A new study show that the thermohaline circulation is slowing down. This just recently published in a peer-reviewed study in the journal Nature.
Nature July 18, 2018 Global surface warming enhanced by weak Atlantic overturning circulation
There are many articles about the thermohaline circulation but this one is short and to the point
Chicago Tribune April 11, 2018
The Atlantic meridional overturning circulation has declined in strength by 15 percent since the mid-20th century to a “new record low,” the scientists conclude…The Atlantic meridional overturning circulation has declined in strength by 15 percent since the mid-20th century to a “new record low…If the slowdown trend continues, it is expected to drive strong sea-level rise against the Eastern Seaboard. Previous research has already shown that in 2009 to 2010, sea level in the region suddenly shot up five inches, thanks in part to a brief slowdown of the circulation…As for the future, Rahmstorf predicts the circulation will only weaken further as climate change advances. It may not be slow and steady: There is great fear that there may be a “tipping point” where the circulation comes to an abrupt halt.
NASA video of the AMOC (Atlantic meridional overturning circulation)