Science, Space and Technology News 2024
A team led by glaciologists at UC Irvine used satellite radar data to reconstruct the impact of warm ocean water surging in a grounding zone extending several kilometers beneath Thwaites Glacier in West Antarctica. The research, the subject of a paper published in, will help climate modelers derive more precise projections of sea level rise resulting from the melting of ocean-terminating glaciers around the world.
Screenshot of a 3D view of the tidal motion of Thwaites Glacier, West Antarctica recorded by the ICEYE Synthetic Aperture Radar constellation based on images acquired on May 11, 12, and 13, 2023. Contour levels are bed topography contours at 50 m interval. Each interferometric fringe color cycle is a 360 degree change in phase, equivalent to a 1.65 cm displacement in line-of-sight distance of the ice surface. The interferogram is overlaid on a Landsat 9 image acquired in February 2023.
And it’s not just any seawater. For decades, Rignot and his colleagues have been gathering evidence of the impact of climate change on ocean currents, which push warmer seawater to the shores of Antarctica and other polar ice regions. Circumpolar deep water is salty and has a lower freezing point. While freshwater freezes at zero degrees, saltwater freezes at minus two degrees, and that small difference is enough to contribute to the “vigorous melting” of basal ice as found in the study.
France Dernières Nouvelles, France Actualités
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