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Have you ever noticed that when Trump doubles down on one of his idiotic moves, it is taken as evidence that he's even stupider than thought? I have never said that ocean circulation doesn't change over time. I have never said that changes in ocean circulation couldn't affect climate, particularly regionally. I'm saying that changes in ocean circulation are NOT responsible for the glacial-interglacial cycle nor are they responsible for the warming observed over the past 150 years. That no one has dedicated a study to refuting your contention is simply prima facie evidence that your contention has never been considered a hypothesis worthy of the least pursuit.
And yet overwhelming evidence shows ocean currents are responsible for abrupt warming climate changes and cooling climate changes. The exact same type of abrupt climate changes seen at the transition from interglacial periods to glacial periods.

So if you believe ocean circulation can affect climate you must believe ocean currents can be responsible for warming and cooling trends.

Changes in heat transfer to the Arctic from the Atlantic have global implications. If the Arctic is glaciating the planet is cooling. If the Arctic is deglaciating the planet is warming. No other REGIONAL changes have global implications other than the Arctic.
 
And yet overwhelming evidence shows ocean currents are responsible for abrupt warming climate changes and cooling climate changes. The exact same type of abrupt climate changes seen at the transition from interglacial periods to glacial periods.

So if you believe ocean circulation can affect climate you must believe ocean currents can be responsible for warming and cooling trends.

Changes in heat transfer to the Arctic from the Atlantic have global implications. If the Arctic is glaciating the planet is cooling. If the Arctic is deglaciating the planet is warming. No other REGIONAL changes have global implications other than the Arctic.
Ignoring their inability to produce global changes, your problem all along - and one you have never addressed - is that the glacial-interglacial cycle is periodic and changes in ocean currents are not. End of story.
 
Have you ever heard the term "one-trick pony"?
The last ice age wasn't one long big chill. Dozens of times temperatures abruptly rose or fell, causing all manner of ecological change. Mysteriously, ice cores from Greenland and Antarctica show that these sudden shifts—which occurred every 1500 years or so—were out of sync in the two hemispheres: When it got cold in the north, it grew warm in the south, and vice versa. Now, scientists have implicated the culprit behind those seesaws—changes to a conveyor belt of ocean currents known as the Atlantic Meridional Overturning Circulation (AMOC).

These currents, which today drive the Gulf Stream, bring warm surface waters north and send cold, deeper waters south. But they weakened suddenly and drastically, nearly to the point of stopping, just before several periods of abrupt climate change, researchers report today in Science. In a matter of decades, temperatures plummeted in the north, as the currents brought less warmth in that direction. Meanwhile, the backlog of warm, southern waters allowed the Southern Hemisphere to heat up.

AMOC slowdowns have long been suspected as the cause of the climate swings during the last ice age, which lasted from 110,000 to 15,000 years ago, but never definitively shown. The new study "is the best demonstration that this indeed happened," says Jerry McManus, a paleo-oceanographer at Columbia University's Lamont-Doherty Earth Observatory, and a study author. "It is very convincing evidence," adds Andreas Schmittner, a climate scientist at Oregon State University, Corvallis. "We did not know that the circulation changed during these shorter intervals."

 
The last ice age wasn't one long big chill. Dozens of times temperatures abruptly rose or fell, causing all manner of ecological change. Mysteriously, ice cores from Greenland and Antarctica show that these sudden shifts—which occurred every 1500 years or so—were out of sync in the two hemispheres: When it got cold in the north, it grew warm in the south, and vice versa. Now, scientists have implicated the culprit behind those seesaws—changes to a conveyor belt of ocean currents known as the Atlantic Meridional Overturning Circulation (AMOC).
For the umpteenth time, this is not describing the glacial-interglacial cycle.
These currents, which today drive the Gulf Stream, bring warm surface waters north and send cold, deeper waters south. But they weakened suddenly and drastically, nearly to the point of stopping, just before several periods of abrupt climate change, researchers report today in Science. In a matter of decades, temperatures plummeted in the north, as the currents brought less warmth in that direction. Meanwhile, the backlog of warm, southern waters allowed the Southern Hemisphere to heat up.
Not addressing the glacial-interglacial cycle.
AMOC slowdowns have long been suspected as the cause of the climate swings during the last ice age, which lasted from 110,000 to 15,000 years ago, but never definitively shown. The new study "is the best demonstration that this indeed happened," says Jerry McManus, a paleo-oceanographer at Columbia University's Lamont-Doherty Earth Observatory, and a study author. "It is very convincing evidence," adds Andreas Schmittner, a climate scientist at Oregon State University, Corvallis. "We did not know that the circulation changed during these shorter intervals."
Not addressing the glacial-interglacial cycle.
You have not presented a SINGLE REFERENCE that has stated, suggested or even hinted that changes in ocean currents are responsible for the glacial-interglacial cycle. Why can you not see that you are wrong? Are you under the impression that your hypothesis is of diving origin?
 
For the umpteenth time, this is not describing the glacial-interglacial cycle.

Not addressing the glacial-interglacial cycle.

Not addressing the glacial-interglacial cycle.

You have not presented a SINGLE REFERENCE that has stated, suggested or even hinted that changes in ocean currents are responsible for the glacial-interglacial cycle. Why can you not see that you are wrong? Are you under the impression that your hypothesis is of diving origin?
...direct evidence for the ocean’s persistent, central role in abrupt glacial climate change.

https://www.science.org/doi/10.1126...6472541199F70A4C98A6%40AdobeOrg|TS=1723213472
 

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