 The 60- to 80-year cycle of the atmospheric and oceanic variability over the North Atlantic was also linked to the hiatus by two studies published in 2013 and was used to infer the length of the hiatus.A new "delayed oscillator theory" of the North Atlantic decadal-scale air-sea coupling was further proposed in 2015 to understand the underlying physical mechanisms of the 60-80-year-quasi-periodic natural climate multidecadal variability.Two papers were published by scientists of the NASA Sea Level Change Team in October 2014 in the same issue of "Nature Climate Change".