• Title/Summary/Keyword: East Sea

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A Circulation Study of the East Sea Using Satellite-Tracked Drifters 1 : Tsushima Current

  • LEE Dong-Kyu;LEE Jae-Chul;LEE Sang-Ryong;LIE Heung-Jae
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.30 no.6
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    • pp.1021-1032
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    • 1997
  • Satellite-tracked drifters deployed in the East Sea since 1991 are used to study the Tsushima Current (TC). It is found that the TC is a steady current with a mean speed of 10 cm/s before it enters the East Sea. Only during the summer, the TC flows along Honshu Island with a mean speed of $30\~40\;cm/s$ and then exits through the Tsugaru Strait. In fall and winter, the TC does not follow the coast along Honshu Island but it enters into the interior of the East Sea before it reaches the Tsugaru Strait. The water that passes the West Channel of the Korea Strait mostly comes from the western East China Sea and spreads into the interior of the East Sea. It also forms the large eddies in the southern East Sea. The outflow through the Tsugaru Strait comes from the interior of the East Sea in all seasons except summer. The mean speed of the Tsugaru Strait outflow is about 60 cm/s. The largest current variability is found in the eastern central area of the East Sea, south of sub-polar front.

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Two Hippolytid Shrimps (Crustacea: Decapoda: Caridea) from the Deepwater of the East Sea, Korea

  • Kim, Jung-Nyun;Choi, Jung-Hwa;Hong, Byeong-Gyu;Hwang, Kang-Seok;Chun, Young-Yull
    • Animal Systematics, Evolution and Diversity
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    • v.23 no.2
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    • pp.199-203
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    • 2007
  • Two hippolytid shrimps, Spirontocaris spinus (Sowerby, 1805) and Lebbeus unalaskensis (Rathbun, 1902) are described on the basis of material collected from the deepwater of the East Sea, Korea at 310-810 m. The former has been incorrectly known as Spirontocaris arcuata Rathbun, 1902 in Korea and the latter is a new member of the Korean fauna. Morphological and distributional accounts of these species are presented with illustrations.

Interannual Variability of Common Squid Fishing Ground in the East Sea derived from Satellite and In-situ Data

  • Kim, Sang-Woo;Ahn, Ji-Suk;Lim, Jin-Wook;Jeong, Hee-Dong;Park, Jong-Hwa
    • Journal of Environmental Science International
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    • v.22 no.10
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    • pp.1363-1371
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    • 2013
  • In this study, we estimate the interannual spatial and temporal distributions of fishing grounds at night in the East Sea based on satellite and in-situ data. We observe that the $15^{\circ}C$ thermal front moves in the north-south direction according to the movement of the warm water (above $18^{\circ}C$) in the Tsushima Warm Current (TWC) area, forcing the cold water area (below $10^{\circ}C$) to either expand or shrink. The interannual variations of sea surface temperature (SST) in winter represented by the indicator SST of $6^{\circ}C$ are consistent with the east-west zonal areas in the central East Sea which represented over $1^{\circ}C$ standard deviation of SST in February during 1990-2000. Annual SST in the fishing grounds of common squid fishing vessels, observed both by fishing vessels and satellites range from 9-$22^{\circ}C$, with the satellite-observed data having a larger range than the fishing vessel-based ones. The interannual distributions of the common squid fishing grounds in the East Sea are mostly concentrated in the TWC area in the southwestern part of the East Sea and in the coast of southern Honshu and Hokkaido in Japan. The interannual distributions of the nighttime fishing vessels are consistent with the catches investigated from the fishing vessel.

Variability of Surface Chlorophyll Concentration in the Northwest Pacific Ocean (북서태평양의 표층엽록소 변동성)

  • Park, Ji-Soo;Suk, Moon-Sik;Yoon, Suk;Yoo, Sin-Jae
    • Ocean and Polar Research
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    • v.30 no.3
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    • pp.277-287
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    • 2008
  • We collected information on seasonal and interannual variability of surface chlorophyll a concentration between 1997-2007 from the Northwest Pacific Ocean. Satellite data were used to acquire chlorophyll a and sea surface temperature from six regions: East Sea/Ulleung Basin, East China Sea, Philippin Sea, Warm Pool region, Warm Pool North region, and Warm Pool East region. Mixed layer depth (MLD) was calculated from temperature profiles of ARGO floats data in four of the six regions during 2002-2007. In the East Sea/Ulleung Basin, seasonal variability of chlorophyll a concentration was attributed to seasonal change of MLD, while there was no significant relationship between chlorophyll a concentration and MLD in the Warm Pool region. Interannual anomaly in sea surface temperature were similar among the East Sea, East China Sea, Philippin Sea, and Warm Pool North region. The anomaly pattern was reversed in the Warm Pool East region. However, the anomaly pattern in the Warm Pool region was intermediate of the two patterns. In relation to chlorophyll a, there was a reversed interannual anomaly pattern between Warm Pool North and Warm Pool East, while the anomaly pattern in the Warm Pool region was similar to that of Warm Pool North except for the El $Ni\tilde{n}o$ years (1997/1998, 2002/2003, 2006/2007). However, there was no distinct relationship among other seas. Interestingly, in the Warm Pool and Warm Pool East regions, sea surface temperature showed a pronounced inverse pattern with chlorophyll a. This indicates a strong interrelationship among sea surface temperature-MLD-chlorophyll a in the regions. In the Warm Pool and Warm Pool East, zonal distribution of chlorophyll a concentration within the past 10 years has shown a good relationship with sea surface temperature which reflects ENSO variability.

Ichthyofaunistic Biogeography of the East Sea: Comparison between Benthic and Pelagic Zonalities

  • Kafanov, Alexander I.;Volvenko, Igor V.;Pitruk, Dmitry L.
    • Ocean and Polar Research
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    • v.23 no.1
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    • pp.35-49
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    • 2001
  • An ichthyofauna analysis of the East Sea using quantitative investigation procedures for latitudinal variations of the species richness and clustering of the species list is presented to illustrate the application of the adopted geographical scaling (less than 1:10,000,000) which provides a principal opportunity for common benthic and pelagic biogeographical zonation. The distribution of both pelagic and benthic marine fish biota at a scale of biosphere (or its major sections) was highly influenced by spatial nonuniformity of hydrological structure associated with the various water circulations and frontal zones. Following zoogeographical zonations were established for the East Sea: Osaka, East Korea, Primorye, North Primorye, Northern East Sea, Uetsu, Tsugaru, Soya and West Sakhalin.

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A Comparative Analysis of Cataloging Records Related to East Sea in the National Libraries of the Various Countries (세계 각국의 국가도서관에 있어 동해관련 목록레코드 비교 분석)

  • Kim, Jeong-Hyen
    • Journal of Korean Library and Information Science Society
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    • v.50 no.4
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    • pp.57-76
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    • 2019
  • Based on the analysis of the appellation from a historical perspective and the diversity of the notation East Sea, this study was conducted to analyze the characteristics of cataloging records related to East Sea in 54 national libraries of the each country. The results are as follows. To begin with, while most of the East Sea-related records are concentrated in some specific national libraries such as the United States, Russia, and the Japan, there are five libraries that do not have one. Second, the title keyword of East Sea-related records was 67.9% for 'Sea of Japan', 29.6% for 'East Sea', and 2.5% for these terms shown together in the national libraries of each country. Third, the subject heading of East Sea-related records was 86.9% for 'Sea of Japan' or 'Sea of Japan(geographic name)', 1.2% for 'East Sea', and 11.9% for general subject heading or blank.

A Review of Ocean Circulation of the East/Japan Sea (한국 동해 해수순환의 개략적 고찰)

  • 김종규
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.10a
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    • pp.103-107
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    • 2001
  • The major studies of an ocean circulation of the East/Japan Sea related to evaluate the feasibility and utilization of deep ocean water are reviewed. The major feature of surface current system of the East/Japan Sea is an inflow of the Tsushima Warm Current through the Korea/Tsushima Strait and the outflow through the Tsugaru and Soya Straits. The Tsushima Warm Current has been known to split into two or three branches in the southern region of the East/Japan Sea. In the cold water region of the East/Japan Sea, the North Korean Cold Current turns to the east near 39$^{\circ}$N after meeting the East Korean Warm Current, then flows eastward. The degree of penetration depends on the strength of the positive wind stress curl, according to the ventilation theory. Various current meter moorings indicate strong and oscillatory deep currents in various parts of the basin. According to some numerical experiments, these currents may be induced by pressure-topography or eddy-topography interaction. However, more investigations are needed to explain clearly the presence of these strong bottom currents. This study concludes the importance of topographical coupling, isopycnal outcropping, different wind forcing and the branching of the Tsushima Warm Current on the circulation of the East/Japan Sea.

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Structure of the Western East Sea Ecosystem

  • Zhang, Chang-Ik;Yoon, Sang-Cheol
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2002.10a
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    • pp.273-274
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    • 2002
  • In this study, we studied the structure of the western East Sea ecosystem and ecotrophic relationships among species inhabited at the East Sea using Ecopath (Christensen and Pauly, 1992) program. And in order to examine how the Climatic Regime Shift (CRS) affected to the western East Sea ecosystem, we analyzed the structure of the western East Sea ecosystem dividing before and after 1976/1977 CRS. (omitted)

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A New Record of Stephanasterias albula (Asteroidea: Forcipulatida: Asteriidae) from the East Sea, Korea

  • Lee, Taek-Jun;Shin, Sook
    • Animal Systematics, Evolution and Diversity
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    • v.26 no.3
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    • pp.345-347
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    • 2010
  • A sea star was collected with fishing nets at a depth of approximately 100-160 m in the East Sea and was identified as Stephanasterias albula (Stimpson, 1853) belonging to the family Asteriidae of the order Forcipulatida. This species characterized by having the capability of asexual reproduction by self-division turned out to be new to the Korean fauna. Its morphological characteristics are redescribed with illustrations. Thirty one species of sea stars including S. albula are now recorded from the East Sea of Korea.