Geomorphic Features as Indicators of Climatic Fluctuations in a Periglacial Environment, Northern Sweden
作者:
NybergRolf,
LindhLars,
期刊:
Geografiska Annaler: Series A, Physical Geography
(Taylor Available online 1990)
卷期:
Volume 72,
issue 2
页码: 203-210
ISSN:0435-3676
年代: 1990
DOI:10.1080/04353676.1990.11880316
出版商: Taylor&Francis
数据来源: Taylor
摘要:
ABSTRACTGeomorphic responses to climatic fluctuations in the periglacial mountain environment of northern Sweden, especially the Abisko mountains, are discussed. Although the frequency and magnitude of rapid mass movements are related to climatic conditions, the depositional patterns of the processes and the variable availability of source material complicate their use as climatic indicators. Possibly, debris flows and slushflows were frequent during the Little Ice Age, according to lichenometric dating of old deposits. Field observations suggest a fairly high frequency also during the last few decades. Boulder pavements, moraine-like ridges and glacial striae in front of major snow- fields indicate these were previously larger and in some cases active as small glaciers perhaps in the cold beginning of the 1900's. During the warm 1920–30's snowpatches and glaciers, as well as permafrost mounds were affected by a general degeneration. Climatic inferences made from the mentioned features are still very crude. Tentatively, it is suggested that they are presently beginning to respond to the cooling trend affecting northern Scandinavia since about 1940. The anticipated impact of a greenhouse warming of the atmosphere has thus so far not been noticeable in this high latitude area.
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