Extreme melting in Greenland increased sixfold study

The Greenland Ice Sheet is undergoing an unprecedented transformation. Study from scientists from University of Barcelonapublished in the magazine Nature Communicationsshows that climate change has fundamentally changed the pattern of melting: extreme episodes have become more frequent, more intense and cover the whole world.is large areas. Since 1990, the area of ​​extreme melt zones has grown at a rate of 2.8 million km² per decade, and the volume of meltwater produced has increased more than sixfold.

Sixfold leap and 21st century records

An analysis of data from 1950 to 2023 reveals alarming dynamics. If in the early periods of observation exit meltwater averaged 12.7 gigatons per decade, by the last decade this figure had soared to 82.4 gigatons.

Scientists emphasize that seven of the ten most extreme melting events occurred after 2000. A special place is occupied by the anomalies of August 2012, as well as July 2019 and 2021. These events have no dynamic precedents in the past, which confirms their exceptional nature and direct connection with anthropogenic warming.

Process Physics: Thermodynamics vs. Dynamics

The research team used an innovative classification technique, combining regional climate models with air mass circulation patterns (cyclones and anticyclones). This made it possible to separate the influence of two factors: ddynamic (related to the movement of air masses) etcthermodynamic (related to general warming of the atmosphere).

It turned out that under the same meteorological conditions (for example, with an identical anticyclone) today appears 25% more water than in 1950–1975brother. Overall, the intensity of extreme episodes increased by 63%. The main “hot spot” has become the northern part of Greenland, where ice degradation is most active.

Global risks

Scientists’ forecasts are disappointing: under a scenario of high greenhouse gas emissions, by the end of the century the frequency and severity of extreme melting anomalies could increase threefold.

“The rapid transformation of the ice sheet not only entails rising sea levels and disruption of ocean currents, but also places the Arctic at the center of new strategic, economic and territorial disputes,” notes Josep Bonsoms, research director.

Understanding the mechanisms that increase melting is becoming critical not only for climate scientists, but also for policymakers. Greenland is ceasing to be a stable refrigerator of the planet, turning into a dynamic and unpredictable region, the changes in which every inhabitant of the Earth will feel.