Melting sea ice is a major cause of warming in the Arctic, says a new study

The findings by the University of Melbourne (UM) team reveal that the rapid melting of sea ice has dramatically increased the levels of warming in the region in the last two decades.

Lead author James Screen of the School of Earth Sciences (UM) says the increased Arctic warming was due to a positive feedback between sea ice melting and atmospheric warming.

“The sea ice acts like a shiny lid on the Arctic Ocean. When it is heated, it reflects most of the incoming sunlight back into space. When the sea ice melts, more heat is absorbed by the water. The warmer water then heats the atmosphere above it,” says Screen.

“What we found is this feedback system has warmed the atmosphere at a faster rate than it would otherwise,” he says.

Using the latest observational data from the European Centre for Medium-Range Weather Forecasting, Screen was able to uncover a distinctive pattern of warming, highly consistent with the loss of sea ice.

“In the study, we investigated at what level in the atmosphere the warming was occurring. What stood out was how highly concentrated the warming was in the lower atmosphere than anywhere else. I was then able to make the link between the warming pattern and the melting of the sea ice.”

Screen says prior to this latest data set being available; there was a lot of contrasting information and inconclusive data. “This current data has provided a fuller picture of what is happening in the region.”

Over the past 20 years the Arctic has experienced the fastest warming of any region on the planet. Researchers around the globe have been trying to find out why.

Researchers say warming has been partly caused by increasing human greenhouse gas emissions. At the same time, the Arctic sea ice has been declining dramatically, says an UM release.

In the summer of 2007, the Arctic had the lowest sea ice cover on record. Since then levels have recovered a little but the long-term trend is still one of decreasing ice.

These findings were published in Nature.