Speaking of reviewing other papers on climate networks, [Tupikina et al. (2014)](http://www.nonlin-processes-geophys.net/21/705/2014/npg-21-705-2014.html) could be interesting. I'm not sure if it's been mentioned here yet. One result from the abstract: "While this real-world [common component evolution function] displays a high degree of network persistence over large time lags, there are distinct time periods when common links break down. This phasing of these events coincides with years of strong El Niño/Southern Oscillation phenomena, confirming previous studies."