Timing of the first drainage of the Baltic Ice Lake synchronous with the onset of Greenland Stadial 1

Muschitiello, Francesco; Lea, James M.; Greenwood, Sarah L.; Nick, F. M.; Brunnberg, Lars; MacLeod, Alison; Wohlfarth, Barbara

doi:10.1111/bor.12155

Cited by 28 publications

(25 citation statements)

References 51 publications

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“…11,650 yBP) during which the Northern Hemisphere experienced an abrupt temperature increase. The YD cooling event was a sudden return to near-glacial conditions during last deglaciation, likely to be triggered by atmosphere–ocean feedback associated with meltwater fluxes and rapid sea ice expansion combined with a weakened Atlantic Meridional Overturning Circulation141516. Ice cores from Greenland have documented the re-establishment of the post-glacial warming in the δ 18 O record17 as a sudden temperature increase.…”

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confidence: 99%

Massive remobilization of permafrost carbon during post-glacial warming

et al. 2016

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Recent hypotheses, based on atmospheric records and models, suggest that permafrost carbon (PF-C) accumulated during the last glaciation may have been an important source for the atmospheric CO2 rise during post-glacial warming. However, direct physical indications for such PF-C release have so far been absent. Here we use the Laptev Sea (Arctic Ocean) as an archive to investigate PF-C destabilization during the last glacial–interglacial period. Our results show evidence for massive supply of PF-C from Siberian soils as a result of severe active layer deepening in response to the warming. Thawing of PF-C must also have brought about an enhanced organic matter respiration and, thus, these findings suggest that PF-C may indeed have been an important source of CO2 across the extensive permafrost domain. The results challenge current paradigms on the post-glacial CO2 rise and, at the same time, serve as a harbinger for possible consequences of the present-day warming of PF-C soils.

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confidence: 99%

Massive remobilization of permafrost carbon during post-glacial warming

et al. 2016

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“…This is supported by both geological and modelling evidence, which suggests that a freshwater pulse into the Arctic Ocean could have weakened AMOC by > 30 %, considerably more that the < 15 % resulting from a similar pulse injected into the North Atlantic (Condron and Winsor, 2012). Still other evidence implicates meltwater from the Fennoscandian Ice Sheet (FIS) as the YD trigger (Muschitiello et al, , 2016, highlighting meltwater provenance as a key uncertainty intrinsic to the meltwater hypothesis. Intriguingly, find that the FIS-derived meltwater pulse ended at 12.880 ka BP, coinciding with the LSE.…”

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confidence: 74%

Evaluating the link between the sulfur-rich Laacher See volcanic eruption and the Younger Dryas climate anomaly

2018

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Abstract. The Younger Dryas is considered the archetypal millennial-scale climate change event, and identifying its cause is fundamental for thoroughly understanding climate systematics during deglaciations. However, the mechanisms responsible for its initiation remain elusive, and both of the most researched triggers (a meltwater pulse or a bolide impact) are controversial. Here, we consider the problem from a different perspective and explore a hypothesis that Younger Dryas climate shifts were catalysed by the unusually sulfurrich 12.880 ± 0.040 ka BP eruption of the Laacher See volcano (Germany). We use the most recent chronology for the GISP2 ice core ion dataset from the Greenland ice sheet to identify a large volcanic sulfur spike coincident with both the Laacher See eruption and the onset of Younger Dryasrelated cooling in Greenland (i.e. the most recent abrupt Greenland millennial-scale cooling event, the Greenland Stadial 1, GS-1). Previously published lake sediment and stalagmite records confirm that the eruption's timing was indistinguishable from the onset of cooling across the North Atlantic but that it preceded westerly wind repositioning over central Europe by ∼ 200 years. We suggest that the initial short-lived volcanic sulfate aerosol cooling was amplified by ocean circulation shifts and/or sea ice expansion, gradually cooling the North Atlantic region and incrementally shifting the midlatitude westerlies to the south. The aerosol-related cooling probably only lasted 1-3 years, and the majority of Younger Dryas-related cooling may have been due to the seaice-ocean circulation positive feedback, which was particularly effective during the intermediate ice volume conditions characteristic of ∼ 13 ka BP. We conclude that the large and sulfur-rich Laacher See eruption should be considered a viable trigger for the Younger Dryas. However, future studies should prioritise climate modelling of high-latitude volcanism during deglacial boundary conditions in order to test the hypothesis proposed here.

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“…a BP; Muschitiello et al . ). An ice‐margin re‐advance south of Motala during the Younger Dryas cold event (Greenwood et al .…”

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confidence: 97%

“…This situation resulted in an extended BIL stretching westward towards Mt Billingen and a subsequent first drainage of the BIL (Bj€ orck 1979;Bj€ orck & Digerfeldt 1984;Bennike & Jensen 2013;Sw€ ard et al 2016) at the end of the Aller€ od period (12 867AE66 cal. a BP; Muschitiello et al 2016). An ice-margin re-advance south of Motala during the Younger Dryas cold event (Greenwood et al 2015) probably cut off the connection between the BIL and the V€ attern/Tidan basin, reestablishing glacial Lake V€ attern-Tidan (VI) for a short time ( Fig.…”

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confidence: 99%

A chronology of environmental changes in the Lake Vättern basin from deglaciation to its final isolation

Swärd

O’Regan

Björck

et al. 2017

Boreas

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During and after deglaciation, Lake Vättern developed from a proglacial lake situated at the westernmost rim of the Baltic Ice Lake (BIL), into a brackish water body connecting the North Sea and the Baltic Sea, and finally into an isolated freshwater lake. Here we present geochemical and mineralogical data from a 70‐m composite sediment core recovered in southern Lake Vättern. Together with a radiocarbon age model of this core, we are able to delineate the character and timing of the different lake stages. In addition to a common mineralogical background signature seen throughout the sediment core, the proglacial sediments bear a calcite imprint representing ice‐sheet transported material from the limestone bedrock that borders the lake basin in the northeast. The proglacial fresh to brackish water transition is dated to 11 480±290 cal. a BP and is in close agreement with other regional chronologies. The brackish period lasted c. 300 years and was followed by a c. 1600 year freshwater period before the Vättern basin became isolated from the Initial Littorina Sea. Decreasing detrital input, increasing δ13C values and the appearance of diatoms in the upper 15 m of the sediment succession are interpreted as an overall increase in biological productivity. This mode of sedimentation continues until the present and is interpreted to mark the final isolation of the lake at 9530±50 cal. a BP. Consequently, the isolation of Lake Vättern was not an outcome of the Ancylus Lake regression, but rather because of ongoing continental uplift in the early Littorina period.

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Timing of the first drainage of the Baltic Ice Lake synchronous with the onset of Greenland Stadial 1

Cited by 28 publications

References 51 publications

Massive remobilization of permafrost carbon during post-glacial warming

Massive remobilization of permafrost carbon during post-glacial warming

Evaluating the link between the sulfur-rich Laacher See volcanic eruption and the Younger Dryas climate anomaly

A chronology of environmental changes in the Lake Vättern basin from deglaciation to its final isolation

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