Temporal-spatial oceanic variation in relation with the three typical Kuroshio paths south of Japan

Empirical orthogonal function (EOF) analysis was applied to a 50-year long time series of monthly mean positions of the Kuroshio path south of Japan from a regional reanalysis. Three leading EOF modes characterize the contributions from three typical paths of the Kuroshio meander: the typical large...

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Bibliographic Details
Published in:Acta oceanologica Sinica 2022-02, Vol.41 (2), p.15-25
Main Authors: Wu, Xiaobo, Zhao, Yanling, Han, Guijun, Li, Wei, Shao, Qi, Cao, Lige, Li, Chaoliang
Format: Article
Language:English
Subjects:
Analysis
Climatology
Datasets
Decades
Earth and Environmental Science
Earth Sciences
Ecology
Empirical analysis
Engineering Fluid Dynamics
Environmental Chemistry
Fields
General circulation models
Marine & Freshwater Sciences
Ocean circulation
Oceanic analysis
Oceanography
Offshore
Original Article
Orthogonal functions
Spatial variations
Spectral analysis
Spectrum analysis
Time series
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Summary:Empirical orthogonal function (EOF) analysis was applied to a 50-year long time series of monthly mean positions of the Kuroshio path south of Japan from a regional reanalysis. Three leading EOF modes characterize the contributions from three typical paths of the Kuroshio meander: the typical large meander path, the offshore non-large meander path, and the nearshore non-large meander path, respectively. Accordingly, the spatial variation characteristics of oceanic anomaly fields can be depicted by their regression fields upon the associated three leading principal components (PCs), which are well-matched with the results of composite analysis corresponding to each period of the three typical Kuroshio paths. A new index for the typical large meander is defined by using the second leading PC, which is highly correlated with the Kushimoto-Uragami index. Spectral analysis of this new index series shows variability of the Kuroshio path south of Japan at time scales of about 7–8 years and 20 years.
ISSN:0253-505X
1869-1099
DOI:10.1007/s13131-021-1941-9