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|a A subtropical fate awaited freshwater discharged from glacial Lake Agassiz |h [electronic resource] |y English. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a The 8.2 kyr event is the largest abrupt climatic change recorded in the last 10,000 years, and is
widely hypothesized to have been triggered by the release of thousands of kilometers cubed of
freshwater into the North Atlantic Ocean. Using a high-resolution (1/6°) global, ocean-ice
circulation model we present an alternative view that freshwater discharged from glacial Lake
Agassiz would have remained on the continental shelf as a narrow, buoyant, coastal current, and would have been transported south into the subtropical North Atlantic. The pathway we describe is in contrast to the conceptual idea that freshwater from this lake outburst spread over most of the sub-polar North Atlantic, and covered the deep, open-ocean, convection regions. This coastally confined freshwater pathway is consistent with the present-day routing of freshwater from Hudson Bay, as well as paleoceanographic evidence of this event. Using a coarseresolution (2.6°) version of the same model, we demonstrate that the previously reported spreading of freshwater across the sub-polar North Atlantic results from the inability of
numerical models of this resolution to accurately resolve narrow coastal flows, producing instead
a diffuse circulation that advects freshwater away from the boundaries. To understand the
climatic impact of freshwater released in the past or future (e.g. Greenland and Antarctica), the
ocean needs to be modeled at a resolution sufficient to resolve the dynamics of narrow, coastal
buoyant flows. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a North atlantic region. |
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|t A subtropical fate awaited freshwater discharged from glacial Lake Agassiz |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062010/00001 |y Click here for full text |
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|3 Host material |u http://onlinelibrary.wiley.com/doi/10.1029/2010GL046011/abstract |y A subtropical fate awaited freshwater discharged from glacial Lake Agassiz |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/10/00001/FI15062010_thm.jpg |
