Neue Ergebnisse zur Gletscher- und Klimageschichte des Spätmittelalters und der Neuzeit

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Abstract
This article contributes to the glacier and climatic fluctuations during the late Middle Ages and the Modern Times. With the aid of radiocarbon dating of fossil woods and a fossil soil (fAh) located in the gletschervorfeld of two glaciers (Glacier de Zinal and Riedgletscher, Valais), the foUowing glacier advances could be shown: between 890 yBP and 1095 yBP, at 515 yBP, in the seventeenth and in the nineteenth Century. The tree rings from a larch (Larix decidua Mill.) near the glacier and the tree line (Riedgletscher, 2180 m altitude) was analysed by the X-ray densitometry. The maximum density of the annual rings reflects the summer temperatures since the middle of the twelfth Century. The fluctuations of the maximum density shows a close interrelation with the fluctuations of the Grosser Aletschgletscher (Valais). The local climatic influence of the Riedgletscher during maximal extension is visible in reduced tree-growth. During the retreat phase, when the glacier melted back, the regional climate dominates the tree-growth again.

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