Where can I see sea ice and what is it?

Aquaria. Seaside.

In the film and television.

Shanghai Huangpu bar, not sure!

Categories: Social Culture.

Analysis: Sea ice is a marine hazard endemic to polar and high-latitude seas. In the Northern Hemisphere, the extent of sea ice has significant seasonal variations, with a maximum in March and April, after which it begins to shrink and reaches a minimum in August and September.

The Arctic Ocean is covered with ice almost all year round, and about 84% of the ocean surface is covered in winter (February). The summer (September) coverage was also 54 per cent. Because the Arctic Ocean is surrounded by continents, drift ice is blocked by land and tends to be crowded together, forming ice mounds and ridges.

In the Arctic seas, ice mounds account for about 40%.

In the Arctic Ocean, the Bering Sea, the Sea of Okhotsk, and the Sea of Japan all have sea ice formation in winter; The Atlantic Ocean and the Arctic Ocean are unobstructed, and sea ice is more abundant. Sea ice is found in southern Greenland, as well as in the Davis Strait and southeastern Newfoundland, with Greenland and Newfoundland being the most active areas of icebergs in the Northern Hemisphere.

Antarctica is the world's largest natural ice storehouse, with more than 90% of the world's total ice and snow stored here. The sea ice in the Southern Ocean is different from the ice in the Greenland ice sheet and the ice sheet of the Rubber Continent in the South Highland. In the winter half of the year (4 November), large floes of one or two meters thick expand irregularly northward, covering the Southern Ocean south of latitude 40°S.1 3

Icebergs near Antarctica are formed by glaciers around the Antarctic continent breaking into the sea. The icebergs that appear in the waters of the southern hemisphere are much larger than those that appear in the northern half of the spike, often hundreds of kilometers long and wide, and hundreds of meters high, like an Iceland.

The compressive strength of sea ice depends mainly on the salinity, temperature, and age of the sea ice. Generally, the compressive strength of new ice is greater than that of old ice, and the compressive strength of sea ice with low salinity is greater than that of sea ice with high salinity, so sea ice is not as dense and hard as freshwater ice, and in general, the strength of sea ice is about 75 of that of freshwater ice, and people can walk safely on 5 cm thick river ice, while 7 cm thick ice is required to walk safely on sea ice. Of course, the lower the temperature of the ice, the greater the compressive strength.

In 1969, during the extremely large ice in the Bohai Sea, in order to rescue the ships, the Air Force dropped 30 kilograms of explosives on the 60-centimeter-thick layer of ice, but the ice was not broken.

In the Bering Sea, the Sea of Okhotsk, and the Sea of Japan in the North Pacific, sea ice forms in winter; The Atlantic Ocean and the Arctic Ocean are open, and sea ice is more abundant, and there are traces of sea ice in southern Greenland, as well as in the Davis Strait and southeastern Newfoundland, with Greenland and Newfoundland being the most active areas of icebergs in the Northern Hemisphere. However, most of these icebergs are huge ice blocks that slide into the ocean after the continental glacier or shelf ice breaks, and the shape is mostly like a multi-word tower, with impurities such as sediment in the ice, and the density is large, among which the height of the exposed sea surface is more than 5 meters. The height of icebergs is generally tens of meters, and the length ranges from hundreds of meters to tens of kilometers.

Antarctica is the world's largest natural ice storehouse, home to more than 90% of the world's total snow and ice. The sea ice in the Southern Ocean is different from the ice on the Greenland ice sheet and the ice sheet of the Antarctic continent. In the winter half of the year (4 November), large floes of one or two meters thick expand irregularly to the north, covering the Southern Ocean south of 40°S.1 3, most of these ices are winter ice, and by summer almost more than 80% of them have melted.

The icebergs near Antarctica are formed by the glaciers around the Antarctic continent breaking into the sea. The icebergs that appear in the waters of the Southern Hemisphere are much larger than those found in the Northern Hemisphere, often hundreds of kilometers long and wide, and hundreds of meters high, like an Iceland. It has a flatter shape, a purer texture, and less density.

After the iceberg drifts away from the source, it will gradually melt when it encounters warmer water. The average ice age of icebergs in the southern hemisphere is 4 years, and the icebergs drift northward as far north as southern Africa, about 3,000 kilometers away from their source. According to the Antarctic Research Commission, the number of icebergs found in the Antarctic observation area in 1973 was 10,000.

This observation area covers only 1,15 of the Southern Ocean, from which it is estimated that there are about 300,000 icebergs in the Southern Ocean.

Natural ice is a methane solid, which is generally found in the deep sea.

The Arctic Ocean has natural ice as an energy source.

Sea ice refers to saltwater ice formed by freezing seawater, but also includes continental glaciers (icebergs and Iceland), river ice and lake ice that enter the ocean. Saltwater ice is a mixture of solid ice and tooth water (including some salt crystals), which has a salinity of 2 to 10% lower than seawater, and its physical properties are different from freshwater ice.

Sea ice in the narrow sense refers to saltwater ice that freezes in the ocean. Sea ice is initially formed in the form of needles or sheets, then accumulates and condenses, and is stacked on top of each other to form overlapping ice and stacked ice under the action of external forces such as wind, currents, waves and tides. Generally floating on the surface of the sea, the height of the regular shape of the sea ice outcropping is 1 7 1 10 of the total thickness, and the height of the spire ice outcropping is 1 4 1 3 of the total thickness.

The reflectivity is. 70, the compressive strength is about 3 4 of freshwater ice.

Adding river ice and icebergs to the narrow definition of sea ice is sea ice in the broad sense. Sea ice in a broad sense refers to ice at sea, including freshwater ice (glacial and river ice) from continents and saltwater ice formed by the direct freezing of seawater.

Some sea ice will be associated with the sea.

The shore or seabed freezes together, and this sea ice is called "fixed ice"; Those that can drift with the wind and currents are called "ice floes". Worth.

It is worth mentioning that when sea ice freezes and melts, it can cause changes in sea conditions, and drift ice can affect ship navigation and endanger offshore construction.

Buildings. The properties of sea ice mainly refer to its compressive strength, which must not be ignored in the study of sea ice. Sea ice.

The compressive strength depends mainly on the salinity, temperature, and age of the sea ice. Usually new ice has greater compressive strength than old ice and has lower salinity.

Sea ice has greater compressive strength than sea ice with high salinity.

As a result, freshwater ice is denser and harder than sea ice, which is about as strong as freshwater.

75% of the ice, if a person can safely walk on 5 cm thick river ice, then in sea ice it needs 7 cm thick to do.

Make sure that people walk safely on it. Of course, the lower the temperature of the ice, the greater the compressive strength.

In 1969, the Bohai Sea was extremely frozen, the thickness of the sea ice could reach 60 centimeters, and it was extremely hard, so in order to save the ship, 30 kilograms of explosives were used to break the ice, and the ice was unexpected.

It's just blown up.

Sea ice is a great danger to seafaring vessels, and the following methods are generally used to eliminate the danger: dumping coal ash, profit.

melt sea ice by absorbing the heat of the sun; Use explosives to blow up a route; Fuel is used to heat the melted sea ice.