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Pressure ridge in
A pressure ridge is formed where an ice sheet is
broken and one piece rides over the other. The
actual "pressure" is often provided by winds, storms or
ocean currents that can be many miles distant acting on
the edge of the ice sheet. So at the position of the pressure
ridge itself, it can be eerily calm while huge forces are
exerted through the ice itself. Such pressures are what
threatened and destroyed some of the ships of the early
polar explorers such as Shackleton's Endurance.
Picture courtesy of Mike Usher
- Mike went on a Ross Sea expedition on board the Kapitan Khlebnikov
You can purchase a selection of Mike's pictures