In half decreased the thickness of of Arctic sea ice between 2005-2007 and has not recovered to date, reflecting the long-term effects of climate change, according to a study published in the journal Nature.

According to research led by Hiroshi Sumata from the Norwegian Polar Institute, there was a distinct change in Arctic sea ice characterized by a reduction of more than 50% in thick ice (thicker than four meters) and an increase in thinner, uniform ice. This shift occurred in the period 2005-2007, when the average residence time of sea ice was found to have decreased from 4.3 years to 2.7 years.

As noted by researchers, Arctic sea ice thickness has changed substantially over the past three decades, reflecting environmental changes across the Arctic, and these findings show the long-term effects of climate change. The change in sea ice thickness was a result of increased ocean heat in ice-forming regions.

See the scientific publication here