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(Article of periodic en Anglais - 1977)

Document title

Glacier and climatic fluctuations inferred from tree-growth variations over the last 250years, central southern Norway

Authors(s) and Affiliation(s)

MATTHEWS J. A. ;

Abstract

A Pinus sylvestris (Scots pine) tree-growth series from near the tree-line in upper Gudbrandsdalen, southern Norway (Slastad 1957) is analysed, and possible relationships to glacier and climatic fluctuations are explored. The series is smoothed by harmonic analysis, and calibrated using a variety of independently derived glaciological, geomorphological, and climatological data from Storbreen (Jotunheimen), the Storbreen gletschervorfeld, and Dombas meteorological station. The curves are then used to make inferences about the number, date, magnitude, and duration of glacier fluctuations and summer temperature fluctuations from 1700A.D. to 1950A.D. At least 10 major oscillations in the tree-growth data, reflecting fluctuations in summer temperatures of amplitude 1.0C to 3.0C, are believed to be indicative of glacier fluctuations. Periods of reduced tree-growth are a response to cool phases and indicate glacier advances after a lag of about 4years. These short-term oscillations are superimposed on a general trend of glacier retreat and a long-term warming of 1.0C indicated by a glacier equilibrium-line displacement of 140m to 145m since 1750A.D. Problems and prospects for development of dendroglaciological and dendroclimatological techniques are discussed. (E. John).

Source

Article of periodic

published at : Boreas. An international journal of Quaternary geology

Editor :

Millesime : 1977, vol. 6, no1 [pp. 1-24]

Language

Anglais

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