Jökull


Jökull - 01.12.1956, Page 3

Jökull - 01.12.1956, Page 3
öh o, ^ ii JÖKLARANNSÓKNAFÉLAGS ÍSLANDS 6. ÁR REYKJAVÍK 1956 On the Variations of Svínafellsjökull, Skaftafellsjökull and Kvíárjökull in Öræfi BY SIGURDUR THORARI NSSON INTRODUCTORY: In his paper on the glaciology of Spitsbergen, based on studies made in 1931, Ahlmann stated that the stage from which the present regression of the Spitsbergen glaciers has taken place “i» — at least for many of the glaciers — quite close to their maximum extension since the last glaciation of the Quaternary Ice Age” (Ahl- mann 1933, p. 185). In a paper published in 1935 and mainly based on studies of the outlet glaciers of Dranga- jökull carried out in 1931, Eythórsson writes: “My observations of glacier margins in Iceland and of their terminal moraines have more and more convinced me that the stage from which the glaciers are now receding must have been a very advanced one, compared with the max- imal extension they have reached within the historical time in Iceland (i.e. the last 1000 years) and probably since the close of the Ice age” (Eythórsson 1935, p. 136). Further studies of the lateral and frontal moraines of glaciers in the glaciated districts around the northernmost Atlantic led Ahlmann and myself to the conclusion that the moraines which were formed during the advance of the glaciers in the first half of the 18th and about the middle of the 19th centuries (in some cases as late as ab. 1890) mark their maximum ex- tension in historical and probably even in Post- glacial Time (Thorarinsson 1936, p. 194; 1944, p. 148; 1952, p. 8; Ahlmann 1948, p. 67 ff.). Tephrochronological studies at Hagavatn pro- ved clefinitely that the recent terminal moraines from which the Hagafellsjökull eystri has been rececling during the last few decades, mark the maximum extension of that glacier during the whole Postglacial Time (Thorarinsson 1949, p. 250). But in the same paper I stated that tliere are in front of some of the glacier tongues of Vatnajökull terminal moraines, “which might indicate, that in early Subatlantic Time these 1 LANDSBun'ASAFN 212190 ÍSLANDS

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