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Drift ice is ice that floats on the surface of the water in cold regions, as opposed to fast ice, which is attached ("fastened") to a shore. Usually drift ice is carried along by winds and sea currents, hence its name, "drift ice".

When the drift ice is driven together into a large single mass, it is called pack ice. Wind and currents can pile up ice to form ridges three to four metres high, creating obstacles difficult for powerful icebreakers to penetrate. Typically areas of pack ice are identified by high percentage of surface coverage by ice: e.g., 80-100%.

Ice floes / Pack ice
An ice floe is a large piece of drift ice that might range from tens of metres (yards) to several kilometres in diameter. Wider chunks of ice are called ice fields.

The two major ice packs are the Arctic ice pack and the Antarctic ice pack.

In many areas such as the Balticmarker, drift ice is traditionally a seasonal event, appearing in winter and vanishing in warmer seasons.

Seasonal ice drift in the Sea of Okhotskmarker by the northern coast of Hokkaidōmarker, Japanmarker has become a tourist attraction of this area with harsh climate. Sea of Okhotsk is the southernmost area in the Northern hemispheremarker where drift ice may be observed.

Drift ice primarily affects:

Polar ice packs

The most important areas of pack ice are the Polar ice packs formed from seawater in the Earth's polar regions: the Arctic ice pack of the Arctic Oceanmarker and the Antarctic ice pack of the Southern Oceanmarker. Polar packs significantly change their size during seasonal changes of the year. Because of vast amounts of water added to or removed from the oceans and atmosphere, the behavior of polar ice packs has a significant impact on global changes in climate.

See also


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