Part of an ice sheet in which the ice flows more rapidly and not necessarily in the same direction as the surrounding ice. The margins are sometimes clearly marked by a change in direction of the surf
ace slope, but may be indistinct.
A stream of ice with strongly enhanced flow that is part of an ice sheet. It is often separated from surrounding ice by strongly sheared, crevassed margins. See also Outlet glacier.
Sea ice terminology. Describes the part of an inland ice sheet in which the ice flows more rapidly and not necessarily in the same direction as the surrounding ice.
Part of an Ice sheet; Ice flow of higher velocity than surrounding ice masses; Unrestricted by topographic features, which protrude out of the ice mass; The Primary Classification should be extended b
y the class 'Ice stream' because they play an important role in the drainage of the Antarctic ice sheet. Although variable in time and space, they are well defined glaciological features and are of high importance for draining the continental ice sheets.
A linear or curvilinear part of an ice sheet, often a few kilometres to a few tens of kilometres wide and tens to hundreds of kilometres long, in which the ice flows much faster than main body of the
surrounding ice sheet. The margins are sometimes defined clearly by the presence of a shear zone marked by surface crevasses.
(1) a current of ice in an ice sheet or ice cap that flows faster than the surrounding ice (2) sometimes refers to the confluent sections of a branched-valley glacier (3) obsolete synonym of valley gl
aciers.
Part of an island ice sheet in which the ice flows more rapidly and not necessarily in the same direction as the surrounding ice. The margins are sometimes clearly marked by a change in direction of t
he surface slope but may be indistinct.
A part of an ice sheet or ice cap with strongly enhanced flow, often separated from surrounding ice by strongly sheared, crevassed margins. 'Pure' ice streams are bounded by ice on either side and lac
k significant non-glacial topographic control, while 'topographic' ice streams are constrained by the topography. An ice stream of the latter type is similar to an outlet glacier, but outlet glaciers do not necessarily have strongly enhanced flow velocity.
Part of an ice sheet or ice cap in which the ice flows more rapidly, and not necessarily in the same direction as the surrounding ice. Zones of strongly sheared, crevassed ice often define the margins
(cf. shear zone).
The arrangement of water molecules in an ice crystal. Under normal atmospheric temperatures and pressures between 0 and -100C, water molecules arrange themselves into an hexagonal crystalline structur
e called ice-Ih. When viewed along the principal c axis these molecules form spatial hexagonal rings lying above each other, each water molecule surrounded by four others, in a near tetrahedral arrangement.