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Sand drift events and surface winds in south-central Sweden : From the deglaciation to the present

Bernhardson, Martin LU ; Alexanderson, Helena LU ; Björck, Svante LU and Adolphi, Florian LU (2019) In Quaternary Science Reviews 209. p.13-22
Abstract

During the transition from the last glacial into the Holocene interglacial, the atmospheric circulation in the North Atlantic area changed from a glacial mode, influenced by the presence of large ice sheets, into a system more similar to that of the present day. This change had implications for wind, temperature and precipitation patterns that can be traced in geological archives. Here, we focus on reconstructing past wind directions over southern Scandinavia, as inferred from the net sediment transport direction of inland dunes in south-central Sweden. We analysed single dunes and dune fields along a 540-km-long S-N transect with LiDAR (Light detection and ranging) derived DEMs (digital elevation models) to determine their... (More)

During the transition from the last glacial into the Holocene interglacial, the atmospheric circulation in the North Atlantic area changed from a glacial mode, influenced by the presence of large ice sheets, into a system more similar to that of the present day. This change had implications for wind, temperature and precipitation patterns that can be traced in geological archives. Here, we focus on reconstructing past wind directions over southern Scandinavia, as inferred from the net sediment transport direction of inland dunes in south-central Sweden. We analysed single dunes and dune fields along a 540-km-long S-N transect with LiDAR (Light detection and ranging) derived DEMs (digital elevation models) to determine their geomorphological type and the directional mode of the wind that led to their formation. Luminescence ages of sand drift and dune formation were compiled from previous studies, allowing us to build a chronology of sand drift after the deglaciation of south-central Sweden. The majority of the dunes appear to have been formed by westerly or northwesterly winds and stabilised ∼10.5–9.0 ka. Although this is rather close in time to the local deglaciation for the northern sites, it is long after the disappearance of ice from the more southern sites. The coeval dune stabilisation over such a large geographical area suggests that regional environmental conditions played an important role. It is likely that an unstable climate in conjunction with low groundwater tables during the early Holocene locally delayed vegetation from stabilising the dunes.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aeolian, Geomorphology, GIS, Holocene, Luminescence dating, Palaeoclimatology, Remote sensing, Sand drift, Sand dunes, Scandinavia, Sweden
in
Quaternary Science Reviews
volume
209
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85061734229
ISSN
0277-3791
DOI
10.1016/j.quascirev.2019.01.017
project
Aeolian activity in Sweden: an unexplored environmental archive
language
English
LU publication?
yes
id
21d28d89-df08-43e8-bb63-87818189dfbe
date added to LUP
2019-02-25 11:32:53
date last changed
2020-02-12 09:54:53
@article{21d28d89-df08-43e8-bb63-87818189dfbe,
  abstract     = {<p>During the transition from the last glacial into the Holocene interglacial, the atmospheric circulation in the North Atlantic area changed from a glacial mode, influenced by the presence of large ice sheets, into a system more similar to that of the present day. This change had implications for wind, temperature and precipitation patterns that can be traced in geological archives. Here, we focus on reconstructing past wind directions over southern Scandinavia, as inferred from the net sediment transport direction of inland dunes in south-central Sweden. We analysed single dunes and dune fields along a 540-km-long S-N transect with LiDAR (Light detection and ranging) derived DEMs (digital elevation models) to determine their geomorphological type and the directional mode of the wind that led to their formation. Luminescence ages of sand drift and dune formation were compiled from previous studies, allowing us to build a chronology of sand drift after the deglaciation of south-central Sweden. The majority of the dunes appear to have been formed by westerly or northwesterly winds and stabilised ∼10.5–9.0 ka. Although this is rather close in time to the local deglaciation for the northern sites, it is long after the disappearance of ice from the more southern sites. The coeval dune stabilisation over such a large geographical area suggests that regional environmental conditions played an important role. It is likely that an unstable climate in conjunction with low groundwater tables during the early Holocene locally delayed vegetation from stabilising the dunes.</p>},
  author       = {Bernhardson, Martin and Alexanderson, Helena and Björck, Svante and Adolphi, Florian},
  issn         = {0277-3791},
  language     = {eng},
  pages        = {13--22},
  publisher    = {Elsevier},
  series       = {Quaternary Science Reviews},
  title        = {Sand drift events and surface winds in south-central Sweden : From the deglaciation to the present},
  url          = {http://dx.doi.org/10.1016/j.quascirev.2019.01.017},
  doi          = {10.1016/j.quascirev.2019.01.017},
  volume       = {209},
  year         = {2019},
}