Meltwater Pulse 1A – watts with it?

Guest “don’t try not to be picky” by David Middleton

An ancient pulse of meltwater raised the sea level by 18 meters
Meltwater pulse 1A, a period of rapid sea level rise after the last deglaciation, was driven by melting ice from North America and Scandinavia, according to new research.

By Tim Hornyak 24 hours ago

The period in which the sea level shot up at the end of the last ice age about 14,600 years ago is known as meltwater pulse 1A (MWP-1A). Since this pulse was identified from coral records in 1989, the origin of the meltwater has been controversial. Some researchers have hypothesized that Antarctica was the main source of the meltwater, while other scientists suggest it came from the northern hemisphere.

A new study by Nature Communications concluded that melting ice sheets in North America, followed by Scandinavia, were the dominant driving forces for MWP-1A, and that the global mean sea level rise over 500 years was 17.9 meters.



The Climatariat has been desperate to blame Meltwater Pulse 1A for the instability of the Antarctic Sea Ice Cliffs (MICI) since it was first identified in 1989, right after Al Gore invented global warming. Their figurehead for this phenomenon was the Greenland glacier Jakobshavn Isbrae, which suddenly stopped cooperating in 2016. The climatariat quickly changed the chicken little cackling of “Run Away! The glaciers are shrinking! ”Run away! The glaciers are growing! “

The paper, Lin et al., 2021, supports the obvious explanation of Meltwater Pulse 1A.

Figure 1. Deglaciation from the late Pleistocene to the early Holocene. (State Museum Illinois)

The full text of the paper is available and worth reading. The Eos article, on the other hand …

Meltwater pulse 1A, a time of rapid sea level rise after the last deglaciation …


Meltwater Pulse 1A (MWP 1A) occurred relatively early during the last deglaciation, not after.

Figure 2. Global increase in seal level during the Holocene transgression. MWP 1A occurred at ~ 14.6 kya. Note that the error bar is ± 12 meters.
(Siddall et al., 2003)

Then there was the mandatory and free …

Insights into climate change today
Yusuke Yokoyama, a professor at the Atmosphere and Ocean Research Institute at the University of Tokyo who was not involved in the study, said the new research is a possible answer to the question of meltwater sources for MWP-1A, but the debate is far from over .


The main criterion of the “not participating in the study” professor was the choice of the radiometric dating method … At no point in time has a contribution to the article provided “Insights into climate change today” because there are none.


Hornyak, T. (2021), An old meltwater pulse raised the sea level by 18 meters, Eos, 102, Published on June 2nd, 2021.

Lin, Y., Hibbert, FD, Whitehouse, PL et al. A fine-tuned solution from Meltwater Pulse 1A sources using fingerprints at sea level. Nat Commun 12, 2015 (2021).

Siddall M, Rohling EJ, Almogi-Labin A, Hemleben C, Meischner D, Smelzer I, Smeed DA (2003). “Sea level fluctuations during the last ice age cycle”. Nature 423: 853-858

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