fnctId=thesis,fnctNo=426
Lagrangian Analysis of the Korea Strait Throughflow in an Eddying Climate Model: Contributions of Seasonal and Decadal Variability
- 작성자
- 기후시스템전공
- 저자
- Hyeju An
- 발행사항
- 발행일
- 2026-02
- 저널명
- 국문초록
- 영문초록
- Water transport through the Korea Strait (KS), located between the Korean Peninsula and Japan, plays a critical role in delivering heat and nutrients to the East Sea, thereby influencing the regional marine environment and climate system. Understanding the variability in volume transport and the origin of water masses is essential for quantifying their broader impact. While previous studies have predominantly focused on short-term variability, such as seasonal and interannual changes, long-term (decadal-scale) variations remain less explored. This study addresses this gap by analyzing decadal-scale variability using Lagrangian particle tracking and further examines how seasonal variability modulates transport dynamics in this strongly seasonal region. The method is based on a high-resolution climate simulation derived from FOCI (Flexible Ocean and Climate Infrastructure), which includes an eddy-rich nested domain in the North Pacific with a 1/10° resolution (NPAC10). Although the model slightly underestimates the mean KS transport (~2.19 Sv) compared to observations, it captures seasonal and broader long-term variability. Spectral analysis identifies prominent decadal to multi-decadal variability. High- and low-decadal transport phases are defined using a 5-year moving average, and Lagrangian tracking experiments are conducted for each phase. The Taiwan Strait (TS) and the Kuroshio current (KC) east of Taiwan are identified as the primary sources of KS inflow. Their mean contributions are ~0.45 Sv and 0.39 Sv, respectively, accounting for about 38.5% of the KS transport (~2.19 Sv). During high transport phases, inflow from these regions is more efficient and faster, whereas low phases are associated with reduced contributions and delayed arrival times. While the overall transport pathways remained consistent across phases, the volume and timing of inflow differed. The seasonal cycle of KS transport exhibits a resemblance to the TS transport, with the two source regions displaying complementary seasonal patterns, where the Taiwan Strait inflow dominates in summer and the Kuroshio in winter. Decadal phases modulate both the volume and timing of inflow, with higher transport phases exhibiting more efficient and faster contributions. These findings enhance understanding of regional circulation dynamics and provide a basis for future studies on ecosystem and climate variability in the East Sea.
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