讲座题目：Multi-temporal InSAR evidence of non-tidal ocean loading effects from Chaoshan coastal plain, China
主讲人：余凤玲 教授
主持人：陈静 研究员、刘演 研究员
开始时间：2025-05-23 15:30
讲座地址：闵行校区河口海岸大楼A204会议室
主办单位：河口海岸科学研究院
报告人简介：
Dr. Fengling Yu is a Professor at the College of Ocean and Earth Sciences (COE) and the State Key Laboratory of Marine Environmental Sciences (MEL), Xiamen University, China. She holds a Master’s degree from East China Normal University (ECNU) and a Ph.D. in Physical Geography from the University of Durham, UK. During her doctoral studies, she conducted research at the Earth Observatory of Singapore, Nanyang Technological University. As a Physical Geographer and Marine Geologist, Dr. Yu’s work focuses on coastal geomorphology, climate and sea-level change dynamics, sedimentary organic carbon processes across the land-ocean continuum, and offshore carbon storage solutions. Her interdisciplinary research bridges geological records with contemporary environmental challenges. She is also the co-leader of UNESCO-IUGS International Geoscience Programe (IGCP639, 2016-2020), titled “Sea-Level Changes from Minutes to Millennia”. She serves as the Special Issue Editor of Geomorphology, and an Associate Editor for the Acta Oceanologica Sinica, contributing to scholarly communication in earth and marine sciences. Her work underscores a commitment to understanding past and present environmental systems to inform sustainable coastal management and climate resilience strategies.
报告内容：
Ocean loading deformation is one of the key processes in geodesy, geophysics, and Isostasy, and is also important for assessment of future coastal environmental changes. Traditionally, the ocean tide loading has been considered the only contributor to the ocean loading deformation by most previous InSAR (Interferometric Synthetic Aperture Radar) studies. In this study, we quantify the non-tidal ocean loading deformation using the multitemporal InSAR-derived deformation data from the Chaoshan coast in southern China and explore its driving mechanisms. Our results show that InSAR deformation anomalies in the Chaoshan coastal area exhibit a distinct deformation gradient from the coast to inland. A strong scale- and direction-dependent pattern in InSAR data, with significant seasonality, is unveiled by the second-order spatial structure function. To explore the driving mechanism behind this deformation, we conduct a correlation analysis between spatial pattern of land deformation and sea level changes. The results indicate that ocean loading is the predominant driving factor behind the Chaoshan coastal deformation. Analysis using the MERRA2 model demonstrates that terrestrial water storage loading deformation is negligible in comparison. Furthermore, by applying the FES2014b tide model, we find that the contributions of the non-tidal and tide-induced ocean loading deformation to the total deformation anomaly are 50–70% and 30–50%, respectively. Lastly, we have uncovered that the non-tidal ocean loading is primarily attributed to the monsoon-induced seasonal sea level changes, with a time lag ranging from one to two months. Quantifying non-tidal ocean loading deformation provides valuable insights to large-scale high-precision coastal InSAR applications.
