海洋科学2024，Vol.48Issue(3)：1-12,12.DOI:10.11759/hykx20221124003
多尺度耦合经验正交分解法反演海洋次表层温盐结构
Inversion of ocean subsurface temperature and salinity struc-ture by multiscale coupled empirical orthogonal decomposition
摘要
Abstract
To address the problem of reconstructing the three-dimensional ocean thermohaline salinity fields based on sea surface information obtained through satellite observation,a three-dimensional thermohaline field-reconstruction method based on multiscale coupled empirical orthogonal decomposition is proposed in this paper.The proposed method involves using a multiscale coupled empirical orthogonal function to iteratively de-compose historical temperature and salinity profiles from a large to a small scale to extract the feature information of three-dimensional thermohaline and salinity fields at different scales in a hierarchical manner.Then,models of the collected satellite information are established and the characteristic information of the involved three-dimensional thermohaline field is obtained at different scales to achieve three-dimensional thermohaline field reconstruction.Herein,multiscale coupled empirical and single-layer orthogonal decompositions are used to recon-struct three-dimensional thermohaline and salinity fields.The results indicate that the former is superior to the latter.Furthermore,with continuous refinement of the decomposition levels,the accuracy of the reconstructed thermoha-line field and its vertical-gradient accuracy are significantly improved,with Scheme 4 resulting in the highest im-provements(25.57%and 27.58%,respectively).Meanwhile,compared with the HYCOM,the proposed method can more effectively capture the spatial characteristics of the involved subsurface ocean.In general,thermohaline-field inversion based on the proposed method deviates less from the Argo thermohaline field;moreover,the accuracy of the inversion is better.Further,the obtained spatial distrtbution tends to be consistent,aiding in effectively analyz-ing the three-dimensional structure and variation characteristics of the ocean thermohaline field.关键词
卫星观测/多尺度耦合正交分解/温盐梯度/异常矩阵Key words
satellite observation/multiscale coupled empirical orthogonal function/vertical gradient/spatial characteristics分类
海洋科学引用本文复制引用
张明琪,徐永生,杨树国..多尺度耦合经验正交分解法反演海洋次表层温盐结构[J].海洋科学,2024,48(3):1-12,12.基金项目
崂山实验室科技创新项目(LSKJ202201406-2) （LSKJ202201406-2）
NSFC-山东省联合基金项目(U1406401) （U1406401）
国家自然科学基金项目(41906027) （41906027）
中国科学院战略性先导科技专项(XDB42000000) Laoshan Laboratory science and technology innovation pro-jects,No.LSKJ202201406-2 （XDB42000000）
NSFC-Shandong Joint Fund Key Project,No.U1406401 （）
National Natural Science Foundation of China,No.41906027,Strategic Priority Research Program of the Chinese Academy of Sciences,No.XDB42000000 （）
