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Intermediate level circulation in the southwestern part of the Japan/East Sea

This study explores the intermediate level circulation in the southwestern part of the Japan/East Sea (JES) using autonomous drifters deployed at depths of 500m, 700m, and 800m from 1998 to 2003. The research highlights the weak stratification, complicated bottom topography, and various factors affecting circulation patterns, such as a cyclonic boundary current along Korean and Japanese coasts and the influence of the Ulleung Basin. This work integrates findings from previous studies and provides critical insights into flow variability and topography's role in circulation dynamics.

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Intermediate level circulation in the southwestern part of the Japan/East Sea

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  1. Intermediate level circulation in the southwestern part of the Japan/East Sea Young-Gyu Park, Kyung-Hee Oh, Moon-Sik Suk, Kyung-Il Chang Korea Ocean Research & Development Institute Yonghoon Yoon, METRI

  2. Introduction • Intermediate level circulation in the southwestern part of JES • Very weak stratification • Circulation from hydrography: hard • Sparse current meter mooring • Chang et al. (2002), Teague et al. (2003) • Complicated bottom topography

  3. Goal • Intermediate level circulation from autonomous drifters • Drifting depth: 500m, 700m and 800m • 1998-2003: KORDI and METRI • APEX, PALACE

  4. From SOC

  5. Method • Divide the area into bins of 0.5O X 0.5O • Average over each bin

  6. Errors • Uncertainty in fix • Drift at the surface • Lags between actual surfacing & decending times and the fix • Drifts during descending and ascending • Vertical shear • Drifting depth of floats: 500m, 700m, 800m • Correction based on geostrophic calculation (Lavender et al, 2000) • In JES the vertical shear is small

  7. Chang et al 2002

  8. Verify the results by comparing with current meter mooring Teague et al

  9. Stommel and Arons (1972)

  10. 5cm/s Holloway, 1995 Topo Stress

  11. Conclusions and Summaries • Cyclonic boundary current along Korean and Japanese coasts • Relation to near shore branch of Tsushima current? • Widening to the downstream. • Outflow from the Ulleung Basin • Anticyclonic current over Korean Plateau • Taylor column? • Inflow to the Ulleung Basin • High variability in the Ulleung basin • Topography controls the flow.

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