* on the west Atlantic coast 200km North of Cape Hatteras, sea surface was even 1 to 4°C cooler. …
While Tasmania's and Europe's North Atlantic's sea surface proxies recorded 16 to 20°C hotter water than today.
Which means to my un-learned mind that AMOC existed but totally without the wind-driven Gulfstream? "
The sediment core on New Jersey's coast is only 1 data point, tho. Can't use it to speculate about Gulfstream strength.
It might be an indication that the Gulfstream left the coast to flow East somewhere else, for example further South than nowadays.
Which … puts the jetstream further South than nowadays too, I guess.
Or maybe it was just sedimental pot luck? Nowadays, sea surface °C experiences ENSO-like ups and downs in that area between Cape Hatteras and New Jersey. The mood swings can be 16°C. It seems at least possible that the stretch in the sediment core was from such a negative swing while the actual regional average was about the same or warmer or hotter even.