  20 January 2017

Yves Bégin
Yves Bégin*
Affiliation:
Centre d'études nordiques, Université Laval, Ste-Foy, Québec, Canada G1K 7P4
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Abstract

The dates of extreme water levels of two large lakes in northern Quebec have been recorded over the last century by ice scars on shoreline trees and sequences of reaction wood in shore trees tilted by wave erosion. Ice-scar chronologies indicate high water levels in spring, whereas tree-tilting by waves is caused by summer high waters. A major increase in both the amplitude and frequency of ice floods occurred in the 1930s. No such change was indicated by the tree-tilting chronologies, but wave erosion occurred in exceptionally rainy years. According to the modern record, spring lake-level rise is due to increased snowfalls since the 1930s. However, the absence of erosional marks in a large number of years since 1930 suggests a high frequency of low-water-level years resulting from dry conditions. Intercalary years with very large numbers of marked trees (e.g., 1935) indicate that the interannual range of summer lake levels has increased since the 1930s. Increased lake-flood frequency is postulated to be related to a slower expansion of arctic anticyclones, favoring the passage of cyclonic air masses over the area and resulting in abundant snowfall in early winter. Conditions in summer are due to the rate of weakening of the anticyclones controlling the position of the arctic front in summer. This position influences the path of the cyclonic air masses, which control summer precipitation and consequently, summer lake levels in the area.

Keywords

tree ringdendrochronologyhydrologysubarcticsnowlake levelsice scarreaction wooderosionshorewaves
Type
Research Article
Information
Quaternary Research , Volume 55 , Issue 2 , March 2001 , pp. 133 - 139
Copyright
University of Washington

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