초록 ▼

○ 한반도 해역 고해상도 재분석자료 생산과 검증
- 해면고도의 차이로부터 가상의 수온과 염분 프로파일을 생성하고 이를 동화함으로 위성해면고도계 자료동화 시스템을 개발하여 전지구 모델에 시범 적용함.
- NCEP GODAS, ECMWF ORAS4, KIOST ESM_V1, SODA 3.4.2 등 다양한 해양재분석 자료를 비교 검증함.

○ 재분석자료 검증을 위한 제주해협 표층해류 모니터링
- 이상신호 발생시 신속대응 시스템을 구축함으로, 제주해협 표층해류 모니터링 시스템의 연간 시계열 자료수집율을 91.5%

○ 한반도 해역 고해상도 재분석자료 생산과 검증
- 해면고도의 차이로부터 가상의 수온과 염분 프로파일을 생성하고 이를 동화함으로 위성해면고도계 자료동화 시스템을 개발하여 전지구 모델에 시범 적용함.
- NCEP GODAS, ECMWF ORAS4, KIOST ESM_V1, SODA 3.4.2 등 다양한 해양재분석 자료를 비교 검증함.

○ 재분석자료 검증을 위한 제주해협 표층해류 모니터링
- 이상신호 발생시 신속대응 시스템을 구축함으로, 제주해협 표층해류 모니터링 시스템의 연간 시계열 자료수집율을 91.5%로 유지함. HF Radar 표층해류자료를 실측자료와 비교 검증함.

○ 모형의 성능 향상을 위한 아중규모 난류혼합의 모수화
- CARTHE 부이를 사용하여 제주북부지역에서 4월과 11월에 표층 부이실험을 수행함. 반일주조가 강하게 관찰된 제주해협에서는 수평전단과 아중규모순환이 난류확산을 주도하였으며, 온도전선과 평균장이 강한 대한해협에서는 중간규모이상의 순환이 난류확산을 주도하였음.

○ 재분석자료 기반 고수온 저염분 현상의 구조와 영향 평가
- 1982년부터 올해 2018년까지 고수온 이벤트의 빈도(Event frequency), 총 발생 일수(duration), 최대 강도(Intensity)의 장기 데이터베이스를 구축함. 한반도 고수온 현상은 북서태평양(필리핀해) 해수면 온도 상승과 대기 고기압이 강화되어 나타나는 폭염과 상관성이 높은 것으로 보임.
- 경기만 연안해역에서의 해면염분 추정 알고리즘을 개발하고 GOCI에 적용함.

○ 재분석자료 기반 생태계모델 적용과 활용
- 우리나라에서 발생하는 코클로디니움 적조(HAB)의 장기관측자료 결과에 근거하면, 하계 중국 양쯔강으로부터 유입되는 강우량과 양쯔강 희석수 확장경로 및 범위가 적조발생 및 비발생 지역과 밀접한 관계가 있는 것으로 파악되었음.

(출처 : 초록 5p)

Abstract ▼

Ⅳ. Results
1. Production and Verification of High-resolution Reanalysis Data in Korean Sea
○ Development of the Data Assimilation System using the Satellite Sea Level data
- To increase simulate performance for vertical structures of the temperature and salinity, establishing the advanced D

Ⅳ. Results
1. Production and Verification of High-resolution Reanalysis Data in Korean Sea
○ Development of the Data Assimilation System using the Satellite Sea Level data
- To increase simulate performance for vertical structures of the temperature and salinity, establishing the advanced Data Assimilation System which is require the Satellite Sea Level data
- When this method was applied, the lower SSS bias show in tropical ocean, the Northwest Pacific and the Antarctic Ocean than the DA-free results.
- Realistically simulated North Equatorial Undercurrent (NEUC) similar to the previous results.

○ Comparison of the volume transports in the Korea Strait and the East China Sea from the reanalysis data with the observed transport
- Volume transports estimated from the four reanalysis datasets were evaluated with the comparison of observed transport.
- NCEP GODAS reveals high credibility, showing coincidence of transports in the Korea Strait and the East China Sea section with the observed by Takikawa and Yoon(2005).
- ECMWF ORAS4 and KIOST ESM_v1 also show the Korea Strait transport corresponding to the observation.
- However, for the calculation of transport, they need more careful treatment in their velocity and depth information, as they show some difference in the transports between the Korea Strait and the East China Sea section. SODA 3.4.2 reveals the lowest credibility by showing the largest difference with the observation.

○ Comparison of the reanalysis data with the observations on the distributions of warm eddies in the western part of the subtropical North Pacific
- Sea surface temperature(SST) in the KIOST ESM_v1 and NCEP GODAS reanalysis data were compared with the observation-based OISST and HadISST datasets in the northwestern Pacific subtropical region.
- KIOST ESM_v1 and NCEP GODAS show a good performance in their SST product as they represent a very close pattern of monthly mean SST to the OISST and HadISST.
- Especially KIOST ESM_v1 produced a very exact pattern of warm eddies corresponding to the OISST for their location and seasonal variations.

2. Monitoring of sea surface currents in northern Jeju Strait using HFR for the verification of reanalysis data
○ The annual time series data collection rate of the regional surface ocean currents in the northern Jeju Island using HFR is 91.5%
○ Establishment of quick response system in case of problems through real-time monitoring system
○ The surface current data of the northern of Jeju Island observed with HFR have a relatively high correlation coefficient (R=0.629∼0.831) when compared with the RCM current meter
○ In comparison with the two-type drifts HFR and surface drifts show high correlation coefficient (R=0.93).
○ In the verification of HFR, it is possible to minimize the error by using the drift buoys within 1-meter of the sea-surface layer.

3. Parameterization of the Submesoscale Turbulent Mixing for Improving Model Performance
○ Surface Buoy Experiment
- The observations had been performed twice in April and November on the Northern Sea of Jeju island
- In the April experiment, all the buoy passed through the northern sea of Tsushima island, but it passed both north and south of the island in November experiments. And some buoys had been moved south into the southern coast of Japan due to the northwest wind.
- About 35% of the buoys which is starting from the South Sea, had been landed to Jeju island or coastal region in Japan by the impact of the wind.

○ Analysis of turbulent flow characteristics using statistical models
- Diffusion statistics appear in the Jeju Strait and the Korea Strait, which have different physical characteristics.
- Horizontal shear stress and sub-mesoscale circulation led the diffusion of turbulence in the Jeju Strait where semidiurnal surface was strongly observed.
- In the Korea Strait, where the temperature front was strong, mesoscale circulations led the turbulent flow diffusion.

○ Literature survey on the random walk and the non-linear stochastic model
- As the velocity distribution of speed field calculated from the oceanographic satellite shows non-Gaussian, the use of random walk should be stopped and the use of high-dimensional nonlinear static model is recommended.

4. Evaluation of structure and effect of high temperature and low salinity phenomena based on the reanalysis data
○ Analysis of high temperature phenomena in the Korean Peninsula based on the satellite data
- The value of the upper 90 percentile of sea level temperature over the past 30 years is defined as the occurrence of a high temperature event when the boundary value exceeds the boundary value.
- boundary value of the high water temperature each southern Korea is about 27 degrees Celsius, the East Sea is about 25 ℃, which is applied, by high temperature event can be detected.

○ Classification of high temperature phenomena in the Korean Peninsula based on the observations
- Analyzed the long - term trends of the JJA SST around the Korea Peninsula. The descent trend shows in the Yellow Sea. But increase trends show in the East China Sea, East Sea and South Sea.
- Builds long-term database of the high-temperature event such as frequency, duration, and Intensity from 1982 to 2018.
- Analysis on the inter-annual variability of the high temperature in 5 marginal seas with different high temperature trends
- EOF analysis of the long-term duration variability for high-temperature events was performed to determine the cause of this phenomena.
- Main components (PC1) are strongly correlated with the warming of sea level temperatures in the northwest Pacific (Philippine Sea).
- When the correlation between the PC2 and 500hPa Geopotential height is obtained, for high temperature in the east-west pattern, the atmospheric high pressure is strengthened, which means a large connection with the heat wave.

○ Correlation between salt and sea water CDOM in Yellow Sea region based on the in-situ data
- SSS estimation algorithm has been developed and applied to GOCI. And its results have been compared with HYCOM data.

5. Ecological model application and utilization
○ Relationship between long-term trends of red tide organism (HABs) and extension of Yangtze diluted water in Korean water
- We confirmed the non-outbreak mechanism of red tide dinoflagellate Cochlodinium polykrikoides in Korean water related with extension of Yangtze diluted water by much rainfall of Yangtze River area in early July, which is very important role in controlling the C. polykrikoides population densities.
- In particular, huge red tide event of C. polykrikoides in Korean water did not occur when salinity was relatively kept to low (i.e., 28-30 psu) in the southern area (SSFZ: South Sea Frontal Zone) including the Jeju channel based on the long-term data of red tide.

○ Distributional characteristics of soft coral in Korean water
- We demonstrated the bio-geographical distribution pattern and mean coverage of Coral Dendronephthya suensoni and Dendronephthya spinulosa in Korean water

○ Long-term catch trends of commercial fish
- Due to temperature increase related global warming, catch of cold water fish such as pollock and pacific saury was decreased, whereas catch of warm water fish (i. e., mackerel, anchovy and squid) was gradually increased since 1990.

(출처 : SUMMARY 15p)

목차 Contents

• 표지 ... 1
• 제 출 문 ... 3
• 보고서 초록 ... 5
• 요 약 문 ... 7
• S U M M A R Y ... 13
• C O N T E N T S ... 21
• 목차 ... 23
• 그림목차 ... 24
• 표목차 ... 27
• Figure List ... 28
• Table List ... 31
• 제 1 장 서 론 ... 33
• 제 1 절 연구개발의 필요성 ... 33
• 제 2 절 연구개발 목표 및 내용 ... 35
• 제 2 장 국내외 기술개발 현황 ... 37
• 제 1 절 국내 기술개발 현황 ... 37
• 제 2 절 국외 기술개발 현황 ... 39
• 제 3 장 연구개발수행 내용 및 결과 ... 41
• 제 1 절 한반도 해역 고해상도(4km 해상도) 재분석자료 생산과 검증 ... 41
• 제 2 절 재분석자료 검증을 위한 제주해협 표층해류 모니터링 ... 55
• 제 3 절 모형의 성능 향상을 위한 아중규모 난류혼합의 모수화 ... 64
• 제 4 절 위성-재분석자료 기반 고수온 저염분 현상의 구조와 영향 평가 ... 68
• 제 5 절 재분석자료 기반 생태계모델 적용과 활용 ... 77
• 제 4 장 연구개발목표 달성도 및 대외기여도 ... 89
• 제 1 절 계획대비 연구수행의 적절성 ... 89
• 제 2 절 연구개발 성과의 달성도 및 우수성 ... 91
• 제 3 절 관련분야에의 기여도 ... 97
• 제 5 장 연구개발결과의 활용계획 ... 99
• 제 1 절 연구결과의 기술적, 경제적, 사회적 파급 효과 ... 99
• 제 2 절 연구결과의 활용계획 ... 100
• 제 6 장 참고문헌 ... 101
• 끝페이지 ... 103