ScienceDaily (Apr. 3, 2012) — Scientists have found a large reduction in the amount of the coldest deep ocean water, called Antarctic Bottom Water, all around the Southern Ocean using data collected from 1980 to 2011. These findings, in a study now online, will likely stimulate new research on the causes of this change.
http://www.sciencedaily.com/releases/2012/04/120403153850.htm