Proper noun
Arctic Sea
The Arctic Ocean.
The prediction that glaciers will be gone from Glacier National Park has been moved up by 10 years to 2020, the same year it's predicted the Arctic Sea will be ice-free in the summer. Bill Kurtis
The North Pole will be ice-free during summer in years to come, and that itself will put the Arctic Sea basin on a very high risk of... environmental disasters that might be there. Aleqa Hammond
I'm not sure the "remarkable Arctic warmth" is real, especially since the disappearance of arctic sea ice during that time has been linked not to warmer temperatures, but to wind patterns by other researchers at NASA. Anthony Watts