The paper reports some results on the role of large scale circulation changes (which they conclude are minor) but I'll concentrate on the results relating to water vapor. (realclimate.org)
But after looking at several graphs that contain the last 17 years I don't see what you are talking about with regards to large scale circulation anomalies. (planet3.org)
One way to do this is to decrease the strength of large scale circulations like the Walker and Hadley circulations. (realclimate.org)