A sub-millennial sediment record of ice-stream retreat and meltwater storage in the Baltic Ice Lake during the Bølling-Allerød interstadial

April L. Kelly, Sandra Passchier

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The rapid retreat of the Baltic Ice Stream and the development of the Baltic Ice Lake is assessed using data from sediment cores retrieved from three sub-basins in the southern Baltic Sea. Hydraulic piston coring by the International Ocean Discovery Program (IODP) recovered for the first time intact glacial lake sequences overlying diamictons and other ice-contact deposits at Sites M0063, M0064 and M0065. Based on the particle size and bulk sediment chemical composition the glacial lake sediments were subdivided into a proximal and a distal varve sequence. The origin of a dark, lithologically distinct horizon between the proximal and distal varves is attributed to a lake drainage event following the opening of a spillway in central Sweden. Available age constraints suggest that the Baltic Ice Lake developed during the Bølling-Allerød interstadial and reached its maximum size at ∼13 ka. Ice retreat was forced by surface melt, and amplified by calving in the upstream deepening lake environment. Furthermore, rapid ice retreat and glacio-isostatic processes allowed for the storage of substantial amounts of meltwater in the Baltic Ice Lake during the Allerød warm period. Subsequent lake drainage into the North Atlantic took place through a conduit at higher latitude than previous drainage pathways. The pronounced changes in meltwater storage and routing caused by the rapid retreat of the Baltic Ice Stream may have contributed to abrupt climate change through the effects of changing freshwater supply on Atlantic overturning circulation.

Original languageEnglish
Pages (from-to)126-139
Number of pages14
JournalQuaternary Science Reviews
Volume198
DOIs
StatePublished - 15 Oct 2018

Fingerprint

Baltic Ice Lake
ice stream
interstadial
snowmelt
meltwater
ice retreat
varve
glacial lake
ice
drainage
lakes
sediments
sediment
diamicton
Sweden
climate change
lacustrine environment
spillway
lake
contact

Keywords

  • Baltic
  • Glaciation
  • Pleistocene
  • Scandinavia
  • Sedimentology-marine cores
  • XRF

Cite this

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title = "A sub-millennial sediment record of ice-stream retreat and meltwater storage in the Baltic Ice Lake during the B{\o}lling-Aller{\o}d interstadial",
abstract = "The rapid retreat of the Baltic Ice Stream and the development of the Baltic Ice Lake is assessed using data from sediment cores retrieved from three sub-basins in the southern Baltic Sea. Hydraulic piston coring by the International Ocean Discovery Program (IODP) recovered for the first time intact glacial lake sequences overlying diamictons and other ice-contact deposits at Sites M0063, M0064 and M0065. Based on the particle size and bulk sediment chemical composition the glacial lake sediments were subdivided into a proximal and a distal varve sequence. The origin of a dark, lithologically distinct horizon between the proximal and distal varves is attributed to a lake drainage event following the opening of a spillway in central Sweden. Available age constraints suggest that the Baltic Ice Lake developed during the B{\o}lling-Aller{\o}d interstadial and reached its maximum size at ∼13 ka. Ice retreat was forced by surface melt, and amplified by calving in the upstream deepening lake environment. Furthermore, rapid ice retreat and glacio-isostatic processes allowed for the storage of substantial amounts of meltwater in the Baltic Ice Lake during the Aller{\o}d warm period. Subsequent lake drainage into the North Atlantic took place through a conduit at higher latitude than previous drainage pathways. The pronounced changes in meltwater storage and routing caused by the rapid retreat of the Baltic Ice Stream may have contributed to abrupt climate change through the effects of changing freshwater supply on Atlantic overturning circulation.",
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A sub-millennial sediment record of ice-stream retreat and meltwater storage in the Baltic Ice Lake during the Bølling-Allerød interstadial. / Kelly, April L.; Passchier, Sandra.

In: Quaternary Science Reviews, Vol. 198, 15.10.2018, p. 126-139.

Research output: Contribution to journalArticleResearchpeer-review

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