Abstract ▼

This research project during its first stage, 2004-2006, consisted of mainly three parts.

(1) Air-Sea interaction focusing system variability:

Weather Generator (MM5) was used for creating 6-hr interval wind information over the Korean Peninsula including adjacent marine waters, and th

This research project during its first stage, 2004-2006, consisted of mainly three parts.

(1) Air-Sea interaction focusing system variability:

Weather Generator (MM5) was used for creating 6-hr interval wind information over the Korean Peninsula including adjacent marine waters, and this synthesized data showed similar results with those in NCEP/NCAR Reanalysis. The simulated data were compared with observed data at buoy stations. Though there were some differences in localities, the similar fluctuation pattern and high correlation, in general, appeared in both data sets, which gives a credit for synthesized wind data.
It was revealed using wavelet analysis of WAI that the variability over the equator was transferred to the mid-latitude area (including Korean Peninsula) through the upper atmosphere. The correlation analysis and EOF analysis, however, indicated that the connectivity between them was not very high.
Warming trend in Sea Surface Temperature (SST) as well as some signals in sea phenomena due to the climate regime shift in 1989 appeared partly over the Korean Peninsula with a time-lag of one month. The analysis with seasonal data indicated that the variability in air-sea interaction was more conspicuous during winter and spring than summer and fall, and temperature field was shown in opposite phase with wind field.
Meteorological information was divided by three time periods: 1970-1977, 1978-1988, and 1988-present. Similar phenomena in the North Pacific caused by climate shifting were represented in the East Sea.

(2) Recruitment processes of biological resources (eg, common squid):

Zooplankton surveys in the East China Sea indicated that copepods were the dominant species, as a whole, high abundance of zooplankton was shown in the southeast part of the Jeju Island.
Stomach content analysis for common squid was carried out to investigate the difference in seasonal and ontogenetic feeding behavior. Totals of 1368 common squid were collected monthly off Busan from September 2004 to August, 2005. Size range of common squid was 8.5-31.8 cm mantle length (ML) during the study period. Of the 1368 stomachs examined, 599 specimens (43.8%) were empty. Stomach contents indicated that common squid was carnivore: Large portion of stomach contents consisted of fish and mollusca (mainly common squid). The stomach contents index (SCI) seemed to increase with size, though there was no statistical difference between size classes significantly. Cannibalism was minimum in size range of 15-20 cm ML, but was steadily increased with size. Cephalopods were the major prey during spring and summer when common squid were small, but fish replaced it during autumn and winter when they became large.
The reproductive cycle of the common squid, Todarodes pacificus captured off Busan, Korea, between November 2003 and January 2006, was characterized by documenting changes in gonadal development, gonadosomatic index (GSI) and oocyte size-frequency distribution. GSI of females began to increase in July and reached its maximum in August, and then gradually decreased. The GSI of males maintained to increase from July to March. Five oocyte developmental stage, namely growing oocyte stage, pre-vitellogenic stage, vitellogenic stage, maturation stage and ripe stage were identified by histological observation. The changes of GSI and gonadal tissue showed that the annual reproductive cycle was classified into the following successive stages: immature (March-May), growing (June-July), mature (July-August), ripe and spawning (October to February). Based on these results, this squid population appears to be spawn several times during spawning seasons (from autumn to winter). To date, the reproductive characteristics of common squid is not well defined.
Para-larvae of common squid were collected from ten oceanographic surveys during 2003-2005. Mean length of para-larvae ranged 2.5-9.0 mm, and abundance varied by season and year. In general, more para-larvae appeared in southeastern part of Jeju Island, and they seemed to be transported to the East Sea on Tsushima Current system.

(3) Ecosystem modeling and resource management:

Average winter atmospheric pressures at sea level changed in 1998/99 to a pattern of low pressure across the north from China and Russia to Canada, with a high pressure center occupying much of the south-eastern North Pacific west of California and north of Hawaii. Biomass of most organisms in the East China Sea ecosystem decreased, relative contribution of most organisms which belongs to trophic levle III also decreased after the 1998/99 Climate Regime Shift (CRS).
Biomasses and recruitment of major small pelagic fishes declined, distributions of those were changed after the 1998/99 CRS. Catch of Spanish mackerel increased significantly. Catches of bighead croaker, flounders and akiami paste shrimp decreased significantly, but catch of common squid din not show significant difference after the 1998/99 CRS. However, it is too early to conclude that these changes are the indication of CRS. The necessity of examination for effects of 1998/99 CRS
considering more oceanographic and biological data is raised because CRS has a decadal scale usually and 1998/99 CRS are in progress.

목차 Contents

• 표지 ... 1
• 제 출 문 ... 2
• 1단계 보고서 초록 ... 3
• 요 약 문 ... 4
• SUMMARY ... 10
• CONTENTS ... 13
• 목차 ... 14
• List of Figures ... 15
• List of Tables ... 22
• 제 1 장 연구개발과제의 개요 ... 23
• 제 1 절 연구의 목적 및 필요성 ... 23
• 제 2 절 연구의 내용 및 범위 ... 24
• 제 2 장 국내외 기술개발 현황 ... 28
• 제 1 절 국내 연구 동향 ... 28
• 제 2 절 국외 연구동향 ... 29
• 제 3 장 연구개발수행 내응 및 결과 ... 31
• 제 1 절 해양-대기 시스템 변동: 해양환경 변동에 따르는 생물자원 변동과정과 생태계 모델링 연구 ... 31
• 제 2 절 생물자원의 가입기작 ... 100
• 제 3 절 생태계 모델링 및 자원관리: 동중국해에서 1998/ 99년의 기후체제전환이 생태계 구조에 미친 영향 ... 155
• 제 4 장 목표달성도 및 관련분야에의 기여도 ... 186
• 제 1 절 목표달성도 ... 186
• 제 2 절 관련분야에의 기여도 ... 189
• 제 5 장 연구개발결과의 활용계획 ... 191
• 제 6 장 참고문헌 ... 192
• 부 록 ... 201
• 끝페이지 ... 237