Laurence Hecht writes:
This review in the 19 Jun 2015 issue of Science reported solid observational evidence (not proxies and modeling à la Rahmstorf and Mann) of a 10-year trend of decline in the Atlantic Conveyor. It’s not long enough to prove anything, but it’s solid data based on a string of tethered buoys stretching across the Atlantic from the coasts of Florida to Africa at 26.5ºN.
It is important to note that 10 years worth of data really isn’t long enough to make any long term prediction about the state of the AMOC. Other recent studies have suggested that there is no long term declining trend:
New NASA measurements of the Atlantic Meridional Overturning Circulation, part of the global ocean conveyor belt that helps regulate climate around the North Atlantic, show no significant slowing over the past 15 years. The data suggest the circulation may have even sped up slightly in the recent past.