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基于卫星测高与卫星测温的表层流产品生成方法应用评估
刘秀青,张杰,杨俊钢,曹蕾
1.自然资源部第一海洋研究所;2.自然资源部海洋遥测技术创新中心
摘要:
提高海洋表层流的精度与分辨率对于相关应用领域至关重要。在本研究中,研究了引入海表面温度(SST)信息对高度计导出流场的改进效果,计算了2018年每日无间隙的全球海洋表层流速度。通过增加热量守恒方程约束,引入卫星测温产品,在地转流基础上生成表层流产品,并与现场漂移浮标速度比较,评估了使用多源卫星遥感获取海流的质量。研究表明,该方法对沿等温线的法向流速分量有约束,对于切向分量无改进效果,方法性能对卫星测温数据具有依赖性;方法不适用于海表面温度梯度较小区域,在梯度较大区域可获得明显改进;优化流场能更好地刻画海面海流变化,证明结合卫星测高与卫星测温可改善海洋表层流动;存在强烈中尺度活动和热梯度区域,增加SST观测能够弥补测高资料的不足。
关键词:  表层流  卫星测高  卫星测温  热量守恒方程
DOI:10.11693/hyhz20200600169
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
APPLICATION EVALUATION OF SURFACE CURRENTS PRODUCT GENERATION METHOD BASED ON SATELLITE ALTIMETRY AND SATELLITE TEMPERATURE MEASUREMENT
liu xiu qing1, zhang jie1,2, yang jun gang1, cao lei3
1.First Institute of Oceanography, MNR;2.Ocean Telemetry Technology Innovation Center, MNR;3.Ocean Telemetry Technology Innovation Center, MNR,
Abstract:
Improving the accuracy and resolution of ocean surface currents is crucial for related applications. In this study, the improvement effect of the introduction of sea surface temperature information (SST) on the altimeter derived current field was studied, and the daily gapless global ocean surface current velocities in 2018 was calculated. By adding constraints of the heat conservation equation, introducing satellite temperature measurement products, generating surface current products on the basis of geostrophic current, and comparing with the in-situ drifting buoy velocities, the quality of currents obtained by multi-source satellite remote sensing was evaluated. Studies have shown that this method has constraints on the normal velocity component along the isotherm, and has no improvement effect on the tangential component. The performance of the method is dependent on the satellite temperature measurement data; This method is not suitable for regions with low SST gradient, and significant improvements can be obtained in regions with strong SST gradient; The optimized current field can better describe the change of sea surface current, which proves that the combination of satellite altimetry and satellite temperature measurement can improve the surface flow of the ocean; In areas with strong mesoscale activities and thermal gradients, increasing SST observations can make up for the lack of altimetry data.
Key words:  surface currents  satellite altimetry  satellite temperature measurement  heat conservation equation
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