See our Citation Policies for more details about how to structure your data citation. There is a more recent version of these data. The Circum-Arctic permafrost and ground ice map is available via ftp ...

Drilling is ongoing on a second core EDC99 (started in 1999, reached a depth of 3200 m during the 2002/2003 field season. The ice at this depth is estimated to be about 700,000 years old.) Blue ...