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ASSIMILATION OF ALTIMETER WIND DATA IN MESOSCALE NUMERICAL MODEL (MM5)

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Journal of Hydrodynamics 2001年第3期13卷 49-56页

作者： Ma, Yan Zhang, Qing-Hua Qu, Yuan-Yuan first Inst. of oceanography State Oceanic Administration Qingdao 266061 China

Making use of altimeter wind data and standard sounding data in a mesoscale numerical model of PSU/NCAR (MM5), we test four-dimensional data assimilation scheme based on nudging. The purpose of this paper is to determine what meteorological fields and what assimilation method have positive effect on typhoon sea surface wind by simulating two typhoon cases in MM5. We perform seven experiments for 9608 Typhoon (Case 1): one control experiment, three analysis nudging experiments, two observation nudging experiments and one analysis and observation nudging experiment; we perform one control experiment and one analysis nudging experiment for 9711 Typhoon (Case 2). The results show assimilating wind-thermal fields can effectively improve simulation accuracy of the model; the experiment combining standard sounding data and surface observations can improve greatly the simulation accuracy of the model; the altimeter data contain lots of sea surface information and also have positive impact on typhoon sea surface wind.

关键词： Data processing Numerical analysis Statistical methods Wind

Assessment of introduced Kappaphycus (Solieriaceae, Rhodophyta) species relationships in China with molecular markers

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Acta Oceanologica Sinica 2013年第2期32卷 59-65页

作者： LIU Chenlin HUANG Xiaohang LIU Jianguo Marine Ecological Center The First Institute of OceanographyState Oceanic Administration institute of Oceanology the Chinese Academy of Sciences

Due to morphological plasticity and paucity of diagnostic morphological characters, the taxonomy of Kap- paphycus gets more and more confused with the expanding of commercial cultivation. In this study, the phylogenetic relationship of 13 strains of introduced Kappaphycus species in China was defined using DNA molecular markers, such as 18S rDNA, rbcL and cox2-cox3 spacer region. The resolutions obtained by three different molecular markers were compared： both cox2--cox3 spacer region and rbcL sequences are eligible in inter- species identification of Kappaphycus, whereas cox2-cox3 spacer region is more variable than rbcL sequence. There is several basepairs＇ discrepancy among 18S rDNA sequences, while it is 100% identical among both cox2-cox3 spacer region and rbcL sequences of the ten strains of K. alvarezii. We suppose that 18S rDNA sequence can provide more information in biogeography study of Kappaphycus than other two DNA sequences.

关键词： 18S rDNA, cox2-cox3 spacer region, molecular marker, Kappaphycus rbcL

A spatial resolution effect analysis of remote sensing bathymetry

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Acta Oceanologica Sinica 2017年第7期36卷 102-109页

作者： LIANG Jian ZHANG Jie MA Yi Dalian Maritime University Information Science and Technology College The first institute of oceanography State Oceanic Administration

A spatial resolution effect of remote sensing bathymetry is an important scientific problem. The in situ measured water depth data and images of Dongdao Island are used to study the effect of water depth inversion from different spatial resolution remote sensing images. The research experiments are divided into five groups including Quick Bird and World View-2 remote sensing images with their original spatial resolution（2.4/2.0 m）and four kinds of reducing spatial resolution（4, 8, 16 and 32 m）, and the water depth control and checking points are set up to carry out remote sensing water depth inversion. The experiment results indicate that the accuracy of the water depth remote sensing inversion increases first as the spatial resolution decreases from 2.4/2.0 to 4, 8 and16 m. And then the accuracy decreases along with the decreasing spatial resolution. When the spatial resolution of the image is 16 m, the inversion error is minimum. In this case, when the spatial resolution of the remote sensing image is 16 m, the mean relative errors（MRE） of Quick Bird and World View-2 bathymetry are 21.2% and 13.1%,compared with the maximum error are decreased by 14.7% and 2.9% respectively; the mean absolute errors（MAE） are 2.0 and 1.4 m, compared with the maximum are decreased by 1.0 and 0.5 m respectively. The results provide an important reference for the selection of remote sensing data in the study and application of the remote sensing bathymetry.

关键词： remote sensing spatial resolution water depth remote sensing inversion

The magnetic properties of sediment and sedimentary environment in the Huanghe Delta area after the last glacial maximum

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Acta Oceanologica Sinica 2016年第5期35卷 113-123页

作者： PENG Jun LI Ping CHEN Hongquan School of Urban and Planning Yancheng Teacher's University first institute of oceanography State Oceanic Administration

On the basis of measuring the magnetic parameters of sediment in Core YDZ1, combined with a grain size analysis and Carbon-14 dating, the magnetic properties of sediment and sedimentary environment in the Huanghe（Yellow River） Delta area after the last glacial maximum have been studied. The results show that the ferrimagnetic minerals of a pseudo single domain and multi domain particles dominate the magnetic properties of sediment in Core YDZ1. The imperfect anti ferrimagnetic minerals have more contribution on sediment in a depth of 24.0–22.1 m, and more stable-single domain and pseudo single domain particles exist. The susceptibility of anhysteretic remanent magnetization and the ratio of the susceptibility of anhysteretic remanent magnetization to saturation isothermal remanent magnetization show a decrease trend below depth of 24 m, a marked increase trend in a depth of 24.0–13.5 m, and a rapid decrease at depth of 13.5 m, then a fluctuation trend upward. The above two magnetic parameters and the ratio of the susceptibility of anhysteretic remanent magnetization to the mass susceptibility can be regarded as the proxy indicators for the content of clay（〈4 μm）and the fine-grained size（〈32 μm）. The sedimentary environment after the last glacial maximum in the Huanghe Delta area has experienced the fluvial facies, the tidal flat facies, the neritic facies, the pro delta facies, the delta front facies and the floodplain facies. Thickness of the Holocene transgression layer is 10.5 m and the depth of substrate is about 24 m according to the YDZ1 core. The sedimentary dynamic has a variation trend with strongweak-strong, which has been proved by the Flemming triangular schema.

关键词： the Huanghe(Yellow River) Delta magnetic properties sedimentary environment grain size dating

Sea ice thickness estimation in the Bohai Sea using geostationary ocean color imager data

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Acta Oceanologica Sinica 2016年第7期35卷 105-112页

作者： LIU Wensong SHENG Hui ZHANG Xi Shool of Geosciences China University of Petroleum (East China) first institute of oceanography State Oceanic Administration

A method to estimate the thickness of the sea ice of the Bohai Sea is proposed using geostationary ocean color imager （GOCI） data and then applied to the dynamic monitoring of the sea ice thickness in the Bohal Sea during the winter of 2014 to 2015. first of all, a model is given between the GOCI shortwave broadband albedo and the reflectance of each band with high temporal resolution GOCI data. Then, the relationship model between the sea ice thickness and the GOCI shortwave broadband albedo is established and applied to the thickness extraction of the sea ice in the Bohai Sea. Finally, the sea ice thickness extraction method is tested by the results based on the MODIS data, thermodynamic empirical models （Lebedev and Zubov）, and the in situ ice thickness data. The test results not only indicated that the sea ice thickness retrieval method based on the GOCI data was a good correlation （r2〉0.66） with the sea ice thickness retrieved by the MODIS and thermodynamic empirical models, but also that the RMS is only 6.82 cm different from the thickness of the sea ice based on the GOCI and in situ data.

关键词： sea ice thickness geostationary ocean color imager Bohai Sea

The characteristics of consolidation settlement and its contribution to the topographical change in the northern modern Huanghe River subaqueous delta in China

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Acta Oceanologica Sinica 2015年第9期34卷 136-142页

作者： LIU Jie LI Ping LIU Xiao XU Yuanqin GAO Wei first institute of oceanography State Oceanic Administration College of Environmental Science and Engineering Ocean University of China

The sediments of the modern Huanghe River subaqueous delta are easily to generate settlement and lead to topography change which is due to fast deposition rate, high void ratio, moisture content and compressibility. The sediment consolidation settlements and its contribution to the topography change in the northern modern Huanghe River subaqueous delta are studied based on drilling data, laboratory experiment results, and water depth measurements of different time. The results show that the final consolidation settlement of drill holes in the study area is between 1.17 and 3.21 m, and mean settlement of unit depth is between 2.30 and 5.30 cm/m based on the one-dimensional consolidation theory and Plaxis numerical model. The final consolidation settlement obtained by Plaxis numerical model is smaller than that obtained by the one-dimensional consolidation theory, and the difference is 3.4%-39.9% between the methods. The contribution of the consolidation settlement to the topographical change is at 20.2%-86.6%, and the study area can be divided into five different regions based on different contribution rates. In the erosion area, the actual erosion depth caused by hydrodynamics is lower than the changes of measured water depth, however, the actual deposition amount caused by hydrodynamics is much larger than the changes of water depth obtained by measured data in the equilibrium and deposition areas.

关键词： sediment consolidation water depth variation morphological effect core analysis northern HuangheRiver subaqueous delta

Phenylquinolinones with antitumor activity from the Indian Ocean-derived fungus Aspergillus versicolor Y31-2

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Chinese Journal of Oceanology and Limnology 2016年第5期34卷 1072-1075页

作者：李培海樊亚琴陈颢晁雅熙杜宁陈军辉 Key Lab of Marine Bioactive Substances First Institute of OceanographyState Oceanic Administration(SOA)

Two phenylquinolinones,including one new compound(1) and a previously isolated compound(2),were isolated from the ethyl acetate extracts of the fungus Aspergillus versicolor Y31-2,which was obtained from seawater samples collected from the Indian *** structures of these compounds were established by spectroscopic analyses.4-(3-Hydroxyphenyl)-3-methoxyquinolin-2(1H)-one(1) exhibited moderate cytotoxicity against MCF-7(human breast carcinoma cell line) and SMMC-7721(human liver cancer cell line) cells with IC_(50) values of 16.6 and 18.2 μmol/L,*** the best of our knowledge,this study represents the first reported account of the isolation of compounds 1 and 2 as the secondary metabolites of the seawater derived fungus Aspergillus versicolor from the Indian Ocean.

关键词： phenylquinolinones anti-tumor Aspergillus versicolor

SIMULATION STUDY OF IMAGING OF UNDERWATER BOTTOM TOPOGRAPHY BY SYNTHETIC APERTURE RADAR

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Journal of Hydrodynamics 2001年第3期13卷 57-64页

作者： Ma, Yi Zhang, Jie first Inst. of oceanography State Oceanic Administration Qingdao 266061 China

Interaction between current and underwater bottom topography modulates roughness of the sea surface, which in turn yields variation of the radar scattering echo. By using the mechanism, this paper presents a simulation model for Synthetic Aperture Radar (SAR) imaging of underwater bottom topography. The numerical simulations experiments were made using the Princeton Ocean Model (POM) and analytical expression theory of SAR Image in Mischief sea area. It is concluded that the SAR image is better visual when water depth of underwater bottom topography is shallow or gradient of underwater bottom topography is high.

关键词： Numerical analysis Ocean currents Simulation Synthetic aperture radar Underwater imaging Underwater structures

The morphological identification of Protoperidinium(Peridiniales, Dinophyceae) species on the coasts of China

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Acta Oceanologica Sinica 2016年第4期35卷 108-117页

作者： LI Ruixiang PAN Yulong SUN Huiying LI Yan MA Xin WANG Yan Key Laboratory of Science and Engineering for Marine Environment First Institute of OceanographyState Oceanic Administration North China Sea Environment Monitoring Center State Oceanic Administration College of Marine Sciences Shanghai Ocean University Marine Environment Monitoring Center Station of Qinhuangdao State Oceanic Administration Marine Information and Computing Center First Institute of OceanographyState Oceanic Administration

The classification and identification for Protoperidinium species are the most difficult work during its taxonomic study. In this research, taxonomic status of Protoperidinium was clarified by tracing its taxonomic history, 23 species belong to genus Protoperidinium on the coasts of China were preliminarily identified, and morphological description and plate patterns were given for each species. The key differences of similar species were also discussed in this study, we believe that P. oceanicum and P. murry, P. tumidum and P. fatulipes, P. globules and *** are separate species; P. diabolum should be treated as the valid name instead of the reported names Peridinium globosum or Peridinium longipes; the taxonomic relationship between P. punctulatum and *** requires further study.

关键词： coasts of China Protoperidinium morphological identification