Sea spray aerosols similar to those in California are popping up during the Arctic winter, researchers say.

The loss of sea ice in the Arctic has opened pathways for a virus deadly to seals, otters, and other marine mammals, researchers say.

"...in the near future, we should keep an eye on the tropics if we want to better predict conditions in the Arctic."

Century-old ship logs offer a better picture of the history of Arctic sea ice. Get a close look at the records here.

A vast expanse of open water in the sea ice above Greenland in February mystified scientists, but a new analysis shows global warming wasn't the cause.