A collective term used to describe all types of glacier sedimentary deposits, regardless of the size or amount of sorting. The term includes all sediment that is transported by a glacier, whether it i
s deposited directly by a glacier or indirectly by running water that originates from a glacier.
A boundary between ice massifs or zones drifting in different directions or with a different speed. Drift divide indications include increased fracturing of the ice cover, flaws, ridging belts, leads
and diverging zones. One frequently observes ice floe rotation at the drift divide.
Any sea ice that has drifted from its place of origin. The term is used in a wide sense to include any areas of sea ice, other than fast ice, no matter what form it takes or how disposed.
Sea ice terminology. This term is used in a wide sense to include any area of ice, other than fast ice, no matter what form it takes or how it gets there. When concentrations are high (7/10 or more) t
he term pack ice is normally used. When concentrations are 6/10 or less the term drift ice is normally used.
An ensemble of snow particles raised by the wind to small heights above the ground. The visibility is not sensibly diminished at eye level (cf. Blowing snow).
Snow entrained and transported within 2 m of the surface by the wind. The height of 2 m is a convenient separator between drifting snow, which does not reduce sensibly the horizontal visibility at eye
level, and blowing snow. See windborne snow.
Snow raised from the surface of the earth by the wind to a height of less than 1.5 to 2.0 meters (5 to 6.6 feet) above the surface; it dose not restrict horizontal visibility at 2 meters (6.6 feet) or
more above the surface.
Snow raised from the surface of the earth by the wind to a height of less than 6 ft above the surface. In aviation weather observations, drifting snow is not regarded as an obstruction to vision becau
se it does not restrict horizontal visibility at 6 ft or more above the surface. When snow is raised 6 ft or more above the surface, it is classified as blowing snow.
Drifting snow is an uneven distribution of snowfall/snow depth caused by strong surface winds. Drifting snow may occur during or after a snowfall. Drifting snow is usually associated with blowing snow
.
The third invariant for charged particlemotion in a dipolar magnetic field is associated with drift of its guidingcenter in the equatorial plane. The conserved quantity,J2, is equal to q&Ph
i; where q is the particlecharge and Φ is the magnetic flux enclosed within the particle driftpath.