The crevasse which occurs at the head of a cirque or valley glacier and which separates the moving glacier ice from the rock wall and the ice apron attached to it. When the ice apron is absent the gap
is known as a randkluft.
A crevasse at the head of a glacier that separates flowing ice from stagnant ice, or from a rock headwall. From an ice-dynamical point of view the bergschrund is the headward boundary of the glacier,
while for hydrological and other purposes, including glacier inventory, the stagnant ice above the bergschrund is part of the glacier. Bergschrund is an Anglicized word of German origin.
A large piece of floating ice of land origin, showing less than 5 m above sea-level and 100-300 m2 in area [Note: it might be better to say no more than 20 metres long, rather than give an area]
A large piece of floating glacier ice, generally showing less than 16 ft (- 5 m) above sea level but more than 3 ft (= 1 m) and normally about 120 to 360 sq yds (t 100-300 sq m) in area.
A piece of ice which has broken away from an iceberg, extending 1-5 meters above the sea surface and 100-300 square meters in area. Can also be the remains of a melting iceberg.
A piece of floating ice, generally less than 5 m above sea level and not more than about to m across. It is generally of glacier ice, but may be a massive piece of sea ice or disrupted hummocked ice.
Large chunk of glacier ice (a very small iceberg) floating in the sea; bergy bits are usually less than 5 meters (15 feet) in size and are generally spawned from disintegrating icebergs.
Sea ice terminology that describes a piece of glacier ice, generally showing at 1m to less than 5m above sea level; with a length of 5m to less than 15m. They normally have an area of 100-300 sq. M.
A crackling or sizzling similar to that made by soft drinks or seltzer water but louder. The sound made as air bubbles formed at many atmospheres of pressure are released during the melting of glacier
ice. Also called Ice Sizzle.
A large area of navigable water in which ice of land origin is present or possible at a total concentration less than 1/10. Such zones do not usually have a clearly expressed edge or boundary with ice
-free water. A characterization of ice conditions in such areas can be made both on the basis of data from direct observations, data from previous observations or from climatic data.
Sea ice terminology that describes an area of freely navigable water, in which ice of land origin is present. Other ice types may be present, although the total concentration of all other ice is less
than 1/10.