How deep is the frost line in Antarctica?

Answer 1

The Southern Ocean which surrounds the Antarctic continent -- according to Wikipedia:

"The Southern Ocean's greatest depth of 7,236 m (23,740 ft) occurs at the southern end of the South Sandwich Trench, at 60°00'S, 024°W. "

Answer 2

In Antarctica -- and in the Arctic -- the term is thaw line, because in Antarctica the landscape is covered with an ice sheet -- 98% of it..

From Earth Science beta:

"According to "Permafrost, active-layer dynamics and periglacial environments of continental Antarctica" South African Journal of Science 98. pages 82-90:

• Only 25% of Antarctica has permafrost, as the material beneath thick ice sheets is not permafrost.
• The deepest permafrost occurs where there is no ice sheet.
• The deepest permafrost in the Antarctic is about 1000m (3,280.84')."

Note as well, that the sub-glacial lakes, such as Lake Vostok, are apparently liquid because of their proximity to the Earth's core. The surface depth of Lake Vostok is -1,640' and its depth has been measured at 3,281'.

Answer 3

The Antarctic ice sheet is the largest in the world with about 13.72 million sq km of permanent ice representing about 90% of the worlds ice and is over 4 km thick in places.

Answer 4

1.33 miles deep.