• 제목/요약/키워드: East Sea

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동해 지리적 범위 사용 사례 및 정립 필요성 (Institutional definition instances and necessity of establishment about the geographical scope of the East Sea)

  • 김윤배;김구
    • 수산해양교육연구
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    • v.27 no.5
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    • pp.1380-1394
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    • 2015
  • This paper deals with the geographical scope of the East Sea introduced by major domestic institutions. The East Sea surrounded by South Korea, North Korea, Russia, Japan has a variety of marine resources, and is the very appropriate natural laboratory to study future global changes as a miniature ocean. However, there is a continuous conflict between Korea and Japan over the name of the East Sea because of the nature of international waters. So we need the active research achievements based on the exact geographic knowledge of the East Sea to promote the legitimacy of the East Sea in the international community. Nevertheless each domestic institution has a different way to define the southern border of the East Sea so that it showed a difference about linear distance of up to about 44 km. Also, they have defined the scope of East Sea not as the entire East Sea surrounded by South Korea, North Korea, Russia and Japan but as the jurisdiction of the Republic of Korea. It caused serious confusion about accurate statistical knowledge about East Sea such as area, volume, and mean water depth. Therefore, clear social consensus about the geographical scope of the East Sea would be required, there is also the need to institutionalize a legal order to spread it.

Aquarius 염분 관측 위성에 의한 동해 저염수의 형성과 유동 연구 (Formation and Distribution of Low Salinity Water in East Sea Observed from the Aquarius Satellite)

  • 이동규
    • 한국수산과학회지
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    • v.51 no.2
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    • pp.187-198
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    • 2018
  • The monthly salinity maps from Aquarius satellite covering the entire East Sea were produced to analyze the low-salinity water appearing in fall every year. The low-salinity water in the northern East Sea began to appear in May-June, spreading southward along the coast and eastward north of the subpolar front. Low-salinity water from the East China Sea entered the East Sea through the Korea Strait from July to September and was mixed with low-salinity water from the northern East Sea in the Ulleung Basin. The strength of the low-salinity water from the East China Sea was dependent on the strength of the southerly wind of the East China Sea in July-August. The salinity reaches a minimum in September with a distribution parallel to the latitude of $37.5^{\circ}N$. In October, low salinity water is distributed along the mean current path and subpolar front and the entire East Sea is covered with the low salinity water in November. Water with salinity larger than 34 psu starts to flow into the East Sea through the Korea Strait in December and it expands gradually northward up to the subpolar front in January- February.

국내 대표 해양·수산 과학논문 분석을 통한 우리나라 주변 바다 이름표기에 대한 제언 (Nomenclature of the Seas Around the Korean Peninsula Derived From Analyses of Papers in Two Representative Korean Ocean and Fisheries Science Journals: Present Status and Future)

  • 변도성;최병주
    • 한국해양학회지:바다
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    • v.23 no.3
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    • pp.125-151
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    • 2018
  • 지난 20년간(1998-2017년) 한국해양학회지(바다)와 한국수산과학회지에 실린 한글 논문 중 우리나라 주변 바다 이름을 지도에 표기한 논문들을 대상으로 그 표기 방법을 살펴보았다. 지도에 표기된 바다 명칭들의 형태는 크게 세 가지 - 'East Sea(동해)와 Yellow Sea(황해)', 'East Sea(동해), Yellow Sea(황해), South Sea(남해)', 'East Sea(동해), West Sea(서해), South Sea(남해)' - 가 있다. 'East Sea'는 모든 논문에서 'East Sea'로 표기된 반면, 'Yellow Sea'는 'West Sea'와 혼용해서 사용되고 있었다. 'Korea Strait(대한해협)' 대신 'South Sea'의 사용 빈도도 높았다. 이 결과는 연구자들이 해안선으로부터 가까운 연안해역을 우리나라를 기준으로 지리적 방위에 근간하여 부를 때 사용하는 바다 명칭과 주변해에 대한 국제적인 바다 명칭을 혼용하여 사용하고 있음을 보여 준다. 따라서 우리나라 해양 수산 연구자들이 바다 이름표기에 관한 기준을 세우고 일관성 있게 표기하는 것이 시급하다. 이와 관련하여 이 연구에서는 연구논문 작성 시에 주변해와 우리나라 연안해역에 대한 바다 명칭을 서로 구분하여 사용할 것을 제안하였다. 즉, 주변해는 국제적으로 통용되고 있는 'East Sea(동해)', 'Yellow Sea(황해)', 'Korea Strait(대한해협)', 'East China Sea(동중국해)'로 사용하고, 이들 주변 바다에 포함되어 있는 연안해역은 우리나라를 기준으로 상대적 방위에 근거한 'Coastal Sea off the East Coast of Korea(한국 동쪽 연안 바다)', 'Coastal Sea off the West Coast of Korea(한국 서쪽 연안 바다)', 'Coastal Sea off the South Coast of Korea(한국 남쪽 연안 바다)' 등으로 표현할 수 있다. 다른 표현으로는 'East Korea Coastal Zone', 'South Coastal Zone of Korea', 'West Korea Coastal Zone'으로도 표현할 수 있다. 작은 규모의 특정 해역의 경우 해양지명(해상지명과 해저지명)을 사용하여 연구해역을 표기할 수 있다.

동해에서 쓰시마난류의 변동과 관련한 극전선의 공간적 변화 (Spatial Variation of the Polar Front in relation to the Tsushima Warm Current in the East Sea)

  • 이충일;조규대;최용규
    • 한국환경과학회지
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    • v.12 no.9
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    • pp.943-948
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    • 2003
  • Variation of the polar front in the East Sea is studied using temperature and dissolved oxygen data obtained from Japan Meteorological Agency from 1972 to 1999. Variation of the polar front in the East Sea has a close relation to the variation of the Tsushima Warm Current (TWC). When the TWC spreads widely in the East Sea, polar front moves northward. The spatial variation of the polar front is greater in the southwestern area of the East Sea and the northern area of Tsugaru Strait where the variation of the TWC's distribution area is greater than those in others of the East Sea. Hence, in the southeastern area of the East Sea, that is, between near Noto peninsula and Tsugaru Strait, the spatial variation of the polar front is not so wide as in the southwestern area because the flow of TWC is stable.

국제 학술지에 발표된 연구 논문에서 동해의 표기 현황 (Status of Naming the East Sea in International Scientific Journals)

  • 강동진;임병호;장소영;김윤배;김경렬
    • Ocean and Polar Research
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    • v.31 no.1
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    • pp.133-156
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    • 2009
  • We have named the sea surrounded by the Korean Peninsula, Primorye of Russia, and Japanese Islands as the East Sea. Historically this region has been variously named the East Sea, Chosun Sea, and, more recently, Japan Sea and Sea of Japan. Since the scientific research papers can play important roles on the naming the sea, the status of naming the East Sea in international scientific journals was investigated. Among 472 papers in 46 international journals that we assessed, Japan Sea (or Sea of Japan) was used in 322 papers (68.2%), East Sea was used in 21 papers (4.4%), and parallel usage of East Sea and Japan Sea accounted for 27.3% (129 papers). In all scientific papers before the early 1980s, East Sea was not used. Since the first parallel usage of East Sea and Japan Sea in 1985, these designations has been increasingly used. After 2004, the parallel usage has replaced the single designation of Japan Sea.

어군의 음향학적 형태 및 분포특성과 어종식별에 관한 연구 1.한국 연근해 멸치어군의 형태 및 분포특성과 종식별 실험 (Study on the Acoustic Behaviour Pattern of Fish Shool and Species Identification 1. Shoal Behaviour pattern of anchovy (Engraulis japonicus) in Korean waters and Species Identification Test.)

  • 김장근
    • 수산해양기술연구
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    • v.34 no.1
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    • pp.52-61
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    • 1998
  • We studied behaviour pattern of anchovy (Engraulis japonicus) shoal by a method of shoal echo integration and tested species identification by a method of artificial neural network using the acoustic data collected in the East China Sea in March 1994 and in the southern coastal waters of the East Sea of Korea in March 1995. Between areas, frequency distribution of 10 shoal descriptors was different, which showed characteristics of shoal behaviour in size, bathymetric position and acoustic strength. The range and mean of shoal size distribution in length and height was wider and bigger in the southern coastal waters of the East Sea than in the East China Sea. Relative shoal size of China Sea. Fractal dimension of shoal was almost same in both areas. Mean volume reverbration index of shoal was 3 dB higher in the southern coastal waters of the East Sea than in the East China Sea. The depth layer of shoal distribution was related to bottom depth in the southern coastal waters of the East Sea, while it was between near surface and central layer in the East China Sea. Principal component analysis of shoal descriptors showed the correlation between shoal size and acoustic strength which was higher in the southern coastal waters of the East Sea, than in the East China Sea. Correlation was also found among the bathymetric positions of shoal to some degree higher in the southern coastal waters of the East Sea than in the East China Sea. The anchovy shoal of two areas was identified by artificial neural network. The contribution factor index (Cio) of the shoal descriptors between two areas were almost identical feature. The shoal volume reverberation index (Rv) was showed the highest contribution to the species identification, while shoal length and shoal height showed relatively high negative contribution to the species identification.

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러시아측 동해 북서부 해역과 한국측 동해 남서부 해역 트롤 조사에 어획된 어류의 종조성 및 양적변동 (Variations in species composition of fishes caught by trawl survey in the northwestern East Sea of Russian EEZ and southwestern East Sea of Korean EEZ)

  • 손명호;윤상철;이성일;윤병선;차형기;김종빈
    • 수산해양기술연구
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    • v.51 no.3
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    • pp.355-369
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    • 2015
  • To examine species composition, abundance and biomass of fishes in the northwestern East Sea of Russian EEZ, trawl survey were conducted at 31 sampling stations from 2006 to 2008. Also, trawl survey were conducted at 21 sampling stations in the southwestern East Sea of Korean EEZ from 2006 to 2008. A total of 67 fishes were collected in the northwestern East Sea of Russian EEZ, a total of 39 fishes were collected in the southwestern East Sea of Korean EEZ. Among them, a total of 53 fishes were collected in the northwestern East Sea of Russian EEZ only, and a total of 25 fishes were collected in the southwestern East Sea of Korean EEZ only. Mean abundance per area which caught by trawl survey in the northwestern East Sea ranged from a high of $116,478inds./km^2$ in 2008 to a low of $19,737inds./km^2$ in 2006. And mean abundance per area in the southwestern East Sea ranged from a high of $89,129inds./km^2$ in 2006 to a low of $8,234inds./km^2$ in 2008. Mean biomass per area which caught by trawl survey in the northwestern East Sea ranged from a high of $11,333kg/km^2$ in 2008 to a low of $2,439kg/km^2$ in 2006. And mean biomass per area in the southwestern East Sea ranged from a high of $6,273kg/km^2$ in 2006 to a low of $1,062 kg/km^2$ in 2008. Cluster analysis, based on a Bray-Curtis similarity matrix of fourth root transformed data of number of species and individuals per area, showed division into three different groups by depth in the northwestern and southwestern East Sea.

Paleo-Tsushima Water influx to the East Sea during the lowest sea level of the late Quaternary

  • Lee, Eun-Il
    • 한국지구과학회지
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    • v.26 no.7
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    • pp.714-724
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    • 2005
  • The East Sea, a semi-enclosed marginal sea with shallow straits in the northwest Pacific, is marked by the nearly geographic isolation and the low sea surface salinity during the last glacial maximum (LGM). The East Sea might have the only connection to the open ocean through the Korea Strait with a sill depth of 130 m, allowing the paleo-Tsushima Water to enter the sea during the LGM. The low paleosalinity associated with abnormally light $\delta^{18}O$ values of planktonic foraminifera is interpreted to have resulted from river discharge and precipitation. Nevertheless, two LGM features in the East Sea are disputable. This study attempts to estimate volume transport of the paleo-Tsushima Water via the Korea Strait and further examines its effect on the low sea surface salinity (SSS) during the lowest sea level of the LGM. The East Sea was not completely isolated, but partially linked to the northern East China Sea through the Korea Strait during the LGM. The volume transport of the paleo-Tsushima Water during the LGM is calculated approximately$(0.5\~2.1)\times10^{12}m^3/yr$ on the basis of the selected seismic reflection profiles along with bathymetry and current data. The annual influx of the paleo-Tsushima Water is low, compared to the 100 m-thick surface water volume $(about\;79.75\times10^{12}m^3)$ in the East Sea. The paleo-Tsushima Water influx might have changed the surface water properties within a geologically short time, potentially decreasing sea surface salinity. However, the effect of volume transport on the low sea surface salinity essentially depends on freshwater amounts within the paleo-Tsushima Water and excessive evaporation during the glacial lowstands of sea level. Even though the paleo-Tsushima Water is assumed to have been entirely freshwater at that time period, it would annually reduce only about 1‰ of salinity in the surface water of the East Sea. Thus, the paleo-Tsushima Water influx itself might not be large enough to significantly reduce the paleosalinity of about 100 m-thick surface layer during the LGM. This further suggests contribution of additional river discharges from nearby fluvial systems (e.g. the Amur River) to freshen the surface water.

동해 중부연안 벌레문치(Lycodes tanakae)의 성숙과 산란 (Maturity and Spawning of Lycodes tanakae in the Coastal Waters of the Middle East Sea)

  • 손명호;윤병선;박정호;최영민;이재봉;이해원;차형기;양재형
    • 한국수산과학회지
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    • v.47 no.3
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    • pp.255-263
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    • 2014
  • We investigated the reproductive characteristics of Lycodes tanakae in the coastal waters of the middle East Sea to elucidate the species' population structure. We investigated Lycodes tanakae maturation and spawning based on samples collected by Danish seine and gill nets from January 2012 to December 2013. We analyzed monthly changes in maturity stage, gonadosomatic index (GSI), egg diameter, fecundity, and total length at 50% group maturity. The spawning period was December to February, while fecundity ranged from 1,677 eggs at 57.3 cm (total length;TL) to 6,445 eggs at 75.7 cm. The relationship between TL and fecundity (F) was $F_e=6E-05TL^{3.127}$ ($R^2$ = 0.516), and F increased with increasing TL. We estimated the TL at 50% group maturity as 60.4 cm for females and 59.8 cm for males. This study is the first report of Lycodes tanakae reproductive characteristics in the coastal waters of the middle East Sea.

Shallow Water Tides in the Seas around Korea

  • Kantha, Lakshmi H.;Bang, In-Kweon;Choi, Jei-Kook;Suk, Moon-Sik
    • Journal of the korean society of oceanography
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    • v.31 no.3
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    • pp.123-133
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    • 1996
  • We describe here the shallow water tides in the seas around Korea, obtained from a nonlinear barotropic model of tides in a domain encompassing the Yellow Sea, the East China Sea and the East Sea (Sea of Japan). As expected, the shallow water tides are large in the shallow marginal areas around the Yellow Sea, with the M4 tide reaching amplitudes as high as 10 cm near the Korean coast, and quite small in the East Sea. However, we also find that the regions east of the Yangtze River ($126^{\circ}E,$ $30^{\circ}N$) in the East China Sea also sustain large shallow water tides, with $M_{4}$, amplitudes reaching 5 cm. Such large shallow water tides are an important component of altimeter-measured sea levels and should not be ignored in any altimetric analyses of the Yellow Sea and the East China Sea. This study also highlights the desirability of very high resolution models to derive accurate shallow water tides in coastal regions.

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