Sea Ice

Sea ice is frozen seawater. Because ice is less dense than its melt, sea ice floats. Sea ice covers about 7% of the Earth’s surface, or about 12% of the world’s oceans. In the North, it is found in the Arctic Ocean, in areas just below it and in other cold oceans, seas and gulfs; in the Antarctic, it occurs in various areas around Antarctica (the continent). Due to the combined action of winds, currents and air temperature fluctuations, sea ice expanses are very dynamic. In the fall and winter, the ice grows progressively thicker, defining floes of various sizes that collide against each other. This activity also goes on in the spring and summer, but during that time part of the ice melts. This ice may be contrasted with icebergs, which are chunks of ice shelves or glaciers that calve into the ocean. Unlike sea ice, which is saline, icebergs are made from fresh water. They may be enclosed within sea ice expanses and drift along with it.

Read more about Sea IceTypes of Sea Ice, Formation of Sea Ice, Yearly Freeze and Melt Cycle, Monitoring and Observations, Modelling, Ecology, Relationship To Global Warming and Climate Change

Other articles related to "sea ice, ice, seas, sea":

Lead (sea Ice)
... /ˈliːdz/ are large fractures within an expanse of sea ice, defining a linear area of open water that can be used for navigation purposes ... Leads, along with polynyas (another sea ice feature involving open water), allow the direct interaction between the atmosphere and the ocean, and are ... are partly or entirely covered by a thin layer of new ice ...
Catlin Group - Catlin Arctic Survey
... Catlin Arctic Survey 2009 measured the thickness and density of the permanent sea ice floating in the Arctic Ocean ... scientists, who concluded that the Arctic sea ice could disappear during summers within 20 years ... are gathering at a purpose-built 'Ice Base' at the edge of the Arctic Ocean to study whether the increase in global carbon emissions is causing increased carbon dioxide absorption by the seas ...
Climate Of The Arctic - Global Warming
... First, is the ice-albedo feedback, whereby an initial warming causes snow and ice to melt, exposing darker surfaces that absorb more sunlight, leading to more warming ... Fourth, a reduction in sea-ice extent will lead to more energy being transferred from the warm ocean to the atmosphere, enhancing the warming ... Decreases in sea-ice extent and thickness are expected to continue over the next century, with some models predicting the Arctic Ocean will be free of sea ice in late summer ...
Sea Ice - Relationship To Global Warming and Climate Change
... Sea ice provides an ecosystem for various polar species, particularly the polar bear, whose environment is being threatened as global warming causes the ice to melt a bit more as the ... Furthermore, the sea ice itself functions to help keep polar climates cool, since the ice exists in expansive enough amounts to maintain a cold environment ... At this, sea ice’s relationship with global warming is cyclical the ice helps to maintain cool climates, but as the global temperature increases, the ice melts, and is less effective in keeping ...
Climate Of The Arctic - Temperature - Greenland
... is divided into two very separate regions the coastal region, much of which is ice free, and the inland ice sheet ... The Greenland Ice Sheet covers about 80% of Greenland, extending to the coast in places, and has an average elevation of 6,900 feet (2,100 m) and a maximum elevation of 10,500 feet (3,200 m) ... Much of the ice sheet remains below freezing all year, and it has the coldest climate of any part of the Arctic ...

Famous quotes containing the words ice and/or sea:

    Suddenly I saw the cold and rook-delighting heaven
    That seemed as though ice burned and was but the more ice,
    William Butler Yeats (1865–1939)

    Rain patters on a sea that tilts and sighs.
    Fast-running floors, collapsing into hollows,
    Tower suddenly, spray-haired.
    Philip Larkin (1922–1986)