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Present state,basic theories,methods and progresses of investigation and assessment on marine hazardous geology in china

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Acta Oceanologica Sinica 2003年第4期22卷 577-595页

作者： Li Peiying1, Li Ping1, Liu Lejun1, Du Jun1, Zhang Xiaolong1, Wang Shengji2 1. first institute of oceanography,state oceanic administration,qingdao 266061,china 2. institute of Marine Geology,Ministry of Land and Natural Resources,qingdao 266071,china first institute of oceanography State Oceanic Administration Qingdao 266061 China institute of Marine Geology Ministry of Land/Natural Resources Qingdao 266071 China

The achievement progresses of investigation and studies on marine hazardous geology are summarized and presentsd in the late 20 century in china. The importance, research value and present-day studies of marine hazardous geology, a newly developing branch of geoscience, are well expatiated. Several often confused concepts and theories are explained and redefined here. The comment on the means of investigations, assessment of marine hazardous geology, as well as its evolution, innovation, existing questions and future tasks are also introduced and presented. The concepts of 'hazard geology', geohazard', 'map of marine hazard geology', 'integrated evaluaton on seafloor stablity' are respectively discussed, including their definition, research objects, methods and contents. The types and classification of marine hazardous geology, principles and methods of marine hazardous geology map compilation, the assessment methods and models of marine hazardous geology environment and seafloor stability and so on are also discussed.

关键词： ocean hazardous geology geohazard present state of investigation and research basic theories assessment methods progresses

Environmental record from the mud area on the inner continental shelf of the East china Sea since the mid-Holocene

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Acta Oceanologica Sinica 2011年第4期30卷 43-52页

作者： LIU Shengfa SHI Xuefa LIU Yanguang WU Yonghua YANG Gang first institute of oceanography State Oceanic Administration Qingdao 266061 China Key Laboratory of Marine Sedimentology and Environmental Geology State OceanicAdministration Qingdao 266061 China

Paleoclimate record was revealed in Core MZ01 covering the mid-Holocene in age,located in the mud area of the inner continental shelf of the East china Sea. The ancient environment featured low-energy shallow sea shelf deposition formed mainly by coastal currents. The results show that temporal variation in geochemistry corresponds with the climate changes inferred from historical record. Relatively low MgO/Al 2 O 3,CaO/K 2 O and high Al 2 O 3 /Na 2 O,K 2 O/Na 2 O,MnO/CaO values reflected a warm and humid climate in general,and vice versa. Therefore,these chemical indices could be applied to identify the variation of palaeoclimate in eastern china. The authors reconstructed the history of mid-Holocene climatic variation of the inner continental shelf of the East china Sea. From 8 300 a BP to 4 200 a BP,the climate was moderately warm and humid. From 4 200 a BP to 2 000 a BP,the climate turned cool and dry,and the regional climate frequently fluctuated in alternation of cool-dry periods（3 700 a BP,2 850 a BP and 2 400 a BP） and warm-wet periods（3 250 a BP and 2 650 a BP） . After 2 000 a BP,the climate of the study area gradually turned warm again,while the Little Ice Age,a cold event centered at around 250 a BP was indicated by those geochemical indices as mentioned above.

关键词： Holocene East china Sea mud area major element palaeoclimate East Asia monsoon

Existing states of copper in the hydrothermal activity area of the Middle Okinawa Trough

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Chinese Science Bulletin 1999年第S2期44卷 244-246页

作者： GAO Aiguo first institute of oceanography, state oceanic administration, Qingdno 266003, china first institute of oceanography State Oceanic Administration Qingdao 266003 China

THERE are four submarine hydrothermal activity areas in the Middle Okinawa Trough. They are Izena hole(127°05’E, 27°16’N), Iheya Deep (126°58’E, 27°33’N). Natsushima 84-1 Mound (127°08.6’E, 27°34.4’N), Western mount of Tokunoshima island (127°39’E, 37°52’N), respectively. In an attemptto determine the influence of the Middle Okinawa Trough area hydrothermal activity on copper distributionin the surrounding sediments, 8 surface samples and 6 core samples collected from this area were analyzedfor sequential extraction procedure and bulk analyses. 1 Samples and method Sediment samples were collected at 8 stations by dredger or piston corer (table 1). The sampleswere stored at200 meshes in an agate *** leaching procedures developed by Tessler were modified as follows: Cu (1) was ex-

关键词： copper hydrothermal activity Middle Okinawa Trough.

Energy budget of surface waves in the global ocean

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Acta Oceanologica Sinica 2009年第3期28卷 5-10页

作者： TENG Yong YANG Yongzeng QIAO Fangli LU Jing YIN Xunqiang first institute of oceanography State Oceanic Administration Qingdao 266061 China Key Laboratory of Marine Science and Numerical Modeling State Oceanic Administration Qingdao 266061 China

Mechanical energy input from atmosphere and losses from wave-breaking dissipation of sea surface waves are estimated by a direct scheme. This scheme is based on the integration in the wavenumber space of the wind input and breaking dissipation source functions of the MASNUM wave model. The global amount of wind energy input, averaged in 2005, is about 57 TW, and the wave-breaking dissipation summed in deep-water is about 33 TW, over a half of the wind energy input. The residual may be dissipated by beach processes. Global distributions of the energy input and breaking dissipation concentrate in the westerlies of the Southern Hemisphere.

关键词： wind energy input wave-breaking dissipation source function

Morphological characteristics in the area off eastern Taiwan Island and their tectonic implications

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Acta Oceanologica Sinica 2004年第3期23卷 449-461页

作者： LIUBaohua ZHENGYanpeng WUJinlong HANGuozhong ZHANGDeyu firstinstituteofoceanography StateOceanicAdministrationQingdao266061China KeyLaboratoryofMarineSedimentologyandEnvironmentalGeologyofstateoceanicadministration Qingdao2660061China

On the basis of bathymetric data and other geological and geophysical data obtained during the first survey conducted by Chinese Mainland in the area off eastern Taiwan Island from May to June in 2000, the morphological features of the region, the tectonic control to the seafloor topography and their tectonic implication are studied and discussed. The results have revealed that both the slope zone of the Ryukyu arc and the Ryukyu Trench present a typical morphotectonic characteristics controlled by the trench-arc system in the West Pacific Ocean. At the slope of eastern Taiwan Island the isobathic lines parallel to the coastline and distribute densely in nearly N-S direction and the slope gradient of topography is large. Such a unique feature is attributed to the collision of the Luzon arc and Eurasia continent. In the Huatung Basin, turbidity fans and submarine canyons are well developed, the formations of which are mainly related to the steep topography of the slope of the Luzon arc and the abundant supply of sediments. These submarine canyons are controlled by basement highs and strike-slip faults. On eastern side and western side of the Gagua Ridge, both the water depth and morphological features are different, but the basement of Gagua Ridge belongs to the Huatung Basin. The eastern side of the Gagua Ridge (123°12′E) corresponds to the boundary of two plates with different ages. In the West Philippine Basin, linear ridges and troughs in a NW trending are identified, which are dissected by a NE trending transform fault. According to the seafloor topography features, the direction of the transform fault and the magnetic anomaly lineations, the seafloor of this region was formed during 60-45 Ma B. P. when the West Philippine Basin was spreading along NE-SW relative to the present orientation.

关键词： Taiwan Island morphological characteristics tectonic implications

The effects of sediment from an industrial outfall area on a marine planktonic ecosystem

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Acta Oceanologica Sinica 1990年第1期9卷 151-158页

作者： Wu Jinping Third institute of oceanography, state oceanic administration, Xiamen, china

-Sediment from Xiamen industrial area was added to marine ecosystem enclosures to test the effects on the planktonic communities in Xiamen Bay, china, in April, 1985. Sediments were added at two concentrations, 11.2 and 112 ppm dry wt. respectively. The species of phytoplankton did not change as compared with the control, but the number of diatoms markedly decreased in the sediment treated enclosures. A suppression of photosynthesis was presumed to be due to light attenuation by the added sediment. Microflagellates, zooplankton and bacteria were resistant to sediment increase in water column.

关键词： The effects of sediment from an industrial outfall area on a marine planktonic ecosystem area

The distribution of Euphausiacea in the western Taiwan Strait

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Acta Oceanologica Sinica 1991年第3期10卷 467-470页

作者： Cai BingjiThird institute of oceanography, state oceanic administration, Xiamen, china

The present paper reports the species composition and quantitative distribution of the Euphausiacea. The materials for study were taken from the western Taiwan Strait (22°22. 9′～25°43. 0′ N;116°40.0′～120°30.0′E) by the Third institute of oceanography, state oceanic administration during the investigations in May, August, November, 1984 and February, 1985.

关键词： Eu

A study on the source of the Tsushima Warm Current water

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Acta Oceanologica Sinica 1991年第3期10卷 341-353页

作者： Song Wanxian, Lin Kui and Guo Binghuo first institute of oceanography, state oceanic administration, qingdao, 266003, china

On the basis of the hydrographic data in the area west of Kyushu from four cruises of R/V Xiangyanghong No. 9 from 1987 to 1988 , the circulation features in the investigation area are described and the source of the Tsushima Warm Current water (TWCW) is explored by using the observed and geostrophic current results and tracking the Kuroshio Subsurface High Salinity Core (KSHSC).

关键词： A study on the source of the Tsushima Warm Current water

Influences of the surface wave-induced mixing and tidal mixing on the vertical temperature structure of the Yellow and East china Seas in summer

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Progress in Natural Science:Materials International 2006年第7期16卷 739-746页

作者： QIAO Fangli, MA Jian, XIA Changshui, YANG Yongzeng and YUAN Yeli (Key Laboratory of Marine Science and Numerical Modeling, first institute of oceanography, state oceanic administration, qingdao 266061, china) state Ocean Adm Inst Oceanog 1 Key Lab Marine Sci & Numer Modeling Qingdao 266061 Peoples R China

After a classification of the physical processes which affect the vertical mixing, diffusivity induced by the surface wave momentum and tidal currents and its influence on the vertical temperature structure are discussed. Based on three mixing schemes, the vertical temperature structure of the Yellow and East china Seas (YECS) is simulated. Results show that in summer, the surface wave-induced mixing plays a key role in forming the upper mixed layer in the YECS. The tidal mixing controls the lower layers within 30 m above the bottom, which is the main factor in forming the platform-shaped temperature structure in the southern Yellow Sea (YS). Together with the strong surface wave-induced mixing, the tidal mixing makes the thermocline ventilate near the east coast of the southern YS. The double cold cores in the deeper layers of the East china Sea have different causes. The western one is the maintenance of the winter cold water, while the eastern one is configured by circulation. The simulated vertical temperature structure of the YECS with the surface wave-induced mixing and tidal mixing has similar features to the observations, which indicates that these mixing processes are key factors in simulating the thermocline and pycnocline of the coastal oceans.

关键词： surface wave-induced mixing tidal mixing thermocline the Yellow Sea the East china Sea.