Ok, I did some checking. It was noted in 1969, and persisted for several
years.

"Steve Thomas" wrote in message
. ..

Sometime in the recent past, there was an event that was generally called
the "great salinity anomoly" in the North Atlantic. There was a large
patch
of lower salinity water that the scientists were at a loss to explain. I
don't remember exactly when it was, but I don't think it was more than 10
years ago.