Scientists have discovered that Greenland’s ice sheet could completely melt if global temperatures rise by just 3.4°C compared to pre-industrial levels. The study, published in The Cryosphere, found that a tipping point is triggered when approximately 230 gigatons of ice are lost in a single year. This is about 60% of the surface mass balance compared to pre-industrial times.
Dr. Michele Petrini of Norway’s Bjerknes Centre for Climate Research and colleagues conducted the research. They used modeling to simulate various climate impacts on the surface mass balance of Greenland’s ice sheet.
If the tipping point is reached, it could lead to a rapid decline of over 8,000 to 40,000 years, resulting in the nearly complete melting of the ice sheet.
Greenland’s critical tipping point identified
The ice sheet’s current state is influenced by factors such as its elevation and glacial isostatic adjustment, in which the land begins to rise as the ice melts, reducing the weight on the bedrock.
The study emphasizes that as the ice sheet surface lowers due to melting, the underlying bedrock does not rise quickly enough to counterbalance the ice loss, pushing the ice sheet closer to complete melting. Additionally, surface albedo feedbacks exacerbate the situation, as the less reflective land and ocean absorb more solar radiation, increasing the ambient temperature and causing further melting. However, the research identifies the western margin of Greenland’s ice sheet as a potential stabilizer.
If this margin, with its high topography, can maintain its coastal connection, it could minimize ice loss and slow the retreat. The study highlights the urgent need to combat climate change to prevent surpassing global temperature thresholds that could trigger this and other critical tipping points. The complete melting of Greenland’s ice sheet would have significant consequences, including rising sea levels that could affect coastal communities worldwide.
April Isaacs is a news contributor for DevX.com She is long-term, self-proclaimed nerd. She loves all things tech and computers and still has her first Dreamcast system. It is lovingly named Joni, after Joni Mitchell.
