• Fisheries and Aquatic Sciences
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• v.14 no.4
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• pp.421-428
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• 2011

We conducted modeling experiments to evaluate the residence times and exchange rates of seawater in Gamak Bay, located on the southern coast of the Korean Peninsula. The results revealed that pollutants are more quickly dispersed in a fixed grid rather than in a variable grid system. Pollutant concentrations decayed exponentially with time after release near the mouth of the bay, whereas no exponential variations were seen at the northwest end of the bay. The mean exchange rate of the seawater was 1.58% per day in the variable grid system, and the residence time of pollutants was greater than 288 days in Gamak Bay. Conversely, the exchange rate of seawater in Gamak Bay, as revealed by the particle tracking method, was 65% over a 50-day simulation. The results suggest that the seawater exchange in Gamak Bay is so low that pollutants are likely to remain in the bay indefinitely.

• Journal of Environmental Science International
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• v.8 no.6
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• pp.645-652
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• 1999

In order to simulate and investigate the major characteristics of El Nino/Southern Oscillation(ENSO) and Madden Jullian Oscillation(MJO), an intermediate type atmosphere-ocean coupled model is developed and their results are examined. The atmosphere model is a time-dependent non-linear perturbation moist model which can determine the internal heating for itself. The counterpart of the atmosphere model is GCM-type tropical ocean model which has fine horizontal and vertical grid resolutions. In the coupled experiment, warm SST anomaly and increased precipitation and eastward wind and current anomalies associated with ENSO and MJO are properly simulated in Pacific and Indian Oceans. In spite of some discrepancies in simulation MJO, the observed atmospheric and oceanic low-frequency characteristics in the tropics are successfully identified. Among them, positive SST anomalies centered at the 100m-depth of tropical eastern-central Pacific due to the eastward advection of warm water and reduced equatorial upwelling, and negative anomalies in the Indian and western Pacific seem to be the fundamental features of tropical low-frequency oscillations.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.242-243
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• 2001

Tsushima Warm Current(WD entering into the East Sea through the Korean Strait flows northeastward and during this travel it shows complicated movement like meandering and eddy. It is considered that these variations of TWC are important causes making water masses unstable and also have influence on biological and chemical properties of water masses. Lee and Cho(2000) suggested that meandering of TWC in adjacent waters of Noto peninsula has much influence on fluctuation of current structure. (omitted)

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.12 no.1
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• pp.19-24
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• 1976

A series of physical oceanographic investigations of the circulation in the Kwang Bay' were carried out seven times from May 1974 to May 1975 every other month. The average water transports through the southern entrance of the' Kwang Yang Bay were approximately $1,014{\times}I0^6m^3$/half-tide in ebb current and $278{\times}10^6m^3$$405.6{\times}I0^6m^34/half-tide in ebb current, and $282{\times}10^6m^3 $/half-tide in flood current, at the maximum current intensity. The water from Seomjin River flows into the bay at an annual average rate of $84{\times}I0^6m^3$/half-tide, the rate being fluctuated from month to month from $6.0\times}10^6m^3 $to $11. 5{\times}I0^6m^3 $per half-tide.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.12 no.2
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• pp.43-47
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• 1976

The large two-boat trawl is of importance in Korean fishery. It occupied 12.8% of total catches in 1974. The author analysed the reports of six large two-boat trawlers operated at the Yellow Sea and the East China Sea, in the term from September 1975 to March 1976. The results obtained are as follows; (1) 1,710 of total hauls are operated in the term, and the total catches amounted 559, 181kg. Then, 325kg of catch per unit effort (C. P. U. E) are obtained. The catches are specified into 28% of soles, 12% of shrimp, 8% of yellow corvenia, hair tail, kang-dari, and the rest of miscellanous fishes. (2) C. P. U. E. of the southern sectors of the Soheaksan Is. represented superior catches to compared with others sectors. (3) The monthly variation of C. P. U. E. between sea eel and yellow corvenia revealed positive correlation, whereas between sole and shlimp, between hair tail and rays revealed negative correlation respectively.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.12 no.2
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• pp.37-42
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• 1976

Each term of heat badget equation in the eastern Yellow Sea was calculated and the variation in relation to meteorological condition was shown for the period from September 1973 to February 1974, At Mal-do near Gunsan the maximum heat exchange occurred at the last ten days of December (--522 1y/day), while at Sunmi-do near Incheon it occurred at the middle ten days of November (--665 1y /day), The contribution of the sensible heat to total heat exchange increased rapidly, while the effect of cloudiness decreased to be negligible in winter. The values of the heat exchange fluctuated considerably with the periodic occurrence of the cold Siberiaa air mass. The mean evaporation heat estimated indirectly from the aerological data was 32 ly/day at the northern part and 269 ly/dlY at the southern part of the Yellow Sea in December 1973.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.27 no.4
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• pp.232-237
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• 1991

The elementary experiments were conducted in order to improve the quality of trap baits in the southern coastal waters of Korea. 16 kind of natural baits or 11 chemicals amino acids or neucleotides, used for experiments.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.50 no.3
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• pp.361-367
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• 2014

The aims of this study are to access the status and problems and draft possible solutions of Korean trawl fishery in New Zealand sea. The main target fish species for Korean trawlers in this sea were barracouta, blue mackerel, hake, hoki, jack mackerel, ling, oreo, orange roughy, southern blue whiting, spiny dogfish, squid and silver warehou. The Korean trawl fishery are suffering from a supply of seaman, continuous increasing coast of the counter partner, repair of vessel and seaman supply. It may be useful for getting over these difficulties to build a new trawler with a automatic operation system.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.5 no.4
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• pp.374-380
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• 2000

Dissolved aliphatic hydrocarbon concentrations in the surface seawater were investigated to describe their distribution and elucidate their sources in the Cheju-Korea Straits region (33$^{\circ}$30‘-34$^{\circ}$N 125$^{\circ}$-128$^{\circ}$E). Seawater sampling was made in spring and autumn in 1998. A large temporal and spatial variability were observed in the dissolved hydrocarbon concentrations in the region. The sources of dissolved hydrocarbons in seawater were elucidated based on the molecular concentrations of n-alkanes and pristane. Dissolved hydrocarbons in the surface water appears to be largely originated from phytoplankton and petroleum in the southern Yellow Sea (125$^{\circ}$), and terrigenous and petrogenic in the Cheju-Korea Straits region in April 1998. In September 1998, dissolved hydrocarbons in the surface waters were largely derived from phytoplanktons and terrestrial material in the Cheju-Korea Soaits region.

• Proceedings of KOSOMES biannual meeting
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• 2008.05a
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• pp.147-151
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• 2008

In Southern Sea of Korea, there are upwelling area where artificial seamount were built and the environment variations (temperature, salinity, nutrient and current) of before and after built seamount were observed between 2002 and 2007. In 2002, before the seamount was built, there had stratification at 20-30m. And in 2007, seamount was built, stratification of the seamount at the front and back of it were changed by 10-40 m and 20-30 m, respectively. To know the reason of this results, we used temperature and salinity using Brunt-Vaisala Frequency and horizontal current using vertical shear and relative vorticity. They showed upwelling was mainly reason that changed the ocean environment.