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한국해양학회> OCEANOGRAPHY

OCEANOGRAPHY

Journal of the Korean Society of Oceanography

  • : 한국해양학회
  • : 수해양분야  >  해양학
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  • : 연속간행물
  • : 계간
  • : 1225-1283
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수록정보
39권4호(2004) |수록논문 수 : 5
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39권4호(2004년) 수록논문
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1Articles : Ecosystem Consequences of an Anomalously High Zooplankton Biomass in the South Sea of Korea

저자 : Young Shil Kang , Ginger A. Rebstock

발행기관 : 한국해양학회 간행물 : OCEANOGRAPHY 39권 4호 발행 연도 : 2004 페이지 : pp. 207-211 (5 pages)

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We used long time series of hydrographic and biological variables to examine the ecosystem consequences of a rare, anomalous event in the south sea of Korea. The highest zooplankton biomass in 36 years of sampling occurred in April 1997. Zooplankton biomass exceeded 2 times than the long-term mean at 35% of the stations. Copepod abundance was low in April and June and also failed to show a seasonal peak in 1997. Mackerel (Scomber japonicus) catches were very low in spring 1997 and 1999, in spite of a positive correlation between zooplankton biomass and mackerel catches at lags of 0, 12 and 24 months. It was discussed that a high zooplankton biomass with low copepod abundance in April 1997 resulted from unusual high temperature and salps abundance. Water temperatures were ca. 2℃ higher than the long-term mean at the surface. Salps and doliolids (thaliaceans), especially the warm-water species Doliolum nationalis, dominated the zooplankton. An unusual incursion of the Tsushima Warm Current may have transported the thaliaceans into the area and/or produced favorable conditions for a bloom. This study suggested that taxonomic composition of zooplankton was important to decide mackerel catches.

2Articles : Distribution of Suspended Particulate Matters in the East China Sea, Southern Yellow Sea and South Sea of Korea During the Winter Season

저자 : Jin Yong Choi , Seok Yun Kim , Hyo Jin Kang

발행기관 : 한국해양학회 간행물 : OCEANOGRAPHY 39권 4호 발행 연도 : 2004 페이지 : pp. 212-221 (10 pages)

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Concentrations of suspended particulate matters (SPM) and their distribution patterns were monitored three times in the East China Sea during the winter season in 1998 and 1999. SPM concentrations showed significant temporal variations controlled by the atmospheric conditions and sea states. In coastal area, SPM values were about 10-20 mg/l in fair weather conditions, but exceeded 100 mg/l during the storm periods. Turbid waters were distributed widespread in the continental shelf of the East China Sea and the coastal area of the Korean Peninsula, and these two areas were connected along a NE-SW direction. The distribution patterns of turbid waters were interpreted as representing the transport behavior of suspended matter. Although the primary source of inner shelf mud deposits of Korea seems to be the Korean Peninsula, contribution from the East China Sea to the coastal area of Korea increases especially during the winter season.

3Articles : Comparison of a Microbiological Model Simulation with Microcosm Data

저자 : Jae Young Lee , Paul Tett , Ken Jones

발행기관 : 한국해양학회 간행물 : OCEANOGRAPHY 39권 4호 발행 연도 : 2004 페이지 : pp. 222-233 (12 pages)

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Using nitrogen as the limiting nutrient, the default version of a microplankton-detritus model linked chlorophyll concentration to the autotroph nitrogen. However, phosphorus dynamics were added to simulate the results of a microcosm experiment. Using standard parameter values with a single value of microheterotroph fraction in the microplankton taken from the observed range, the best simulation successfully captured the main features of the time-courses of chlorophyll and particulate organic carbon, nitrogen and phosphorus, with root-mean-square error equivalent to 29% of particulate concentration. A standard version of microbiological model assumes complete internal cycling of nutrient elements; adding a term for ammonium and phosphate excretion by microheterotrophs did not significantly improve predictions. Relaxing the requirement for constant microheterotroph fraction resulted in an autotroph-heterotroph model AH, with dynamics resembling those of a Lotka-Volterra predator-prey system. AH fitted the microcosm data worse than did MP, justifying the suppression of Lotka-Volterra dynamics in MP. The paper concludes with a discussion of possible reasons for the success of the simple bulk dynamics of MP in simulating microplankton behaviour.

4Articles : Analysis on the Pigment Composition of Phytoplankton Assemblages using HPLC (High Performance Liquid Chromatography) in the Adjacent Waters of Nuclear Power Plants in Spring

저자 : Hyu Chang Choi , Yeon Shik Kang , Joong Ki Choi , Tae Yoon Song , Man Ho Yoo

발행기관 : 한국해양학회 간행물 : OCEANOGRAPHY 39권 4호 발행 연도 : 2004 페이지 : pp. 234-242 (9 pages)

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The pigment composition and concentration of phytoplankton assemblages using HPLC in the adjacent waters of four nuclear power plants (Yonggwang, Kori, Wolsong and Ulchin) were investigated during the spring blooming in 2004. The mean concentration of chlorophyll a ranged from 563.8 to 2,949.0 ng l-1, with the lowest concentration at Kori and the highest concentration at Wolsong. Among the carotenoids, the amounts of fucoxanthin and chlorophyll c2 were relatively higher than those of other pigments in the study site. As minor pigments, zeaxanthin, chlorophyll b, 19`-butanoyloxyfucoxanthin, diadinoxanthin, 19'-hexanoyloxyfucoxanthin, chlorophyll c3 and peridinin were detected. The results of pigment composition and concentration showed that diatoms had an important proportion of phytoplankton community when a spring bloom occurred. Cyanobacteria was present relatively low density at the Wolsong and the green alga such as chlorophytes and prasinophytes were abundant at the Yonggwang and Kori, while dinoflagellates characterized by peridinin were common at Ulchin and Kori. The pigment composition and concentration of phytoplankton after passing through the cooling-water system of nuclear power plant were highly variable. No distinct trend of the change of each pigment composition and amount was detected but the variation of fucoxanthin and chlorophyll c2 highly coupled with that of chlorophyll a. We pointed out that the diatom controlled the overall variation of phytoplankton biomass during the spring season.

5Articles : Influence of AVS on the Partitioning of Bioavailable Zn to Various Binding Phases in Sediments

저자 : Ki Hoon Song , Vincent T. Breslin

발행기관 : 한국해양학회 간행물 : OCEANOGRAPHY 39권 4호 발행 연도 : 2004 페이지 : pp. 243-250 (8 pages)

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Sediment microcosm experiments were conducted for 14 and 28 days using Zn spiked sediment to examine the changing distribution of bioavailable sediment-bound Zn at different SEM (simultaneously extracted metal)-Zn/ AVS (acid volatile sulfide) mole ratios as a function of time and amphipod density. In surficial sediments (0-1 cm), AVS concentrations significantly decreased due to bioturbation and oxidation, while SEM-Zn concentrations remained unchanged. As a result, SEM-Zn/AVS ratios in the surface sediment were greater one although the ratios were designed as less than one initially. With increasing SEM-Zn/AVS ratios in surficial sediments, concentrations of potentially bioavailable MgCl2 extractable-Zn, NaOAc extractable-Zn and pore water-Zn significantly increased, while concentrations of SEM-Zn were not significantly varied. Results suggested that as AVS concentrations decreased, AVS bound Zn was partitioned to other sediment fractions (i.e. MgCl2 and NaOAc extractable) and the pore water, resulting in changes in Zn bioavailability in surficial sediments. Concentrations of AVS, SEM-Zn and pore water-Zn remained unchanged in the deeper layers (>1 cm) of the sediment.

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