Deglacial ocean warming and marine margin retreat of the Cordilleran Ice Sheet in the North Pacific Ocean

Taylor, M.; Hendy, I. L.; Pak, Dorothy K.

doi:10.1016/j.epsl.2014.06.026

Cited by 49 publications

(70 citation statements)

References 94 publications

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“…Correlative moraines located short distances beyond, or partly covered by, Little Ice Age moraines are found in the national parks in the southern Rocky Mountains of Alberta (Luckman and Osborn, 1979), Waterton Lakes National Park (Osborn, 1985), upper Elk Valley in the British Columbia Rocky Mountains (Ferguson, 1978), Mount Assiniboine Provincial Park (Menounos et al, 2009), and the Purcell and Selkirk mountains ( Figure 1; Menounos et al, 2009). An advance of cirque and valley glaciers during the Younger Dryas is consistent with paleoecological data (Mathewes et al, 1993;Taylor et al, 2014) that indicate a return to cold conditions along British Columbia's west coast at that time.…”

Section: The Final Demise Of the Ice Sheetsupporting

confidence: 65%

Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene

Clague

2017

CIG

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Section: The Final Demise Of the Ice Sheetsupporting

confidence: 65%

Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene

Clague

2017

CIG

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“…Geophysical Research Letters retreat of the Puget and Juan de Fuca ice lobes Taylor et al, 2014; Figure 4e).…”

Section: 1029/2018gl079419mentioning

confidence: 99%

Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation

Darvill

Menounos

Goehring

et al. 2018

Geophysical Research Letters

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The timing of Cordilleran Ice Sheet deglaciation along the central coast of British Columbia, Canada, informs climate forcing and early human migration. Thirty-two 10 Be exposure ages from glacial erratics and local bedrock on the western margin of the former ice sheet represent the earliest exposure ages for the Cordilleran Ice Sheet during the last deglaciation. These data show the western ice margin was retreating by 18.1 ± 0.2 ka, consistent with the global record of ice mass loss. In contrast, parts of the southern margin reached a maximum at ca. 17.6-16.6 ka, and our data demonstrate a diachronous response of the Cordilleran Ice Sheet during deglaciation. We also show that a low altitude site was exposed by at least 17.7 ± 0.3 ka, implying that numerous ice-free areas existed along the coastal margin by this time, providing a viable route for the first humans entering the Americas.Plain Language Summary Large ice sheets have advanced and retreated multiple times over the last several hundred thousand years in response to cyclical changes in incoming solar radiation. The Cordilleran Ice Sheet, which once covered much of western Canada, was thought to have advanced and retreated later than others during its last major cycle. The retreat of this ice sheet also opened routes that allowed the first people to enter the Americas. We show that the western margin of the ice sheet retreated earlier than previously thought. Other margins of the ice sheet advanced later, creating a complex picture through time. The early retreat of the western ice margin exposed numerous islands that could have been used by early people migrating southward.

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“…Thus, it is a good predictor of changes in drainage basin area, but is somewhat less effective at predicting past river discharge, especially when that discharge is strongly influenced by ice-sheet melt. Discharge inferences continue to be aided by the growing database of paleoceanographic proxy records (e.g., Keigwin et al, 2006;Obbink et al, 2010;Williams et al, 2012;HillaireMarcel et al, 2013;Taylor et al, 2014;Gibb et al, 2014;Gil et al, 2015), improved geochemical techniques to produce richer records that also reduce or quantify uncertainties (e.g., Vetter, 2013;Spero et al, 2015;Khider et al, 2015;Vázquez Riveiros et al, 2016), and continuing work to provide quantitative freshwater discharge estimates based on these data (Carlson et al, 2007a;Carlson, 2009;Obbink et al, 2010;Wickert et al, 2013). Particularly important are records of past water isotopes, past water temperatures, and geochemical signatures of provenance.…”

Section: Drainage Histories By Rivermentioning

confidence: 99%

“…On a global scale, several current flow-routing algorithms could be made global for better integration with ice-sheet, climate, and GIA models (Metz et al, 2011;Qin and Zhan, 2012;Braun and Willett, 2013;Huang and Lee, 2013;Schwanghart and Scherler, 2014), with the possibility to include highresolution flow routing as part of a transient coupled GCM instead of an a posteriori analysis, as is presented here. Finally, high-resolution drainage routing schemes can connect models of past climate, ice sheets, and drainage routing to oxygen isotopes in sediment cores The increasingly complete collection of such records from the North American continent and continental margin (e.g., Hooke and Clausen, 1982;Remenda et al, 1994;Andrews et al, 1994;de Vernal et al, 1996;Birks et al, 2007;Carlson et al, 2007aBreckenridge and Johnson, 2009;Lopes and Mix, 2009;Obbink et al, 2010;Brown, 2011;Hoffman et al, 2012;Williams et al, 2012;Gibb et al, 2014;Taylor et al, 2014;Ferguson and Jasechko, 2015;Hladyniuk and Longstaffe, 2016) is opening new possibilities in isotopic studies of whole-ice-sheet mass balance. Pursuit of these targets does not preclude the search for a more representative ice-sheet reconstruction and better ways to integrate models and data.…”

Section: Future Directions: New Ice-sheet Reconstructionsmentioning

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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Deglacial ocean warming and marine margin retreat of the Cordilleran Ice Sheet in the North Pacific Ocean

Cited by 49 publications

References 94 publications

Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene

Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene

Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation

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

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