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Journal of the Korean Society of Oceanography 6건

  1. [국내논문]   Modern Sedimentary Environment of Jinhae Bay, SE Korea  

    Park, Soo-Chul (Department of Oceanography, Chungnam National University ) , Lee, Kang-Wook (Department of Oceanography, Chungnam National University)
    Journal of the Korean Society of Oceanography v.31 no.2 ,pp. 43 - 54 , 1996 , 1225-1283 ,

    초록

    Jinhae Bay, one of the largest tidal bays on the southern coast of Korea, is an area with thick accumulations of recent, fine-grained sediments, mainly supplied from the Nakdong River. The preponderance of silt and clay particles reflects the large quantity of sediments transported in suspension. Although the clay mineral assemblage is similar to that derived from the nearby Nakdong River, relatively high concentration (3-9%) of smectite suggests some local input of fine particles from several streams around the bay or some contribution from the offshore water that may be influenced by the Tsushima Current. The content of organic matters in sediments is as high as 12%, and their C/N ratios imply that they are comprised of mixtures derived from marine plankton and terrestrial plants. $^{210}Pb$ excess activity profiles of sediment cores yield an average sedimentation rate (a 100-year time scale) of about 2-5 mm/yr, which coincides well with the long-term sedimentation rate (a 1000-year time scale) estimated from the sediment isopach map. On the basis of sediment bulk density and sedimentation rate, an annual sink of mud in the bay is estimated approximately 1.0 ${\times}$ $10^{6}$ tons per year.

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  2. [국내논문]   Distribution and Transport of Suspended Particulate Matter, Dissolved Oxygen and Major Inorganic Nutrients in the Cheju Strait  

    Suk, Moon-Sik (Korea Ocean Research & Development Institute ) , Hong, Gi-Hoon (Korea Ocean Research & Development Institute ) , Chung, Chang-Soo (Korea Ocean Research & Development Institute ) , Chang, Kyung-Il (Korea Ocean Research & Development Institute ) , Kang, Dong-Jin (Korea Ocean Research & Development Institute)
    Journal of the Korean Society of Oceanography v.31 no.2 ,pp. 55 - 63 , 1996 , 1225-1283 ,

    초록

    Distribution of suspended particulate matter, dissolved oxygen and major inorganic nutrients along a meridional section ( $126^{\circ}$ 33' E) in the Cheju Strait is described along with the hydrographic and current data obtained during April 25-27, 1995. The current measurements was conducted using a vessel-mounted Acoustic Doppler Current Profiler (ADCP). Repeated coverage along an ADCP transect during 25 hours allows to calculate the daily mean along- and cross-strait currents. Measured material concentrations and the mean current speed were used to estimate the flux density (cencentration times current speed) of materials. Two types of depth distibution of flux densities were observed. for nitrate and suspended particulate matter, the depth distribution pattern of materials determines those of flux densities. However, flow patterns determine those of flux densities for dissolved oxygen, phosphate and silicic acid. The total along-strait water volume transport is about 0.3 Sv (1Sv $10^{6}$ $m^{3}/s^{-1}$ ). The total along-strait material transports are estimated to be 3.1 $${\times} $10^{5}$ $g/s^{-1},$ 2.4 ${\times}$ $10^{6}\;g/s^{-1},$ 7.I ${\times}$ $10^{2}\;mol/s^{-1},$ 3.I ${\times}$ $10\;mol/s^{-1},$ 1.7 ${\times}$ $10^{3}\;mol/s^{-1}$ for suspended particulate matter, dissolved oxygen, nitrate ion, silicic acid and phosphate ion, respectively.

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  3. [국내논문]   Numerical Experiments of Ocean Acoustic Tomography in the East Sea of Korea  

    Han, Sang-Kyu (Dept. of Earth and Marine Sciences Hanyang University ) , Na, Jung-Yul (Dept. of Earth and Marine Sciences Hanyang University ) , Lee, Jae-Hak (Physical Oceanography Division, Korea Ocean Research and Development Institute)
    Journal of the Korean Society of Oceanography v.31 no.2 ,pp. 64 - 74 , 1996 , 1225-1283 ,

    초록

    Numerical experiments of OAT (Ocean Acoustic Tomography) are carried out in the East Sea of Korea where the canonical ocean has been perturbed by a mesoscale warm eddy and a thermal front. In order to estimate the horizontal and vertical structure of water temperature of the perturbed ocean, the experimental area is divided into 16 cells with 8 pairs of sources and receivers for a horizontal slice and the water column is divided into 8 layers for a vertical slice. The inversely estimated temperature field by using SVD (Singular Value Decomposition) method reveals the eddy and frontal structure clearly. The rms errors of the two horizontal slices are less than $0.4^{\circ}C$ and $1.7^{\circ}C$ at 400 m and 200 m depths, respectively, while the error in the vertical slice is less than $1.0^{\circ}C.$ For better estimation of temperature by OAT method, particularly for the East Sea, a range-dependent ray model should be used to solve the forward problem. At the same time, improvement in computing the refracted ray path between vertical layers is required to obtain more accurate travel time information. The results of the present experiment give rise to a possibility of application of OAT in remote sensing of the ocean thermal structure.

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  4. [국내논문]   The Analytic and Numerical Solutions of the 1$\frac{1}{2}$-layer and 2$\frac{1}{2}$-layer Models to the Strong Offshore Winds.  

    Lee, Hyong-Sun (Korea Naval Academy)
    Journal of the Korean Society of Oceanography v.31 no.2 ,pp. 75 - 88 , 1996 , 1225-1283 ,

    초록

    The analytic and numerical solution of the 1 $\frac{1}{2}$ -layer and 2 $\frac{1}{2}$ -layer models are derived. The large coastal-sea level drop and the fast westward speed of the anticyclonic gyre due to strong offshore winds using two ocean models are investigated. The models are forced by wind stress fields similar in structure to the intense mountain-pass jets( ${\sim}$ 20 dyne/ $cm^{2}$ ) that appear in the Gulfs of Tehuantepec and Papagayo in the Central America for periods of 3 ${\sim}$ 7 days. Analytic and numerical solutions compare favorably with observations, the large sea-level drop ( ${\sim}$ 30 cm) at the coast and the fast westward propagation speeds ( ${\sim}$ 13 km/day) of the gyres. The coastal sea-level drop is enhanced by several factors: horizontal mixing, enhanced forcing, coastal geometry, and the existence of a second active layer in the 2 $\frac{1}{2}$ -layer model. Horizontal mixing enhances the sea-level drop because the coastal boundary layer is actually narrower with mixing. The forcing ${\tau}$ /h is enhanced near the coast where h is thin. Especially, in analytic solutions to the 2 $\frac{1}{2}$ -layer model the presence of two baroclinic modes increases the sea-level drop to some degree. Of theses factors the strengthened forcing ${\tau}$ /h has the largest effect on the magnitude of the drop, and when all of them are included the resulting maximum drop is -30.0 cm, close to observed values. To investigate the processes that influence the propagation speeds of anticyclonic gyre, several test wind-forced calculations were carried out. Solutions to dynamically simpler versions of the 1 $\frac{1}{2}$ -layer model show that the speed is increased both by ${\beta}$ -induced self-advection and by larger h at the center ofthe gyres. Solutions to the 2 $\frac{1}{2}$ -layer model indicate that the lower-layer flow field advects the gyre westward and southward, significantly increasing their propagation speed. The Papagayo gyre propagates westward at a speed of 12.8 km/day, close to observed speeds.

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  5. [국내논문]   Comparison between Geostrophic Currents and Measured in the Southwestern Part of the East Sea   피인용횟수: 1

    Shin, Chang-Woong (Department of Oceanography, Inha University ) , Byun, Sang-Kyung (Korea Ocean Research and Development Institute ) , Kim, Cheol-Soo (Korea Ocean Research and Development Institute)
    Journal of the Korean Society of Oceanography v.31 no.2 ,pp. 89 - 96 , 1996 , 1225-1283 ,

    초록

    A comparative study between geostrophic currents and directly measured currents was conducted for the upper layer to 200 m depth by using data from eleven observations of CTD and ADCP between March 1992 and November 1993 in the southwestern part of the East Sea. First-order linear relationship was found between calculated geostrophic currents and measured currents with the correlation coefficient of 0.83. On the average, 68.7% of directly measured current can be explained by geostrophic current obtained by dynamic method. The correlation coeflicients increased with total geostrophic transport, which suggests that geostrophic balance is good in areas of strong current.

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  6. [국내논문]   A Review on the Radioisotopic Methods for Measuring Bacterial Production in Aquatic Environments  

    Hyun, Jung-Ho (Deep Seabed Exploration Programme, Korea Ocean Research and Development Institute ) , Larock, Paul A. (Department of Oceanography and Coastal Sciences, Louisiana State University)
    Journal of the Korean Society of Oceanography v.31 no.2 ,pp. 97 - 106 , 1996 , 1225-1283 ,

    초록

    Advantages and disadvantages of four radioisotopic methods, $^{3}H$ -thymidine, $^{3}H$ -adenine, $^{3}H$ -leucine, and $^{35}S$ -sulfate, for measuring bacterial production were reviewed. The maior issues discussed in production methods were: (1) whether all the actively growing bacteria take up the radiolabeled (organic) tracers; (2) how each target molecule should be purified (nonspecific labeling); and (3) how important the determination of the precursor pool specific activity is (internal isotope dilution). Since all the radioisotoic methods have their own advantages and disadvantages, careful consideration must be paid in choosing the radioisotope according to the conditions of each environment investigated.

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