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TitleLake Agassiz Final drainage event in the northwest North Atlantic
AuthorHillaire-Marcel, C; de Vernal, A; Piper, D J WORCID logo
SourceGeophysical Research Letters vol. 34, L15601, 2007, 5 pages, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20070249
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthern offshore region; Eastern offshore region
AreaLabrador Sea; Labrador Margin; Labrador Shelf; Labrador Slope
Lat/Long WENS -64.0000 -44.0000 60.0000 44.0000
Subjectssurficial geology/geomorphology; marine geology; glacial history; glacial lakes; deglaciation; drainage; drainage systems; Holocene; sedimentary rocks; paleoclimates; oceanography; paleogeography; Lake Agassiz; Quaternary
Illustrationssketch maps; graphs
ProgramGeoscience for Oceans Management Geohazards and Constraints to Offshore Development
ProgramCFCAS - Canadian Foundation for Climate and Atmospheric Sciences
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
ProgramFonds québecois de la recherche sur la nature et les technologies
Released2007 08 02
AbstractThe 8.2ka "climate" event recorded in Greenland ice cores is subject of debates with respect to causal linkage with a collapse of the Atlantic Meridional Overturning due to the drainage of the late-glacial lake Agassiz.Here, we present records from the NW North Atlantic, down-current the flood discharge route, showing that the 9.5 - 8 ka interval was marked by a succession of events. The drainage itself corresponds to a twin-layer of carbonate-rich turbidites deposited within the calibrated 8.35 - 8.5 ka interval. Proxies of sea-surface and deep-current conditions do not indicate significant concomitant changes in the NW North Atlantic. The dataset, however, supports the concept that the 8.2ka "climate" event may represent one of the manifestations of climate instability during an interval with major changes of land drainage in NE America, due to the collapse of the Laurentide Ice Sheet, subsequent fast sea level rise and large scale reorganization of the North Atlantic thermohaline circulation pattern.

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