基于卫星高度计沿轨数据的南海北部陆架地转流异常反演
Inversion of the geostrophic current anomaly on the northern shelf of the South China Sea based on along-track satellite al-timeter data
摘要
Abstract
This study analyzes the cross-shelf characteristics of sea surface height anomaly data over the northern South China Sea shelf.For this purpose,it applies empirical orthogonal function decomposition(EOF)to these data from along-track satellite-altimeter measurements for 1993-2020.The results reveal clear seasonal and interannual variations in sea surface height anomalies and geostrophic current anomalies across the northern South China Sea.At the seasonal scale,sea surface height anomalies differ between the summer half-year(March-August)and the winter half-year(September-February).The amplitude of sea surface height anomalies on the nearshore side is ap-proximately 0.3 m in the winter half-year and-0.4 m in the summer half-year.At the interannual scale,there are clear fluctuations in sea surface height anomalies in 1997,2003,2007,and 2016.The EOF results reveal a tilted cross-shelf structure of sea surface height anomalies,with the amplitude reaching the maximum(minimum)value in October(May)each year.The geostrophic current anomaly retrieved from monthly sea surface height data is about 0.2 m/s,and the current flows in opposite directions in winter(westward)and summer(eastward).The fourth mode indicates that the geostrophic current anomaly on the continental shelf may be influenced by other dynamic pro-cesses.This paper expands the application of sea surface height anomaly data from along-track satellite altimeters to shallow continental shelf waters and provides valuable insights into regional ocean dynamics and climate re-search.关键词
卫星高度计/沿轨数据/地转流异常/陆架环流Key words
satellite altimeter/along-track data/geostrophic current anomaly/continental shelf circulation分类
海洋科学引用本文复制引用
孙伟杰,陈洁,杨涛,李迪,谢玲玲,李君益..基于卫星高度计沿轨数据的南海北部陆架地转流异常反演[J].海洋科学,2025,49(12):1-11,11.基金项目
国家自然科学基金(42276019,42476027) （42276019,42476027）
广东省基础与应用基础研究基金(2024A1515012572,2025A1515010741) （2024A1515012572,2025A1515010741）
广东普通高校创新团队项目(2023KCXTD015) （2023KCXTD015）
粤西热带海洋生态环境广东省野外科学观测研究站(2024B1212040008) （2024B1212040008）
广东海洋大学学生创新团队项目(CXTD2019001)National Natural Science Foundation of China,Nos.42276019,42476027 （CXTD2019001）
Guangdong Basic and Applied Basic Research Foundation,Nos.2024A1515012572,2025A1515010741 （）
Guangdong Province General Uni-versities Innovation Team Project,No.2023KCXTD015 （）
Tropical Ocean Environment in Western Coastal Waters Observation and Research Station of Guangdong Province,No.2024B1212040008 （）
Undergraduate Innovation Team Project of Guangdong Ocean University,No.CXTD2019001 本研究的漂流浮标数据得到国家自然科学基金委员会共享航次计划项目(项目批准号:42249911)的资助.漂流浮标(航次编号:NORC2023-11)由"天龙"号科考船实施布放 （项目批准号:42249911）
卫星高度计获取的沿轨海面高度异常数据(SEALEVEL_GLO_PHY_L3_MY_008_062),由欧洲哥白尼海洋环境观测服务中心(Copernicus Marine Environment Monitoring Service)分发,在此一并表示感谢. （SEALEVEL_GLO_PHY_L3_MY_008_062）
