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Catastrophic drainage from the northwestern outlet of glacial Lake Agassiz during the Younger Dryas

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dc.contributor.authorNorris, S. L.
dc.contributor.authorGarcia-Castellanos, D.
dc.contributor.authorJansen, J. D.
dc.contributor.authorCarling, P. A.
dc.contributor.authorMargold, M.
dc.contributor.authorWoywitka, Robin
dc.contributor.authorFroese, D. G.
dc.date.accessioned2022-05-26
dc.date.accessioned2022-05-31T01:51:00Z
dc.date.available2022-05-31T01:51:00Z
dc.date.issued2021
dc.description.abstractCatastrophic meltwater drainage from glacial Lake Agassiz has been hypothesised as a trigger for large-scale ocean circulation change initiating the Younger Dryas cold reversal. Here we quantify the flood discharge that formed the northwestern outlet of Lake Agassiz using a one-dimensional step-backwater model and a zero-dimension gradual-incision model. Applying these two independent models, we estimate a peak discharge range of 1.8-2.5 × 106 m3 s-1 and a flood volume of ~21,000 km. Such a discharge can only be derived from Lake Agassiz rather than one of the two smaller regional glacial lakes: Churchill or Meadow. When coupled with existing ice margin chronologies, these results demonstrate that the northwestern outlet of Lake Agassiz provides a viable link for catastrophic meltwater to drain to the Arctic Ocean over a 5-10 month period during the Younger Dryas, though it is unclear whether this was near its beginning.
dc.format.extent1.64MB
dc.format.mimetypePDF
dc.identifier.citationNorris, S.L., Garcia-Castellanos, D., Jansen, J.D., Carling, P.A., Margold, M., Woywitka, R., and Froese, D.G. (2021). Catastrophic drainage from the northwestern outlet of glacial Lake Agassiz during the Younger Dryas. Geophysical Research Letters, 48, e2021GL093919. https://doi.org/10.1029/2021GL093919
dc.identifier.doihttps://doi.org/10.1029/2021GL093919
dc.identifier.urihttps://hdl.handle.net/20.500.14078/2672
dc.languageEnglish
dc.language.isoen
dc.rightsAll Rights Reserved
dc.subjectLake Agassiz
dc.subjectYounger Dryas
dc.subjectmeltwater drainage
dc.titleCatastrophic drainage from the northwestern outlet of glacial Lake Agassiz during the Younger Dryasen
dc.typeArticle Post-Print

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