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  • 2000-2004  (18)
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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
    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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  • 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
    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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  • 5
    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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  • 6
    Publication Date: 2021-02-08
    Description: While hydrothermal vents are now thought to be a major source of dissolved iron to the oceans, they have always been considered to be a sink for the dissolved rare-earth elements (DREEs). However, true dissolved REE observations in hydrothermal plumes are still lacking. Here we report for the first time the DREE concentrations and neodymium isotopic compositions (DεNd) of buoyant hydrothermal fluids at Lucky Strike (Mid-Atlantic Ridge). We find that 27 to 62% of total hydrothermal DREEs are rapidly scavenged by anhydrite precipitation at the onset of buoyant plume formation. After this initial loss, all DREEs behave quasi-conservatively within the buoyant plume. Dissolved phase εNd (DεNd) in the evolving plume are identical to black smoker DεNd of +9.0 and contrast radically with DεNd of the local deep water mass at −12.0. Plume DεNd as low as +6.6 may be reconciled by dissolution of newly formed barite in the local environment and carrying seawater DεNd signature. We find, based on the first plume DREE observations, that hydrothermal plumes are in fact a source of DREE to the North Atlantic Deep Water. Precipitation/dissolution processes of hydrothermally-derived minerals, i.e. sulfates in the buoyant plume and Fe oxy-hydroxide in the non-buoyant plume, will likely affect the fate of other trace metals and their isotopic composition.
    Type: Article , PeerReviewed
    Format: text
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  • 7
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    Royal Society of London
    In:  Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 374 (2081).
    Publication Date: 2020-06-12
    Description: Land to ocean transfer of material largely controls the chemical composition of seawater and the global element cycles. Oceanic isotopic budgets of chemical species, macro- and micronutrients (e.g. Nd, Sr, Si, Mg, Zn, Mo and Ni) have revealed an imbalance between their sources and sinks. Radiogenic isotope budgets underlined the importance of taking into account continental margins as a source of elements to oceans. They also highlighted that the net land–ocean inputs of chemical species probably result from particle-dissolved exchange processes, named ‘Boundary Exchange’. Yet, locations where ‘Boundary Exchange’ occurs are not clearly identified and reviewed here: discharge of huge amount of freshly weathered particles at the river mouths, submarine weathering of deposited sediments along the margins, submarine groundwater discharges and subterranean estuaries. As a whole, we conclude that all of them might contribute to ‘Boundary Exchange’. Highlighting their specific roles and the processes at play is a key scientific issue for the second half of GEOTRACES.
    Type: Article , PeerReviewed
    Format: text
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  • 8
    Publication Date: 2020-06-26
    Description: Highlights: • GEOTRACES releases its first integrated and quality controlled Intermediate Data Product 2014 (IDP2014). • The IDP2014 digital data are available at http://www.bodc.ac.uk/geotraces/data/idp2014/ in 4 different formats. • The eGEOTRACES Electronic Atlas at http://egeotraces.org/ provides 329 section plots and 90 animated 3D tracer scenes. • The new 3D scenes provide geographical and bathymetric context crucial for tracer assessment and interpretation. Abstract: The GEOTRACES Intermediate Data Product 2014 (IDP2014) is the first publicly available data product of the international GEOTRACES programme, and contains data measured and quality controlled before the end of 2013. It consists of two parts: (1) a compilation of digital data for more than 200 trace elements and isotopes (TEIs) as well as classical hydrographic parameters, and (2) the eGEOTRACES Electronic Atlas providing a strongly inter-linked on-line atlas including more than 300 section plots and 90 animated 3D scenes. The IDP2014 covers the Atlantic, Arctic, and Indian oceans, exhibiting highest data density in the Atlantic. The TEI data in the IDP2014 are quality controlled by careful assessment of intercalibration results and multi-laboratory data comparisons at cross-over stations. The digital data are provided in several formats, including ASCII spreadsheet, Excel spreadsheet, netCDF, and Ocean Data View collection. In addition to the actual data values the IDP2014 also contains data quality flags and 1-σ data error values where available. Quality flags and error values are useful for data filtering. Metadata about data originators, analytical methods and original publications related to the data are linked to the data in an easily accessible way. The eGEOTRACES Electronic Atlas is the visual representation of the IDP2014 data providing section plots and a new kind of animated 3D scenes. The basin-wide 3D scenes allow for viewing of data from many cruises at the same time, thereby providing quick overviews of large-scale tracer distributions. In addition, the 3D scenes provide geographical and bathymetric context that is crucial for the interpretation and assessment of observed tracer plumes, as well as for making inferences about controlling processes.
    Type: Article , PeerReviewed
    Format: text
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  • 9
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    Royal Society of London
    In:  Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 374 (2081). p. 20160246.
    Publication Date: 2020-06-12
    Description: Quantifying fluxes of trace elements and their isotopes (TEIs) at the ocean's sediment–water boundary is a pre-eminent challenge to understand their role in the present, past and future ocean. There are multiple processes that drive the uptake and release of TEIs, and properties that determine their rates are unevenly distributed (e.g. sediment composition, redox conditions and (bio)physical dynamics). These factors complicate our efforts to find, measure and extrapolate TEI fluxes across ocean basins. GEOTRACES observations are unveiling the oceanic distributions of many TEIs for the first time. These data evidence the influence of the sediment–water boundary on many TEI cycles, and underline the fact that our knowledge of the source–sink fluxes that sustain oceanic distributions is largely missing. Present flux measurements provide low spatial coverage and only part of the empirical basis needed to predict TEI flux variations. Many of the advances and present challenges facing TEI flux measurements are linked to process studies that collect sediment cores, pore waters, sinking material or seawater in close contact with sediments. However, such sampling has not routinely been viable on GEOTRACES expeditions. In this article, we recommend approaches to address these issues: firstly, with an interrogation of emergent data using isotopic mass-balance and inverse modelling techniques; and secondly, by innovating pursuits of direct TEI flux measurements. We exemplify the value of GEOTRACES data with a new inverse model estimate of benthic Al flux in the North Atlantic Ocean. Furthermore, we review viable flux measurement techniques tailored to the sediment–water boundary. We propose that such activities are aimed at regions that intersect the GEOTRACES Science Plan on the basis of seven criteria that may influence TEI fluxes: sediment provenance, composition, organic carbon supply, redox conditions, sedimentation rate, bathymetry and the benthic nepheloid inventory.
    Type: Article , PeerReviewed
    Format: text
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  • 10
    Publication Date: 2020-06-12
    Description: Continental shelves and shelf seas play a central role in the global carbon cycle. However, their importance with respect to trace element and isotope (TEI) inputs to ocean basins is less well understood. Here, we present major findings on shelf TEI biogeochemistry from the GEOTRACES programme as well as a proof of concept for a new method to estimate shelf TEI fluxes. The case studies focus on advances in our understanding of TEI cycling in the Arctic, transformations within a major river estuary (Amazon), shelf sediment micronutrient fluxes and basin-scale estimates of submarine groundwater discharge. The proposed shelf flux tracer is 228-radium (T1/2 = 5.75 yr), which is continuously supplied to the shelf from coastal aquifers, sediment porewater exchange and rivers. Model-derived shelf 228Ra fluxes are combined with TEI/ 228Ra ratios to quantify ocean TEI fluxes from the western North Atlantic margin. The results from this new approach agree well with previous estimates for shelf Co, Fe, Mn and Zn inputs and exceed published estimates of atmospheric deposition by factors of approximately 3–23. Lastly, recommendations are made for additional GEOTRACES process studies and coastal margin-focused section cruises that will help refine the model and provide better insight on the mechanisms driving shelf-derived TEI fluxes to the ocean.
    Type: Article , PeerReviewed
    Format: text
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