Homogenization is necessary for all climate data to correct for non-climatic changes, such as introduction of different measurement instruments, changes in location of the instruments, or differences in the time of day that measurements are taken [REF].
One proposal is that the hiatus was a part of natural climate variability, specifically related to decadal cooling in the eastern equatorial Pacific in the La Niña phase of the El Niño-Southern Oscillation (ENSO) [REF].