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Study: Oceans warmed steadily over 12,000 years
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 US and China reassessed sea temperature models and found that they usually represented seasonal temperature variations rather than the annual average.
La temperatura actual es la más cálida de los últimos 10.000 años
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Their findings, published in
Nature, show that the annual global temperature today is the warmest of the past 10,000 years contrary to recent research.
Some skeptics contend that climate model predictions of future warming must be wrong. The scientists, however, say their findings will challenge long-held views on the temperature history in the Holocene era, which began about 12,000 years ago.
“Our reconstruction shows that the first half of the Holocene was colder than in industrial times due to the cooling effects of remnant ice sheets from the previous glacial period contrary to previous reconstructions of global temperatures,” says lead author Samantha Bova, a postdoctoral researcher associate in the lab of coauthor Yair Rosenthal, professor in the department of marine and coastal sciences and department of earth and planetary sciences at Rutgers University-New Brunswick.
The Straits Times
Oceans warmed steadily over 12,000 years: Study
A crown of thorns starfish is seen at Swains Reef, part of the Great Barrier Reef off the east coast of Australia.PHOTO: AFP
PublishedJan 28, 2021, 2:49 am SGT
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Earth used to be cooler than we thought, which changes our math on global warming Philip Kiefer © Provided by Popular Science Earth was cooler than we thought 6,000 years ago.
The last 12,000 years have been much cooler than previously thought, according to research published Wednesday in the journal
Nature. And in contrast, human-caused warming of the atmosphere is even more anomalous than we’d realized. That’s because the study’s authors have found a new way to estimate historical temperatures which they say filters out seasonal shifts that had made past millennia seem warmer than they really were. © Gerd Altmann/Pixabay
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