Washington DC [US], August 21: Rapid loss of Antarctic sea ice could be a tipping point for the global climate, causing sea level rises, changes to ocean currents and loss of marine life that are impossible to reverse, a scientific study published, opens new tab on Thursday said.
The paper in the journal Nature aimed to describe in previously unseen detail the interlocking effects of global warming on the Antarctic, the frozen continent at the planet's South Pole.
The study gathered data from observations, ice cores, and ship logbooks to chart long-term changes in the area of sea ice, putting into context a rapid decline in recent years.
Changes are having knock-on effects across the ecosystem that in some cases amplify one another, said Nerilie Abram, the study's lead author.
A smaller ice sheet reflects less solar radiation, meaning the planet absorbs more warmth, and will probably accelerate a weakening of the Antarctic Overturning Circulation, an ocean-spanning current that distributes heat and nutrients and regulates weather.
Loss of ice is increasingly harming wildlife including emperor penguins, who breed on the ice, and krill, which feed below it.
And warming surface water will further reduce phytoplankton populations that draw down vast quantities of carbon from the atmosphere, the study said.
Reining in global carbon dioxide emissions would reduce the risk of major changes in the Antarctic but still may not prevent them, the study said.
Source: Fijian Broadcasting Corporation
