Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse

Gauthier, Michelle; Kelley, Samuel E.; Hodder, Tyler

doi:10.1016/j.epsl.2020.116372

Cited by 16 publications

(18 citation statements)

References 40 publications

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“…The model data suggested a two-step pattern for the final drainage of Lakes Agassiz-Ojibway in separate 3.6 and 1.6 Sv pulses (for a period of 1 year) (Figure 7a), possibly accounting for the two-step structure of 8.2 ka event (Clarke et al, 2004; Teller and Leverington, 2004). Alternatively, three smaller outbursts of Lakes Agassiz-Ojibway occurring between 8.9 and 8.5 ka BP (Figure 7a) and/or the freshwater release from Hudson Bay Ice Saddle collapse around 8.6 ka BP may be responsible for the climate anomaly proceeding the 8.2 ka event (Gauthier et al, 2020). Similarly, the two-step structure was also observed for some climate anomalies during mid and late-Holocene, such as 7.2, 5.5, and 2.8 ka events, which was suggested to be caused by the declined solar activity, whose impact was possibly amplified by the coeval freshwater discharge and/or shift of Inter-tropical Convergence Zone (ITCZ) (Feng et al, 2020; Tan et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Timing and structure of early-Holocene climate anomalies inferred from north Chinese stalagmite records

Duan

Cheng

et al. 2021

The Holocene

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In this paper, a new decadal resolution stalagmite δ18O record covering 10.4–6.5 ka BP from Kulishu cave in Beijing, north China is presented in combination with the published stalagmite δ18O record covering 10.4–14.0 ka BP in the same cave. Five significant monsoon collapses were identified around 11.5, 11.0, 10.0, 9.4, and 8.2 ka BP as well as three smaller ones around 10.3, 9.0, and 8.6 ka BP. The weak monsoon episodes around 8.6 and 8.2 ka BP form the two-step structure of the 8.2 ka event. All monsoon collapses, coeval with the cooling in northern high-latitude records, are correlated with Lakes Agassiz-Ojibway outbursts. Thus, our data support the idea of freshwater forcing of abrupt climate anomalies during the early Holocene. Nevertheless, the decreased irradiance together with freshwater outburst may account for the 9.2/9.3 ka event, which is expressed more significantly in low-latitude records.

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Section: Discussionmentioning

confidence: 99%

Timing and structure of early-Holocene climate anomalies inferred from north Chinese stalagmite records

Duan

Cheng

et al. 2021

The Holocene

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“…Collapse of ice over Hudson Bay initiated at ~8.57±0.28 and was completed shortly after 8.11±0.19 ka BP (analyses within Gauthier et al . 2020). Most radiocarbon ages provide minimum ages for deglaciation (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Glaciolacustrine ages used to bracket final drainage of Lake Agassiz and the collapse of the Hudson Bay Ice Saddle, reported in Gauthier et al . (2020), were recalibrated using CALIB 8.2 (Stuiver et al . 2020).…”

Section: Methodsmentioning

confidence: 99%

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Patterns of ice recession and ice stream activity for the MIS 2 Laurentide Ice Sheet in Manitoba, Canada

Gauthier

Breckenridge²,

Hodder

2021

Boreas

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Reconstruction of deglacial ice margins provides insights into the demise of past ice sheets and ice‐marginal lakes and helps to understand how former ice sheets responded to climate change. Here, we reconstruct deglacial Laurentide Ice Sheet margins across Manitoba (Canada), a dynamic region that in MIS 2 spanned from an inner core region of the Keewatin dome to the periphery of the ice sheet (~900 km north of the Last Glacial Maximum limit). The area was also overrun by ice flowing from both the Quebec‐Labrador dome and the Hudson Bay Ice Saddle. The surficial landscape of Manitoba contains inherited relict and palimpsest glacial landscapes, which need to be separated from deglacial features. Ice‐impounded glacial Lake Hind was present in southwest Manitoba at 13.0 cal. ka BP, meaning most of Manitoba was covered by ice at the start of the Younger Dryas. Northwest drainage of glacial Lake Agassiz in front of the Highrock Lake–Cree Lake moraine could have occurred near the end of the Younger Dryas, prior to 11.5 cal. ka BP, though the volume of the lake varies greatly depending on ice‐margin reconstructions. Our interpretation is incompatible with the hypothesis that Lake Agassiz drainage to the Arctic Ocean triggered the Younger Dryas climatic cooling. Numerous ice streams developed across central and southern Manitoba during deglaciation, including the Souris, Red River, The Pas, Hayes and Quinn Lake. The dominant ice source was from the north early in deglaciation, switching to the northeast with growth of the Hudson Bay Ice Saddle and then back to the north again with demise of the saddle. The ice‐margin ages are largely unconstrained, and thus we are unable to accurately assign climatic drivers to various ice stream events. Nonetheless, we record the development and demise of terrestrial ice streams over both hard‐bed and soft‐bed substrates.

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“…Reconstructions of the history of Lake Agassiz have concluded that the lake had drained away by ~8.4 ka (Klassen, 1983; Barber et al, 1999; Dyke, 2004; Dalton et al, 2020), although there is evidence that this drainage spanned several centuries (e.g. Klassen, 1983; Teller et al, 2002; Clarke et al, 2004; Gauthier et al, 2020; Godbout et al, 2020). Given that the elevation of Gimli beach is one of the lowest in the southern Agassiz basin, the age of Gimli beach should be between ~8.4 ka and the ~10.6‐ka age of Campbell beach 80 m above Gimli beach.…”

Section: New Osl Data and Interpretationmentioning

confidence: 99%

Age of Gimli beach of Lake Agassiz based on new OSL dating

Teller

Owen

2020

J Quaternary Science

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Gimli beach in Manitoba is one of the lowest elevation beaches in the southern Lake Agassiz basin, and is a distinct ridge composed of bedded sand and gravel that rises above the lake plain and extends for more than 40 km. Ten new optically stimulated luminescence (OSL) ages from Gimli beach yield ages mostly ranging from 9.7 ± 0.7 to 10.5 ± 0.8 ka (average 10.3 ± 0.5 ka), which is older by 0.6 to >1.0 ka than age estimates of previous researchers. Two of our new OSL ages are notably older than the others, dating to~11.3 ± 0.8 and 13.9 ± 1.0 ka, which we attribute to poorly bleached sands. We ascribe an age of about 10 ka to Gimli beach, which is several centuries before overflow from Lake Agassiz and its vast drainage basin shifted from the western Great Lakes to glacial Lake Ojibway and the St. Lawrence Valley.

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Lake Agassiz drainage bracketed Holocene Hudson Bay Ice Saddle collapse

Cited by 16 publications

References 40 publications

Timing and structure of early-Holocene climate anomalies inferred from north Chinese stalagmite records

Timing and structure of early-Holocene climate anomalies inferred from north Chinese stalagmite records

Patterns of ice recession and ice stream activity for the MIS 2 Laurentide Ice Sheet in Manitoba, Canada

Age of Gimli beach of Lake Agassiz based on new OSL dating

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