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Late Quaternary ice sheet, lake and sea history of southwest Scandinavia - a synthesis

Larsen, Nicolaj Krog LU ; Knudsen, Karen Luise; Krohn, Charlotte Fog; Kronborg, Christian; Murray, Andrew S. and Nielsen, Ole Bjorslev (2009) In Boreas 38(4). p.732-761
Abstract
Based on a large number of new boreholes in northern Denmark, and on the existing data, a revised event-stratigraphy is presented for southwestern Scandinavia. Five significant Late Saalian to Late Weichselian glacial events, each separated by periods of interglacial or interstadial marine or glaciolacustrine conditions, are identified in northern Denmark. The first glacial event is attributed to the Late Saalian c. 160-140 kyr BP, when the Warthe Ice Sheet advanced from easterly and southeasterly directions through the Baltic depression into Germany and Denmark. This Baltic ice extended as far as northern Denmark, where it probably merged with the Norwegian Channel Ice Stream (NCIS) and contributed to a large discharge of icebergs into... (More)
Based on a large number of new boreholes in northern Denmark, and on the existing data, a revised event-stratigraphy is presented for southwestern Scandinavia. Five significant Late Saalian to Late Weichselian glacial events, each separated by periods of interglacial or interstadial marine or glaciolacustrine conditions, are identified in northern Denmark. The first glacial event is attributed to the Late Saalian c. 160-140 kyr BP, when the Warthe Ice Sheet advanced from easterly and southeasterly directions through the Baltic depression into Germany and Denmark. This Baltic ice extended as far as northern Denmark, where it probably merged with the Norwegian Channel Ice Stream (NCIS) and contributed to a large discharge of icebergs into the Norwegian Sea. Following the break up, marine conditions were established that persisted from the Late Saalian until the end of the Early Weichselian. The next glaciation occurred c. 65-60 kyr BP, when the Sunds circle divide re ice advanced from the north into Denmark and the North Sea, where the Scandinavian and British Ice Sheets merged. During the subsequent deglaciation, large ice-dammed lakes formed before the ice disintegrated in the Norwegian Channel, and marine conditions were re-established. The following Ristinge advance from the Baltic, initiated c. 55 kyr BP, also reached northern Denmark, where it probably merged with the NCIS. The deglaciation, c. 50 kyr BP, was followed by a long period of marine arctic conditions. Around 30 kyr BP, the Scandinavian Ice Sheet expanded from the north into the Norwegian Channel, where it dammed the Kattegat ice lake. Shortly after, c. 29 kyr BP, the Kattegat advance began, and once again the Scandinavian and British Ice Sheets merged in the North Sea. The subsequent retreat to the Norwegian Channel led to the formation of Ribjerg ice lake, which persisted from 27 to 23 kyr BP. The expansion of the last ice sheet started c. 23 kyr BP, when the main advance occurred from north-northeasterly directions into Denmark. An ice-dammed lake was formed during deglaciation, while the NCIS was still active. During a re-advance and subsequent retreat c. 19 kyr BP, a number of tunnel-valley systems were formed in association with ice-marginal positions. The NCIS finally began to break up in the Norwegian Sea 18.8 kyr BP, and the Younger Yoldia Sea inundated northern Denmark around 18 kyr BP. The extensive amount of new and existing data applied to this synthesis has provided a better understanding of the timing and dynamics of the Scandinavian Ice Sheet (SIS) during the last c. 160 kyr. Furthermore, our model contributes to the understanding of the timing of the occasional release of large quantities of meltwater from the southwestern part of the SIS that are likely to enter the North Atlantic and possibly affect the thermohaline circulation. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Boreas
volume
38
issue
4
pages
732 - 761
publisher
Taylor & Francis
external identifiers
  • wos:000270642100008
  • scopus:73849094888
ISSN
1502-3885
DOI
10.1111/j.1502-3885.2009.00101.x
language
English
LU publication?
yes
id
b7b00a43-e309-4f7a-8b1d-816171780e67 (old id 1507553)
date added to LUP
2009-11-20 11:44:51
date last changed
2017-12-10 03:50:40
@article{b7b00a43-e309-4f7a-8b1d-816171780e67,
  abstract     = {Based on a large number of new boreholes in northern Denmark, and on the existing data, a revised event-stratigraphy is presented for southwestern Scandinavia. Five significant Late Saalian to Late Weichselian glacial events, each separated by periods of interglacial or interstadial marine or glaciolacustrine conditions, are identified in northern Denmark. The first glacial event is attributed to the Late Saalian c. 160-140 kyr BP, when the Warthe Ice Sheet advanced from easterly and southeasterly directions through the Baltic depression into Germany and Denmark. This Baltic ice extended as far as northern Denmark, where it probably merged with the Norwegian Channel Ice Stream (NCIS) and contributed to a large discharge of icebergs into the Norwegian Sea. Following the break up, marine conditions were established that persisted from the Late Saalian until the end of the Early Weichselian. The next glaciation occurred c. 65-60 kyr BP, when the Sunds circle divide re ice advanced from the north into Denmark and the North Sea, where the Scandinavian and British Ice Sheets merged. During the subsequent deglaciation, large ice-dammed lakes formed before the ice disintegrated in the Norwegian Channel, and marine conditions were re-established. The following Ristinge advance from the Baltic, initiated c. 55 kyr BP, also reached northern Denmark, where it probably merged with the NCIS. The deglaciation, c. 50 kyr BP, was followed by a long period of marine arctic conditions. Around 30 kyr BP, the Scandinavian Ice Sheet expanded from the north into the Norwegian Channel, where it dammed the Kattegat ice lake. Shortly after, c. 29 kyr BP, the Kattegat advance began, and once again the Scandinavian and British Ice Sheets merged in the North Sea. The subsequent retreat to the Norwegian Channel led to the formation of Ribjerg ice lake, which persisted from 27 to 23 kyr BP. The expansion of the last ice sheet started c. 23 kyr BP, when the main advance occurred from north-northeasterly directions into Denmark. An ice-dammed lake was formed during deglaciation, while the NCIS was still active. During a re-advance and subsequent retreat c. 19 kyr BP, a number of tunnel-valley systems were formed in association with ice-marginal positions. The NCIS finally began to break up in the Norwegian Sea 18.8 kyr BP, and the Younger Yoldia Sea inundated northern Denmark around 18 kyr BP. The extensive amount of new and existing data applied to this synthesis has provided a better understanding of the timing and dynamics of the Scandinavian Ice Sheet (SIS) during the last c. 160 kyr. Furthermore, our model contributes to the understanding of the timing of the occasional release of large quantities of meltwater from the southwestern part of the SIS that are likely to enter the North Atlantic and possibly affect the thermohaline circulation.},
  author       = {Larsen, Nicolaj Krog and Knudsen, Karen Luise and Krohn, Charlotte Fog and Kronborg, Christian and Murray, Andrew S. and Nielsen, Ole Bjorslev},
  issn         = {1502-3885},
  language     = {eng},
  number       = {4},
  pages        = {732--761},
  publisher    = {Taylor & Francis},
  series       = {Boreas},
  title        = {Late Quaternary ice sheet, lake and sea history of southwest Scandinavia - a synthesis},
  url          = {http://dx.doi.org/10.1111/j.1502-3885.2009.00101.x},
  volume       = {38},
  year         = {2009},
}