Science, Space and Technology News 2024
Arctic sea ice coverage in 2024 decreased to 6 million square miles, continuing a 46-year trend of shrinkage and thinning.
The map above shows the ice extent on March 14, the day of the annual maximum. To determine extent, scientists project satellite observations of sea ice onto a grid and then add up the total area of each cell that is at least 15 percent ice-covered. The yellow outline shows the median sea ice extent for February from 1981 to 2010. A median is the middle value; that is, half of the extents were larger than the yellow line and half were smaller.
“The sea ice and the snow on top of it are very reflective,” said ice scientist Linette Boisvert of NASA’s Goddard Space Flight Center. “In the summer, if we have more sea ice, it reflects the Sun’s radiation and helps keep the planet cooler.”
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