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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Ocean and Polar Research
Journal Basic Information
Journal DOI :
Korea Institute of Ocean Science & Technology
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Volume & Issues
Volume 30, Issue 4 - Dec 2008
Volume 30, Issue 3 - Sep 2008
Volume 30, Issue 2 - Jun 2008
Volume 30, Issue 1 - Mar 2008
Selecting the target year
Implementation of the Ensemble Kalman Filter to a Double Gyre Ocean and Sensitivity Test using Twin Experiments
Kim, Young-Ho ; Lyu, Sang-Jin ; Choi, Byoung-Ju ; Cho, Yang-Ki ; Kim, Young-Gyu ;
Ocean and Polar Research, volume 30, issue 2, 2008, Pages 129~140
DOI : 10.4217/OPR.2008.30.2.129
As a preliminary effort to establish a data assimilative ocean forecasting system, we reviewed the theory of the Ensemble Kamlan Filter (EnKF) and developed practical techniques to apply the EnKF algorithm in a real ocean circulation modeling system. To verify the performance of the developed EnKF algorithm, a wind-driven double gyre was established in a rectangular ocean using the Regional Ocean Modeling System (ROMS) and the EnKF algorithm was implemented. In the ideal ocean, sea surface temperature and sea surface height were assimilated. The results showed that the multivariate background error covariance is useful in the EnKF system. We also tested the sensitivity of the EnKF algorithm to the localization and inflation of the background error covariance and the number of ensemble members. In the sensitivity tests, the ensemble spread as well as the root-mean square (RMS) error of the ensemble mean was assessed. The EnKF produces the optimal solution as the ensemble spread approaches the RMS error of the ensemble mean because the ensembles are well distributed so that they may include the true state. The localization and inflation of the background error covariance increased the ensemble spread while building up well-distributed ensembles. Without the localization of the background error covariance, the ensemble spread tended to decrease continuously over time. In addition, the ensemble spread is proportional to the number of ensemble members. However, it is difficult to increase the ensemble members because of the computational cost.
Estimating Consumer Surplus for Recreational Sea Fishing using Individual Travel Cost Method
Pyo, Hee-Dong ; Park, Cheol-Hyung ; Chung, Jin-Ho ;
Ocean and Polar Research, volume 30, issue 2, 2008, Pages 141~148
DOI : 10.4217/OPR.2008.30.2.141
This paper aims at estimating consumer surplus for recreational sea fishing in Tongyeong coastal area using individual travel cost method. A Poisson model (PM), a negative binomial model (NBM), a truncated Poisson model (TPM), and a truncated negative binomial model (TNBM) are applied for individual travel cost method in order to account characteristics of count data (non-negative discrete data.) The survey was conducted for 462 inshore anglers using personal interview method in Tongyeong during July and October 2007. Respondents were asked about how often they do fishing, travel costs, catch, income, and so on. Because of over-dispersion problem in PM and TPM, NBM and TNBM were considered to be more appropriate statistically. All parameters estimated are statistically significant and theoretically valid. As the results based on TNBM, consumer surplus per trip was estimated to be 183,486 won, total consumer surplus per person and per year 3,399,658 won, and the marginal effect of consumer surplus on % changes in catch rate is 185,372 won.
Error Bounds Analysis of the Environmental Data in Lake Shihwa and Incheon Coastal Zone
Cho, Hong-Yeon ;
Ocean and Polar Research, volume 30, issue 2, 2008, Pages 149~158
DOI : 10.4217/OPR.2008.30.2.149
The characteristic analysis of the estimated population parameters, i.e., standard deviation and error bound of coastal pollutant concentrations (hereafter PC, i.e., COD, TN, and TP concentrations), was carried out by using environmental data with different sampling frequency in Lake Shihwa and Incheon coastal zone. The results clearly show that standard deviation of the PC increases as its mean value increases. The error bounds of the annual mean values based on seasonally measured DO concentrations and PC data in Incheon coastal zone were estimated as ranges 2.26 mg/l,
, respectively. In terms of annual mean of the DO concentration and PC in Lake Shihwa, the error bounds based on monthly measured data from 1997 to 2003 were also estimated as ranges 4.0 mg/l, 3.0 mg/l,
, and 0.05 mg/l, respectively. The error bound on the basis of real-time monitoring data is
only as compared to that of monthly measured data.
Yeosu Declaration and Its Implications on Yeosu EXPO
Chung, Suh-Yong ;
Ocean and Polar Research, volume 30, issue 2, 2008, Pages 159~172
DOI : 10.4217/OPR.2008.30.2.159
During the course of its efforts to host the 2012 EXPO in Yeosu, Korea, the Korean government promised to the members of the International Exhibition Bureau (BIE) to adopt the so-called Yeosu Declaration. Considering the year 2012 will likely witness the adoption of another global scale environmental declaration as such as the Stockholm, Rio and Johannesburg Declarations, Yeosu Declaration may contribute not only to emphasizing the theme of the 2012 Yeosu EXPO, The Living Ocean and Coast: Diversity of Resources and Sustainable Activities, but also to sharing its efforts to protect the environment with the international society. As there has been no precedence of adopting any declaration in the history of EXPO, a careful preparation for the adoption of Yeosu Declaration is necessary as suggested in this article.
A Study on the Management of International Fishery Resources using Cooperative Game Theory
Choi, Jong-Du ; Cho, Jung-Hee ;
Ocean and Polar Research, volume 30, issue 2, 2008, Pages 173~180
DOI : 10.4217/OPR.2008.30.2.173
This study demonstrates that cooperative management can provide more benefits than noncooperative management for Korea and Japan fishery. We have studied one management strategy, namely, fishing under joint maximization of net benefits in coastal waters of two countries, using a cooperative game theory. The present net return under non-cooperation amounts to 420,255 million won. However, if two countries cooperate one with another, this figure can get to 2,636,565 million won. We consider this to be an important conclusion as close management relationships have developed between the two countries since the establishment of the EEZ in 1996. The results of the study can also help balance resource conservation and the appropriate catch quota in each country.
Hydroacoustic Survey of Spatio-Temporal Distribution of Demersal Fish Aggregations Near the West Coast of Jeju Island, Korea
Kang, Dong-Hyug ; Im, Yang-Jae ; Lee, Chang-Won ; Yoo, Joon-Taek ; Myoung, Jung-Goo ;
Ocean and Polar Research, volume 30, issue 2, 2008, Pages 181~191
DOI : 10.4217/OPR.2008.30.2.181
This study aims at assessment of spatio-temporal distribution of demersal fish aggregations near the west coast of Jeju Island using hydroacoustic survey. A 200 kHz split beam transducer attached to a small towed body was used for all acoustic investigations. The received acoustic data were in situ acoustic target strength (TS, dB) for all pings and nautical area scattering coefficient(NASC,
) for 0.1 mile along 12 acoustic transects. Demersal fish aggregations are distributed around the coastal slope having 20 to 30 m depth throughout all seasons. The concentration is higher during the summer season. With regard spatial distribution, higher demersal fish aggregations have been detected near the West coast of Shinchang and especially near Chagwi-do. Pelagic fish aggregations were higher to the south of Chagwi-do during the spring season. Additionally, standing stock of demersal fish aggregations from the NASC data, TS function, and length-weight function of dominant species was estimated as follows: 3.2 ton (CV 21.8%) in December 2006, 17.9 ton (CV 21.6%) in April 2007, 30.8 ton (CV 17.8%) in June 2007, and 22.5 ton (CV 24.2%) in October 2007. The application of hydroacoustic methods offers a new approach to understanding spatiotemporal structure and estimate the biomass of demersal fish aggregations in the coastal area. And the results can be made up limitations of qualitative analysis through net and diving for fisheries resources survey in coastal area.
Seasonal Volume Transport Variation and Origin of the Tsushima Warm Current
You, Sung-Hyup ; Yoon, Jong-Hwan ;
Ocean and Polar Research, volume 30, issue 2, 2008, Pages 193~205
DOI : 10.4217/OPR.2008.30.2.193
A model of the current and seasonal volume transport in the East China Sea was used to investigate the origin of the Tsushima Warm Current (TSWC). The modeled volume transport field suggested that the current field west of Kyushu (
) was divided into two regions, R1 and R2, according to the bottom depth. R1 consisted of the Taiwan Warm Current (TWWC) region and the mixed Kuroshio-TWWC (MKT) water region, while R2 was the modified Kuroshio water (MKW) region west of Kyushu. The MKW branched from the Kuroshio and flowed into the Korea/Tsushima Straits through the Cheju-Kyushu Strait, contributing 41% of the annual mean volume transport of the TSWC. The TWWC and MKT water flowed into the Korea/Tsushima Straits through the Cheju-Kyushu and Cheju Straits, contributing 32% and 27% of the volume transport, respectively. The maximum volume transport of the MKW was 53% of the total volume transport of the TSWC in November, while the maximum volume transport of the water in the R1 region through the Cheju-Kyushu Strait was 41% in July. Hence, there were two peaks per year of volume transport in the TSWC.
Consideration on the Preparation of Current Meters for Deep-sea Mooring and Cause of Mooring Recovery Failures
Hwang, Sang-Chul ;
Ocean and Polar Research, volume 30, issue 2, 2008, Pages 207~213
DOI : 10.4217/OPR.2008.30.2.207
An interest in deep-sea measurements has been gradually increased in association with global warming and the need for deep-sea resources development. Long-term mooring of current meters has been recently conducted primarily for these purposes. In general, current meters equipped on a mooring line are deployed and recovered for a planned period in the sea. This paper describes all the preparations for deep-sea mooring. It also reviews the possible causes of the failures of recovery, which occasionally happens in the sea.