Arctic sea ice appeared to have hit its annual maximum extent on February 25 after growing through the fall and winter – the 10th-lowest in the satellite record maintained by the National Snow and Ice Data Center, one of NASA’s Distributed Active Archive Centres. The Arctic sea ice extent peaked at 14.88 million square kilometres on February 25 – earlier than usual – and was roughly 770,000 square kilometres below the 1981-2010 average maximum. This maximum ties with 2015 as the third earliest on record. NASA’s analysis also shows the Arctic is warming about three times faster than other regions.
Sea ice waxes and wanes with the seasons every year. In the Arctic, it reaches its maximum extent around March after growing through the colder months, and shrinks to its minimum extent in September after melting through the warmer months. In the Southern Hemisphere, Antarctic sea ice follows an opposite cycle, NASA said.
To estimate sea ice extent, satellite sensors gather sea ice data that are processed into daily images, each image grid cell spanning an area of roughly 25 kilometres by 25 kilometres. Scientists then use these images to estimate the extent of the ocean where sea ice covers at least 15 per cent of the water.
Since satellites began reliably tracking sea ice in 1979, maximum extents in the Arctic have declined at a pace of about 13 per cent per decade, with minimum extents declining at about 2.7 per cent per decade. These trends are linked to warming caused by human activities such as emitting carbon dioxide, which traps heat in the atmosphere and causes temperatures to rise.
NASA’s analysis follows reports earlier this week that both the Earth’s poles – Arctic and Antarctic – are undergoing ‘freakish’ heat waves – with parts of the Arctic more than 30 degrees Celsius warmer than average.
The space agency confirmed that Antarctic sea ice also dropped to a record-low minimum extent in February. But unlike in the Arctic, this sea ice has shown irregular ups and downs mainly because of the geographical features that surround it. Winds and ocean currents specifically linked to the Southern Ocean and Antarctica have a strong influence on sea ice extent.
Sea ice in the Arctic is surrounded by land, whereas sea ice in the Antarctic is surrounded only by ocean and can thus spread out more freely. Overall, the Antarctic sea ice record shows a slightly upward – but nearly flat – trend or increase.
Gains in Antarctic sea ice are not large enough to offset the losses of the Arctic. The ice in both regions helps regulate global temperatures. Even if Antarctica gains balanced sea ice levels globally, Arctic sea ice losses could still contribute to further regional and global warming, the analysis showed.
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