Gletscher und Klima im Alpinen Spätglazial und frühen Holozän

Innsbruck

2009

S. 5-26

4 Abb., zahlr. Lit. Ang.

Artikel aus einer ZeitschriftUnselbständiges Werk

200155644

10Be dating of prominent glacier advances (stadials) in the Alps supports the correlation of the Gschnitz stadial (>16 ka) with the Heinrich 1 ice rafting event, the Egesen-maximum advance (~12.3 - 12.4 ka) with the early Younger Dryas and the Kartell advance (~10.8 ka) with a climatic fluctuation during the early Preboreal. The age of the Kromer advance (~8.4 ka) remains somewhat enigmatic. The interpretation of the glacial record with glacier-climate models (summer temperature change (ÄTs), precipitation change (ÄP)) shows that during the Gschnitz stadial summers were ~10 °C colder than at present and annual precipitation was reduced to ~25 - 50% of modern annual sums. During the Egesen maximum, ÄP depends on the estimated ÄTs. For a ÄTs of -3.5 °C, precipitation along the northern fringe of the Eastern Alps was about similar to modern sums, in the sheltered central valleys ÄP was in the order of -20 to -30 %. A scenario with a ÄTs of -5 °C leads to generally drier conditions (~-15 % vs. ~-50 % ÄP) but the spatial pattern of precipitation change remains the same. During the Kartell advance, it was only slightly cooler than during the Little Ice Age, while precipitation was rather similar.