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Concentrations and sinking rates of transparent exopolymer particles(TEPs)in a coastal sea:the Changjiang River(Yangtze River)Estuary

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Acta Oceanologica Sinica 2020年第10期39卷 58-69页

作者： Shujin Guo Jun Sun College of Marine Science and Technology China University of Geosciences(Wuhan)Wuhan 430074China Jiaozhou Bay Marine Ecosystem Research Station Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Transparent exopolymer particles(TEPs)are ubiquitous throughout the oceans,and their sedimentation is considered an efficient biological carbon sink *** investigate the role of coastal TEPs in sinking carbon from the upper layer,samples were collected in the spring and summer of 2011 in the Changjiang River(Yangtze River)Estuary,a typical coastal *** concentrations and sinking rates of TEPs were measured,and potential sedimentation flux of TEPs was *** concentrations ranged from 40.00μg/L to 1040.00μg/L(mean=(209.70±240.93)μg/L)in spring and 56.67μg/L to 1423.33μg/L(mean=(433.33±393.02)μg/L)in summer,and they were higher at bloom stations than at non-bloom stations during both cruises.A significant positive correlation between TEPs concentration and chlorophyll a(Chl a)concentration was detected,suggesting that phytoplankton was the primary source of TEPs in this *** sinking rates ranged from 0.08 m/d to 0.57 m/d with a mean of(0.28±0.14)m/d in spring and 0.10 m/d to 1.08 m/d with a mean of(0.34±0.31)m/d in *** potential sedimentation flux of TEP-C ranged from 4.95 mg/(m2·d)to 29.40 mg/(m2·d)with a mean of(14.66±8.83)mg/(m2·d)in spring and 6.80 mg/(m2·d)to 30.45 mg/(m2·d)with a mean of(15.71±8.73)mg/(m2·d)in summer,which was^17.81%to 138.27%(mean=65.15%±31.75%)of sedimentation flux of phytoplankton cells in the study *** to the increase of TEPs concentrations and their sinking rates,sedimentation fluxes of TEPs at the bloom station were obviously higher than at the non-bloom station during both *** study indicates that TEPs serve as a carbon sink in the Changjiang River Estuary,especially during bloom events,and their sedimentation should be taken into account when we study the carbon sedimentation in the coastal sea.

关键词： transparent exopolymer particles sinking rates Changjiang River(Yangtze River)Estuary coastal sea

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ON FORMATION OF TIDAL FRONTS IN coastal seaS

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Journal of Hydrodynamics 1998年第3期10卷 17-28页

作者： Wang Xiao-huaDepartment of Geography and Oceanography, University College, Australian Defence ForceAcademy, Canberra ACT 2600, Australia, Email :h-wang @ adfa.oz. auM. L. HeronPhysics Department, James Cook University Townsville, Q 4811, AustraliaChen WeiThe Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012,P. R. China Australian Defence Force Acad Canberra Australia

An energy equation which includes the effects of potential energy, turbulent dissipation, heat flux and density flux due to fresh water discharge from estuaries is derived to evaluate the formation of frontal structures in coastal seas. Two different forms of tidal mixing criteria emerge which are the h/u3 of Simpson and Hunter (1974) for openshallow water and the h/u of Nunes et al (1989) for estuaries. The theory is capable ofpredicting tidal fronts in areas where both surface and lateral input of buoyancy are significant. The theory is applied to a tidal estuary and the locations of haline fronts which result from the influence of the fresh water discharge are predicted. The effect of surface heating on the formation and location of the frontal system is also discussed for the estuary.

关键词： tidal fronts coastal sea

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The differentiation of iron-reducing bacterial community and iron-reduction activity between riverine and marine sediments in the Yellow River estuary

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Marine Life Science & Technology 2020年第1期2卷 87-96页

作者： Hongxia Zhang Fanghua Liu Shiling Zheng Lei Chen Xiaoli Zhang Jun Gong CAS Key Laboratory of coastal Biology and Biological Resources Utilization Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003People's Republic of China CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071People's Republic of China University of Chinese Academy of Sciences Beijing 100049People's Republic of China Laboratory of Microbial Ecology and Matter Cycles.School of Marine Sciences Sun Yat-Sen UniversityZhuhai 519082People's Republic of China Southern Laboratory of Ocean Science and Engineering(Guangdong Zhuhai)Zhuhai 519000People's Republic of China

Rivers are the primary contributors of iron and other elements to the global ***-reducing bacteria play an important biogeochemical role in coupling the iron and carbon redox ***,the extent of changes in community structures and iron-reduction activities of iron-reducing bacteria in riverine and coastal marine sediments remains *** study presents information on the spatial patterns and relative abundance of iron-reducing bacteria in sediments of the Yellow River estuary and the adjacent Bohai ***-throughput sequencing of bacterial 16S rRNA found that the highest relative abundances and diversities were from the estuary(Yellow River-Bohai sea mixing zone).Pseudomonas,Thiobacillus,Geobacter,Rhodoferax,and Clostridium were the most abundant putative iron-reducing bacteria genera in the sediments of the Yellow ***,Shewanella,and Thiobacillus were the most abundant in the sediments of the Bohai *** putative iron-reducing bacterial community was positively correlated with the concentrations of total nitrogen and ammonium in coastal marine sediments,and was significantly correlated with the concentration of nitrate in river *** riverine sediments,with a more diverse iron-reducing bacterial community,exhibited increased activity of Fe(III)reduction in enrichment *** estuary-wide high abundance of putative iron-reducing bacteria suggests that the effect of river-sea interaction on bacterial distribution patterns is *** results of this study will help the understanding of the biogeochemical cycling of iron in riverine and coastal marine environments.

关键词： Iron-reducing bacteria River coastal sea River-sea interaction

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