Southern Laurentide ice-sheet retreat synchronous with rising boreal summer insolation

Ullman, David G.; Carlson, Anders E.; LeGrande, Allegra N.; Anslow, F. S.; Moore, Angus K.; Caffee, Marc W.; Syverson, Kent M.; Licciardi, Joseph M.

doi:10.1130/g36179.1

Cited by 71 publications

(71 citation statements)

References 21 publications

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“…In this context, it is generally accepted that the initial trigger for deglaciation was an increase in boreal summer insolation Ullman et al, 2015a). However, modelling of the ice sheet's net surface mass balance indicates that it remained positive until around 11 ka (Ullman et al, 2015b).…”

Section: Discussionmentioning

confidence: 99%

“…Recently, Ullman et al (2015a) pinpointed the initial retreat of the southern margin of the ice sheet in Wisconsin using a suite of 10 Be surface exposure ages from boulder surfaces in terminal moraines. These ages dated the initial retreat of the ice margin from the LLGM moraines to 23.0 ± 0.6 ka, which they noted was synchronous with several other locations along the southern margin and coincided with the initial increase in summer insolation around 24-23 ka.…”

Section: Surface Mass Balance During Deglaciation Of the Lismentioning

confidence: 99%

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Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Stokes

2017

CIG

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ABSTRACT. The last deglaciation of the Laurentide Ice Sheet (LIS) was associated with major reorganisations in the ocean-climate system and its retreat also represents a valuable analogue for understanding the rates and mechanisms of ice sheet collapse. This paper reviews the characteristics of the LIS at its Last GlacialMaximum (LGM) La deglaciación del inlandsis Lauréntide desde el Último Máximo Glaciar RESUMEN. La última deglaciación del inlandsis Lauréntide (LIS) estuvo relacionada con grandes reorganizaciones en el océano-clima y su retroceso representa un valioso ejemplo para comprender las tasas y mecanismos del colapso del inlandsis. Este artículo revisa las características del LIS en su Último Máximo Glaciar (LGM) y su consiguiente deglaciación, con especial énfasis en

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Section: Discussionmentioning

confidence: 99%

Section: Surface Mass Balance During Deglaciation Of the Lismentioning

confidence: 99%

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Stokes

2017

CIG

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“…It appears that initial retreat of the western margin of the SBIS occurred as early as ∼23 ka, synchronous with the initial rise in boreal summer insolation at ∼24–23 ka and consistent with the onset of initial retreat of the southern margin of the Laurentide Ice Sheet (e.g. Ullman et al ., ), but pre‐dating any significant rise in eustatic sea level. However, SBIS retreat rates remained relatively slow until at least 17.9 ka and perhaps as late as ∼14.5 ka as suggested by the Isfjorden recession chronology.…”

Section: Coastal Deglaciation Of Western Spitsbergenmentioning

confidence: 99%

Deglaciation of coastal south‐western Spitsbergen dated with in situ cosmogenic ¹⁰Be and ¹⁴C measurements

Young

Lamp

Koffman

et al. 2018

J Quaternary Science

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The Svalbard–Barents ice sheet was predominantly a marine‐based ice sheet and reconstructing the timing and rate of its decay during the last deglaciation informs predictions of future decay of marine‐based ice sheets (e.g. West Antarctica). Records of ice‐sheet change are routinely built with cosmogenic surface exposure ages, but in some regions, this method is complicated by the presence of isotopic inheritance yielding artificially old and erroneous exposure ages for the most recent deglaciation. We present 46 10Be ages from south‐western Spitsbergen that, when paired with in situ 14C measurements (n = 5), constrain the timing of coastal deglaciation following the last glacial maximum. 10Be and in situ 14C measurements from bedrock along a ∼400‐m elevation transect reveal inheritance‐skewed 10Be ages, whereas in situ 14C measurements constrain 400 m of ice‐sheet thinning and coastal deglaciation at 17.4 ± 1.5 ka. Our in situ 14C‐dated transect, combined with three additional 10Be‐dated coastal sites, show that the south‐western margin of the Svalbard–Barents ice sheet retreated out of the Norwegian Sea between ∼18 and 16 ka. In situ 14C measurements provide key chronological information on ice‐sheet response to the last termination in cases where measurements of long‐lived nuclides are compromised by isotopic inheritance.

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“…Perhaps early glacier recession was due to increasing high northern latitude insolation beginning ~23 ka (Berger and Loutre, 1991), which has been hypothesized to have initiated melting of Northern Hemisphere ice sheets (e.g., Alley et al, 2002;Denton et al, 2010;Ullman et al, 2015). Pendleton et al (2015) suggested that early deglaciation in the Brooks Range may have also been related to the impact that the expanded Laurentide Ice Sheet had on atmospheric circulation.…”

Section: How Did the Timing Of Glacier Recession Relate To Buildup Ofmentioning

confidence: 99%

The last deglaciation of Alaska

Briner

Tulenko

Kaufman

et al. 2017

CIG

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Southern Laurentide ice-sheet retreat synchronous with rising boreal summer insolation

Cited by 71 publications

References 21 publications

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Deglaciation of coastal south‐western Spitsbergen dated with in situ cosmogenic ¹⁰Be and ¹⁴C measurements

The last deglaciation of Alaska

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Southern Laurentide ice-sheet retreat synchronous with rising boreal summer insolation

Cited by 71 publications

References 21 publications

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Deglaciation of coastal south‐western Spitsbergen dated with in situ cosmogenic 10Be and 14C measurements

The last deglaciation of Alaska

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Product

Resources

About

Deglaciation of coastal south‐western Spitsbergen dated with in situ cosmogenic ¹⁰Be and ¹⁴C measurements