A type of hoarfrost that is formed on the windward side of terrestrial objects and on aircraft flying from cold to warm air layers. Ice feathers are made up of single, columnar ice crystals, some of w
hich grow out from others at large angles and thus build up a delicate spatial array of tiny crystals. (Also called frost feathers.)
An area of floating ice of any size, which is greater than 10 km across. The characteristics, position and sizes of fields are described as separate zones.
A continuous accumulation of snow and glacier ice that completely fills a mountain basin or covers a low-relief mountain plateau to a substantial depth. When the thickness become great enough, tongues
of ice overflow the basins or plateaus as Valley Glaciers.
Approximately horizontal, ice covered area; Ice covering does not overwhelm surrounding topography; Occur in topographical depressions or plateaus; No dome like shape (in contrast to Ice cap); Smaller
than 50.000km^2 (approx. 220 x 220 km) ; Ice masses of sheet or blanket type of a thickness not sufficient to obscure the sub-surface topography; In some cases no need to classify in "Frontal characteristic" (the frontal characteristic is described by the outreaching glaciers); Might also be used to classify low lying areas where the ice divides and flow directions are not clearly detectable "transectional glaciers")
A large ice body that covers mountainous terrain but is not thick enough to obscure all of the subsurface topography, its flow therefore not being predominantly radial as is that of an ice cap.
A cohesive sheet of ice floating in the water; the sea ice cover is made up of conglomerates of floes; ice floes are not unique to sea ice, as they also occur in rivers and lakes.
1.Delicate tufts of hoarfrost that occasionally form in great abundance on an ice or snow surface (surface hoar); it also forms as a type of crevasse hoar or window frost. 2.Formations of ice crystals
on the surface of a quiet, slowly freezing body of water.
A type of fog, composed of suspended particles of ice, partly ice crystals 20 to 100 m in diameter, but chiefly, especially when dense, droxtals 12?20 m in diameter. It occurs at very low temperatures
, and usually in clear, calm weather in high latitudes. The sun is usually visible and may cause halo phenomena. Ice fog is rare at temperatures warmer than -30?C, and increases in frequency with decreasing temperature until it is almost always present at air temperatures of -45?C in the vicinity of a source of water vapor. Such sources are the open water of fast-flowing streams or of the sea, herds of animals, volcanoes, and especially products of combustion for heating or propulsion. At temperatures warmer than -30?C, these sources can cause steam fog of liquid water droplets, which may turn into ice fog when cooled (see frost smoke). See ice-crystal haze, arctic mist.
(Also called ice-crystal fog, frozen fog, frost fog, frost flakes, air hoar, rime fog, pogonip.) A type of fog, composed of suspended particles of ice; partly ice crystals 20 to 100 micron in diameter
, but chiefly (especially when dense) ice particles about 12
A suspension of numerous minute ice crystals in the air, reducing visibility at the earth's surface. The crystals often glitter in the sunshine. Ice fog produces optical phenomena such as luminous pil
lars and small haloes.
A fog that is composed of small suspended ice crystals. Common in Arctic locations when temperatures are below -30 Celsius and a abundant supply of water vapor exists.