Two-step harmonic analysis for capturing seasonally-varying amplitudes and phase lags of the predominant tidal constituents

作     者：Anzhou Cao Zheng Guo Anzhou Cao;Zheng Guo

作者机构：Ocean CollegeZhejiang UniversityZhoushan 316021China Marine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316021China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2020年第39卷第7期

页      面：165-174页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：The National Natural Science Foundation of China under contract No.41806012 

主　　题：tides harmonic analysis seasonal variation tidal gauges 

摘      要：Recent studies have revealed that the predominant tidal constituents have seasonal variations at some ***,how to accurately obtain these variations remains a problem for the traditional harmonic analysis(HA)due to the tradeoff between length of time window and resolution of ***,a method named astwo-step HAis developed in this study,which consists of both long-and short-time-window *** a series of ideal experiments,practical application at two tidal gauges and comparison with the traditional HA,the feasibility and accuracy of the two-step HA are verified:The two-step HA performs better than the traditional HA in estimating monthly amplitudes and phases for the predominant constituents,whether they have seasonal variability or *** addition to capturing variations of the predominant constituents at tidal gauges,the two-step HA would be useful in investigation of the coherence and incoherence of internal tides.