Tree-ring dating of extreme lake levels at the Subarctic-Boreal interface

Auteur :
BÉGIN, Y.

Description :
The dates of extreme water levels of 2 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. 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. The position of the arctic front in summer influences the path of the cyclonic air masses, which control summer precipitation and, consequently, summer lake levels in the area.


Type de document :
Article de périodique

Source :
Quaternary research, issn : 0033-5894, 2001, vol. 55, n°. 2, p. 133-139, Collation : Illustration, Références bibliographiques : 28 ref.

Date :
2001

Editeur :
Pays édition : Etats-Unis, San Diego, CA, Elsevier