Seasonal Variability of the Deep Western Boundary Current in the Philippine Sea
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Title
- Seasonal Variability of the Deep Western Boundary Current in the Philippine Sea
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Author(s)
- Song, Hajin; Zhu, Xiao-Hua; Zhu, Ze-Nan; Chae, Jeong-Yeob; Jeon, Chanhyung; Kim, Dong Guk; Min, Hong Sik; Lee, Jae Hak; Park, Jae-Hun
- KIOST Author(s)
- Kim, Dong Guk(김동국); Min, Hong Sik(민홍식)
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Alternative Author(s)
- 김동국; 민홍식; 이재학
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Publication Year
- 2023-07
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Abstract
- The deep western boundary current (DWBC) in the Philippine Sea has been expected to play a crucial role in transporting lower circumpolar deep water and to contribute to regional and global climate regulation. Two-year-long near-bottom current measurements reveal a southward-flowing DWBC with a mean velocity of 5 cm/s and seasonal variations—weaker in summer and stronger in winter. Seasonal variability in the DWBC is hypothesized to be induced by changes in the North Equatorial Current bifurcation latitude (NECBL) and upper pycnocline depth through potential vorticity conservation. Data-assimilated reanalysis model (GLORYS12V1) outputs, which reproduce the seasonal variability of DWBC similarly to the observation, are used for further analysis. During the seasonal period, the NECBL displays significant coherence (>0.9) with the first-mode empirical orthogonal function principal component of the simulated along-slope DWBC. The upper pycnocline depth, varying seasonally within a range of approximately 27 m, induces seasonal variability in a deep anticyclonic eddy trapped by topography. In summer, the intensified deep anticyclonic eddy obstructs the adjacent southward-flowing DWBC, weakening its strength, whereas in winter, the southward flow of the DWBC is enhanced due to the weakening of the deep anticyclonic eddy.
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ISSN
- 2077-1312
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/44478
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DOI
- 10.3390/jmse11071290
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Bibliographic Citation
- Journal of Marine Science and Engineering , v.11, no.7, 2023
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Publisher
- MDPI AG
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Keywords
- deep western boundary current; Philippine Sea; north equatorial current bifurcation latitude; deep eddy; seasonal variability
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Type
- Article
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Language
- English
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Document Type
- Article
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