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Interannual modulation of Kuroshio intensity in the East China Sea Over the Past Three Decades

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Abstract
Previous studies have suggested that westward-migrating mesoscale eddies are a dominant factor that modulate the interannual Kuroshio intensity in the East China Sea (ECS), indicating a close positive correlation between them. According to the extended record of altimetry-based sea level anomalies (SLAs) until 2020, however, the interannual variation of the Kuroshio intensity no longer has a strong positive correlation with eddy activity in the subtropical countercurrent (STCC) region since the early 2000s. Our observational analyses showed that the Kuroshio intensity in the ECS can be modulated by the combined effect of westward-migrating mesoscale eddies and westward-propagating oceanic planetary waves from the east. Until the early 2000s, the interannual variability of Kuroshio was mainly affected by eddy migration from the STCC region, associated with oceanic instability driven by large-scale wind patterns over the western North Pacific. Since then, oceanic planetary waves propagating westward across the Pacific basin have largely modulated the interannual variability of the ECS-Kuroshio intensity by superimposing the SLAs related to mesoscale eddies that propagated towards the east of Taiwan.
Author(s)
Jo Seonghyun
Issued Date
2023
Awarded Date
2023-02
Type
Dissertation
URI
https://dcoll.jejunu.ac.kr/common/orgView/000000011155
Alternative Author(s)
조성현
Affiliation
Graduate School Jeju National University
Department
대학원 지구해양융합학부
Advisor
Moon Jae-Hong
Table Of Contents
Index ⅰ
List of figures ⅱ
List of figures ⅲ
List of figures ⅳ
Abstract ⅴ
1. Introduction . 1
2. Data and methods . 5
2.1 Satellite altimetry . 5
2.2 Wind data . 5
2.3 Oceanic and climate indices . 6
2.4 EOF analysis 9
2.5 Numerical model 11
2.6 Ensemble mode decomposition 12
3. Result . 15
3.1 Interannual variability of Kuroshio intensity in the ECS . 15
3.2 Kuroshio intensity associated with mesoscale eddy activities . 22
3.3 SLAs propagating westward from central and eastern North Pacific 30
4. Conclusion. 40
5. References . 42
Degree
Master
Publisher
Graduate School Jeju National University
Citation
Jo Seonghyun. (2023). Interannual modulation of Kuroshio intensity in the East China Sea Over the Past Three Decades.
Appears in Collections:
Faculty of Earth and Marine Convergence > Earth and Marine Science
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  • 엠바고2023-02-17
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