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Kafe 바로가기주관연구기관 | 부경대학교 Korea Ocean Research & development Institute |
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보고서유형 | 1단계보고서 |
발행국가 | 대한민국 |
언어 | 한국어 |
발행년월 | 2010-08 |
주관부처 | 해양수산부 Ministry of Oceans and Fisheries |
등록번호 | TRKO201600011439 |
DB 구축일자 | 2016-11-19 |
키워드 | 기후변화.살오징어 가입.동물플랑크톤.생태계 모델링.수산자원관리.Climate change.recruitment of common squid.zooplankton.ecosystem modeling.fisheries management. |
본 연구과제의 제 1단계 연구는 크게 3부분으로 구성되어 있으며, 지난 3년간의 연구결과를 간단하게 요약하면 아래와 같다.
(1) 해양-대기 시스템 변동:
* Weather Generator (MM5)를 이용하여 한반도 해역의 장기간 (30년) 기상자료를 생산하였으며, 이를 지역별로 관측한 자료와 비교한 결과, 상관성이 높게 나타났음.
* 적도에서 발생한 변동성이 중위도 태평양 상층 대기를 통하여 전달되며, 변동성이 대기의 상층에서 하층으로 전달되는 과정에서 시간지연은 1개월 이내라는 것을 알 수 있었음.
본 연구과제의 제 1단계 연구는 크게 3부분으로 구성되어 있으며, 지난 3년간의 연구결과를 간단하게 요약하면 아래와 같다.
(1) 해양-대기 시스템 변동:
* Weather Generator (MM5)를 이용하여 한반도 해역의 장기간 (30년) 기상자료를 생산하였으며, 이를 지역별로 관측한 자료와 비교한 결과, 상관성이 높게 나타났음.
* 적도에서 발생한 변동성이 중위도 태평양 상층 대기를 통하여 전달되며, 변동성이 대기의 상층에서 하층으로 전달되는 과정에서 시간지연은 1개월 이내라는 것을 알 수 있었음.
* 계절별 분석 결과 대기-해양간의 변동성은 여름철과 가을철에 비해, 겨울철과 봄철에 두드러지며, 해수면 온도장과 바람장과는 반대의 위상을 가지고 있음을 확인하였음.
* 1970년~77년, 78~88년 88년 이후의 세 시대별 분석 결과에서, 북태평양에서 나타나는 climatic- shifting 현상과 유사한 패턴의 변동이 동해에서도 나타나고 있음을 확인하였음.
(2) 생물자원(오징어 자원)의 가입기작:
* 동물플랑크톤에 대한 정성적, 정량적 분석이 수행되어, 우점종인 요각류가 제주도 서남방 해역에서 높은 풍도로 나타나고 있음을 발견하였음.
* 오징어 주 먹이생물은 어류인데, 오징어가 성장하면서 동종섭이현상이 강화되었음.
* 오징어 암컷의 생식주기는 미숙기(3-5월), 성장기(6-7월), 성숙기(7-8월), 완숙 및 산란기 (10월-2월)로 나눌 수 있었으며, 7월부터 1월 사이에 여러 번 산란하는 것으로 생각됨.
* 오징어 유생은 제주도 동남방 해역에서 주로 출현하였으며, 대마난류를 따라 동해로 이동됨.
(3) 생태계 모델링 및 자원관리:
* 1998/99 기후체제전환으로 대부분 생물군의 생체량이 감소하였고, 영양단계 III에 속하는 대부분 생물군의 상대적인 기여도가 감소하였음.
* 동중국해에 서식하는 주요 어종의 분포의 변화가 있었으며, 삼치 어획량은 증가경향을 나타냈으나, 강달이, 가자미, 젓새우는 감소한 경향을 보이고 있고, 오징어는 여전히 높은 수준 으로 별다른 변화가 없었음.
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.
과제명(ProjectTitle) : | - |
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연구책임자(Manager) : | - |
과제기간(DetailSeriesProject) : | - |
총연구비 (DetailSeriesProject) : | - |
키워드(keyword) : | - |
과제수행기간(LeadAgency) : | - |
연구목표(Goal) : | - |
연구내용(Abstract) : | - |
기대효과(Effect) : | - |
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