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Distribution of molluscan remains in the sediment of the Chukchi Sea and its vicinity, the Arctic

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Acta Oceanologica Sinica 2003年第4期22卷 607-619页

作者： Gao Aiguo 1,2. Xu Fengshan3. Sun Haiqing 1,2. Li Lon1 1. first {3. of {2., state oceanic administration, qingdao 2.6061,China. 2. Key Laboratory of Marine Sedimentology and Environmental Geology, state oceanic administration, qingdao 2.6061,China 3. {3. of Oceanology, Chinese Academy of Sciences, qingdao 2.6071,China first institute of {2. State Oceanic Administration Qingdao 266061 China institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Key Lab. Mar. Sedimentol./Environ. State Oceanic Administration Qingdao 266061 China

The result of an analysis of mollusca remains collected from the Chukchi Sea, Beaufort Sea and Bering Sea in the first Chinese National Arctic Research Expedition, from July to September, 1999 is presented. Seventeen species of mollusca have been identified, which belong to two classes: Bivalvia and Gastropoda. The compositions of the mollusca are very simple. According to the distribution pattern two groups may be distinguished among molluscan species. The Pan-Arctic and circumboreal group comprises Nuculana pernula, ***, Nucula bellotii, Astarte montagui, Seripes groenlandicus, Macoma calcarea, M. moesta alaskana, Liocyrna fluctuosa, Mya pseudoarenaria and Turritella polaris. Three species, Cyclocardia crebricostata, Trichotrois coronata and Argobuccinum oregonense are components of the Pan-Arctic and Pacific boreal group. With regard to feeding habits, detritus feeders dominate. There are 7 species of detritus feeders, i.e., Nuculana pernula, N. radiata, Nucula bellotii, Macoma calcarea, M. moesta alaskana, Macoma sp. and Trichotropis coronata. Detritus feeders are dominant with regard to the numbers of species as well as to the frequency of occurrence. Macoma calcarea is the most abundant species.

关键词： Chukchi Sea Beaufort Sea Bering Sea molluscan remains

Structural control of the Gagua “Wedge” Zone east of Taiwan Island on the southern Okinawa Trough

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Science China Earth Sciences 2005年第8期48卷 1165-1174页

作者： ZHENG Yanpeng1,2.3. LIU Baohua2.3. WU Jinlong2. LIANG Ruicai2.3. LIU Chenguang2.3.& ZHANG Zhengmin1 1. Marine Geology College, Ocean University of China, qingdao 2.6003. China {2., state oceanic administration, qingdao 2.6061, China 3. Key Laboratory of Marine Sedimentology and Environmental Geology, state oceanic administration, qingdao 2.6061, China Marine Geology College Ocean University of China Qingdao China first institute of {2. State Oceanic Administration Qingdao China Key Laboratory of Marine Sedimentology and Environmental Geology State Oceanic Administration Qingdao China

Based on compositive analysis and interpretation of the observed and historical data, the geophysical field characters and structural properties of the Gagua “Wedge” Zone of the sea area east of Taiwan Island and the primary tectonic stress direction and its variabilities of backarc spreading in the southern Okinawa Trough are studied. It is concluded from the study results that the Gagua “Wedge” Zone is structurally consistent with the Gagua ridge and two fault basins on both sides of the Gagua ridge, and adjusts the moving direction and distance of the western Philippine Sea plate to make the northwestward motion of the plate on its east side change to the northward subduction of the plate on its west side so that the primary tectonic stress direction of the Okinawa Trough changed from NW-SE to nearly N-S, which provided the stress source for the Okinawa Trough to enter the second spreading stage.

关键词： east of Taiwan Island, Gagua "Wedge" Zone, Okinawa Trough, structural control.

Relationship between magnetic fabric parameters and dynamic characteristics of deposits in different environments

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Chinese Science Bulletin 1998年第22期43卷 1917-1921页

作者： CHEN Qingqiang 1,3., LI Congxian\+1 and CONG Youzi\+2.1. Marine Geology Laboratory, Tongji University, Shanghai 2.0092. China {3., state {2. administration of China, qingdao 2.6003. China 3. Guangzhou institute of Marine Geology Laboratory Tongji University Shanghai China Guangzhou institute of Geochemistry Chinese Academy of Sciences Guangzhou China first institute of {2. State Oceanic Administration of China Qingdao China

Comparison of magnetic fabric parameters of deposits in different modern sedimentary environments indicates that values of \%P, F\% and \%L\% of eolian deposits are lower obviously than those of hydrogenic ones respectively. On relationship diagrams of magnetic fabric parameters, data points of eolian samples concentrated in limited area near origin of coordinates indicate that dynamic intensity is lower with less variation; while those of hydrogenic ones depart from origin of coordinates suggest higher intensity of sedimentary dynamics. Analyses of dynamic characteristics of different sedimentary environments indicate that values of magnetic fabric parameters of deposits are determined by dynamic types and characteristics of depositional processes. Magnetic fabric analyses of deposits are effective in determination of sedimentary environments.

关键词： magnetic fabric parameters sedimentary environment transporting medium.

Size fractionated biomass and productivity of phytoplankton and new production in the Prydz Bay and the adjacent Indian sector of the Southern Ocean during the austral summer 1998/1999

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Acta Oceanologica Sinica 2003年第4期22卷 651-670页

作者： Cai Yuming 1,3. Ning Xiuren 1,2.3. Zhu Genghai3. Shi Junxian3.1. Key Laborary of Submarine Geosciences of state oceanic {2.,Hangzhou 3.0012.China. 2. Key Laborary of Ocean Dynamic Processes and Satellite oceanography of state oceanic {2.,Hangzhou 3.0012.China 3. Second institute of oceanography of state oceanic {2., Hangzhou 3.0012.China Key Lab. of Submarine Geosci. state Hangzhou 310012 China Second Inst. of Oceanogr. of state Hangzhou 310012 China Key Lab. of Ocean Dynamic Processes Hangzhou 310012 China

The paper deals with the studies on the cell abundance, the composition of dominant species, size fractionated biomass and productivity of phytoplankton, new production, the environmentally restricted mechanism in the Prydz Bay and the adjacent Indian sector of the Southern Ocean during the austral summer 1998/1999. The results showed that there was marked feature of spatial zonation in the sea areas investigated. In the Prydz Bay and its adjacent continental shelf, the biomass and productivity of phytoplankton were high; those of continental slope and open ocean area were obviously low. The nutrient concentration had opposite distribution trend, due to the consumption of phytoplankton. It mainly affected by the vertical stability of water column, grazing pressure of zooplankton, temperature and light etc. The results of size-fractionation showed that the average contribution of netplankton to total chlorophyll a in studied sea areas was 52.2.%, those of nano- and picoplankton were 2..4 % and 18.4 %, respectively. The average contribution of netplankton to total primary production was 52.4 %, those of nano- and picoplankton were 2..7 % and 18.9 %, separately. It is same as previous conclusion that the contribution of picoplankton to productivity is slightly larger than that to biomass of phytoplankton communities. The average new production and f-ratio were 2.0.6 mg/ (m(2.)d) and 0.43. respectively.

关键词： phytoplankton standing stock primary productivity size-fractionation new production the Southern Ocean

Numerical experiments of HAB inducement in qingdao adjacent coastal area

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Acta Oceanologica Sinica 2010年第5期29卷 109-120页

作者： LIU Xuehai LI Ruixiang YUAN Yeli College of Physical and Environmental oceanography Ocean University of China Qingdao 266100 China first institute of {2. State Oceanic Administration Qingdao 266061 China Key Laboratory of Marine Science and Numerical Modeling State Oceanic Administration First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

A three-dimension ecological dynamic model was established to numerically study the relationship of HAB and environmental *** numerical experiments showed that the growth of diatom,the dominant HAB specie,was mainly restricted by phosphate and *** the concentrations of phosphate and silicate reach 17-2. μg/L and 3.0-3.5 μg/L respectively,the water is in a state of *** phosphate and silicate up to 2.-3.0}μg/L and 3.0-500 μg/L respectively,HAB could be *** major regions of HAB occurrence are Jiaozhou Bay mouth,coastal bays,and coastal area from Maidao to *** avoid HAB occurrence,concentration of phosphate and silicate should not exceed 17-2. μg/L and 3.0 μg/L as a *** control of pollutant discharge is a key point to prevent water eutrophication and HAB occurrence.

关键词： HAB numerical model marine ecosystem dynamics environmental condition

The influence of the surface heat fluxes of the Kuroshio key-area on meiyu rainfall in the Changjiang River region

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Acta Oceanologica Sinica 1991年第1期10卷 73-82页

作者： Ding Liangmo first institute of {2.,{3. oceanic administration,qingdao,China first institute of {2. State Oceanic Administration Qingdao China China

On the basis, of the surface heat fluxes of the Kuroshio key-area (2.°-3.°N, 12.°-3.°E)in March andApril, the climatologicai influence of the Kuroshio heat fluxes on meiyu rainfall in the Changjiang River (Yangtse River) region are studied. The results are concluded as follows;the surface heat fluxes of the Kuroshio key-area have certain influence on meiyu rainfall in the Changjiang River region during June and July. The correctness rates for the five stations in the Changjing River region (i. e. Wuhan, Jiujiang, Anqing,Nanjing and Shanghai)are in the range of 9/2.-13.2.. The surface heat fluxes influence mainly on the homogeneous rainfall pattern,the correctness rates come to 7/10-8/10 for the lower valley of the Changjiang River. The estimation expression of the meiyu rainfall for Shanghai consisting of the surface heat flux and the sea surface temperature anomaly of the Kuroshio key area agrees well with the actual meiyu rainfall condition.

关键词： heat The influence of the surface heat fluxes of the Kuroshio key-area on meiyu rainfall in the Changjiang River region area

A model for wave growth in fetch-limited conditions

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Acta Oceanologica Sinica 1997年第1期16卷 45-56页

作者： Li Luping first institute of {2., {3. oceanic administration, qingdao 2.6003. China first institute of {2. State Oceanic Administration Qingdao 266003 China

In this paper, it is held that the universal relationships of wave growth in fetch-limited conditions , i. e., (f|~) p=A(x|~)-Band (m|~)0= C(x|~) Dshould satisfy the Toba 3.2.power law and the wave energy balance equation. In the ideal generation situation, theoretically it can be derived that the ideal fetch-limited wave growth relationship should have D=3. and D+B =1, (i.e., B = 0.2., D = 0.75 ) and A3.=2. 1×l(T4C^(1/2._d , where Cd is the drag coefficient. The 3.2.power law, the wave energy balance equation and the decrease of wave steepness with increasing fetch have became three requirements which should be satisfied by fetch-limited wave growth algorithms. A semi-empirical and semi-theoretical model for fetch-limited wave growth is presented. In the application to the slanting wind situation an un(?)ersal relationship of dimensionless wave energy vs dimensionless peak frequency is presented and the comparisons show that the model is in good agreement with observations.

关键词： Wave growth fetch-limited wave field universal relationship

An analysis on the formation mechanism of the distributionof high content of chlorophyll-a in the continentalshelf edge waters of East China Sea

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Acta Oceanologica Sinica 1992年第1期11卷 97-107页

作者： Fei Zunle first institute of {2., {3. oceanic administration, qingdao 2.6003. China

On the basis of the data obtained from the comprehensive Kuroshio surveys in 1987-1988,this paper analyses the oceanographic characteristics in the area (12.°-13.° E,2.°-3.° N) of the continental shelf edge of the East China Sea (E. C. S. ) and its adjacent waters and discusses the effects of the Kuroshio front,thermocline and upwelling of the Kuroshio subsurface water on the distribution of standing stock of phytoplankton (chlorophyll-a). The distribution of high content of chlorophylly-a has been detected at 2.-50 in depth in the water body on the left side of the Kuroshio front in the continental shelf edge waters of the E. C. S. The high content of chlorophyll-a spreads from the shelf area to the Kuroshio area in the form of a tongue and connects with the maximum layer of subsurface chlorophyll-a of the Kuroshio and pelagic sea. The author considers that the formation of the distribution of high content chlorophyll-a in this area results from the bottom topography and {3. environment and there are close correlations between the high content of chlorophyll-a and the light-nutrient environment.

关键词： Ph Th An analysis on the formation mechanism of the distributionof high content of chlorophyll-a in the continentalshelf edge waters of East China Sea high

Geochemistry and environment evolution of Core E in the Laizhou Bay since last stage of Middle Pleistocene

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Acta Oceanologica Sinica 2001年第3期20卷 391-399页

作者： Han Deliang, Yu Hongjun, Li Guanbao 1. Ocean University of qingdao, qingdao {2. China {3., state oceanic administration, qingdao 2.6061, China 3. institute of Oceanology. Chinese Academy of Sciences. qingdao 2.6 Ocean University of qingdao Qingdao 266003 China first institute of {2. State Oceanic Administration Qingdao 266061 China institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China

Geochemistry analysis has been done on Core E (3. 07' N, 118 55' E; depth: 82.1 m) taken from the Laizhou Bay in 1994. Nine kinds of invariable elements, 15 kinds of microelements and the content of lime carbonate are measured by means of ICP. The results indicate that most of the invariable elements and microelements in Core E show significant changes in the boundary stratotype, and the ratios between elements (Mn/Fe, Sr/Ba, Ti/Al) in particular. So they can be used as characteristic indicator to stratigraphic division of Quaternary. The changes of invariable elements are primarily controlled by the host minerals, and they mainly indicate the provenance as well as the sedimentation and depositional environment. Several elements, such as Fe, Al, Ca, Mg, Mn and Ti, are very sensitive to the provenance and environment. The distribution of microelements differs in four depositional periods: last stage of Middle Pleistocene, last interglacial period, last glacial period and Recent epoch, and especially in the 'cold period' and 'warm period'. The loops in the cycle curves of the most microelements correspond with the sand bed sediments, among which there are six sand units representing 'warm period' sediments, and one representing 'cold period' sediments. The carbonate is on the high side in the aeolian silt sediments formed in the glacial lowering of sea level in Core E, but on the low side in the transgressive sand beds formed in the interglacial period. The content variation of carbonate has a direct bearing on the grain size and the styles of sediments, and is a good indicator to the climate, environment and stratigraphic division.

关键词： Laizhou Bay last stage of Middle Pleistocene geochemistry paleo-environment element strata