This paper deals with the hydrographic condition and variability in the Yellow Sea and East China Seas during winter. It is based on data obtained from the joint Chinese(Norwegian surveys during the period 1984 to 199...This paper deals with the hydrographic condition and variability in the Yellow Sea and East China Seas during winter. It is based on data obtained from the joint Chinese(Norwegian surveys during the period 1984 to 1995. The results indicated that:(1) From November to March, the water temperature there was decreasing, the Yellow Sea Cold Water, the Yellow Sea Warm Current and Yellow Sea Coastal Current mainly dominated the survey areas;(2) The vertical distribution of hydrographic factors varied through the winter. From November to March the thickness of upper homogeneous layer became thicker and the thermocline, halocline and Yellow Sea Cold Water less pronounced, in January March, these features disappeared and the hydrographic conditions were almost homogenous through the whole water column from surface to bottom;(3) The Yellow Sea Cold Water mass and Yellow Sea Warm Current showed strong clear inter annual variation. The temperature and salinity of Yellow Sea Cold Water were more stable. However, its relative volume in the stronger year(November, 1986) was 4 44 times that in the weaker year(Novemner, 1985). The Yellow Sea Warm Current’s speed in the stronger year(January, 1986) was 1.21 times that in the weaker year(January, 1992);(4) Anchovy was mainly distributed in the warm or cold water tongue areas formed by Yellow Sea Warm Current or Yellow Sea Coastal Current with temperature of 11 13℃.The thermocline had apparent effects on their vertical migration and they tended to stay above it most of the day.展开更多
Compared with the stagnanteconomy of the rest world,Asian-Pa-cific economy has been experiencingthe hightest growth since the 1980s.Now,most researchers and officials,and even entrepreneurs believe
In the South Yellow Sea Basin,Mesozoic–Paleozoic marine strata are generally well developed with large thickness,and no substantial breakthroughs have been made in hydrocarbon exploration.Through research,it is belie...In the South Yellow Sea Basin,Mesozoic–Paleozoic marine strata are generally well developed with large thickness,and no substantial breakthroughs have been made in hydrocarbon exploration.Through research,it is believed that the Upper Permian–Lower Triassic can be regarded as a long-term base-level cycle.Based on drilling data,characteristics of the lithology–electric property combination cyclicity,and the special lithology,the long-term base-level cycle was divided into five medium-term base-level cycles(MC1–MC5).On this basis,the Permian–Triassic sedimentary systems and their filling model were analyzed in accordance with the change of base-level cycle and transition of sedimentary environment,as well as characteristics of the drilling sedimentary facies and seismic facies.The results show that there were six sedimentary systems(fluvial,delta,tidal flat,open platform,restricted platform,and continental shelf)developed in the Upper Permian–Lower Triassic,the sedimentary systems were distributed such that the water was deep in the northwest and shallow in the southeast,and there were two base-level cycle filling models(a relatively stable tidal flat facies and a rapidly transgressive continental shelf facies to stable platform facies)developed in the Upper Permian–Lower Triassic.These models can provide a basis for evaluation of the Mesozoic–Paleozoic hydrocarbon geology in the South Yellow Sea Basin.展开更多
The paper deals with growth of Japanese anchovy (Engraulis japonicus) and variations in length by area and maturity of anchovy and some selected fish species obtained during surveys with R/V "Bei Dou" in the...The paper deals with growth of Japanese anchovy (Engraulis japonicus) and variations in length by area and maturity of anchovy and some selected fish species obtained during surveys with R/V "Bei Dou" in the Yellow Sea and East China Sea,in 1984-1999.Demersal trawl catch rates for some selected fish species from the same surveys are also included.No density dependent growth in length or weight of anchovy was found.Reduced length at maturity of small yellow croaker was apparent from 1986 to 1994.展开更多
This paper deals with abundance estimations of anchovy obtained by the acoustic method during surveys with R/V "Bei Dou" in the Yellow Sea and East China Sea, the development of the stock size and the fisher...This paper deals with abundance estimations of anchovy obtained by the acoustic method during surveys with R/V "Bei Dou" in the Yellow Sea and East China Sea, the development of the stock size and the fishery of anchovy in 1984 1999.展开更多
The fundamental principle for differentiating water masses is a strict consideration of their relative "interior homogeneity" and obvious "exterior differences" with others in characteristics. The ...The fundamental principle for differentiating water masses is a strict consideration of their relative "interior homogeneity" and obvious "exterior differences" with others in characteristics. The conceptions of water type, water mass and water system are dealt with on the basis of the theory of fuzzy sets. A proposal to apply the theory of fuzzy sets to define the water mass and its core, independent area, boundary and mixing area is put forward.As an example, the membership function of the surface water masses in the Yellow Sea and East China Sea in August, 1979, are considered. Their cores, independent areas, boundaries, mixing areas and the approximation degrees between different water masses are calculated respectively. The water masses are ranged according to their fuzzy degrees.展开更多
This paper uses the hydrographic date obtained during the springs from 1960to 1980 with the temperature and salinty as the major indexes. By combining the method of the chustering analysis which approaches T-S diagram...This paper uses the hydrographic date obtained during the springs from 1960to 1980 with the temperature and salinty as the major indexes. By combining the method of the chustering analysis which approaches T-S diagram with the study of the geographical characteristics in the aea area, it makes a comprehensive analysis of the development in the straeture of the spring water Basses in the sea area off Yaadtai, Weihai and Shidao and its relations with the fishing periods and fishing zones. The resalts show that the variations in the strength and the position shifting of the cold water in the northern Yellow Sea and off Qiagdao as well as the Warm water in the Yellow Sea will greatly affect the time when the fishing period be-gins as well as the shifting of the positions of the fishing zone in spring.展开更多
【目的】陆架—边缘海作为海陆相互作用的关键区域,其沉积物蕴含着气候、海平面变化、生物地球化学循环和人类活动等重要信息。探讨末次冰消期以来沉积环境演化背景下南黄海中部泥质区有机碳埋藏的阶段性特征和影响因素具有重要意义。...【目的】陆架—边缘海作为海陆相互作用的关键区域,其沉积物蕴含着气候、海平面变化、生物地球化学循环和人类活动等重要信息。探讨末次冰消期以来沉积环境演化背景下南黄海中部泥质区有机碳埋藏的阶段性特征和影响因素具有重要意义。【方法】对取自该区东侧的H12岩心进行了AMS^(14)C测年、粒度、总有机碳(TOC)、总氮(TN)及稳定碳同位素(δ^(13)C)进行分析。【结果】相对低海平面时期(17~12.6 ka B.P.)发育硬质黏土层,TOC埋藏通量较高,以陆源有机质输入为主。海侵期(12.6~7.8 ka B.P.)受潮流侵蚀等动力作用影响,TOC来源为海陆混合源,陆源TOC埋藏通量在8 ka B.P.左右出现明显高值,对应沉积速率显著升高,可能反映季风驱动下沉积物供应和输送方式变化;高海平面时期(7.8 ka B.P.以来)以海源贡献为主;其中,5~2 ka B.P.,TOC含量在百年尺度上变化幅度较大,与黑潮强度减弱的阶段基本一致,TOC含量的高值整体对应于东亚冬季风的强盛期,可能反映冬季风驱动下黄海暖流的增强导致海洋初级生产力、水体环境的变化,进而对TOC埋藏的影响;~2 ka B.P.以来TOC变化幅度减小,海源有机质贡献整体增加,可能与ENSO(厄尔尼诺—南方涛动)活动的加强有关。【结论】海平面变化是末次冰消期以来南黄海中部有机碳埋藏演化的主控因素,而高海面以来TOC沉积记录阶段性变化可能跟东亚冬季风等影响下黄海暖流的变化及ENSO活动有关。展开更多
文摘This paper deals with the hydrographic condition and variability in the Yellow Sea and East China Seas during winter. It is based on data obtained from the joint Chinese(Norwegian surveys during the period 1984 to 1995. The results indicated that:(1) From November to March, the water temperature there was decreasing, the Yellow Sea Cold Water, the Yellow Sea Warm Current and Yellow Sea Coastal Current mainly dominated the survey areas;(2) The vertical distribution of hydrographic factors varied through the winter. From November to March the thickness of upper homogeneous layer became thicker and the thermocline, halocline and Yellow Sea Cold Water less pronounced, in January March, these features disappeared and the hydrographic conditions were almost homogenous through the whole water column from surface to bottom;(3) The Yellow Sea Cold Water mass and Yellow Sea Warm Current showed strong clear inter annual variation. The temperature and salinity of Yellow Sea Cold Water were more stable. However, its relative volume in the stronger year(November, 1986) was 4 44 times that in the weaker year(Novemner, 1985). The Yellow Sea Warm Current’s speed in the stronger year(January, 1986) was 1.21 times that in the weaker year(January, 1992);(4) Anchovy was mainly distributed in the warm or cold water tongue areas formed by Yellow Sea Warm Current or Yellow Sea Coastal Current with temperature of 11 13℃.The thermocline had apparent effects on their vertical migration and they tended to stay above it most of the day.
文摘Compared with the stagnanteconomy of the rest world,Asian-Pa-cific economy has been experiencingthe hightest growth since the 1980s.Now,most researchers and officials,and even entrepreneurs believe
基金Projects(41506080,41702162)supported by the National Natural Science Foundation of ChinaProjects(DD20160152,DD20160147,GZH200800503)supported by China Geological Survey+1 种基金Projects(XQ-2005-01,2009GYXQ10)supported by China Ministry of Land and ResourcesProject(201602004)supported by the Postdoctoral Innovation Foundation of Shandong Province,China
文摘In the South Yellow Sea Basin,Mesozoic–Paleozoic marine strata are generally well developed with large thickness,and no substantial breakthroughs have been made in hydrocarbon exploration.Through research,it is believed that the Upper Permian–Lower Triassic can be regarded as a long-term base-level cycle.Based on drilling data,characteristics of the lithology–electric property combination cyclicity,and the special lithology,the long-term base-level cycle was divided into five medium-term base-level cycles(MC1–MC5).On this basis,the Permian–Triassic sedimentary systems and their filling model were analyzed in accordance with the change of base-level cycle and transition of sedimentary environment,as well as characteristics of the drilling sedimentary facies and seismic facies.The results show that there were six sedimentary systems(fluvial,delta,tidal flat,open platform,restricted platform,and continental shelf)developed in the Upper Permian–Lower Triassic,the sedimentary systems were distributed such that the water was deep in the northwest and shallow in the southeast,and there were two base-level cycle filling models(a relatively stable tidal flat facies and a rapidly transgressive continental shelf facies to stable platform facies)developed in the Upper Permian–Lower Triassic.These models can provide a basis for evaluation of the Mesozoic–Paleozoic hydrocarbon geology in the South Yellow Sea Basin.
文摘The paper deals with growth of Japanese anchovy (Engraulis japonicus) and variations in length by area and maturity of anchovy and some selected fish species obtained during surveys with R/V "Bei Dou" in the Yellow Sea and East China Sea,in 1984-1999.Demersal trawl catch rates for some selected fish species from the same surveys are also included.No density dependent growth in length or weight of anchovy was found.Reduced length at maturity of small yellow croaker was apparent from 1986 to 1994.
文摘This paper deals with abundance estimations of anchovy obtained by the acoustic method during surveys with R/V "Bei Dou" in the Yellow Sea and East China Sea, the development of the stock size and the fishery of anchovy in 1984 1999.
文摘The fundamental principle for differentiating water masses is a strict consideration of their relative "interior homogeneity" and obvious "exterior differences" with others in characteristics. The conceptions of water type, water mass and water system are dealt with on the basis of the theory of fuzzy sets. A proposal to apply the theory of fuzzy sets to define the water mass and its core, independent area, boundary and mixing area is put forward.As an example, the membership function of the surface water masses in the Yellow Sea and East China Sea in August, 1979, are considered. Their cores, independent areas, boundaries, mixing areas and the approximation degrees between different water masses are calculated respectively. The water masses are ranged according to their fuzzy degrees.
文摘This paper uses the hydrographic date obtained during the springs from 1960to 1980 with the temperature and salinty as the major indexes. By combining the method of the chustering analysis which approaches T-S diagram with the study of the geographical characteristics in the aea area, it makes a comprehensive analysis of the development in the straeture of the spring water Basses in the sea area off Yaadtai, Weihai and Shidao and its relations with the fishing periods and fishing zones. The resalts show that the variations in the strength and the position shifting of the cold water in the northern Yellow Sea and off Qiagdao as well as the Warm water in the Yellow Sea will greatly affect the time when the fishing period be-gins as well as the shifting of the positions of the fishing zone in spring.
文摘【目的】陆架—边缘海作为海陆相互作用的关键区域,其沉积物蕴含着气候、海平面变化、生物地球化学循环和人类活动等重要信息。探讨末次冰消期以来沉积环境演化背景下南黄海中部泥质区有机碳埋藏的阶段性特征和影响因素具有重要意义。【方法】对取自该区东侧的H12岩心进行了AMS^(14)C测年、粒度、总有机碳(TOC)、总氮(TN)及稳定碳同位素(δ^(13)C)进行分析。【结果】相对低海平面时期(17~12.6 ka B.P.)发育硬质黏土层,TOC埋藏通量较高,以陆源有机质输入为主。海侵期(12.6~7.8 ka B.P.)受潮流侵蚀等动力作用影响,TOC来源为海陆混合源,陆源TOC埋藏通量在8 ka B.P.左右出现明显高值,对应沉积速率显著升高,可能反映季风驱动下沉积物供应和输送方式变化;高海平面时期(7.8 ka B.P.以来)以海源贡献为主;其中,5~2 ka B.P.,TOC含量在百年尺度上变化幅度较大,与黑潮强度减弱的阶段基本一致,TOC含量的高值整体对应于东亚冬季风的强盛期,可能反映冬季风驱动下黄海暖流的增强导致海洋初级生产力、水体环境的变化,进而对TOC埋藏的影响;~2 ka B.P.以来TOC变化幅度减小,海源有机质贡献整体增加,可能与ENSO(厄尔尼诺—南方涛动)活动的加强有关。【结论】海平面变化是末次冰消期以来南黄海中部有机碳埋藏演化的主控因素,而高海面以来TOC沉积记录阶段性变化可能跟东亚冬季风等影响下黄海暖流的变化及ENSO活动有关。
