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Impact of Holocene slope activity on lacustrine archives in alpine environments: catchment geomorphology and sediment stratigraphies in two non-glacial lakes, -Lapland, Sweden.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
In: Journal of Paleolimnology, ISSN 0921-2728Article in journal (Refereed) Submitted
Identifiers
URN: urn:nbn:se:su:diva-25853OAI: oai:DiVA.org:su-25853DiVA: diva2:200688
Note
Part of urn:nbn:se:su:diva-945Available from: 2006-04-20 Created: 2006-04-20Bibliographically approved
In thesis
1. Alpine lake sediment archives and catchment geomorphology: causal relationships and implications for paleoenvironmental reconstructions
Open this publication in new window or tab >>Alpine lake sediment archives and catchment geomorphology: causal relationships and implications for paleoenvironmental reconstructions
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lake sediments are frequently used as archives of climate and environmental change. Minerogenic sediment variability in alpine lakes is often used to reconstruct past glacier and slope process activity. Alpine lake sediments can however have many different origins, which may induce errors in paleoenvironmental reconstructions. The aim of this project was to enhance the understanding of minerogenic lake sedimentation in alpine lakes and improve their use as environmental archives.

Catchment geomorphology and Holocene sediment sequences were analysed for five alpine lakes. Several minerogenic sediment sources were detected in catchments and sediment sequences. Slope-, fluvial-, periglacial-, nival- and aeolian sediment transportation processes contribute to create complex lake sediment patterns. Large variations in sedimentation rates were discovered within and between lakes, which has implications for sampling strategies and age-model constructions. Similar fine-grained minerogenic laminations were found in four of the investigated lakes, despite large differences in setting. The demonstrated similarity between glacial and non-glacial lakes may complicate interpretations of glaciolacustrine sediment signals.

The main conclusion is that lake sedimentation in alpine environments is highly dependent on several geomorphological factors. All lakes should therefore be viewed as unique and the geomorphology should be thoroughly investigated before environmental reconstructions are based on lake sediment proxies. This study has confirmed the multi-source origin of alpine lake sediment, which also opens possibilities of more multi-faceted paleoenvironmental studies. Different process-proxies could potentially be used to separate different climate signals, e.g. precipitation, temperature and wind, in lake sediments. Analysis of grain-size distribution, detailed mineralogy and magnetic mineralogy in combination with X-ray radiography are suggested methods for such reconstructions.

Place, publisher, year, edition, pages
Stockholm: Institutionen för naturgeografi och kvartärgeologi, 2006. 100 p.
Series
Avhandling i geografi med naturgeografisk inriktning, ISSN 1650-4992 ; 33
Keyword
alpine lakes, geomorphology; lacustrine sedimentation; slope processes; glaciofluvial; Holocene; Swedish Lapland
National Category
Physical Geography
Identifiers
urn:nbn:se:su:diva-945 (URN)91-7155-238-3 (ISBN)
Public defence
2006-05-12, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 13:15
Opponent
Supervisors
Available from: 2006-04-20 Created: 2006-04-20Bibliographically approved

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