Antarctica is increasing its height in recent years, what does it mean?

By Ronald Woan

It is an extremely cold place in winter, under the Antarctica covered with snow and ice in the summer, the ground of the earth similar to other continents is hidden. It has become evident that this land gradually increases its height gradually in recent years.

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According to research in recent years, it is clear that the Antarctic earth is gradually increasing at a pace of 41 mm per year. Although it can be said that it is a slight movement of only 41 mm, the important thing is that the speed is getting faster than in the past.

The reason Antarctica is getting higher is due to the gradual decline in the amount of ice on the ground. 98% of Antarctica is covered with ice, and the ice block " Antarctic Ice Bed " is the largest piece of ice on Earth. About 60% of the fresh water that is on the earth is present in Antarctic ice, ice thickness of about 2450 m on average, be about 4000 meters up there . If all the ice on the Antarctica is put on, the sea level of the earth is considered to rise by about 60 meters on average. To so much a huge amount of ice exists on the Antarctic continent.

A huge amount of ice standing on the Antarctic continent means that tremendous heavy objects are settled on the continent. Under the continent the mantle rock melted in the muddy is convecting and it is in a fluid state. Antarctica is pushed down by the tremendous weight of the Antarctic ice sheet here. At this time, it can be said that Antarctica is in a state of "Pukapuka" floating in balance at the balance between the weight by himself and the ice sheet and the buoyancy against the mantle. This phenomenon is explained in the theory of isostasis .

Thus, since Antarctica is floating above the mantle based on the weight combined with the weight of the ice on it, the balance changes as the amount of ice decreases and gradually changes to mantle It emerges from. The pace is 41 mm a year in recent years, and the pace is getting faster than in the past.

It is said that both good and bad points exist for Antarctica to uplift. First of all, the good point is that the continent rises and the ice remaining on the continent becomes more stable than before. It seems that this means that the amount of ice that flows out to the ocean will decrease because the positional relationship with the sea surface changes.

One of the bad points is that large error may occur in the survey data on the Antarctic ice sheet using artificial satellites. The volume of the Antarctic ice is determined based on the area and the thickness in the survey using the satellite, but if the Antarctic Continent itself can not accurately grasp the correct amount, it is correct It is not possible to calculate the numerical value. In recent years, the change in the uplift pace of the continent is larger than before, so the difficulty of accurately grasping the amount of ice left in Antarctica is increasing.

It is thought that there is a close relationship with the fact that the average temperature of the earth rises to the fact that the speed at which the Antarctic ice decreases is accelerating. Since 1992, from the Antarctic, truly 3 trillion tons of ice has been lost, and as a result it is believed that the Earth's sea level rose by about 8 mm. Also, some scientists believe that the West Antarctic ice sheet will collapse completely in the next 100 years, causing a sea level rise of about 3 meters.

There is also a part that has not been clarified yet in this field, and the mechanism to explain the decline of the ice sheet and uplift of Antarctica from the movement of the mantle is at a stage where the details will be unveiled from now on. Therefore, it is also pointed out that possibly no big change will occur as it is currently thought.

Nevertheless, it can be said that there is no doubt that the ice sheet covering Antarctica suddenly changes on the hundreds of years time axis. It seems inevitable that it will inevitably bring great attention to how the environment of the Antarctic changes, and how the environment of the whole earth will be affected in the future.