Sea-level constraints on the amplitude and source distribution of Meltwater Pulse 1A
Liu, J.; Milne, G.A.; Kopp, R.E.; Clark, P.U.; Shennan, I.
During the last deglaciation, sea levels rose as ice sheets retreated. This climate transition was punctuated by periods of more intense melting; the largest and most rapid of these—Meltwater Pulse 1A—occurred about 14,500 years ago, with rates of sea-level rise reaching approximately 4 m per century1, 2, 3. Such rates of rise suggest ice-sheet instability, but the meltwater sources are poorly constrained, thus limiting our understanding of the causes and impacts of the event4, 5, 6, 7. In particular, geophysical modelling studies constrained by tropical sea-level records1, 8, 9 suggest an Antarctic contribution of more than seven metres, whereas most reconstructions10 from Antarctica indicate no substantial change in ice-sheet volume around the time of Meltwater Pulse 1A. Here we use a glacial isostatic adjustment model to reinterpret tropical sea-level reconstructions from Barbados2, the Sunda Shelf3 and Tahiti1. According to our results, global mean sea-level rise during Meltwater Pulse 1A was between 8.6 and 14.6 m (95% probability). As for the melt partitioning, we find an allowable contribution from Antarctica of either 4.1 to 10.0 m or 0 to 6.9 m (95% probability), using two recent estimates11, 12 of the contribution from the North American ice sheets. We conclude that with current geologic constraints, the method applied here is unable to support or refute the possibility of a significant Antarctic contribution to Meltwater Pulse 1A.
Liu, J., Milne, G., Kopp, R., Clark, P., & Shennan, I. (2016). Sea-level constraints on the amplitude and source distribution of Meltwater Pulse 1A. Nature Geoscience, 9(2), 130-134. https://doi.org/10.1038/ngeo2616
|Journal Article Type||Article|
|Acceptance Date||Nov 10, 2015|
|Online Publication Date||Dec 21, 2015|
|Publication Date||Feb 1, 2016|
|Deposit Date||Jan 20, 2016|
|Publicly Available Date||Jun 21, 2016|
|Peer Reviewed||Peer Reviewed|
Accepted Journal Article
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