What is the extent of ice in Antarctica?
Antarctic sea ice extends to about 7 million square miles in winter, versus 6 million square miles in the Arctic; the Antarctic summer minimum is about 1 million square miles versus 2.5 million square miles for the Arctic.
Is Antarctic sea ice increasing?
From the start of satellite observations in 1979 to 2014, total Antarctic sea ice increased by about 1 percent per decade. Whether the increase was a sign of meaningful change is uncertain because ice extents vary considerably from year to year around Antarctica.
What was the Arctic sea ice area in March 2017?
5.57 million square miles
Arctic sea ice extent for March 2017 averaged 14.43 million square kilometers (5.57 million square miles), the lowest March extent in the 38-year satellite record.
What was the minimum extent of Arctic sea ice in 2012?
3.41 million square kilometers
On September 16, 2012 sea ice extent dropped to 3.41 million square kilometers (1.32 million square miles). This appears to have been the lowest extent of the year.
What is sea ice extent?
Sea ice extent is the area of ice that covers the Arctic Ocean at a given time. Sea ice plays an important role in reflecting sunlight back into space, regulating ocean and air temperature, circulating ocean water, and maintaining animal habitats.
How much of Antarctica is ice?
about 97.6 percent
The essence of Antarctica is glacial ice cover. The ice, which has accumulated over millions of years, is up to 3 miles deep and covers about 5.3 million square miles, or about 97.6 percent of the continent.
Is Antarctic ice increasing or decreasing?
The Arctic regularly reaches ever smaller extents of end-of-summer minimum extents of sea ice. This changing sea ice extent is cited by the IPCC as an indicator of a warming world. However, sea ice extent is growing in Antarctica [1]. In fact, it’s recently broken a record for maximum extent.
Why is Antarctica ice increasing?
The sea-ice cover in Antarctica may be increasing because the air in neighbouring regions is warming, which means it holds more moisture, some of which falls as rain and snow around Antarctica.
What year did Arctic sea ice reach its minimum extent since measurements began in 1979?
The animated time series below shows the annual Arctic sea ice minimum since 1979, based on satellite observations. The 2012 sea ice extent is the lowest in the satellite record.
What is the general trend in sea ice extent for September 1979 2015?
The linear rate of sea ice decline for September extent from 1979 to 2019 is 82,400 square kilometers (31,800 square miles) per year, or 12.9 percent per decade relative to the 1981 to 2010 average.
Is the ice in Antarctica salty?
Therefore, when glaciers and icebergs form, they are almost pure water, and the salt gets left behind in the unfrozen water. The more ice that forms, the more salt that gets left behind, which makes the ocean water in Antarctica much saltier than in most other oceans around the world.
How old is Antarctic ice?
The oldest penetrated Antarctic ice is about 800,000 years old.