From the end of 2016, with the direct sunlight moving to the southernmost point, the warmest time of the year in the southern hemisphere will come. In the first half of 2017, in the months when there is sunlight in Antarctica, the ice in Antarctica is changing alarmingly.
Since last year, scientists have been closely monitoring the development of cracks in the Larsen C ice shelf on the Antarctic Peninsula. The huge cracks in Larsen C’s ice shelf will make Larsen C one of the largest icebergs in history. The crack can be observed by satellite and aerial photos throughout the summer
Now, with the arrival of the summer solstice, Antarctica is heading for the coldest and most sunless polar night, but even in the darkness of winter. This huge crack can still be observed. In mid June 2017, NASA satellites again observed the area, which used surface temperature to show the landscape of Larsen C.
Antarctica is the fifth largest continent on earth, where the average thickness of the ice sheet is 1981 meters. It has 90% of the world’s ice and 70% of the world’s fresh water. Under the influence of global warming, Antarctic glaciers, especially the Western glaciers, began to melt on a large scale. If all the Antarctic ice melts, will it submerge the whole earth?
Satellite data show that Antarctic glaciers are melting at a rate of 152 cubic kilometers per year in recent years, especially in the west of Antarctica. These melting glaciers will make the sea level rise by 0.4 mm per year. If all glaciers in the west of Antarctica melt, the sea level will rise to less than 6 m. if all glaciers in the west of Antarctica melt, the sea level will rise by more than 60 M.
Some people may think that this melting rate has little effect on us, but the data show that the temperature in Antarctica reached above 0 ℃ in 37 days in the summer of 2012-2013, while it reached above 0 ℃ in only five days in the summer of 2007-2008. With global warming, this trend will continue to increase. In other words, glaciers will melt faster and faster.
If one day all the Antarctic glaciers melt, the land on the earth will not be completely submerged, but most of the plains will appear on the bottom of the sea, and these places happen to be the most densely populated places, which means that most people will lose their living space. Then the population density surge caused by sea level rise will be a disaster for human beings.
The serious destruction of nature by human beings is the direct cause of global warming, which will lead to the melting rate of Antarctic ice sheet much faster than the regeneration rate. When glaciers melt rapidly, human beings will eventually suffer.
The researchers pointed out that although so far, it is not accurate to estimate when the ice shelf will collapse. However, some model calculations indicate that the collapse of Larsen C has come to the most dangerous moment, and it may collapse in weeks, days or even hours, especially when the speed of fracture propagation is accelerating recently.
As one of the largest ice shelves on the Antarctic Peninsula, Larsen C ice shelf plays an important role in the environment of the Antarctic Peninsula. It is an important buffer zone to slow down the speed of glaciers entering the sea. Although its melting will not have a direct impact on sea level rise, after the disappearance of the ice shelf, the ice on the Antarctic continent may accelerate into the sea at a speed of 3 times or even 9 times Will bring devastating sea level rise!