南海中尺度涡温盐异常三维结构

谢旭丹; 王静; 储小青; 程旭华

doi:10.3969/j.issn.0253-4193.2018.04.001

南海中尺度涡温盐异常三维结构

doi: 10.3969/j.issn.0253-4193.2018.04.001

1.
中山大学地理科学与规划学院广东省城市化与地理空间模拟重点实验室, 广东广州 510275
2.
中国科学院南海海洋研究所热带海洋环境国家重点实验室, 广东广州 510301

基金项目: 国家自然基金项目（41276108，41676010，41476011，41522601，41276025）。

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出版历程
- 收稿日期: 2017-03-15
- 修回日期: 2017-10-11

Three-dimensional thermohaline anomaly structures of mesoscale eddies in the South China Sea

1.
Guangdong Provincial Key Laboratory for Urbanization and Geo-simulation, School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China
2.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

摘要

摘要: 基于1994-2015年海面高度异常数据，采用winding-angle中尺度涡旋探测算法识别出南海范围内共5 899个反气旋涡（AE）和3 792个气旋涡（CE），结合世界海洋数据集（WOD13）及中国科学院南海海洋研究所（SCSIO）温盐观测数据集，采用基于变分法的客观插值方法，合成了南海及南海各区域中尺度涡的温盐异常三维结构。结果表明，本文采取的插值方式能有效地获得涡旋三维结构，垂向尺度上也与前人研究结果较为一致。在平均状态下，南海AE温盐异常强度明显大于CE，AE正位温异常主体结构深度约440 m，而CE仅在320 m以浅维持涡旋结构；两者最大位温异常均出现在次表层约80 m上下，AE达2.02℃，CE达-1.60℃。盐度异常影响深度约150 m，最大盐度异常出现在50 m深附近，AE达-0.24，CE达0.28，同时由于涡旋在不单调变化的背景盐度场中引起海水下沉（上升），AE盐度异常结构呈"上负下正"而CE呈"上正下负"式结构。南海各区域合成涡旋的温、盐异常的影响程度并不完全相同，可能与各区域涡旋的生成机制及背景温盐场有关。
- 中尺度涡 /
- 温盐异常 /
- 合成涡旋 /
- 三维结构
Abstract: Used the Sea Level Anomaly data during 1994 to 2015, based on the winding-angle eddy detection algorithm, total of 5 899 anticyclonic eddies (AE) and 3 792 cyclonic eddies (CE) in the SCS are identified. With the profiles from the WOD13 and the SCSIO, the 3-D thermohaline anomaly structures are constructed in the SCS and its different area with the objective interpolation approach based on the variational analysis. The results show that the proposed revised interpolation approach can simulate the boundary of eddies effectively, and ensure the correct eddies shape. Generally speaking, AE's intensity are obviously stronger than CE's. AE maintain its main structure till approximately 440 m depth while CE only remain stable above 320 m. Both of the maximum potential temperature anomalies appear in about 80m depth, 2.02℃ for AE and -1.60℃ for CE. The affecting depth of salinity anomaly of eddies reach to 150 m depth around and the maximum anomalies induced by AE and CE are -0.24 and 0.28, respectively, which occur near the depth of 50 m. Meanwhile, the structure of salinity anomaly of AE seems to be positive on the top and negative on the bottom, just opposite to CE,which attributed to the sea water sinking (rising) induced by AE(CE). The temperature anomalies in each area of the SCS are not quite consistent with the salinity anomalies, which may attributed to the background thermohaline fields and different formation mechanism of eddies.
- mesoscale eddies /
- thermohaline anomaly /
- composite eddies /
- three-dimensional structures

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参考文献(24)

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