Sea Ice is Thinning Faster than Previously Thought


Via Flickr

Josie Taylor | June 7, 2021

Sea ice thickness is found by measuring the height of the ice above the water, but this measurement can be thrown off by snow. In order to adjust for this, scientists have been using a map of snow depth in the Arctic that was made decades ago and does not consider climate change. 

In research published by The Cryosphere, scientists and researchers used a new computer model designed to estimate snow depth as it varies year to year, instead of the old map. They found that sea ice in key coastal regions was thinning at a rate that was 70 to 100 percent faster than had previously been thought.

Robbie Mallett, the PhD student in Earth Science at the University of London who led the study said, “The thickness of sea ice is a sensitive indicator of the health of the Arctic. It is important as thicker ice acts as an insulating blanket, stopping the ocean from warming up the atmosphere in winter, and protecting the ocean from the sunshine in summer. Thinner ice is also less likely to survive during the Arctic summer melt.”

Mallett also mentioned that one of the reasons why it is thinning quicker than they had thought is because snow is forming later and later in the year. 

Co-Author and Professor, Julienne Stroeve, said that there are still uncertainties in their model, but this is a closer look at accuracy than what was previously had. 

Another group of researchers at the University of Colorado looked at ice thinning as well with their new research model. They found that ice was thinning 70 to 110 percent faster, similar to the research group mentioned earlier. 

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