Heinrich 0 on the east Canadian margin: Source, distribution, and timing

Pearce, Christof; Andrews, John T.; Bouloubassi, Ioanna; Hillaire‐Marcel, Claude; Jennings, Anne E.; Olsen, Jesper; Kuijpers, Antoon; Seidenkrantz, Marit‐Solveig

doi:10.1002/2015pa002884

Cited by 13 publications

(17 citation statements)

References 86 publications

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“…The possibility that BBDC 1 was synchronous with the North Atlantic Heinrich Event 0 can also be rejected. Although Bond et al, (1997) suggested H0 onset at ~12.8 kyr BP, more recent work (Hillaire-Marcel and de Vernal, 2008;Jennings et al, 2015;Pearce et al, 2015), points to a much younger age ~11.5 kyr BP, at the very end of the Younger Dryas (Figures 4 and 7). The onset of BBDC 1 inferred in this study (~14.1 kyr BP) is ~2400 years younger than the revised onset of H0.…”

Section: Pearce Et Al 2015) Previous Radiocarbon Chronologies In Bmentioning

confidence: 89%

“…Within these poorly constrained age brackets, BBDC 0 from our records would then be coeval with the start of Heinrich Event 0. However all higher resolution cores present a revised timing of the Heinrich Event 0 onset following the Younger Dryas interval at ~11.5 kyr (Hillaire-Marcel and de Vernal, 2008;Jennings et al, 2015;Pearce et al, 2015) (Figures 4 and 7). This suggests that the onset of ice-sheet instabilities of the northern Baffin Bay predates the H0 discharge from Hudson Strait recorded mostly in the western Labrador Sea.…”

Section: Asynchronous Ice Sheet Instability During the Last Deglaciationmentioning

confidence: 97%

“…In the Arctic and sub-Arctic regions, this transition is associated with two distinct events of ice sheet instability, known as Heinrich Events 1 and 0 (see a review in Clark et al, 2012). Heinrich Events, massive discharges of icebergs mostly from surges of the Laurentide Ice Sheet (Heinrich, 1988), are well documented in Labrador Sea Pearce et al, 2015;Stoner et al, 1996) and North Atlantic (Bond et al, 1997;Channell et al, 2012;Hemming, 2004) sedimentary records and their timing is well constrained. Heinrich Events are associated with cold stadial conditions in the North Atlantic, but their causal relationship to stadial coolings is unclear (Bond et al, 1993;Broecker, 1994;Marcott et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Asynchronous instability of the North American-Arctic and Greenland ice sheets during the last deglaciation

Jackson¹,

Carlson

Hillaire‐Marcel

et al. 2017

Quaternary Science Reviews

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The chronology of deglacial meltwater pulses from the Laurentide Ice Sheet is well documented. However, the deglacial history of the North American-Arctic (north-eastern Laurentide and Innuitian) and western Greenland ice sheets draining into the Labrador Sea via Baffin Bay is less well constrained. Here we present new high-resolution, radiocarbon-dated records from the central Baffin Bay spanning ~17 to 10 kyr BP and documenting the full deglacial history of Baffin Bay. Sedimentological and geochemical data confirm the presence of two periods of enhanced detrital carbonate delivery, termed Baffin Bay Detrital Carbonate Events (BBDCs). These events are dated to ~14.2-13.7 kyr BP and ~12.7-11 kyr BP. They are synchronous across Baffin Bay and their mineralogical signature indicates a common source of detrital carbonate from northern Baffin Bay. The first event, BBDC 1, postdates Heinrich Event 1 and the second event BBDC 0 predates the recently revised timing of Heinrich Event 0. The onset of the BBDC events appears not to be systematically linked to Greenland temperature change as they occur during both interstadial and stadial periods. This indicates that deglaciation of North American-Arctic and western Greenland ice sheets with the associated iceberg and meltwater discharge were decoupled from the dominant North Atlantic climate mode, where iceberg discharge events from the Laurentide Ice Sheet occurred during stadial periods.

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Section: Pearce Et Al 2015) Previous Radiocarbon Chronologies In Bmentioning

confidence: 89%

Section: Asynchronous Ice Sheet Instability During the Last Deglaciationmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Asynchronous instability of the North American-Arctic and Greenland ice sheets during the last deglaciation

Jackson¹,

Carlson

Hillaire‐Marcel

et al. 2017

Quaternary Science Reviews

View full text Add to dashboard Cite

show abstract

“…It is possible that this is due to data-collection issues (e.g., few organics) and data sparsity (few settlements and fewer GPS monuments) in this formerly fully ice-covered region, leading to a lack of good regional constraints on ice-sheet thickness near the center of the Laurentide Ice Sheet. However, recent data sets have brought more clarity to the Hudson Strait record (e.g., Rashid et al, 2014;Gil et al, 2015;Pearce et al, 2015;Pearce, 2015;Jennings et al, 2015), furthering the argument that this mismatch could be because the models do not accurately represent the dynamics of the marine-terminating Hudson Strait ice catchment (e.g., MacAyeal, 1993). An additional complication of Hudson Bay/Strait is that its drainage area was smaller at the LGM (Fig.…”

Section: Comparison Of Data and Models For River Dischargementioning

confidence: 99%

“…The Hudson Strait Record is difficult to match because of its many episodic meltwater releases (e.g., Heinrich, 1988;Andrews and MacLean, 2003;Hemming, 2004;Gil et al, 2015;Jennings et al, 2015), and only the climate-forced and ice-physics-based G12 reproduces the general form of these events. These events are simplified or smoothed-over by Licciardi et al (1999), but recent improvements in the age constraints on these iceberg and/or meltwater release events (e.g., Rashid et al, 2014;Gil et al, 2015;Pearce et al, 2015;Pearce, 2015;Jennings et al, 2015) set the stage for forthcoming advances in reconstructions of the northeastern core of the Laurentide Ice Sheet.…”

Section: Comparison Of Data and Models For River Dischargementioning

confidence: 99%

Reconstruction of North American drainage basins and river discharge since the Last Glacial Maximum

Wickert

2016

Earth Surf. Dynam.

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Abstract. Over the last glacial cycle, ice sheets and the resultant glacial isostatic adjustment (GIA) rearranged river systems. As these riverine threads that tied the ice sheets to the sea were stretched, severed, and restructured, they also shrank and swelled with the pulse of meltwater inputs and time-varying drainage basin areas, and sometimes delivered enough meltwater to the oceans in the right places to influence global climate. Here I present a general method to compute past river flow paths, drainage basin geometries, and river discharges, by combining models of past ice sheets, glacial isostatic adjustment, and climate. The result is a time series of synthetic paleohydrographs and drainage basin maps from the Last Glacial Maximum to present for nine major drainage basins -the Mississippi, Rio Grande, Colorado, Columbia, Mackenzie, Hudson Bay, Saint Lawrence, Hudson, and Susquehanna/Chesapeake Bay. These are based on five published reconstructions of the North American ice sheets. I compare these maps with drainage reconstructions and discharge histories based on a review of observational evidence, including river deposits and terraces, isotopic records, mineral provenance markers, glacial moraine histories, and evidence of ice stream and tunnel valley flow directions. The sharp boundaries of the reconstructed past drainage basins complement the flexurally smoothed GIA signal that is more often used to validate ice-sheet reconstructions, and provide a complementary framework to reduce nonuniqueness in model reconstructions of the North American ice-sheet complex.

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Exploring the extent to which fluctuations in ice‐rafted debris reflect mass changes in the source ice sheet: a model–observation comparison using the last British–Irish Ice Sheet

Wilton

Bigg

Scourse

et al. 2021

J Quaternary Science

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The British and Irish Ice Sheet (BIIS) was highly dynamic during the Late Quaternary, with considerable regional differences in the timing and extent of its change. This was reflected in equally variable offshore ice‐rafted debris (IRD) records. Here we reconcile these two records using the FRUGAL intermediate complexity iceberg–climate model, with varying BIIS catchment‐level iceberg fluxes, to simulate change in IRD origin and magnitude along the western European margin at 1000‐year time steps during the height of the last BIIS glaciation (31–6 ka bp). This modelled IRD variability is compared with existing IRD records from the deep ocean at five cores along this margin. There is general agreement of the temporal and spatial IRD variability between observations and model through this period. The Porcupine Bank off northwestern Ireland was confirmed by the modelling as a major dividing line between sites possessing exclusively northern or southern source regions for offshore IRD. During Heinrich events 1 and 2, the cores show evidence of a proportion of North American IRD, more particularly to the south of the British Isles. Modelling supports this southern bias for likely Heinrich impact, but also suggests North American IRD will only reach the British margin in unusual circumstances.

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Heinrich 0 on the east Canadian margin: Source, distribution, and timing

Abstract: International audienc

Cited by 13 publications

References 86 publications

Asynchronous instability of the North American-Arctic and Greenland ice sheets during the last deglaciation

Asynchronous instability of the North American-Arctic and Greenland ice sheets during the last deglaciation

Reconstruction of North American drainage basins and river discharge since the Last Glacial Maximum

Exploring the extent to which fluctuations in ice‐rafted debris reflect mass changes in the source ice sheet: a model–observation comparison using the last British–Irish Ice Sheet

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