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What's the coldest Earth has ever been? | Earth


February 27, 2021
Our planet’s history includes episodes of cold so extreme that glaciers reached sea level in equatorial regions.
Antarctica. Image via NOAA.
For much of its history, our planet has been hotter – sometimes much hotter – than it is today. But our planet has also been colder. Scientists may never know which period in our planet’s 4.54-billion-year history was the absolute coldest, but research has revealed a few contenders. All of these periods have been identified as ancient ice ages.
Some of the coldest conditions struck over 2 billion years ago, after the rise of atmospheric oxygen. More deep freezes occurred between 750 and 600 million years ago. Although scientists debate exactly how extensive the ice coverage was during these times, the evidence indicates that ice reached sea level in equatorial regions. ....

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Arctic ocean expedition advances climate modeling


Credit: Jun Inoue (NIPR)
As the climate warms and Arctic sea ice retreats, research vessels and commercial ships are sailing into the Arctic Ocean more and more, but the accuracy and sensitivity of regional weather and marine forecasts for these hazardous waters still lag well behind those of their lower-latitude counterparts, with significant differences between regional models. Direct measurements of atmospheric conditions, such as cloud cover and solar radiation, can help to evaluate and improve these models.
In a new study published in the
Journal of Geophysical Research: Atmospheres, a research team led by the National Institute of Polar Research in Tachikawa, Japan tackled this problem using data collected by the ice-strengthened Japanese Research Vessel ....

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