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Pleistocene Epoch
Background: By using the dipstick approach, researchers can determine how much glacial meltwater the LIS contributed to the global sea level rise observed from 19-11.7 ka.

The Oldest Dryas Liz
a weak AMOC in the N.H. resulted in average winter temperatures 32°C colder than today. In contrast, heat was being trapped in the S.H. which caused Southern ice sheets to melt and release CO2 which in turn caused greenhouse gas warming that caused Northward flow of warm water

Meltwater Pulse 1a
Thinning of the LIS was caused by rapid warming of the Northern Hemisphere produced by a sudden shift towards an interstadial AMOC from 14.6-14.3 ka, a period also known as the Bølling warming. This change in climate caused global sea levels to rise 9-15 m due to deglaciation of Northern Hemisphere ice sheets.

It is uncertain what particular ice sheets contributed the most to the significant sea level rise, but evidence collected from cosmogenic nucleotide dating indicates rapid thinning of the Laurentide Ice Sheet during the Meltwater Pulse 1a (MWP-1A) which could mean the LIS was a main source of glacial meltwater during this time.

The Younger Dryas and Onset of the Holocene
After MWP-1A, around 12.9 ka, the Northern hemisphere experienced a sudden drop in temperatures caused by a reduction in the AMOC towards a stadial mode, which is implicated to be caused by the influx of glacial meltwater from the LIS and is a period known as the Younger Dryas. The AMOC recovered back to an interstadial mode by 11.7 ka which marked the beginning of the Holocene Epoch.

(Meltwater Pulse 1a
Thinning of the LIS was caused by rapid warming of the Northern Hemisphere produced by a sudden shift towards an interstadial AMOC from 14.6-14.3, also known as the Bolling warming.


 * This change in climate caused global sea levels to rise 9-15 m due to deglaciation of Northern Hemisphere ice sheets (deschamps 2016)
 * It is uncertain what ice sheets contributed the most to the significant sea level rise, but evidence of the rapid thinning of the LIS during the MWP-1A (as suggested by cosmogenic nucleotide dating) points toward the LIS as a main source of glacial meltwater that resulted in the dramatic sea level rise.
 * Researchers are currently applying cosmogenic nucleotide dating to track the thinning rate of the LIS in order to determine if the LIS was a main source of the sea level rise (site guide book, halsted 2018. )
 * By 14.3 ka the LIS had melted and retreated northward such that all of Mount Greylock has become exposed. AMOC stabilized in the interstadial mode
 * By 12.9 there was a sudden reduction in the AMOC that lea

The Younger Dryas
the AMOC shifted to a stadial mode (weak) which is implicated to be caused by the influx of glacial meltwater from the LIS

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Article Evaluation: Wesleyan University Wiki Page
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