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  • 1
    Online Resource
    Online Resource
    Oxford :Oxford University Press, Incorporated,
    Keywords: Chemical oceanography. ; Electronic books.
    Description / Table of Contents: This book provides a simple introduction to the concepts, the methods and the applications of marine geochemistry with a balance between didactic and indepth information.
    Type of Medium: Online Resource
    Pages: 1 online resource (423 pages)
    Edition: 1st ed.
    ISBN: 9780191091414
    DDC: 551.466
    Language: English
    Note: Cover -- Contents -- Foreword -- Preface -- Units, notation and abbreviations -- 1 A Few Bases of Descriptive and Physical Oceanography -- 1.1 The Size of the Ocean -- 1.2 Salinity, Temperature and Density: The Basic Parameters of the Oceanographer -- 1.2.1 Salinity -- 1.2.2 Temperature -- 1.2.3 Density -- 1.3 Vertical Structure of the Ocean -- 1.4 The Main Water Masses -- 1.5 Ocean Currents -- 1.5.1 Surface Circulation -- 1.5.2 The Physical Principles -- 1.5.3 The Wind-Driven Ocean Circulation -- 1.5.4 Ekman Pumping -- 1.5.5 Coastal Upwelling -- 1.5.6 Geostrophic Currents -- 1.6 Large-Scale Circulation -- 1.6.1 Vorticity -- 1.6.2 Sverdrup Balance -- 1.6.3 The Intensification of the Western Boundary Currents -- 1.6.4 Eddies and Recirculation -- 1.6.5 The Thermocline Ventilation -- 1.6.6 The Equatorial Circulation -- 1.6.7 The Deep Circulation -- Appendix 1: The Atmospheric Forcing -- Problems -- 2 Seawater Is More than Salted Water -- 2.1 Why Is Seawater Salty? -- 2.1.1 The Chemical Composition of Salt -- 2.1.2 Residence Time -- 2.1.3 Rivers and Estuaries -- 2.1.4 The Atmosphere -- 2.1.5 Volcanic and Hydrothermal Processes -- 2.1.6 The Removal of Chemical Elements -- 2.2 Concept of Conservative and Non-Conservative Tracers -- 2.3 The Nutrient Cycle and the Role of Biological Activity -- 2.3.1 Nutrient Profiles in Seawater -- 2.3.2 The Life Cycles in the Ocean -- 2.3.3 Influence of Deep Circulation on the Nutrient Distribution -- 2.4 Gases in Seawater -- 2.4.1 Definition of Apparent Oxygen Utilization -- 2.5 Relationships between the Different Tracers -- 2.5.1 Extracting the Conservative Fraction of a Tracer -- 2.5.2 Construction of Conservative Tracers -- 2.5.3 Horizontal and Vertical Changes of Tracers -- 2.6 Carbon Chemistry -- 2.6.1 The Carbonate System -- 2.6.2 Calcium Carbonate -- 2.6.3 Organic Carbon -- 2.7 The Redox Conditions in the Ocean. , 2.8 Behavior of Trace Metals -- 2.8.1 The Different Types of Profiles -- 2.8.2 Oxidation and Reduction of Manganese -- 2.8.3 Complexation of Iron -- 2.9 Many Open Questions -- Appendix 1 -- Problems -- 3 Stable Isotopes -- 3.1 What Is an Isotope? -- 3.2 Notations -- 3.3 The Different Types of Fractionations: The Oxygen Example -- 3.3.1 Kinetic Fractionations -- 3.3.2 Thermodynamic Fractionations -- 3.3.3 Seaside Analogy -- 3.3.4 The "Biological'' Fractionations -- 3.3.5 Mass-Dependent and Mass-Independent Fractionations -- 3.3.6 Clumped Isotopes -- 3.4 Oxygen Isotope Fractionation -- 3.4.1 The Fractionations in the Water Cycle -- 3.4.2 Isotope Exchange between Water and Solid -- 3.5 Hydrogen Isotope Fractionation -- 3.6 Carbon Isotope Fractionation -- 3.6.1 Fractionations in the Carbonate System -- 3.6.2 Biological Fractionations -- 3.6.3 The δ13 C-PO43- Relationship in Seawater -- 3.7 Nitrogen Isotope Fractionation -- 3.8 Sulfur Isotope Fractionation -- 3.9 Boron Isotope Fractionation -- 3.10 Silicon Isotope Fractionation -- 3.11 Iron Isotope Fractionation -- 3.12 Mixing of Isotopic Tracers -- 3.12.1 Conservative Mixing -- 3.12.2 Non-Conservative Mixing -- 3.13 Evolution of the Isotopic Signature during a Reaction -- 3.13.1 Example: Nitrate Assimilation by Phytoplankton -- Appendix 1: Evolution of Isotopic Signatures during Fractionation Processes -- Problems -- 4 Radioactive and Radiogenic Isotopes -- 4.1 Radioactivity -- 4.2 The Radioactive Decay Law and its Applications -- 4.2.1 The Radioactive Decay Law -- 4.2.2 Disintegration without Simultaneous Production -- 4.2.3 Disintegration with Simultaneous Production -- 4.2.4 Definition of the Activity -- 4.3 The Long-Lived Radioactive Decay Systems -- 4.3.1 Strontium -- 4.3.2 Neodymium -- 4.3.3 Lead -- 4.3.4 Helium -- 4.4 The Uranium and Thorium Decay Chains -- 4.5 Cosmogenic Isotopes. , 4.5.1 The 14C Isotope -- 4.5.2 The 10Be Isotope -- 4.6 Artificial Isotopes -- Appendix 1 -- Integration of the Radioactivity Equation for a Closed System without Production Term -- Integration of the Radioactivity Equation for a Closed System with Production Term -- Calculation of the Mean Lifetime of an Isotope -- Problems -- 5 Box Models -- 5.1 One-Box Model -- 5.1.1 The Conservation Equation -- 5.1.2 Case of Enzyme Kinetics -- 5.1.3 Steady State -- 5.1.4 Residence Time -- 5.2 Dynamic Behavior of a Reservoir -- 5.2.1 Constant Forcing -- 5.2.2 Temporal Evolution of the Forcings -- 5.3 Box Models and Isotopic Tracers -- 5.3.1 Use of U and Th Decay Chains -- 5.3.2 Using the Isotopic Composition of a Tracer -- 5.3.3 Application Exercise: Ventilation of the Deep Waters in the Red Sea -- 5.4 Dynamics of Coupled Boxes -- 5.5 Mean Age, Residence Time and Reservoir Age of a Tracer -- Problems -- 6 Advection-Diffusion Models -- 6.1 An Infinitesimal Box -- 6.2 Advection -- 6.3 Molecular Diffusion -- 6.3.1 Random Walk -- 6.3.2 The Fick Law -- 6.3.3 Gas Diffusion at the Air-Sea Interface -- 6.4 Eddy Diffusion -- 6.5 The Full Conservation Equation -- 6.5.1 Example 1: Radium Transport in Coastal Waters -- 6.5.2 Example 2: Dispersion of SF6 in the Thermocline -- 6.6 The Case of Sediment Transport -- Problems -- 7 Development and Limitations of Biological Activity in Surface Waters -- 7.1 Life Cycle in the Ocean -- 7.2 Development of the Biological Production in Surface Waters -- 7.3 Estimating the Primary Production -- 7.4 Global Distribution of Photosynthesis and Ocean Color -- 7.5 Iron Limitation -- 7.6 Silica Limitation -- 7.7 A CO2 Limitation? -- 7.8 The Long-Term Limitation of the Production -- 7.9 Anthropogenic Impacts -- Problems -- 8 CO2 Exchanges between the Ocean and the Atmosphere -- 8.1 The Global Carbon Cycle. , 8.2 The Partial Pressure of CO2 in Seawater -- 8.2.1 Temperature Effect -- 8.2.2 Carbonate System Effect -- 8.2.3 Photosynthesis -- 8.2.4 Remineralization -- 8.2.5 The Formation of Calcium Carbonate (CaCO3) -- 8.2.6 CaCO3 Dissolution -- 8.2.7 Overall Effect on the Pumping of CO2 -- 8.3 The Carbon Storage Capacity of the Ocean -- 8.4 Rate of CO2 Transfer at the Air-Sea Interface -- 8.5 Gas Equilibration Time between the Mixed Layer and the Atmosphere -- 8.5.1 Perturbation of Oxygen -- 8.5.2 Perturbation of the Carbonate System -- 8.5.3 Perturbation of the Isotopic Composition -- 8.6 Observation of the Anthropogenic Perturbation at the Ocean Surface -- 8.7 Global Estimate of the Ocean-Atmosphere Exchanges -- 8.8 Spread of the Anthropogenic Perturbation in the Deep Ocean -- Problems -- 9 The Little World of Marine Particles -- 9.1 Origin and Nature of Marine Particles -- 9.2 Marine Particle Sampling -- 9.3 The Distribution of Particles -- 9.4 Particle Sinking -- 9.5 Changes of the Particle Flux with Depth -- 9.5.1 The Organic Matter Flux -- 9.5.2 The Mineral Phases -- 9.6 Estimation of the Particle Flux -- 9.6.1 234Th and Irreversible ``Scavenging'' Models -- 9.6.2 Relations between Small and Large Particles -- 9.6.3 230Th and Reversible Models -- 9.7 The Role of Margins -- 9.7.1 Boundary Scavenging -- 9.7.2 Boundary Exchange -- 9.8 The Distribution of Sediments on the Seafloor -- 9.9 The Diagenesis -- 9.10 Timescales and Sediment Fluxes -- Problems -- 10 Thermohaline Circulation -- 10.1 The Long Path of Deep Waters -- 10.2 The Rapid Progression of Transient Tracers -- 10.2.1 Deep Current Dynamics -- 10.2.2 Intensity of the Recirculation -- 10.3 14C-Transient Tracer Comparison -- 10.4 The Contribution of 231Pa-230Th -- 10.5 The Origin of the AABW -- 10.6 Closure of the Meridional Overturning Circulation -- Problems. , 11 Ocean History and Climate Evolution -- 11.1 The Origin of the Ocean -- 11.2 The First Traces of Life -- 11.3 The Rise of Oxygen -- 11.4 Geological Sequestration of CO2 -- 11.5 The Closure of the Panama Isthmus -- 11.6 The Last Glaciation -- 11.7 El Niño Exacerbated by Human Activity? -- 11.8 The Climate of the Future and the Ocean -- 11.9 The Expected Consequences -- Problems -- Problem solutions -- Glossary -- References -- Index.
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  • 2
    Online Resource
    Online Resource
    Les Ulis :EDP Sciences,
    Keywords: Electronic books.
    Description / Table of Contents: No detailed description available for "La chimie et la mer".
    Type of Medium: Online Resource
    Pages: 1 online resource (208 pages)
    Edition: 1st ed.
    ISBN: 9782759803392
    Series Statement: Chimie Et ... Series
    Language: French
    Note: Intro -- Sommaire -- Préface : par Paul Rigny -- Préface: par Bernard Bigot -- Les grandes questions en sciences chimiques de l'environnement marin -- Bibliographie -- Partie 1 : Comprendre la mer -- Chapitre 1 : Des clefs pour comprendre l'océan : les traceurs chimiques et isotopiques -- Chapitre 2 : Faut-il fertiliser l'océan pour contrôler le climat ? -- Bibliographie -- Partie 2 : Profiter de la mer -- Chapitre 1 : Les ressources minérales du futur sont-elles au fond des mers ? -- Bibliographie -- Chapitre 2 : L'exploitation des nodules polymétalliques : utopie ou réalité ? -- Bibliographie -- Chapitre 3 : Hydrates de gaz et Hydrogène : ressources de la mer du futur ? -- Bibliographie -- Chapitre 4 : Du minéral à la vie : les oasis des grands fonds -- Bibliographie -- Chapitre 5 : Les médicaments de la mer : espoir ou illusion ? -- Bibliographie -- Partie 3 : La chimie pour aider la mer -- Chapitre 1 : L'homme, la chimie et la mer : connaître la contamination pour la combattre -- Chapitre 2 : La lutte physicochimique contre les marées noires : trente ans d'expérience -- Bibliographie -- Chapitre 3 : La chimie à l'assaut des biosalissures -- Bibliographie -- Glossaire -- Crédits photographiques -- L'Institut français de recherche pour l'exploitation de la mer.
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  • 3
    Keywords: marine sciences ; biogeochemistry ; isotopes ; trace elements
    In: (2003)
    In: year:2003
    Type of Medium: Online Resource
    Language: Undetermined
    Note: EOS : transactions / American Geophysical Union
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  • 4
    Book
    Book
    Oxford; New York, NY : Oxford University Press
    Keywords: Chemical oceanography ; Geochemistry ; Lehrbuch ; Meerwasser ; Meeressediment ; Geochemie ; Meereschemie ; Meereskunde ; Isotopengeochemie ; Isotopenhäufigkeit ; Biogeochemie ; Kreislauf ; Stoffübertragung ; Lehrbuch ; Meerwasser ; Meeressediment ; Geochemie
    Type of Medium: Book
    Pages: xxiii, 398 Seiten , Illustrationen, Diagramme , 25 cm
    Edition: First edition
    ISBN: 9780198787501 , 9780198787495
    Uniform Title: Géochimie Marine
    DDC: 551.466
    RVK:
    Language: English
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  • 5
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The availability of iron limits primary productivity and the associated uptake of carbon over large areas of the ocean. Iron thus plays an important role in the carbon cycle, and changes in its supply to the surface ocean may have had a significant effect on atmospheric carbon dioxide ...
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract From November 1992 to February 1995 a quantitative and qualitative phytoplankton study was conducted at a permanent station (Kerfix) southwest off the Kerguelen Islands, in the vicinity of the Polar Front (50°40′S–68°25′E). Phytoplankton populations are low in this area both during summers and winters. They consist, in order of decreasing cell abundance, of pico- and nanoflagellates (1.5–20 μm), coccolithophorids (〈10 μm), diatoms (5–80 μm) and dinoflagellates (6–60 μm). Flagellates form the dominant group throughout the year and attain the highest summer average of 3.0 × 105 cells l−1. Next in abundance year-round are coccolithophorids with the dominant Emiliania huxleyi (highest summer 1992 average 1.9 × 105 cells l−1), diatoms (summer 1992 average 1.0 × 105 cells l−1) and dinoflagellates (average 3.8 × 104 cells l−1). Winter mean numbers of flagellates and picoplankton do not exceed 8.4 × 104 cells l−1; those of the three remaining algal groups together attain 2 × 104 cells l−1. Summer peaks of diatoms and dinoflagellates are mainly due to the larger size species (〉20 μm). The latter group contributes most to the total cell carbon biomass throughout the year. Dominant diatoms during summer seasons include: Fragilariopsis kerguelensis, Thalassionema nitzschioides, Chaetoceros dichaeta, C. atlanticus, Pseudonitzschia heimii, and P. barkleyi/lineola. This diatom dominance structure changes from summer to summer with only F. kerguelensis and T. nitzschioides retaining their first and second positions. Any one of the co-dominant species might be absent during some summer period. The variable diatom community structure may be due to southward meandering of the Polar Front bringing “warmer” species from the north, and to the mixing of the water masses in this area. The entire community structure characterized both during summer and winters by the dominance of flagellates can be related to deep mixing (ca. 40–200 m) of the water column as the probable controlling factor.
    Type of Medium: Electronic Resource
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  • 8
    Publication Date: 2021-02-08
    Description: The GEOTRACES Intermediate Data Product 2017 (IDP2017) is the second publicly available data product of the international GEOTRACES programme, and contains data measured and quality controlled before the end of 2016. The IDP2017 includes data from the Atlantic, Pacific, Arctic, Southern and Indian oceans, with about twice the data volume of the previous IDP2014. For the first time, the IDP2017 contains data for a large suite of biogeochemical parameters as well as aerosol and rain data characterising atmospheric trace element and isotope (TEI) sources. The TEI data in the IDP2017 are quality controlled by careful assessment of intercalibration results and multi-laboratory data comparisons at crossover stations. The IDP2017 consists of two parts: (1) a compilation of digital data for more than 450 TEIs as well as standard hydrographic parameters, and (2) the eGEOTRACES Electronic Atlas providing an on-line atlas that includes more than 590 section plots and 130 animated 3D scenes. The digital data are provided in several formats, including ASCII, Excel spreadsheet, netCDF, and Ocean Data View collection. Users can download the full data packages or make their own custom selections with a new on-line data extraction service. In addition to the actual data values, the IDP2017 also contains data quality flags and 1-σ data error values where available. Quality flags and error values are useful for data filtering and for statistical analysis. Metadata about data originators, analytical methods and original publications related to the data are linked in an easily accessible way. The eGEOTRACES Electronic Atlas is the visual representation of the IDP2017 as section plots and rotating 3D scenes. The basin-wide 3D scenes combine data from many cruises and provide quick overviews of large-scale tracer distributions. These 3D scenes provide geographical and bathymetric context that is crucial for the interpretation and assessment of tracer plumes near ocean margins or along ridges. The IDP2017 is the result of a truly international effort involving 326 researchers from 22 countries. This publication provides the critical reference for unpublished data, as well as for studies that make use of a large cross-section of data from the IDP2017.
    Type: Article , PeerReviewed
    Format: text
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  • 9
    Publication Date: 2021-04-23
    Description: The GEOVIDE cruise, a collaborative project within the framework of the international GEOTRACES programme, was conducted along the French-led section in the North Atlantic Ocean (Section GA01), between 15 May and 30 June 2014. In this Special Issue, results from GEOVIDE, including physical oceanography and trace element and isotope cyclings, are presented among seventeen articles. Here, the scientific context, project objectives and scientific strategy of GEOVIDE are provided, along with an overview of the main results from the articles published in the special issue.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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  • 10
    Publication Date: 2017-08-28
    Description: Iron limits phytoplankton growth and hence the biological carbon pump in the Southern Ocean1. Models assessing the impacts of iron on the global carbon cycle generally rely on dust input and sediment resuspension as the predominant sources2, 3. Although it was previously thought that most iron from deep-ocean hydrothermal activity was inaccessible to phytoplankton because of the formation of particulates4, it has been suggested that iron from hydrothermal activity5, 6, 7 may be an important source of oceanic dissolved iron8, 9, 10, 11, 12, 13. Here we use a global ocean model to assess the impacts of an annual dissolved iron flux of approximately 9×108 mol, as estimated from regional observations of hydrothermal activity11, 12, on the dissolved iron inventory of the world’s oceans. We find the response to the input of hydrothermal dissolved iron is greatest in the Southern Hemisphere oceans. In particular, observations of the distribution of dissolved iron in the Southern Ocean3 (Chever et al., manuscript in preparation; Bowie et al., manuscript in preparation) can be replicated in our simulations only when our estimated iron flux from hydrothermal sources is included. As the hydrothermal flux of iron is relatively constant over millennial timescales14, we propose that hydrothermal activity can buffer the oceanic dissolved iron inventory against shorter-term fluctuations in dust deposition.
    Type: Article , PeerReviewed
    Format: text
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