Three-dimensional circulation numerical simulation of the East China Sea during spring 2001

doi:10.3969/j.issn.1001-909X.2017.04.001

Abstract

Abstract: On the basis of observed hydrological data in the East China Sea during April 2001, a three-dimensional model—FEOM (Finite Element Ocean Model) was applied to perform numerical analysis on the circulation in this region. The model uses single node linear triangular mesh for the horizontal grid and z-coordinate in vertical direction. Objective analysis method was introduced to interpolate this data to all the nodes to obtain the initial temperature and salinity condition, preparing for numerical experiments running respectively by diagnostic and robust diagnostic calculation. The computed results show that: (1) Stream function and flux calculated from the modified inverse method can reveal the velocity distribution of the study area well, and it can provide reliable open boundary condition to this simulation. (2) The finite element model has obvious advantages in respects to grid degree of freedom and full coverage of the study area. The high resolution vertical z-coordinate can also fit well with sea bottom topography, resulting in higher resolution results of three-dimensional numerical simulation. (3) Through the diagnostic calculation, the multi-eddy structure of the spring circulation in the East China Sea is reproduced, and the flow system of the Taiwan Warm Current, the Yellow Sea Coastal Current and the Yellow Sea Warm Current are distinguished. (4) Diagnostic and robust diagnostic calculation results agree qualitatively, but there are still some differences. In terms of overall distribution, the structure of the robust diagnostic calculation is more reasonable.

Key words: East China Sea, three-dimensional circulation, finite element model, diagnostic calculation

CLC Number:

P731.21

ZHENG Yang-yang, WANG Hui-qun, GUAN Wei-bing, YANG Cheng-hao, HUANG Hai-long, YANG Yun. Three-dimensional circulation numerical simulation of the East China Sea during spring 2001[J]. Journal of Marine Sciences, 2017, 35(4): 1-13.

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