There is an ongoing debate if the Arctic Ocean has already passed a "tipping point", and a 2013 study identified an abrupt transition to increased seasonal ice cover variability in 2007, which has persisted in following years.
There is an ongoing debate if the Arctic Ocean has already passed a "tipping point", defined as a threshold for abrupt and irreversible change. A 2013 study identified an abrupt transition to increased seasonal ice cover variability in 2007, which has persisted in following years.