Dan Hammarlund
Professor
Tree-limit ecotonal response to Holocene climate change in the Scandes Mountains of west-central Sweden
Author
Summary, in English
Evaluation of the DOH records exhibits millennial-scale trends, which are significantly correlated between profiles during the periods 6500-4000 cal yr BP and 2100-0 cal yr BP. Within these periods, the time between 5800 and 4800 cal yr BP, and 1800 cal yr BP until the present, are recognised as episodes of increasing climatic humidity. In general, the vegetational, geochemical and sedimentary records were shown to correlate with several Holocene climatic events and transitions, identified elsewhere in north-western Europe. The climatic forcing of some of these sub-Milankovitch scale perturbations is unclear, but a coupling to internal circulation dynamics of the North Atlantic Ocean is hypothesized.
Chronologies of the geological archives studied within the project were based on radiocarbon dating and tephrochronology. At Lake Stentjärn, three Holocene cryptotephra horizons were detected, one of which was geochemically correlated with the Icelandic Askja-1875 eruption. At Klocka Bog, at least seven cryptotephra horizons were recorded in the two peat profiles, and five of the horizons were geochemically correlated with the Askja-1875, Hekla-3, Kebister, Hekla-4, and Lairg A tephras, respectively.
Department/s
- Quaternary Sciences
Publishing year
2005
Language
English
Publication/Series
Lundqua thesis
Issue
53
Full text
- Available as PDF - 13 MB
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Document type
Dissertation
Publisher
Department of Geology, Lund University
Topic
- Geology
Keywords
- tree-limit ecotone
- alpine vegetation
- tephrochronology
- peat humification
- plant macrofossils
- Palaeobotany
- fylogeni
- Paleobotanik
- palynology
- phylogeny
- palynologi
- Geologi
- Geology
- pedology
- geomorphology
- Physical geography
- klimatologi
- geomorfologi
- climatology
- Fysisk geografi
- cartography
- Holocene climate
- palaeoecology
- marklära
- kartografi
- pollen influx
Status
Published
Supervisor
- Dan Hammarlund
ISBN/ISSN/Other
- ISSN: 0281-3033
- ISSN: 0281-3033
- ISBN: 91-86746-64-2
Defence date
3 June 2005
Defence time
13:15
Defence place
GeoBiosphere Science Centre Sölvegatan 12 Pangea
Opponent
- John Lowe (Professor)