Meltwater Pulse 1A from Antarctica as a Trigger of the Bølling-Allerød Warm Interval

Meltwater pulse 1A (mwp-1A) was a prominent feature of the last deglaciation, which led to a sea-level rise of ∼20 meters in less than 500 years. Concurrent with mwp-1A was the onset of the Bølling-Allerød interstadial event (14,600 years before the present), which marked the termination of the last...

Full description

Bibliographic Details
Published in:Science
Main Authors: Weaver, Andrew J., Saenko, Oleg A., Clark, Peter U., Mitrovica, Jerry X.
Format: Article in Journal/Newspaper
Language:English
Published: American Association for the Advancement of Science (AAAS) 2003
Subjects:
Antarctic
The Antarctic
Antarc*
Antarctica
Fennoscandian
Ice Sheet
NADW
North Atlantic Deep Water
North Atlantic
Online Access:http://dx.doi.org/10.1126/science.1081002
https://www.science.org/doi/pdf/10.1126/science.1081002
Description
Summary:Meltwater pulse 1A (mwp-1A) was a prominent feature of the last deglaciation, which led to a sea-level rise of ∼20 meters in less than 500 years. Concurrent with mwp-1A was the onset of the Bølling-Allerød interstadial event (14,600 years before the present), which marked the termination of the last glacial period. Previous studies have been unable to reconcile a warm Northern Hemisphere with mwp-1A originating from the Laurentide or Fennoscandian ice sheets. With the use of a climate model of intermediate complexity, we demonstrate that with mwp-1A originating from the Antarctic Ice Sheet, consistent with recent sea-level fingerprinting inferences, the strength of North Atlantic Deep Water (NADW) formation increases, thereby warming the North Atlantic region and providing an explanation for the onset of the Bølling-Allerød warm interval. The established mode of active NADW formation is then able to respond to subsequent freshwater forcing from the Laurentide and Fennoscandian ice sheets, setting the stage for the Younger Dryas cold period.

Similar Items