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Scientists say that rapid loss of Antarctic ice could be a tipping point for climate change.

Scientists say that rapid loss of Antarctic ice could be a tipping point for climate change.

A scientific study published Thursday warned that rapid loss of Antarctic sea-ice could tip the climate in a way that is impossible to reverse. It would cause sea level to rise, ocean currents to change and marine life to disappear.

The Nature paper aims to describe the effects of global warming in Antarctica, the continent frozen at the South Pole.

It said that "Evidence of rapid, interdependent and sometimes self-perpetuating change in the Antarctic environment is emerging."

The study used data from observations, ship logbooks, and ice cores to chart the long-term change in sea ice. It also put into context a rapid decrease in recent years.

It said that a regime shift had reduced Antarctic sea ice extent below its natural variability in past centuries. In some ways, it was more abrupt, nonlinear, and potentially irreversible, than Arctic sea ice loss.

Nerilie Abram, lead author of the study, explained that changes are having knock-on impacts across the ecosystem, which in some cases amplify one another.

A smaller ice-sheet reflects less sunlight, which means the planet will absorb more heat. It is also likely to accelerate the weakening the Antarctic Overturning Circulation (AOC), an ocean current that distributes nutrients, regulates the weather, and distributes heat.

The loss of ice has a negative impact on wildlife, including the emperor penguins that breed on ice and the krills which feed beneath it.

The study found that warming of surface waters will reduce the phytoplankton population, which is responsible for removing vast amounts of carbon dioxide from the atmosphere.

Abram, former professor of the Australian National University and chief scientist for the Australian Antarctic Division, said that the Antarctic sea ice could be one of the Earth's tipping points.

The study stated that reducing global carbon dioxide emissions could reduce the risk but not necessarily prevent major changes to the Antarctic.

Abram explained that "once we begin to lose Antarctic sea ice we will set in motion this self-perpetuating cycle." Even if we stabilize the climate, we will still lose Antarctic sea ice for many centuries.

(source: Reuters)