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| 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 |
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孙伟杰1, 陈洁1,2, 杨涛3, 李迪1, 谢玲玲1, 李君益1,4
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1.广东海洋大学 海洋与气象学院, 广东 湛江 524088;2.自然资源部海洋咨询中心, 北京 100161;3.中国人民解放军92682部队, 广东 湛江 524001;4.自然资源部空间海洋遥感与应用重点实验室, 广东 湛江 524088
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| 摘要: |
| 利用卫星高度计获取的1993—2020年沿轨海面高度异常数据,使用经验正交函数分解方法对南海北部陆架海面高度异常数据的跨陆架特征进行了分析。结果显示南海北部海面高度及地转流异常的季节和年际变化明显。季节变化特征主要体现为夏半年(3—8月)与冬半年(其余月份)的海面高度异常数值不同。近岸侧海面高度异常在冬半年的振幅约为0.3 m,在夏半年则为–0.4 m;年际尺度上,海面高度异常在1997、2003、2007、2016年振荡振幅较大。卫星高度计沿轨数据的经验正交函数分解(EOF)显示,海面高度异常在跨陆架方向存在倾斜结构,其近岸处振幅在每年的10(3)月达到最大(小)值。由海面高度反演的月平均地转流异常最大约为0.2 m/s,夏半年沿陆架向东,冬半年沿陆架向西。通过对海面高度异常EOF分解结果的解读,可获得地转流在跨陆架方向的结构。 |
| 关键词: 卫星高度计 沿轨数据 地转流异常 陆架环流 |
| DOI：10.11759/hykx20250413001 |
| 分类号:P731 |
| 基金项目:国家自然科学基金(42276019,42476027);广东省基础与应用基础研究基金(2024A1515012572,2025A1515010741);广东普通高校创新团队项目(2023KCXTD015);粤西热带海洋生态环境广东省野外科学观测研究站(2024B1212040008);广东海洋大学学生创新团队项目(CXTD2019001) |
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| Inversion of the geostrophic current anomaly on the northern shelf of the South China Sea based on along-track satellite altimeter data |
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SUN Weijie1, CHEN Jie1,2, YANG Tao3, LI Di1, XIE Lingling1, LI Junyi1,4
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1.College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China;2.Marine Consulting Center of the Ministry of Natural Resources, Beijing 100161, China;3.92682 of the People's Liberation Army, Zhanjiang 524001, China;4.Key Laboratory of Space Ocean Remote Sensing and Application, National Satellite Ocean Application Service, Zhanjiang 524088, China
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| 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 approximately 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 processes. 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 research. |
| Key words: satellite altimeter along-track data geostrophic current anomaly continental shelf circulation |