In a bold attempt to mitigate the impact of climate change, scientists are exploring methods to refreeze the Arctic. This project, which initially seems straight out of a science fiction novel, aims to curb the rise of the sea level by thickening the Arctic ice.
Refreezing the Arctic: a crucial mission
The approach of the Real Ice group, based in Cambridge Bay, Nunavut, Canada, involves pumping seawater onto the ice during the winter. Funded by the British agency ARIA and in collaboration with the University of Cambridge, this project seeks to increase the ice’s resistance to seasonal thawing.
In their initial tests, the team managed to increase the ice thickness by about 50 centimeters by pouring approximately 50,000 tons of ocean water over a natural layer of 1.5 meters. Although it’s still early to declare success, this represents a significant advance in a region where every week of ice counts.
The technique takes advantage of the temperature difference between the Arctic air and the seawater. During the cold winters, the pumped water quickly freezes upon contact with the air. This is not intended to create new ice but to reinforce the existing ice to delay its summer melting.
The sea ice plays a crucial role as a natural mirror, reflecting sunlight back into space. However, as the ice diminishes, the dark ocean absorbs more heat, intensifying global warming.
The statistics are alarming. According to Climate.gov, the Arctic ice coverage in summer has decreased by about 13% per decade since satellite records began. The Intergovernmental Panel on Climate Change (IPCC) warns that the Arctic could experience ice-free summers before 2050.
The research in Cambridge Bay faces extreme temperatures reaching 40 degrees below zero. The goal is to analyze how these conditions affect the ice in terms of salinity, structure, and thickness.
Initial satellite images of the treated area show a white island of ice surrounded by meltwater pools. Additionally, the artificially thickened ice reflected more light than the surrounding natural ice, probably due to the capture of air bubbles during the freezing.
However, the project is not without criticism. Some scientists argue that these polar geoengineering initiatives may divert attention from the urgent need to reduce emissions of greenhouse gases.
The big question is whether this technique could be applied on a significant scale to impact the global climate or if it will only serve to protect local routes for longer. As research continues, the project remains a test, not a definitive solution.
The latest study on this technique has been published in the journal Earth’s Future, detailing the findings and potential impact of this intervention.
