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        • KCI등재

          태평양-인도양 해양순환 연구 프로그램

          전동철(Dongchull Jeon),김응(Eung Kim),신창웅(Chang Woong Shin),김철호(Cheol-Ho Kim),국종성(Jong Seong Kug),이재학(Jae Hak Lee),이윤호(Youn-Ho Lee),김석현(Suk Hyun Kim) 한국해양과학기술원 2013 Ocean and Polar Research Vol.35 No.3

          One of the factors influencing the climate around Korea is the oceanic-atmospheric variability in the tropical region between the eastern Indian and the western Pacific Oceans. Lack of knowledge about the air-sea interaction in the tropical Indo-Pacific region continues to make it problematic forecasting the ocean climate in the East Asia. The ‘Tropical Indo-Pacific water transport and ecosystem monitoring EXperiment (TIPEX)’ is a program for monitoring the ocean circulation variability between Pacific and Indian Oceans and for improving the accuracy of future climate forecasting. The main goal of the TIPEX program is to quantify the climate and ocean circulation change between the Indian and the Pacific Oceans. The contents of the program are 1) to observe the mixing process of different water masses and water transport in the eastern Indian and the western Pacific, 2) to understand the large-scale oceanic-climatic variation including El Nino-Southern Oscillation (ENSO)/Warm Pool/Pacific Decadal Oscillation (PDO)/Indian Ocean Dipole (IOD), and 3) to monitor the biogeochemical processes, material flux, and biological changes due to the climate change. In order to effectively carry out the monitoring program, close international cooperation and the proper co-work sharing of tasks between China, Japan, Indonesia, and India as well as USA is required.

        • KCI등재

          2006년과 2007년 여름에 관측한 Hawaii-Chuuk 사이의 물리특성

          신창웅,김동국,전동철,김응,Shin, Chang-Woong,Kim, Dong-Guk,Jeon, Dong-Chull,Kim, Eung 한국해양과학기술원 2011 Ocean and Polar Research Vol.33 No.suppl3

          To investigate the physical characteristics and variations of oceanic parameters in the tropical central North Pacific, oceanographic surveys were carried out in summer of 2006 and 2007. The survey periods were classified by Oceanic Ni$\tilde{n}$o Index as a weak El Ni$\tilde{n}$o in 2006 and a medium La Ni$\tilde{n}$a in 2007. The survey instruments were used to acquire data on CTD (Conductivity Temperature and Depth), XBT (Expendable Bathythermograph), and TSG (Thermosalinograph). The dominant temporal variation of surface temperature was diurnal. The diurnal variation in 2007, when the La Ni$\tilde{n}$a weather pattern was in place, was stronger than that in 2006. Surface salinity in 2006 was affected by a northwestward branch of North Equatorial Current, which implies that the El Ni$\tilde{n}$o affects surface properties in the North Equatorial Current region. Two salinity minimum layers existed at stations east of Chuuk in both year's observations. The climatological vertical salinity section along $180^{\circ}E$ shows that the two salinity minimum layers exist in $2^{\circ}N{\sim}12^{\circ}N$ region, consistent with our observations. Analysis of isopycnal lines over the salinity section implies that the upper salinity minimum layer is from intrusion of the upper part of North Pacific Intermediate Water into the lower part of South Pacific Subtropical Surface Water and the lower salinity minimum layer is from Antarctic Intermediate Water.

        • KCI등재

          KOGA 기획과 활용연구

          신창웅(Chang-Woong Shin),박광순(Kwang-Soon Park),노영재(Young-Jae Rho),장경일(Kyung-Il Chang),방익찬(Ig-Chan Pang),문일주(Il-Ju Moon),김태림(Tae-Lim Kim),김봉채(Bong-Chae Kim),김동선(Dong-Sun Kim),김광희(Kwang-Hee Kim),김기완(Ki-Wan 한국해양연구원 2010 Ocean and Polar Research Vol.32 No.3

          In late 2010, the Korea Hydrographic and Oceanographic Administration proposed a national monitoring project involving the deployment of 8 realtime ocean data buoys. The area occupied by the buoy-array, located south of the Ieodo Ocean Research Station, can be regarded as a kind of gateway to Korean waters with respect to warm currents and the shipping industry. The acronym for the project, KOGA (Korea Ocean Gate Array) was derived from this aspect. To ensure the success of the project, international cooperation with the neighboring countries of China and Japan is highly desirable. Once KOGA is successfully launched and the moored buoys start to produce data, the data will be applied to various areas such as data assimilation for operational oceanography, circulation dynamics, biogeochemical studies, satellite observations, and air-sea interactions. The aim of this paper is to provide suggestions for KOGA planning and applications.

        • KCI등재

          2006년과 2007년 여름에 관측한 Hawaii-Chuuk 사이의 물리특성

          신창웅(Chang-Woong Shin),김동국(Dong Guk Kim),전동철(Dongchull Jeon),김응(Eung Kim) 한국해양연구원 2011 Ocean and Polar Research Vol.33 No.3

          한국해양연구원에서는 열대 태평양의 물리특성을 파악하기 위해 2006년과 2007년 여름에 북적도해류 해역에 해당하는 하와이(Hawaii USA)에서 축(Chuuk Micronesia)에 이르는 항로를 따라 탐사를 실시하였다. 관측은 CTD TSG XBT를 이용하였다. 탐사 기간의 열대태평양의 상황은 2006년은 엘니뇨가 발달한 초기에 해당하였으며 2007년은 반대로 라니냐가 발달한 초기에 해당하였다. 2006년 엘니뇨는 약함으로 분류되고 2007년 라니냐는 중간으로 분류되었다. 열대해역의 표층해류는 2006년 9월에는 적도반류가 강하게 흘렀고 북적도 해류의 중심 위도가 2007년에 비하여 약 2°N 정도 북상하였다. 북적도해류는 170°W까지는 12°~16°N을 중심으로 서쪽으로 흐르다가 이후는 축이 남쪽으로 이동하여 10°~14°N이 중심축이 되어 서쪽으로 흘렀다. 165°~170°W에서 북적도해류가 2개로 분지되어 일부가 북서쪽을 향하였다. 라니냐 시기인 2007년 9월에는 남적도해류가 4°N까지 넓은 폭으로 강하게 180°E까지 적도를 중심으로 서쪽으로 흐르다가 세력이 약화되고 폭이 줄어 계속 서쪽으로 흘렀다. 적도반류는 2006년보다는 약하지만 서쪽에서는 2°~4°N 동쪽에서는 4°~6°N에서 축을 이루며 동쪽으로 흘렀다. 북적도 해류는 동쪽에서는 12°~16°N 서쪽에서는 8°~12°N에서 축을 이루며 서쪽으로 흘렀다. TSG를 이용한 표층 수온 연속관측 자료는 태양복사열에 의하여 수온이 하루 주기로 변하였다. 스펙트럼 분석결과 일주기 변화가 수온 스펙트럼에서 뚜렷하며 엘니뇨 기간에 관측한 2006년보다는 라니냐 기간에 관측한 2007년 수온에서 더 뚜렷하게 나타났다. 위치에 따른 수온과 염분변화는 하와이에서 축으로 가면서 수온은 증가하고 염분은 감소하는데 2006년의 염분은 하와이에서 170°E까지 염분이 2007년보다 높지 않았다. 이것은 동태평양의 저염 분수가 북적도해류를 타고 전달되어 2006년 관측기간의 해류가 175°W 부근에서 일부가 북서쪽으로 분지되는 현상 때문이다. 단면 관측결과는 일반적으로 북태평양 수괴 분포를 따라 수직적으로 표층수 아래에 북태평양아열대표층수 북태평양중층수 심층수와 저층수의 순서로 존재하였다. 2006년 관측에서 남북 방향의 지형류는 약간의 변화를 가지면서 최대 15 ㎝/s의 남향류가 나타났다. 이것은 관측 해역의 해류가 주로 서쪽방향으로 흐르는 북적도해류대역이기 때문이며 평균적인 북적도 해류에 비하여 작게 나타났다. 관측단면의 지형류는 2006년보다 2007년에 더 작게 나타났다. 이것은 북적도 해류의 남북방향 변동이 2006년보다 2007년에 적게 나타났기 때문이다. 혼합층은 La Niña에 해당하는 2007년에 El Niño에 해당하는 2006년보다 깊게 나타났다. 관측자료에서 두 개의 염분최소층이 축 부근의 정점에서 나타났다. 180°E 단면의 기후 평균자료에서는 대체로 2°N~12°N에서 두 개의 염분최소층이 나타난다. 염분단면과 각 수괴를 대표하는 중심밀도 분포는 북태평양 중앙 열대해역에 나타나는 상층의 염분최소층은 북태평양중층수의 상부의 해수가 등밀도면을 타고 남태평양아열대표층수의 하부로 관입하여 생성된 것임을 암시하였다. To investigate the physical characteristics and variations of oceanic parameters in the tropical central North Pacific oceanographic surveys were carried out in summer of 2006 and 2007. The survey periods were classified by Oceanic Niño Index as a weak El Niño in 2006 and a medium La Niña in 2007. The survey instruments were used to acquire data on CTD (Conductivity Temperature and Depth) XBT (Expendable Bathythermograph) and TSG (Thermosalinograph). The dominant temporal variation of surface temperature was diurnal. The diurnal variation in 2007 when the La Niña weather pattern was in place was stronger than that in 2006. Surface salinity in 2006 was affected by a northwestward branch of North Equatorial Current which implies that the El Niño affects surface properties in the North Equatorial Current region. Two salinity minimum layers existed at stations east of Chuuk in both year's observations. The climatological vertical salinity section along 180°E shows that the two salinity minimum layers exist in 2°N~12°N region consistent with our observations. Analysis of isopycnal lines over the salinity section implies that the upper salinity minimum layer is from intrusion of the upper part of North Pacific Intermediate Water into the lower part of South Pacific Subtropical Surface Water and the lower salinity minimum layer is from Antarctic Intermediate Water.

        • KCI등재

          동해중층수의 일반적인 분포 특성

          신창웅(Chang-Woong Shin),변상경(Sang-Kyung Byun),김철수(Cheolsoo Kim),이재학(Jae Hak Lee),김봉채(Bong-Chae Kim),황상철(Sang-Chull Hwang),승영호(Young Ho Seung),신홍렬(Hong-Ryeol Shin) 한국해양연구원 2007 Ocean and Polar Research Vol.29 No.1

          To obtain the overall distribution patterns and characteristics of the East Sea Intermediate Water (ESIW), the historical data obtained by the Japan Maizuru Marine Observatory (MMO) and the Korea Ocean Research and Development Institute (KORDI) were analyzed. To obtain water characteristics of the ESIW on isopycnal surfaces, temperature, salinity and dissolved oxygen were interpolated at every 0.01 interval of potential density. And then the interpolated values were averaged at the same potential density. This potential density average method preserved the salinity minimum layer more clearly compared to the depth average method. The potential density (σθ) range of the ESIW was 26.9~27.3. The representative potential density of the ESIW was found to be 27.2, because the characteristics of the ESIW was clear at this density. From the horizontal distributions of physical properties on the isopycnal surface of 27.2σθ it is suggested that the low salinity ESIW circulates anticlockwise over the whole basin with the high salinity intermediate water. The low salinity intermediate water extended from the northwestern part to the east along the sub-polar front and to the Ulleung Basin along the east coast of Korea.

        • KCI등재

          해류 수직구조를 파악하기 위한 LADCP Casting 및 자료처리 방법

          김응,전동철,신창웅,김동국,Kim, Eung,Jeon, Dong-Chull,Shin, Chang-Woong,Kim, Dong-Guk 한국해양과학기술원 2011 Ocean and Polar Research Vol.33 No.suppl3

          To understand the vertical structure of ocean currents from raw data observed by lowered-ADCP (LADCP), these data require post-processing. Data were processed using Krahman's version 10.8 processing software based on Matlab. It is estimated the influence of auxiliary data affecting the processed current structure. The bottom-tracked velocities and the GPS information significantly contribute the offset on reference velocities in the bottom layer and barotropic ones in the middle layer, respectively. Good quality data can be obtained when LADCP is least tilted in pitch and roll during observation. In situ application of LADCP to the (northward) volume transports of Kuroshio in the East China Sea proved to be 24.8. Sv (= $1{\times}10^6m^3s^{-1}$) in October 2007, and 28.2 Sv in June 2008, respectively. The volume transport is relatively large over the continental slope when compared to the shelf or the deep sea.

        • KCI등재

          황해 연안에서 관측된 딱총새우 음의 특성

          김봉채,김병남,신창웅,김철수,최복경,Kim, Bong-Chae,Kim, Byoung-Nam,Shin, Chang-Woong,Kim, Cheol-Soo,Choi, Bok-Kyoung 한국해양학회 2007 바다 Vol.12 No.3

          2001년 5월에 황해 연안의 수심 약 20 m의 해역에서 10시부터 13시까지 3시간 동안 수중소음을 관측하였다. 측정기간 내내 생물음으로 추정되는 강한 수중음이 지속적으로 관찰되었다. $1{\sim}20kHz$의 주파수 대역에서 측정된 수중음의 레벨은 수중 배경소음 레벨과 비교하여 매우 높게 측정 되었다. 이러한 수중음은 연안 수중소음 레벨에 지속적으로 영향을 줄 수 있으므로 수중음의 발생 원인을 규명하고자 하였다. 본 연구에서는 기존에 발표된 논문들을 근거로 하여 수중음의 가장 유력한 음원으로 해저바닥에 서식하는 딱총새우의 음을 제시하였으며, 동일해역에서 채집한 살아있는 딱총새우로부터 방출되는 음향신호를 실험실에서 측정함으로서 이 수중음이 딱총새우에 의하여 발생된 것임을 재확인할 수 있었다. Ambient noise was measured for 3 hours on May, 2001 at a site of 20 m water depth in the Korean coast of the Yellow Sea. During the measurement, the strong underwater sound assuming by marine life was continually observed. The spectrum level of this sound was very high compared to that of underwater ambient noise over the frequency range from 1 to 20 kHz. Therefore, this underwater sound can continually affect the ambient noise level. In this study, the source of the underwater sound was investigated. The snapping shrimp was estimated as reliable source. It was confirmed through comparison with experimental results described in previously literatures. It was also confirmed through analysis of snapping shrimp sound measured under laboratory conditions.

        • KCI등재
        • KCI등재

          가덕수도 근해에서 물리적 현상과 해류의 계절 변동

          장성태(Sung-Tae Jang),전동철(Dongchull Jeon),신창웅(Chang-Woong Shin) 한국해양연구원 2008 Ocean and Polar Research Vol.30 No.1

          In order to investigate seasonal variations of the physical environments in the region of Jinhae Bay-Nakdongpo, we carried out hydrographic surveys from November 2000 to November 2001. Horizontal and vertical distribution of salinity and temperature shows large seasonal variations. Water column is well mixed in winter and stratified in summer. Low-salinity water is distributed in the form of patches because of the drainage control at the Nakdong River. Seasonal variations in the sea near Gadeok-Sudo are affected by topography, river discharge and tidal current. Currents have been measured using a bottom mounted ADCP and DCM12 between November 2000 and August 2001 in the Gadeok-Sudo. The current in the Gadeok-Sudo shows a distinct two-layer structure with reversed current. Low-pass filtered time series of wind, sea elevation and current are coherent for the period of 1-2 days and are attributed to Ekman-like dynamics. Spatial and temporal circulation pattern shows a slight different. The subtidal current in Jinhae Bay goes northward, however is reversed in the Gadeok-Sudo mouth.

        • KCI등재

          해류 수직구조를 파악하기 위한 LADCP Casting 및 자료처리 방법

          김응(Eung Kim),전동철(Dongchull Jeon),신창웅(Chang Woong Shin),김동국(Dong Guk Kim) 한국해양연구원 2011 Ocean and Polar Research Vol.33 No.3

          To understand the vertical structure of ocean currents from raw data observed by lowered-ADCP (LADCP) these data require post-processing. Data were processed using Krahman's version 10.8 processing software based on Matlab. It is estimated the influence of auxiliary data affecting the processed current structure. The bottom-tracked velocities and the GPS information significantly contribute the offset on reference velocities in the bottom layer and barotropic ones in the middle layer respectively. Good quality data can be obtained when LADCP is least tilted in pitch and roll during observation. In situ application of LADCP to the (northward) volume transports of Kuroshio in the East China Sea proved to be 24.8. Sv (= 1*10⁶ m³s⁻¹) in October 2007 and 28.2 Sv in June 2008 respectively. The volume transport is relatively large over the continental slope when compared to the shelf or the deep sea.

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