A new study, said meteorologist successfully cracked the Antarctic sea ice area of the big global warming still on increasing trend in the context of the mystery, but this trend may soon be reversed, the Antarctic sea ice melting faster will soon speed up.
Increased due to the natural process of sea ice
According to the implementation of the study led the U.S. Georgia Institute of Technology scientist Ji-Ping Liu (transliteration) introduction of satellite data show that over the past 30 years, Arctic sea ice area is shrinking, while the Antarctic sea ice area has mysteriously increased. He said: “We have seen this conflict, but do not know why – the latest research reveal this mystery.” Based on the latest analysis from 1950 to 2009 the climate models and sea surface temperature and precipitation.
The results show that, in the 20th century, ocean temperatures over the Antarctic upper atmosphere promote increased precipitation, precipitation in the way of snow fell on the ground. Increase the amount of snow makes the uppermost layers of the marine lower salinity, density decreased correspondingly. These levels become more stable, to avoid changes in density produces a warm deep ocean currents increase, and then melting sea ice.
Ji-Ping Liu pointed out that satellite data show Antarctic sea ice in the 20th century may be mainly due to increase in the natural process, but in the 21st century, it was not the case, scientists estimated that human-induced global warming dominate the Antarctic climate, sea-induced rapid melting of ice. New study, with the increase of greenhouse gases continue to heat up the ocean around Antarctica, the Antarctic precipitation will be more the form of rain, rapid melting of snow and ice.
The results, published in the latest issue of “National Academy of Sciences” magazine. The study says the more the ice melted, the sun is absorbed into the ocean the more the number, not by sea reflection into the atmosphere. A result, a further rise in ocean temperatures, melting more sea ice at the same time. According to scientists predict, from the natural changes to the warming due to greenhouse gases will soon begin the transition staged.
North and south poles of different eco-systems
LIU Ji-ping said: “I can not predict the exact year, but certainly in this century.” He said, from a biological point of view, Ocean surrounding Antarctica is the world’s most fertile waters, sea ice reduction may be “the Antarctic marine ecosystem have a significant impact. “, for example, many species rely on the Antarctic sea ice hunting and survival. Environmentalists said the Antarctic sea ice is subjected to one of the largest animal to reduce the threat that if the warming trend continues, many penguins from the Earth.
Ji-Ping Liu pointed out that the reduction of sea ice on ocean currents will affect the activities of the world: the Antarctic Ocean near the planet’s temperature minimum, maximum density of water, they are the ocean “global conveyor belt” (for three-quarters of marine organisms to provide nutrients loop mode) of “dominant driver” one. U.S. National Snow and Ice Data Center scientists Walter – Mel (Walt Meier), said the latest research results are not surprising, since they predicted before the match, that Antarctic sea ice disappears in the speed.
Mel said: “This is common sense – it has been proven model of physics.” Meyer said the latest study also help to eliminate a common misconception: the Arctic and Antarctic sea-ice reduction trend of sea ice will increase in balance, so the overall impact on Earth would not talk. This is not true, because the different ecosystems north and south poles.
Impact of the Antarctic ozone hole
According to Meyer describes, Arctic sea ice formation will take years, through several quarters, while the Antarctic sea ice formation and melting of each year, more subject to wind, air temperature, ocean circulation rather than domination. He said that this does not mean that the melting temperature lead to the phenomenon (such as the Arctic sea ice changes) will not occur in the Antarctic, but this process with a much longer time. National Center for Atmospheric Research senior scientist Kevin – Telunbosi (Kevin Trenberth) said there is a major new study omission: the black hole of the ozone layer.
Scientists said that during the summer, the ozone hole produced bright clouds to resist global warming played a “shield” role. New research shows that, with the ozone-depleting chemicals phased out use of CFCs, the ozone hole over Antarctica may eventually disappear. Dissipation in the clouds reflecting sunlight after the Southern Hemisphere temperature rise may be faster than the model predicted current speed.
Telunbosi wrote in an e-mail, the ozone hole is “Antarctica is not warming as the rest of the world as the reason. As some computer models indicate that, given how the ozone hole will recover, largely depend on developments, the latest paper did not address these areas. “Ji-Ping Liu also believe that changes in the Antarctic ozone hole on the sea ice play a role, but he said this is not the main reasons:” I’m still not sure