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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society of Oceanography
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Volume & Issues
Volume 1, Issue 2 - Oct 1996
Volume 1, Issue 1 - Apr 1996
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A Paleomagnetic Study of Deep-Sea Cores from the KODOS-90 Area in the North Pacific
The Sea, volume 1, issue 1, 1996, Pages 1~12
A paleomagnetic study was carried out on three gravity cores recovered from the KODOS-90 area in the North Pacific to obtain a magnetostratigraphic information and to correlate the magnetic records between cores. The sediments bear a stable remanent magnetization and the polarity sequence of the three cores can be correlated with the gomagnetic polarity time scale for the Plio-Pleistocene. The abrupt change in the magnetic susceptibility profile at 285 cm depth of the gravity core 26 indicates the presence of a major hiatus. The average sedimentation rates of the gravity cores 08 and 26 are about 2.7 and 1.4 times higher than that of the gravity core 20 (0.09 cm/100yr), respectively.
Toxicity Tests of Seawater on the Developmental Stages of Sea Urchin, Hemicentrotus pulcherrimus, in Ulsan Bay
The Sea, volume 1, issue 1, 1996, Pages 13~19
Toxicity of surface seawater in Ulsan Bay on a sea urchin, Hemicentrotus pulcherrimus was assessed to investigate the correlation between the concentrations of five heavy metals (Fe, Co, Cu, Cd, and Ni) and the impairments during the developmental stage of the sea urchin eggs. The tests during the six developmental stages of the eggs, are fertilization rate, cell 4, cell 4, polyspermic cleavage, permanent blastula and exogastrula. Highly positive correlations were found between the concentrations of Cu, Co and Ni and the toxicities on the eggs. Such tests will be useful as an indicator of seawater quality.
Paleomagnetic and Rock-Magnetic Studies of Piston Core Sediments at KODOS94, Northeast Pacific Ocean
The Sea, volume 1, issue 1, 1996, Pages 20~31
Paleomagnetic and rock-magnetic studies were carried out for pelagic clay cores obtained from the KODOS94 area in the Northeast Pacific Ocean. Paleomagnetic results show that the sediments bear a stable remanent magnetization and record both normal and reversal polarities. The sedimentation rates are estimated by correlating the polarities with the geomagnetic time scale: the upper part (Brunhes Normal Chron) of the cores range from 0.8 mm to 1.2 mm/10
3/ years and the lower part (below Brunhes-Matuyama boundary) are 0.97 mm to 1.55 mm/10
3/ years. Our results suggest that the age of the sediments is Pleistocene and late Pliocene. The magnetically unstable layer in the lower part of the cores was characterized by a decrease in the magnetic intensity and deterioration of the quality of NRM directional data with depth. These effects were probably caused by diagenetic processes in sediments with depth
Changes in Sedimentary Process and Distribution of Benthic Foraminifera in the Eastern Part of Kwangyang Bay, South Sea of Korea
The Sea, volume 1, issue 1, 1996, Pages 32~45
Analyses of surface sediment textures and recent benthic foraminifera were carried out to understand the change of sedimentary depositional processes in the eastern part of Kwangyang Bay. Echo-sounding images revealed that topographic change of the delta front sheet sand was caused by POSCO (Pohang Steel Company)'s dredging and reclaiming. The sand body prograded toward southeast. Fine sediments are distributed in the northeastern part of the study area. Identification of benthic foraminifera was conducted for the two selected cores from the sand body for the first time. Dominant species are Ammonia beccarii, Elphidium excavatum and Quinqueloculina lamarckiana. No abrupt change of benthic foraminiferal assemblage was observed from the sedimentary sequences.
Basic Marine Environmental Characteristics of Suspended Sediments in the Inner Shelf Zone off Tae-An Peninsula, West Coast of Korea
The Sea, volume 1, issue 1, 1996, Pages 46~54
A study on the concentrations of total suspended matters (TSM) and their distribution pattern was conducted off the west coast of Tae-An Peninsula during the spring season. Especially non-destructive and fine-tuned analysis for the size-distribution of suspended matters was made using SPECTREX instrument. Water masses were characterized by the typical tidal front, with vertically homogenous coastal waters and the strong thermoclines on the offshore area. Concentrations of suspended matters were generally less than 10 mg/l, but the concentrations increased up to 25 mg/l at the bottom waters and mid-depth waters. Mean particle size of the suspended matters were generally 5-6
for the fine-grained suspended matters and the coarse-grained suspended matters, respectively. They are considered to be composed dominantly of detrital materials. On the coastal area, landward side of tidal front, bottom sediments can be easily resuspended by the strong tidal currents, and therefore, deposition of suspended materials are thought to be rather limited. On the offshore area, however, suspended sediments mostly supplied from the northern part of the present study area near Kyunggi Bay are thought to be transported southward and/or southwestward along the mid- depth layer of strong thermocline.
Infection Status of Todarodes pacificus (Mollusca: Cephalopoda) with Anisakid Larvae in the Markets from Jumungin
The Sea, volume 1, issue 1, 1996, Pages 55~57
A total of 248 specimens of Todarodes pacificus were purchased from the Jumungin fishery market at the East Sea area two times during the period from November 1 to December 30, 1995. Samples were examined for their infection status with larvae anisakid. Anisakid larvae were collected from muscle, viscera and omentum. One hundred sixteen larval anisakids sorted from 34 specimens of T. pacificus (13.7% of infection rate) ranged from 13.5 to 29.5 mm in their body length. They were classified based on morphological and morphometric observations as follows; Anisakis type I larvae (68 larvae, 58.6%: positive rate), Contracaecum type A (5, 4.3%), Anisakis type II (17, 14.5%), Contracaecum type D (8, 7.0%) and unknown type (18, 15.5%).