Keith Briffa, from the University of East Anglia's Climatic Research Unit, said the tropical ocean regions were among the more reliable areas from which to infer large-scale temperature changes.
Tri-Amping - A technique commonly used in large-scale sound amplification for concerts, Tri-amping is the practice of connecting three audio amplifiers to a loudspeaker unit: one to power the bass driver (woofer), one to power the mid-range and the third to power the treble driver (tweeter).