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Acta Oceanologica Sinica 2005年第3期24卷 68-77页

作者： XUMaoquan SUNMeiqin XUWenbin LIChao departmentofoceanography InstituteofSubtropicalOceanographyXiamenUniversityXiamen361005China

The composition, assemblage and distribution characteristics of heavy minerals from 63 to 125 μm grain sizes in surface sediment from the Xinghua Bay (17 stations) are studied. The matter source of silt and the relationship between heavy minerals and sedimentary environment are also discussed. The results show that there are 37 kinds of heavy minerals and the average content of them is 12.08%, which exceeds 6% compared with the Meizhou Bay (5.67%). The dominant minerals are magnetite, hornblende, epidote, ilmenite, hematite, limonite, zircon and so on. Mineral kinds reveal that the sources of silt in this bay are the fluvial input and eroded products of bedrock in circumjacent land and islands of the Xinghua Bay. However, the matter source from outside this bay is less. Four mineral assemblage zones can be divided based on heavy mineral contents and distribution characteristics in the Xinghua Bay, which are not only influenced by matter source, but also controlled by hydrodynamic condition and sedimentary environment in the Xinghua Bay.

关键词： heavyminerals mineral assemblage sedimentaryenvironment Xinghua BayofFujian

A potential source of recruitment of Acartia pacifica nauplii: viable benthic resting eggs

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Acta Oceanologica Sinica 2005年第2期24卷 151-158页

作者： WANGGulzhong JIANGXiaodong LIShaojing WULisheng WUDingxun departmentofoceanography InstituteofSubtropicalOceanographyKeyLaboratoryforMarineEnvironmentalScienceoftheMinistryofEducationXiamenUniversityXiamen361005China

Many estuarine and coastal planktonic copepods depend on the hatching of benthic resting eggs for recruitment of nauplii to the water column population. The distribution and abundance of viable resting eggs of Acartia pacifica in the Xiamen Bay were determined by the presence of nauplii in the laboratory. The number of viable eggs var/ed temporally and spatially. The maximum number (9.2×10^4m^-2) of viable eggs was in summer. In spring the average abundance of viable eggs was 5.6×10^4 m^-2. The abundances of viable eggs in fall and winter were similar, respectively 2.7×10^4 and 3.3×10^4m^-2, which were the lowest in the year. The numbers of viable eggs inside the stations of the Xiamen Bay were higher than those outside the stations. The viable eggs were found at all depths (0-10 cm),although not in every station. The maximum number did not necessarily occur in the uppermost centimeter of the sediments but often occurred several centimeters below the water-sediment interface. The accumulation of viable eggs in the seabed of a subtropical bay constitutes a potential source of recruitment of nauplii into the pelagic population.

关键词： recruitment resting eggs Acartia pacifica

Distribution and composition characteristics of heavy minerals in surficial sediment of Minjiang Estuary

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Acta Oceanologica Sinica 2005年第3期24卷 86-93页

作者： XUMaoquan XUWenbin SUNMeiqin departmentofoceanography XiamenUniversityXiamen361005China departmentofoceanography XiamenUniversityXiamen361005China／／InstituteofSubtropicalOceanographyXiamenUniversityXiamen361005China

Heavy minerals with a size range of 0.125￣0.250 mm in the surficial sediment of Minjiang Estuary are studied. Thirty-four heavy min- erals have been identified, with an average content of 1.92%. Major minerals include magnetite, epidote, hematite, hornblende, il- menite, and zircon mica. These types are the same as those in the 0.063￣0.125 mm range; however, the average content is lower, which reveals that the heavy minerals in Minjiang Estuary are mainly enriched in the very-fine sand fraction. According to the content and distribution characteristics of the major heavy minerals, Minjiang Estuary can be divided into 4 mineral assemblage zones. In each zone the assemblage of heavy minerals is greatly affected by the hydrodynamic condition and the sedimentary environment. Heavy mineral types also show that detrital matters in Minjiang Estuary are originated from the weathering and erosion of the bedrock in the Minjiang River drainage area.

关键词： heavymineral distribution characteristics sedimentation origin ofmatter Minjiang Estuary

Study of chemical forms of phosphorus and their bioavailability in the sediments

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Acta Oceanologica Sinica 2004年第2期23卷 317-327页

作者： ZHENGAirong SHENHaiwei LIWenquan departmentofoceanography／instituteofsubtropicaloceanography XiamenUniversityXiamen361005China GraduateSchoolofOceanography UniversityofRhodeIslandNarragansett02882USA

Chemical forms of phosphorus in the sediments of the Daya Bay, the Zhujiang River estuary , and the Xiamen Bay are measured with extraction solutions of MgCl2, NaOH, and HC1. Their availabilities to Chlorella sp. and Isochrysis galbana are estimated by using sediments as the sole source of P in the bioassays. The results show that the contents of total phosphorus (TP) in these sediments are 449.3, 650.1 and 643.9 mg/kg, respectively. The contents of non-apatite inorganic P (NAIP) extracted with MgCl2 and NaOH from 3 sediments are 168.8, 146.6 and 118.1 mg/kg, respectively, and account for 18.3% -32.6% of TP. The phosphorus extracted with HC1 solution is greater than that extracted with NaOH solution and the lowest extracted P is MgCl2-extractable P. The greatest relative growth rates of Chlorella sp. and Isochrysis galbana cultured with sediments are in the range of 4.3% -26.9%. The increasing biomasses of these algae correspond to NAIP and AAPP (the estimated algal-available particulate P). AAPP accounts for 42.4% -78.2% of NAIP, 21.1 % - 27.1% of total inorganic P, and 11.8% - 20.3% of TP, respectively.

关键词： chemical forms phosphorus bioavailability,sediment

Distribution pattern of marine flagellate and its controlling factors in the central and north part of the Huanghai Sea in early summer

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Acta Oceanologica Sinica 2003年第2期22卷 273-280页

作者： HuangLingfeng GuoFeng HuangBangqin XiaoTian departmentofoceanography&instituteofsubtropicaloceanography XiamenUniversityXiamen361005China EnvironmentalScienceResearchCenter KeyLaboratoryforMarineEnvironmentalScienceofMinistryofEducationXiamenUniversityXiamen361005China InstituteofOceanography ChineseAcademyofSciencesQingdao266071China

A survey was carried out in the central and north part of the Huanghai Sea (34.5° -37.0°N, 120.5°-124.0°E) during June 12-27, 2000. It was found that the abundance of marine flagellate ranged from 45 to 1 278 cell/ml, 479 cell/ml in average. Flagellate was more abundant in the central part than in the north part of Huanghai Sea, and the abundance decreased with the increasing distance from the coast, showing a similar distribution pattern with isotherm. Vertically, high density of flagellate was always presented in the bottom of thermocline, and formed a dense accumulation in the central area of the Huanghai Sea Cold Water Mass. The effects of physical and biological factors on the distribution of marine flagellate in early summer were discussed. Water temperature (especially the existence of thermocline) rather than salinity showed significant effect on the distribution pattern of marine flagellate in the Huanghai Sea in early summer. When comparing the abundance of marine flagellate with that of other microorganisms, it revealed a comparatively stable relationship among these organ-hisms, with a ratio of heterotrophic bacteria: cyanobacteria: flagellate: dinoflagellate: ciliate being 105 :103:102:101:100.

关键词： Marine flagellate distribution controlling factors early summer the Huanghai Sea

A survey on Anthomedusae (Hydrozoa: Hydroidomedusae) from the Taiwan Strait with description of new species and new combinations

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Acta Oceanologica Sinica 2004年第3期23卷 549-562页

作者： XUZhenzu HUANGJiaqi departmentofoceanography XiamenUniversityXiamen361005China

New data on Anthomedusae are included. Seven new species and 2 new combinations are described. An additional Teissiera polypofera Xu, Huang and Chen, 1991 is redescribed and its position of taxonomy is discussed. Othe... 详细信息

关键词： Anthomedusae, taxonomy Bougainvillidae, Pandeidae, Protiaridae, Tessieridae, Zancleidae

Abundance and distribution of dinoflagellate cysts in Xiamen Western Harbor

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Acta Oceanologica Sinica 2004年第2期23卷 347-357页

作者： CAOWenqing LINYuanshao FANGLuping departmentofoceanography XiamenUniversityXiamen361005China

In a grid investigation, dinoflagellate cysts were collected from sediments in Xiamen Western Harbor in May of 2000, from which five species of cysts were identified: Alexandrium tamarensis, A. minutum, Lingulodinium polyedra, Gonyaulax scrippsae and Gymnodinium catenatum, account for about 21% in the species composition. The quanti-tative analysis of the sediments shows that the number of dinoflagellate cysts varies from 51 to 256 cysts/g of sediment, the highest value (>200 cysts/g) being recorded at the stations of the central part of the bay, while the lowest (<100 cysts/g) at the bay mouth. A good linear relationship is found between cyst amount and fine-grained sediments. Complex physiognomies on the seabed, topographty in the bay and weak water exchange are the main factors not only in cyst accumulation but also in their distribution pattern, and have resulted in the difference in cyst densities between the inner bay and the outer bay in the harbor.

关键词： dinoflagellate cysts abundance distribution Xiamen

The seasonal variation of undercurrent and temperature in the equatorial Pacific jointly derived from buoy measurement and assimilation analysis

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Acta Oceanologica Sinica 2004年第1期23卷 51-60页

作者： SUNJilin CHUPeter LIUQinyu Ocean-AtmosphereInteractionandClimateLaboratory OceanUniversityofChinaQingdao266003China departmentofoceanography NavalPostgraduateSchoolMontereyU.S.A.

Based on the TOGA-TAO buoy chain observed data in the equatorial Pacific and the assimilation analysis results from SODA(simple ocean data assimilation analysis), the role of the meridional cells in the subsurface of the tropical Pacific was discussed. It was found that, the seasonal varying direction of EUC(the quatorial Undercurrent)in the Peacific is westwards beginning from the eastern equatorial Pacific in the boreal spring. The meridional cell south of the equator plays important role on this seasonal change of *** the other hand, although the varying direction is westwards, the seasonal variation of temperature in the same region gets its minimum values in the boreal autumn beginning from the eastern equatorial *** meridional cell north of the equator is most responsible for the seasonal temperature variation in the eastern equatorial Pacific while the meridional cell south of the equator mainly controls the seasonal temperature change in the central Pacific. It is probably true that the asymmetry by the equator is an important factor influencing the seasonal cycle of EUC and temperature in the tropical Pacific.

关键词： the tropical Pacific Equatorial Undercurrent seasonal variations meridional cell

Detection of cyclonic eddy generated by looping tropical cyclone in the northern South China Sea: a case study

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Acta Oceanologica Sinica 2004年第2期23卷 213-224页

作者： HUJianyu KAWAMURAHiroshi KeyLaboratoryofMarineEnvironmentalScienceofMinistryofEducation instituteofsubtropicaloceanography XiamenUniversityXiamen361005China CenterforAtmosphericandOceanicStudies FacultyofScienceTohokuUniversitySendai980-8578Japan

A case study on the cyclonic eddy generated by the tropical cyclone looping over the northern South China Sea (NSCS) is presented, using TOPEX/POSEIDON altimeter data and AVHRR sea surface temperature (SST) data. Three cases relating to the tropical cyclone events (Typhoon Kai-Tak in July 2000, Tropical Storm Russ in June 1994 and Tropical Storm Maria in August-September 2000) over the NSCS have been analyzed. For each looping tropical cyclone case, the cyclonic eddy with an obvious sea level depression appears in the sea area where the tropical cyclone takes a loop form, and lasts for about 2 weeks with a slight variation in location. The cold core with the SST difference greater than 2℃against its surrounding areas is also observed by the satellite-derived SST data.

关键词： cyclonic eddy looping tropical cyclone northern South China Sea TOPEX/POSEIDON altimeter data

Temporal and spatial variabilities of sea surface heights in the northeastern South China Sea

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Chinese Science Bulletin 2004年第5期49卷 491-498页

作者： LIYanchu LILi JINGChunshen CAIWenli TheThirdInstituteofOceanography StateOceanicAdministrationXiamen361005China departmentofoceanography XiamenUniversityXiamen361005China

Analyses of sea surface height anomalies (SSHA) from Jan. 1993 to Dec. 2001 measured by TOPEX/Poseidon (T/P) satellite altimetry indicate that there are two energy highs of SSHA fluctuations on both sides of the Luzon Strait. The highs centered at (19.5° N, 119.5° E) and (22.0° N,124.0° E) respectively, are separated by a low energy band in the Strait. Empirical Orthogonal Function (EOF) analysis on the "Far Field" suggests that fluctuations of these two areas are mutually independent. EOF analysis on the "Near Field" shows that SSHA oscillation in the northeastern South China Sea (SCS) is dominated by seasonal variations accompanied with significant intra-seasonal and inter-annual fluctuations. Among which, EOF1 and EOF2 reflect 66.7% of the total variance. They are both seasonal but showing three months difference in phase. The basic pattern of EOF1 appears to be the seasonal SSHA oscillation centered at (18.0° N, 119.0° E) northwest off Luzon Island, which shows maximums (minimums) in August/September (January/February) and mainly reflects the seasonal variation of steric heights of the deep SCS basin and its corresponding circulation adjustments. The basic pattern of EOF2 is featured by seasonal seesaw of sea surface elevation in the SE-NW direction, which imaged the Ekman adjustment of sea surface height (SSH) in the northeastern South China Sea (NESCS) driven by the monsoons. Our analyses also reveal that intra-seasonal variation is an important component of SSHA fluctuation of the NESCS, which reflects the frequent occurrence of mesoscale processes west to the Luzon Strait. Moreover, inter-annual variations appear in all major EOF modes.

关键词：海平面高程异常南中国海东北地区