The paper reference is Rahmstorf, S., Box, J., Feulner, G., Mann, M., Robinson, A., Rutherford, S., Schaffernicht, E. (2015): Exceptional twentieth-Century slowdown in Atlantic Ocean overturning circulation. Nature Climate Change (online) LINK
Tal Ezer. 2015. Detecting changes in the transport of the Gulf Stream and the Atlantic
overturning circulation from coastal sea level data: The extreme decline
in 2009–2010 and estimated variations for 1935–2012 LINK TO PDF
Tal Ezer. 2015. Detecting changes in the transport of the Gulf Stream and the Atlantic
overturning circulation from coastal sea level data: The extreme decline
in 2009–2010 and estimated variations for 1935–2012 LINK TO PDF
www.realclimate.org has nice review of the Rahmsdorf paper and link to graphics etc. LINK