Scientists have mapped 332 Antarctic canyon networks to help assess the future course of climate breakdown, according to a study published in Marine Geology. The research shows submarine valleys reaching depths of over 4,000 metres, more than twice that of the Grand Canyon.
The data indicates these canyons may have a greater impact than previously thought on ocean circulation, ice-shelf thinning, and climate change. The study was conducted by researchers from the University of Barcelona and University College Cork.
David Amblàs of the research team noted that Antarctic canyons tend to be larger and deeper due to prolonged polar ice action and sediment transport by glaciers. He emphasised the need for continued high-resolution mapping to improve climate models.
Submarine canyons play a crucial role in sediment movement, nutrient transport, and creating biodiverse habitats. Only 27% of Earth's seafloor has been mapped in high resolution, with polar regions particularly underexplored.
The maps, derived from the International Bathymetric Chart of the Southern Ocean, reveal complex, branching canyon systems in east Antarctica. These canyons channel warm water towards the coast, thinning ice shelves and contributing to sea-level rise, said researcher Riccardo Arosio.
