2024-07-31 ニューヨーク大学 (NYU)
＜関連情報＞
- https://www.nyu.edu/about/news-publications/news/2024/july/scientists-capture-new-view-of-how-the-ocean-melts-antarctica-s-.html
- https://www.science.org/doi/10.1126/sciadv.adn9188
渦巻きとスクープ 南極の棚氷のマルチビーム画像から明らかになった氷床の融解 Swirls and scoops: Ice base melt revealed by multibeam imagery of an Antarctic ice shelf
Anna Wåhlin, Karen E. Alley, Carolyn Begeman, Øyvind Hegrenæs, […], and Karen J. Heywood
Science Advances Published:31 Jul 2024
DOI:https://doi.org/10.1126/sciadv.adn9188
Abstract
Knowledge gaps about how the ocean melts Antarctica’s ice shelves, borne from a lack of observations, lead to large uncertainties in sea level predictions. Using high-resolution maps of the underside of Dotson Ice Shelf, West Antarctica, we reveal the imprint that ice shelf basal melting leaves on the ice. Convection and intermittent warm water intrusions form widespread terraced features through slow melting in quiescent areas, while shear-driven turbulence rapidly melts smooth, eroded topographies in outflow areas, as well as enigmatic teardrop-shaped indentations that result from boundary-layer flow rotation. Full-thickness ice fractures, with bases modified by basal melting and convective processes, are observed throughout the area. This new wealth of processes, all active under a single ice shelf, must be considered to accurately predict future Antarctic ice shelf melt.
