Oceans warmed steadily over 12,000 years: study
Earth’s oceans have been warming consistently throughout the last 12,000 years, according to research published Wednesday that authors said showed clearly humanity’s profound effect on the climate. Previous estimates of sea temperatures stretching back millennia have traditionally been based on analysis of preserved rock, and concluded that oceans hit their temperature peak around 6,000 years ago before gradually cooling. This is at odds with global air temperature records, which tell the tale of a consistent warming trend, accelerating at the onset of the industrial era. Researchers in the U.S. and China reassessed sea temperature models and found that they usually represented seasonal temperature variations rather than the annual average. Adjusting for these seasonal discrepancies, they found that sea temperatures have in fact risen more or less in lock step with global air temperatures over the last 12,000 years.