Oceanography of the East Sea (Japan Sea)

Chang, Kyung‐Il; Zhang, Chang-Ik; Park, Chul; Kang, Dong‐Jin; Ju, Se‐Jong; Lee, Sanghoon; Wimbush, Mark

doi:10.1007/978-3-319-22720-7

Cited by 54 publications

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“…Two currents-the East Korea Warm Current (EKWC) and the North Korea Cold Current (NKCC)-have long been recognized to flow in opposite directions along the western boundary of the East Sea (Japan Sea) off the Korean east coast. The EKWC, a branch of the Tsushima Warm Current, flows poleward along the coast year-round carrying relatively high-salinity warm water, termed High Salinity Tsushima Warm Water (HSTWW; S > 34.3, T > 10°C, where S and T are salinity and water temperature, respectively), and frequently accompanied by low-salinity warm water, particularly during the summer and autumn, termed Low-Salinity Tsushima Warm Water (LSTWW; S < 34.0, T > 10°C; Chang et al, 2016). The NKCC flows equatorward carrying low-salinity cold water termed North Korea Cold Water (NKCW; S < 34.05, T > 10°C) and is often clearly apparent from the spring to summer (Kim et al, 2009;Yun et al, 2004;see Figures 1a and 1c).…”

Section: Introductionmentioning

confidence: 99%

Causes of Interannual Variation of Summer Mean Alongshore Current Near the East Coast of Korea Derived From 16‐Year‐Long Observational Data

Park

Nam

2018

JGR Oceans

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Interannual variation in the summer surface current near the east coast of Korea was analyzed using long‐term (~16 years) time series measurements. Significant interannual variations in the summer alongshore current, which have a magnitude comparable to that of the climatological summer mean (equatorward) current, were observed. Positive anomalies (more poleward) occurred during 2001, 2009, 2010, and 2014; negative anomalies (more equatorward) occurred during 2002, 2006, and 2012. A linear combination of equatorward propagating coastal‐trapped waves, forced primarily by remote winds off the Russian coast, and an upwelling/downwelling response to local wind forcing, though contribution of the latter is not as significant as that of the former, successfully reproduced (46%) the observed anomalies in the alongshore current (correlation coefficient of 0.68). The influence of cross‐shore movement of the poleward flowing offshore current explains 35% of the total variance in the interannual anomalies of the alongshore current (correlation coefficient of 0.59), yielding less equatorward or slight poleward current near the coast in 2001 and 2009 with onshore movement of the offshore current. The combined effects of wind and offshore current explain ~72% (correlation coefficient of 0.85) of the anomalies in the alongshore current observed during summer near the east coast of Korea, providing significant implications for interannual current dynamics near the midlatitude western boundary.

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Section: Introductionmentioning

confidence: 99%

Causes of Interannual Variation of Summer Mean Alongshore Current Near the East Coast of Korea Derived From 16‐Year‐Long Observational Data

Park

Nam

2018

JGR Oceans

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“…The EJS, located in the far eastern part of the Eurasian continental margin, is one of the deepest marginal seas (maximum depth: 3,800 m, average depth: 1,650 m) in the northwestern Pacific (Figure 1). The surface area of the EJS covers approximately 1.01 × 10 6 km 2 (Lee et al, 2016) and is connected with four narrow shallow straits (Korea, Tsugaru, Soya, and Tatarsky). In the southern part of the EJS, the UB is one of the three major basins (UB, Japan Basin, and Yamato Basin), faced with the entrance of oligotrophic warm water (Tsushima current) that branches out and meanders along the coastline of Korea.…”

Section: Study Areamentioning

confidence: 99%

“…The northern and eastern margins of the UB are characterized by the slope, which is relatively straight and steep (>10°), compared with those of the southern and western margins (1-2°; Lee et al, 2016). The SRs across the slope to the basin ranged from 0.02 to 0.31 cm/year, being higher in the slope region and lower in the basin (Cha et al, 2005).…”

Section: Study Areamentioning

confidence: 99%

Sedimentary Organic Carbon Budget Across the Slope to the Basin in the Southwestern Ulleung (Tsushima) Basin of the East (Japan) Sea

Lee

Han

et al. 2019

JGR Biogeosciences

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With the total sediment oxygen uptake rates measured using an in situ benthic chamber, vertical distributions of organic carbon, and sedimentation rates estimated by excess 210Pb across the slope to the basin sediment of the southwestern region of the Ulleung (Tsushima) Basin (UB), the partitioning of organic carbon fluxes in the sediment was estimated to understand the biogeochemical cycles of organic carbon in the high productivity marginal sea. The results of depth attenuation of total oxygen uptake (TOU) demonstrate that the organic carbon oxidation of the UB sediment was 2.5 times higher than that obtained from the empirical relationship of the global's depth attenuation of TOU. Similar to TOU, the high mass accumulation rates observed in the slope region were 9.5 times higher than the rate in the basin, indicating that the slope may act as the depocenter of organic carbon. The organic carbon budget with water depth gradient implies that a significant fraction of the organic carbon deposited into sediment is supplied by lateral transport down the slope. Definite increasing C/N ratio with water depth indicates that the refractory organic carbon seems to be successively transported later from shelf to slope. The total burial flux in the sediment of southwestern UB was estimated to be 0.46±0.04 Tg C/year, which is similar to the megadepocenter of the Congo River fan. Our results imply that the UB sediment may be an important biogeochemical reaction place not only for organic carbon but also materials linked to primary production.

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“…1a). The East Sea, which is influenced by the East Asian Monsoon, is a semi-enclosed marginal sea connected via four straits to the Pacific Ocean and the East China Sea 10,11 . Sediment of various provenances enters the East Sea via monsoons and the Tsushima Warm Current (TWC) flowing through the Korea (Tsushima) Strait (KS).…”

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confidence: 99%

“…1c). These straits maintained narrow paleochannel features during the LGM and thus played an important role in transporting terrestrial sediments from the Yellow Sea, the southern sea shelf of the KP, and other sites of origin 10,14,17,20,22,23 . As the water depths of the strait and shelves were included in the ranges of eustatic sea-level curves, the areas of exposed shelves and the water depths of main straits changed in response to eustatic sea-level changes; therefore, the distance from nearby sediment sources to the ESKP also changed.…”

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confidence: 99%

New findings on palynofacies characteristics of semi-enclosed deep-sea environments in the East Sea over 2 million years

Kim

Jun

et al. 2020

Sci Rep

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Phytoclasts in the form of plant debris in terrestrial sediments can be transported by water to distant areas because they are lighter than inorganic particles. The semi-enclosed East Sea, which is connected by narrow straits to other seas, is adjacent to continental shelves that are the source area of terrestrial sediment flowing into the East Sea. These shelves alternated repeatedly between terrestrial and marine environments as a result of eustatic sea-level changes during the Late Quaternary. Palynofacies analyses of the IODP Exp. 346 U1430 core, located in the Eastern South Korea Plateau (ESKP) of the East Sea, have revealed changes in the size and concentration of phytoclasts associated with glacial–interglacial cycles. These changes are generally negatively correlated with the global sea-level curve, and their anti-phase cycles with high amplitude are clearly evident during the last ca. 750 ka with the geotectonic stabilization period. In particular, several coarse-grained phytoclasts were observed during the glacial period, including the Last Glacial Maximum (LGM). These findings suggest that the concentration and size of phytoclasts flowing into the East Sea were influenced by changes in the distance of the source area, depending on the water depth of the strait and nearby shelves owing to sea-level changes in tandem with glacial–interglacial cycles and geotectonic events.

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Oceanography of the East Sea (Japan Sea)

Cited by 54 publications

References 0 publications

Causes of Interannual Variation of Summer Mean Alongshore Current Near the East Coast of Korea Derived From 16‐Year‐Long Observational Data

Causes of Interannual Variation of Summer Mean Alongshore Current Near the East Coast of Korea Derived From 16‐Year‐Long Observational Data

Sedimentary Organic Carbon Budget Across the Slope to the Basin in the Southwestern Ulleung (Tsushima) Basin of the East (Japan) Sea

New findings on palynofacies characteristics of semi-enclosed deep-sea environments in the East Sea over 2 million years

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