首页|印度尼西亚—澳大利亚海盆上层海洋层结变化及其影响因素

印度尼西亚—澳大利亚海盆上层海洋层结变化及其影响因素

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  • NETL
  • NSTL
  • 万方数据
本文基于ORAS5(ocean reanalysis system)和ERA5(ECMWF reanalysis v5)再分析数据,利用密度跃层底的浮力频率表征海洋层结的强度对印度尼西亚—澳大利亚海盆及其周边海域的海洋层结特性及其影响因素进行研究.结果显示:该海盆海洋层结在空间上表现为北部较强、南部较弱,在时间上表现为北半球春季较强、秋季较弱.对海盆内混合层温度和盐度变化的影响因素分析表明,海表通量和海洋平流作用的贡献非常显著,特别是与印尼贯穿流相关的纬向平流通过影响次表层密度结构进而对跃层底层结产生重要影响.进一步分析印尼贯穿流通量对海盆内海洋层结的影响,发现了印尼贯穿流通量与该海盆的混合层界面上下的温盐异常密切相关,该盐度异常通过影响其垂向密度梯度进而对海洋层结的季节变化产生影响.
Ocean stratification in the Indonesian-Australian basin and its influencing factors
Based on ocean reanalysis system version 5(ORAS5)and ECMWF reanalysis v5(ERA5)data,the strength of oceanic stratification and its influencing factors in the Indonesian-Australian basin and its surrounding waters are revealed by using the buoyancy frequency of mixed layer bottom to characterize the oceanic stratification intensity.The results show that the oceanic stratification in this basin is stronger in the north and weaker in the south spatially,while stronger in the boreal spring and weaker in autumn temporally.The analysis of the factors influencing the changes of mixed layer temperature and mixed layer salinity in the basin highlights the significant contributions of surface flux and ocean advection.Particularly,zonal advection associated with the Indonesian Throughflow plays a crucial role in pycnocline stratification by affecting the density structure of the subsurface.Further analysis of the influence of the Indonesian Throughflow on the oceanic stratification in the basin indicates close relationships between the throughflow and thermohaline anomalies above and below the mixed layer interface of the basin;the salinity anomalies affect the seasonal variations in the oceanic stratification by influencing the vertical density gradient.

ocean stratificationIndonesia-Australia basintemperaturesalinitysea surface fluxsea advectionIndonesian Throughflow

林桂焕、严幼芳、刘颖

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热带海洋环境国家重点实验室,中国科学院南海海洋研究所,广东 广州 510301

中国科学院大学,北京 10004

海洋层结 印度尼西亚—澳大利亚海盆 温度 盐度 海表通量 海洋平流 印尼贯穿流

中国科学院战略性先导科技专项国家自然科学基金中国科学院地球系统模式的耦合初始化研究

XDB4201000042276023ZDBS-LY-DQC010

2024

10.11978/2023096

热带海洋学报
中国科学院南海海洋研究所

热带海洋学报

CSTPCD北大核心
影响因子：0.513
ISSN：1009-5470
年,卷(期)：2024.43(4)