There are small, rapid variations attributable to El Niño and other ocean currents such as the Gulf Stream; because of such oscillations, the «flattening» of the recent temperature rise that some people claim is not, in our view, statistically significant. (nytimes.com)
Physicists call such oscillations the giant dipole resonance. (sciencedaily.com)
Such oscillations occur naturally as the irregular nucleus rotates about its spin axis and reflects different amounts of sunlight during a rotation cycle. (keckobservatory.org)