报告人：Bertie Miles（英国爱丁堡大学 研究员）

时间：2025年9月9日（周二） 10:00-11:30

地点：空间信息中心204会议室

报告简介：

The calving fronts of the eastern outlets of the Getz Ice Shelf have been steadily retreating since the earliest satellite observations in the 1970s. This retreat has occurred despite minimal changes in ice shelf damage over the past 50 years, limited changes in ice velocity seaward of the grounding zone, and only modest thinning in the outlet experiencing the most significant retreat. Analysis of calving events using the Sentinel-1 archive (2014–2024) reveals a distinct seasonal cycle: frontal advance during winter and retreat in summer, a pattern reminiscent of many Greenland outlet glaciers influenced by the seasonal breakup of ice mélange. We attribute the seasonal calving at Getz to wave-driven undercutting of the ice front, which promotes rampart–moat style calving. Since 1978, the number of sea ice–free days in the polynya adjacent to the Getz Ice Shelf has doubled. The resulting seasonal increase in surface ocean heat content and wave activity provides a plausible mechanism for the ongoing retreat of the eastern outlets. This mechanism will progressively become more important as sea ice vacates the Antarctic coastline and is currently not included in numerical models simulating future change.

报告人简介：

Dr. Bertie Miles is a Chancellor’s Fellow at Edinburgh University. He received his Ph.D. and worked as Postdoc in Durham University. His scientific work focuses on remote sensing and glaciology with a particular interest in Antarctica. He has published papers in journals including Nature, Nature Geoscience, Nature Communications and Nature Reviews Earth & Environment.