The minimum extent of sea covered by Arctic ice shrank to 4.41 million square kilometers on September 11, which is 1.81 million square kilometers less than the 1981-2010 average.
The minimum Arctic sea ice measured by NASA satellites this summer is the fourth lowest recorded since the start of observations from space. This year, the minimum extent of sea covered by Arctic ice shrank to 4.41 million square kilometers on September 11, which is 1.81 million square kilometers less than the 1981-2010 average.
The sea-ice cover in the Arctic helps regulate the temperature of the planet by reflecting solar energy back into space. The sea ice grows and shrinks with the seasons cycle. Its minimum length of summer, which occurs at the end of the melt season, has been declining since the late 1970s in response to warmer temperatures. In some recent years, the minimum extent of sea ice has been at least partly aggravated by meteorological factors, but that was not the case this year. “This year is the fourth lowest, and we have not seen any major weather event or pattern of persistent climate in the Arctic this summer that will help drive a lower extension as often happens,” said Walt Meier, a scientist sea ice the NASA Goddard. “It was a little warmer in some areas than last year, but it was colder in other places, too.”
A video with the evolution of ice is available in https://www.youtube.com/watch?v=OpwM6PfcIbg In contrast, the lowest year history, 2012, saw a powerful cyclone August that fractured the ice accelerating its decline. The shrinking sea ice has accelerated since 1996. The 10 lowest in the satellite record lows degrees have occurred in the last 11 years. “The ice becomes less and less resistant, and does not need much heat to melt it as before,” Meier said. “The sea ice, which used to be a solid layer of ice, is now fragmented into smaller icebergs that are more exposed to ocean waters warmed.
In the past, the Arctic sea ice was like a fortress. The ocean could only attack from the sides. Now it is vulnerable from below the ice pack melts from within. ” Some analyzes have suggested that older and thicker ice that survives the summer melt season, seemed to have partially recovered after record minimum extent of 2012. But according to Joey Comiso, sea ice scientist at Goddard The recovery was cut last winter and is likely to reverse after this melt season. “The thicker ice will probably continue to decline,” Comiso said. “There may be some recoveries for some years, especially when the winter is unusually cold, but is expected to fall again because the surface temperature in the region continues to increase,” says NASA. This year the sea ice cover in the Arctic Melting experienced relatively low rates in June is the month when the Arctic receives more solar energy. However, the rate of ice loss increased during July, when the sun is still strong. August was a normal month of transition.