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Radiolarian biogeography in surface sediments of the Northwest Pacific marginal seas

Science China Earth Sciences 2017年第3期60卷 517-530页

作者： LIU Ling ZHANG Qiang CHEN MuHong ZHANG LanLan XIANG Rong South China Sea Institute of Oceanology Chinese Academy of SciencesKey Laboratory of Marginal Sea GeologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100039China Key Laboratory of Marine Mineral Resources Ministry of Land and ResourcesGuangzhou 510075China

Overall abundance and species composition of radiolarian faunas were analyzed in surface sediment samples from representative areas of South China Sea, East China Sea, Sea of Japan, Sea of Okhotsk, Bering Sea, Philippine Sea, and the western boundary current regions of the North Pacific, in order to understand the biogeographic distribution ofradiolarians in the Northwest Pacific and explore its relationship with the main environmental factors and the North Pacific circulation. The results showed that radiolarians in the Northwest Pacific surface sediments can be divided into two large biogeographic provinces---cluster A and cluster B. Cluster A is characterized by the dominance of warm-water species and distributed primarily in tropical and subtropical seas with high radiolarian abundance and diversity; whereas cluster B is predominated by cold water species and distributed mainly in the Arctic and subarctic seas with comparably low abundance and diversity. Cluster A is further divided into five subclusters, AI to A5, which correspond to East China Sea, Philippine Sea, South China Sea, Sea of Japan, and Kuroshio Current, respectively; cluster B is divided into three subclusters, B1 to B3, which correspond to Sea of Okhotsk, Bering Sea, and subarctic gyre area, respectively. Based on the relationships between radiolarian faunas and major environment parameters in different biogeographic provinces, we suggest that the sea surface temperature （SST） and sea surface salinity （SSS） are primary factors that influence productivity, composition, and distribution pattern of the radiolarian fauna in the Northwest Pacific regions, while water depth is likely responsible for regional differences in the radiolarian fauna in each marginal sea. In addition, according to the distribution and abundance patterns of common radiolarian species in different areas, we identified five special radiolarian assemblages, which may be used as indicators for main Kuroshio Current, Kuroshio-East

关键词： Northwest Pacific marginal seas Radiolarian Biogeography North Pacific circulation

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Carbon fluxes in the China seas: An overview and perspective

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Science China Earth Sciences 2018年第11期61卷 1564-1582页

作者： Qian LIU Xianghui GUO Zhiqiang YIN Kuanbo ZHOU Elliott Gareth ROBERTS Minhan DAI State Key Laboratory for Marine Environmental Science Xiamen University

This paper aims to provide an overview of regional carbon fluxes and budgets in the marginal seas adjacent to *** "China seas" includes primarily the South China Sea, East China Sea, Yellow Sea, and the Bohai Sea. Emphasis is given to CO_2 fluxes across the air-sea interface and their controls. The net flux of CO_2 degassing from the China seas is estimated to be9.5±53 Tg C yr^(-1). The total riverine carbon flux through estuaries to the China seas is estimated as 59.6±6.4 Tg C yr^(-1). Chinese estuaries annually emit 0.74±0.02 Tg C as CO_2 to the atmosphere. Additionally, there is a very large net carbon influx from the Western Pacific to the China seas, amounting to ～2.5 Pg C yr^(-1). As a first-order estimate, the total export flux of particulate organic carbon from the upper ocean of the China seas is 240±80 Tg C yr^(-1). This review also attempts to examine current knowledge gaps to promote a better understanding of the carbon cycle in this important region.

关键词： Air-sea CO2 fluxes Marine biogeochemistry marginal seas Ocean carbon cycle China seas

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Recent progress in submarine geosciences in China

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Acta Oceanologica Sinica 2013年第12期32卷 1-3页

作者： JIN Xianglong The Second Institute of Oceanography State Oceanic Administration

In China submarine geosciences represents a newly established discipline of oceanography, focusing on the oceanic lithosphere, and its interface with the hydrosphere and biosphere. Recently, supported by the National High Technology Research and Development Program and other high-tech development projects, significant progress has been made in the development of advanced technologies and equipment. This en- ables the scientists in China to carry out explorations of the international seabed area in the Pacific Ocean and on the Southwest Indian Ridge. In addition, they have been active in the research activities associated the mid-ocean ridges and western Pacific marginal seas. It is anticipated that this research field will continue to be highly fruitful in the near future.

关键词： submarine geosciences submarine resource exploration new technologies in geophysics mid-ocean ridges marginal seas

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