报告人：Yoshihiro Nakayama（美国达特茅斯学院 助理教授）
时间：2025年8月27日（周三） 10:00-11:30
地点：测绘馆401会议室
报告简介：
How fast Antarctica will lose ice and contribute to sea-level rise has become one of today’s most urgent scientific questions. Antarctic ice-sheet mass loss is primarily triggered by the ocean, but relatively little is understood about the drivers of ocean warming where it matters – at the ice sheet margin – nor about the impact of ice-shelf melting on the ocean. We (a) conduct oceanographic observations, (b) improve ocean simulations achieving high model-data agreement, and (c) develop ice-ocean coupled simulations to better understand the past, present, and future state of the Southern Ocean and identify the causes of ocean warming and Antarctic ice loss on various time scales. My combined experience of leading polar ocean expeditions near rapidly melting ice shelves and developing high-fidelity regional models enables me to pursue research from an innovative perspective, yielding new insights and several high-impact publications. During fieldwork, I have led Antarctic expeditions with observational plans informed by modeling, including helicopter-based oceanographic surveys. This work uncovered warm ocean pathways to the Totten Ice Shelf, East Antarctica’s largest ice shelf and a major potential contributor to global sea-level rise. Through modeling, by adopting an observer’s perspective in model development, we rigorously evaluate simulations against field data and refine parameters to reproduce mean conditions, temporal variability, and the key physical processes that govern ice–ocean interaction. In this presentation, I will take the Totten ice shelf as an example, and I will talk about our recent studies targeted at this region by conducting observations and modeling.
报告人简介：
Dr. Nakayama is an Assistant Professor at Dartmouth College in the USA. He received his Ph.D. in natural science from the Universität Bremen (Germany). He worked for the Institute of Low Temperature Science in Hokkaido, Japan, before moving to the US. He aims to understand the rapidly changing polar oceans and ice sheets by combining observations and state-of-the-art numerical modeling.
