Greenland is losing ice seven times quicker than during the 1990s and is tracking the Intergovernmental Panel on Climate Change’s high-end climate warming situation, which would see 40 million additional individuals presented to waterfront flooding by 2100.
A group of 96 polar researchers from 50 international associations has created the most complete image of Greenland ice misfortune to date. The Ice Sheet Mass Balance Inter-comparison Exercise (IMBIE) Team consolidated 26 separate studies to figure changes in the mass of Greenland’s ice sheet somewhere in the range of 1992 and 2018. Altogether, information from 11 distinctive satellite missions was utilized, including measurements of the ice sheet’s changing volume, flow, and gravity.
The discoveries, published today in Nature, show that Greenland has lost 3.8 trillion tonnes of ice since 1992 – enough to push global sea levels up by 10.6 millimeters. The rate of ice misfortune has ascended from 33 billion tonnes for each year during the 1990s to 254 billion tonnes for each year in the last decade – a seven-fold increment within three decades.
The assessment, led by Professor Andrew Shepherd at the University of Leeds and Dr. Erik Ivins at NASA’s Jet Propulsion Laboratory in California, was supported by the European Space Agency (ESA) and the US National Aeronautics and Space Administration (NASA).
In 2013, the Intergovernmental Panel on Climate Change (IPCC) anticipated that global sea levels will ascend by 60 centimeters by 2100, putting 360 million individuals in danger of annual waterfront flooding. In any case, this new study shows that Greenland’s ice misfortunes are rising quicker than anticipated and are rather tracking the IPCC’s high-end climate warming situation, which predicts 7 centimeters more.
Professor Shepherd stated: “As a rule of thumb, for every centimeter rise in global sea level another six million people are exposed to coastal flooding around the planet.”
“On current trends, Greenland ice melting will cause 100 million people to be flooded each year by the end of the century, so 400 million in total due to all sea-level rise.”
“These are not unlikely events or small impacts; they are happening and will be devastating for coastal communities.”
The group additionally used regional climate models to show that half of the ice misfortunes were because of surface melting as air temperatures have risen. The other half has been because of the expanded glacier flow, triggered by rising ocean temperatures.
Ice misfortunes crested at 335 billion tonnes for every year in 2011 – ten times the rate of the 1990s – during a time of extreme surface melting. Even though the rate of ice misfortune dropped to rate 238 billion tonnes for every year from that point forward, this remaining parts seven times higher and does exclude all of 2019, which could set a new high because of across the board summer melting.
Dr. Ivins stated: “Satellite observations of polar ice are essential for monitoring and predicting how climate change could affect ice losses and sea-level rise.”
“While computer simulation allows us to make projections from climate change scenarios, the satellite measurements provide prima facie, rather irrefutable, evidence.”
“Our project is a great example of the importance of international collaboration to tackle problems that are global in scale.”
Guðfinna Aðalgeirsdóttir, Professor of Glaciology at the University of Iceland and lead author of the Intergovernmental Panel on Climate Change’s 6th evaluation report, who was not associated with the investigation, stated:
“The IMBIE Team’s reconciled estimate of Greenland ice loss is timely for the IPCC. Their satellite observations show that both melting and ice discharge from Greenland have increased since observations started.”
“The ice caps in Iceland had a similar reduction in ice loss in the last two years of their record, but this last summer was very warm here and resulted in a higher loss. I would expect a similar increase in Greenland mass loss for 2019.”
“It is very important to keep monitoring the big ice sheets to know how much they raise sea level every year.”
Disclaimer: The views, suggestions, and opinions expressed here are the sole responsibility of the experts. No Open Headline journalist was involved in the writing and production of this article.