I’ve only taken introductory meteorology courses but I remember ENSO [1] (which uses the term oscillations). Maybe that’s what they’re referring to? [1] https:

I’ve only taken introductory meteorology courses but I remember ENSO [1] (which uses the term oscillations). Maybe that’s what they’re referring to? [1] https://en.m.wikipedia.org/wiki/El_Niño–Southern_Oscillation https://en.m.wikipedia.org/wiki/El_Niño–Southern_Oscillation