The sea ice has an important influence on the vertical distribution
of Marine hydrological elements, the movement of seawater, the heat
of the ocean and the formation of the bottom water of the ocean.
It also threats shipping and construction of ports.
In the Bohai and the north of the Yellow Sea, there are different
degrees of freezing in winter each year and the line of ice is parallel
to the shoreline. The permanent ice age is about 3~4 months and
the ice age is 0.2 ~ 2 km wide. The northern part of the ice thickness
is 20 ~ 40cm and the south is 10~ 30cm, which has little influence on
the development of navigation and Marine resources.
On April 14, 1912, 45, 000 tons of the Titanic, a large luxury
cruise ship, hit an iceberg and was destroyed, killing more than
1,500 people. It was one of the greatest sea ice disasters of
the 20th century.
From Febrary to March of 1969, Bohai sea in China occurred serious
icebound, everywhere was covered by ice except areas near the
straits' tidal sea. Besides, almost all ports froze, waterway blocked,
offshore oil drilling platforms in ice was pulled down, sea ship
was damaged by ice, ice ton cargo ship was hijacked and drifted
for 4 days and almost all maritime activities stopped.
During Great ice age in Bohai, 41 meters in diameter, 0.85 meters long,
and 28 meters of a hollow cylinder pile that is made of manganese
steel plate that is by 15 root 2.2 cm thick and that formed “Haierjing”
oil platform was destroyed by the flow ice. Another tiepieces of 500 tonnes
of “Haiyijing” platform support are all cut by the sea ice
so as you can see, visible damage of sea ice to the ship
and ocean engineering construction disasters is really serious.
Antarctica is the world's largest natural icebox, with more than
90 percent of the world's ice and snow here. Icebergs near Antarctica
are broken into the sea by glaciers around the continent.
Icebergs that appear in the waters of the southern hemisphere
are much larger than those in the northern hemisphere, often with hundreds
of kilometres width and hundreds of metres height, like an Iceland.