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http://dx.doi.org/10.7850/jkso.2019.24.2.318

On the Persistence of Warm Eddies in the East Sea  

JIN, HYUNKEUN (Ocean Circulation and Climate Research Center, Korea Institute of Ocean Science and Technology)
PARK, YOUNG-GYU (Ocean Circulation and Climate Research Center, Korea Institute of Ocean Science and Technology)
PAK, GYUNDO (Ocean Circulation and Climate Research Center, Korea Institute of Ocean Science and Technology)
KIM, YOUNG HO (Ocean Circulation and Climate Research Center, Korea Institute of Ocean Science and Technology)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.24, no.2, 2019 , pp. 318-331 More about this Journal
Abstract
In this study, comparative analysis is performed on the long-term persisted warm eddies that were generated in 2003 (WE03) and in 2014 (WE14) over the East Sea using the HYCOM reanalysis data. The overshooting of the East Korea Warm Current (EKWC) was appeared during the formation period of those warm eddies. The warm eddies were produced in the shallow Korea Plateau region through the interaction of the EKWC and the sub-polar front. In the interior of the both warm eddies, a homogeneous water mass of about $13^{\circ}C$ and 34.1 psu were generated over the upper 150 m depth by the winter mixing. In 2004, the next year of the generation of the WE03, the amount of the inflow through the western channel of the Korea Strait was larger, while the inflow was lesser than its climatology during 2015 corresponding to the development period of the WE14. The above results suggest that the heat and salt are supplied in the warm eddies through the Tsushima Warm Current (TWC), however the amount of the inflow through the Korea Strait has negligible impact on the long-term persistency of the warm eddies. Both of the warm eddies were maintained more than 18 months near Ulleung island, while they have no common feature on the pathways. In the vicinity of the Ulleung basin, large and small eddies are continuously created due to the meandering of the EKWC. The long-term persisted warm eddies in the Ulleung Island seem to be the results of the interaction between the pre-existed eddies located south of the sub-polar front and fresh eddies induced by the meanderings of the EKWC. The conclusion is also in line with the fact that the long-term persisted warm eddies were not always created when the overshooting of the EKWC was appeared.
Keywords
Warm eddy; Eddy interaction; East Sea; Reanalysis;
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