ESS200A
Prof. Jin-Yi Yu
Trapping Gases in the Ice
q
Air moves freely
through snow and ice in
the upper 15 m of an ice
sheet.
q
Flow is increasingly
restricted below this
level.
q
Bubbles of old air are
eventually sealed off
completely in ice 50 to
100 m below the
surface.
(from
Earth’s Climate: Past and Future
)