Fram StraitArctic sediments from 150,000 years ago show Atlantic inflow stopped.

A Communications Earth & Environment study says only a total Atlantic inflow shutdown fits the readings.

Atmospheric beryllium-10 against land-derived beryllium-9 fell to riverine ratios in glacial sediment cores from the Arctic and Nordic Seas.

The authors say current dating cannot tell whether one North Atlantic core’s minimum marks the glacial peak or deglaciation.

The authors read a North Atlantic dip as stored Arctic water spilling out when the link reopened.

How each outlet framed it
Nature
tests 10Be/9Be ratios against riverine versus North Atlantic signatures to prove the Arctic Mediterranean was cut off during MIS 4 and MIS 6

Sources: Nature