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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
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    PANGAEA
    In:  Supplement to: van Hulten, Marco M P; Dutay, Jean-Claude; Roy-Barman, Matthieu (2018): A global scavenging and circulation ocean model of thorium-230 and protactinium-231 with improved particle dynamics (NEMO–ProThorP 0.1). Geoscientific Model Development, 11(9), 3537-3556, https://doi.org/10.5194/gmd-11-3537-2018
    Publication Date: 2023-02-24
    Description: This archive contains all output from the PISCES-v2 model, containing 24 carbon, nitrate, phosphate and iron tracers. The model is extended with models of lithogenic particles and thorium-230 and protactinium-231, adding eight additional tracers, namely small and big lithogenic particles, and dissolved, small and big Th-230 and Pa-231 (referred to as ProThorP). Thus the model contains 32 different tracers (ptrc) for two different simulations, as well as diagnostic data (diad). The model is executed as part of the global ocean general cirulation model NEMO in the ORCA2 configuration (2° x 2° cos(phi) x 31 layers).
    Keywords: Comment; File content; File format; File name; File size; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 29 data points
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  • 4
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    PANGAEA
    In:  Supplement to: van Hulten, Marco M P; Middag, Rob; Dutay, Jean-Claude; de Baar, Hein J W; Roy-Barman, Matthieu; Gehlen, Marion; Tagliabue, Alessandro; Sterl, Andreas (2017): Manganese in the west Atlantic Ocean in the context of the first global ocean circulation model of manganese. Biogeosciences, 14(5), 1123-1152, https://doi.org/10.5194/bg-14-1123-2017
    Publication Date: 2023-02-24
    Description: Dissolved manganese (Mn) is a biologically essential element. Moreover, its oxidised form is involved in removing itself and several other trace elements from ocean waters. Here we report the longest thus far (17500 km length) full-depth ocean section of dissolved Mn in the west Atlantic Ocean, comprising 1320 data values of high accuracy. This is the GA02 transect that is part of the GEOTRACES programme, which aims to understand trace element distributions. The goal of this study is to combine these new observations with new, state-of-the-art, modelling to give a first assessment of the main sources and redistribution of Mn throughout the ocean. To this end, we simulate the distribution of dissolved Mn using a global-scale circulation model. This first model includes simple parameterisations to account for the sources, processes and sinks of Mn in the ocean. Oxidation and (photo)reduction, aggregation and settling, as well as biological uptake and remineralisation by plankton are included in the model. Our model provides, together with the observations, the following insights: – The high surface concentrations of manganese are caused by the combination of photoreduction and sources contributing to the upper ocean. The most important sources are sediments, dust, and, more locally, rivers. – Observations and model simulations suggest that surface Mn in the Atlantic Ocean moves downwards into the southward-flowing North Atlantic Deep Water (NADW), but because of strong removal rates there is no elevated concentration of Mn visible any more in the NADW south of 40° N. – The model predicts lower dissolved Mn in surface waters of the Pacific Ocean than the observed concentrations. The intense oxygen minimum zone (OMZ) in subsurface waters is deemed to be a major source of dissolved Mn also mixing upwards into surface waters, but the OMZ is not well represented by the model. Improved high-resolution simulation of the OMZ may solve this problem. – There is a mainly homogeneous background concentration of dissolved Mn of about 0.10–0.15 nM throughout most of the deep ocean. The model reproduces this by means of a threshold on particulate manganese oxides of 25 pM, suggesting that a minimal concentration of particulate Mn is needed before aggregation and removal become efficient. – The observed distinct hydrothermal signals are produced by assuming both a strong source and a strong removal of Mn near hydrothermal vents.
    Keywords: GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes
    Type: Dataset
    Format: application/zip, 393.1 MBytes
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  • 5
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    PANGAEA
    In:  Supplement to: Venchiarutti, Célia; Jeandel, Catherine; Roy-Barman, Matthieu (2008): Particle dynamics study in the wake of Kerguelen Island using thorium isotopes. Deep Sea Research Part I: Oceanographic Research Papers, 55(10), 1343-1363, https://doi.org/10.1016/j.dsr.2008.05.015
    Publication Date: 2023-10-28
    Description: In the context of the KErguelen Ocean and Plateau compared Study (KEOPS, 19 January-13 February 2005), particle dynamics were investigated using thorium isotope measurements over and off the Kerguelen plateau. Dissolved and particulate 230Th and 232Th samples were collected at nine stations. Dissolved excess 230Th concentrations (230Thxs) vary from 0.5 to 20.8 fg/kg and particulate 230Thxs concentrations from 0.1 to 10.0 fg/kg. Dissolved and particulate 232Th concentration ranges are 16.8-450.2 pg/kg and 3.8-502.8 pg/kg, respectively. The 230Thxs concentrations increase linearly with depth down to the bottom at most of the plateau stations and down to 1000 m at the off-plateau stations. This linear trend is observed down to the bottom (1550 m) at Kerfix, the open-ocean "upstream" station located west of the Kerguelen plateau. A simple reversible scavenging model applied to these data allowed the estimation of adsorption rate constant (k1~=0.2-0.8 per year), desorption rate constant (k-1~=1-8 per year) and partition coefficients (average K=0.16±0.07). Calculated particle settling velocities S deduced from this simple model are ca. 500 m/year at most of the plateau stations and 800 m/year at all the off-plateau stations. The plateau settling velocities are relatively low for such a productive site, compared to the surrounding HNLC areas. The difference might reflect the fact that lateral advection is neglected in this model. Taking this advection into account allows the reconstruction of the observed 230Thxs linear distributions, but only if faster settling velocities are considered. This implies that the 1D model strongly underestimates the settling velocity of the particles. In the deep layers, the occurrence of intense boundary scavenging along the escarpment due to bottom sediment re-suspension and interaction with a nepheloid layer, yielding a removal of ~50% of the Th stock along the northwestward transect, is suggested.
    Keywords: CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Event label; Indian Ocean; Latitude of event; Longitude of event; Marion Dufresne (1995); MD145; MD145_A11; MD145_A3-3; MD145_A3-4; MD145_B1; MD145_B11; MD145_B5; MD145_C1; MD145_C11; MD145_C5; MD145_Kerfix; OISO_12, KEOPS,35MF20050113; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; SPP1158; Thorium-230; Thorium-230, dissolved; Thorium-230, dissolved, standard deviation; Thorium-230, particulate; Thorium-230, particulate, standard deviation; Thorium-230, standard deviation; Thorium-230 excess; Thorium-230 excess, dissolved; Thorium-230 excess, dissolved, standard deviation; Thorium-230 excess, particulate; Thorium-230 excess, particulate, standard deviation; Thorium-230 excess, standard deviation; Thorium-232; Thorium-232, dissolved; Thorium-232, dissolved, standard deviation; Thorium-232, particulate; Thorium-232, particulate, standard deviation; Thorium-232, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 767 data points
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  • 6
    Publication Date: 2023-11-02
    Description: In this study we present dissolved ²³⁰Th and ²³²Th results, as well as amount of particulate ²³⁴Th from total ²³⁴Th. The data, obtained as part of the GEOTRACES central Arctic Ocean sections GN04 (2015) and IPY11 (2007). Samples were analyzed following GEOTRACES methods, and compared to previous results from 1991. We observe significant decreases in ²³⁰Th concentrations in the intermediate waters of the Amundsen Basin. This removal was explained by scavenging removal of dissolved ²³⁰Th on the Barents Sea Shelf and along Atlantic water inflow pathways. This finding shows that a far-field decrease of dissolved ²³⁰Th can be caused by changes in scavenging on inflow passages and highlights the importance of repeated GEOTRACES sections.
    Keywords: 230Th; Arctic Ocean; AWI_MarGeoChem; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Marine Geochemistry @ AWI; Time series
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 7
    Publication Date: 2023-11-02
    Keywords: 230Th; Arctic Ocean; ARK-XXIX/3; AWI_MarGeoChem; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Event label; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; ICP-MS, Thermo Scientific Neptune; Latitude of event; Longitude of event; Marine Geochemistry @ AWI; Polarstern; PS94; PS94/125-2; PS94/125-5; Thorium-230, dissolved; Thorium-230, error; Thorium-232, error; Thorium-232, particulate; Time series
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 8
    Publication Date: 2023-11-02
    Keywords: 230Th; Arctic Ocean; ARK-XXIX/3; AWI_MarGeoChem; Date/Time of event; DEPTH, water; Event label; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; In situ pump; ISP; Latitude of event; Longitude of event; Marine Geochemistry @ AWI; Polarstern; PS94; PS94/081-9; PS94/117-7; PS94/125-8; Thorium-234, particulate, fraction of total; Time series
    Type: Dataset
    Format: text/tab-separated-values, 33 data points
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  • 9
    Publication Date: 2023-11-02
    Keywords: 230Th; Arctic Ocean; ARK-XXII/2; AWI_MarGeoChem; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Event label; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; ICP-MS, Thermo Scientific Neptune; Laptev Sea; Latitude of event; Longitude of event; Marine Geochemistry @ AWI; Polarstern; PS70/309-5; PS70/400-2; PS70 SPACE DAMOCLES; Thorium-230, dissolved; Thorium-230, error; Thorium-232, error; Thorium-232, particulate; Time series
    Type: Dataset
    Format: text/tab-separated-values, 48 data points
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  • 10
    Publication Date: 2024-03-02
    Description: In this dataset we present a global compilation of over 1000 sedimentary records of 230Th from across the global ocean at two time slices, the Late Holocene (0-5000 years ago, or 0-5 ka) and the Last Glacial Maximum (18.5-23.5 ka). Data have been screened for age control, errors, and lithogenic corrections. Overall quality levels were computed by summing each record's scores on the individual criteria. A record is optimal if it is based on a chronology that is constrained by δ18O or 14C and it provides both the raw nuclide concentrations and the associated errors. About one quarter of the records in the database achieved this highest quality level. The large majority of the records in the database are good, passing two of the three criteria, while the remaining quarter are of fair or poor quality.
    Keywords: Comment; DEPTH, water; Distance; Flag; Focusing factor; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Identification; LATITUDE; LONGITUDE; Ocean; ORDINAL NUMBER; Quality level; Ratio; Reference/source; Thorium-230 excess, decay-corrected; Total sediment, flux; Uranium/Thorium ratio
    Type: Dataset
    Format: text/tab-separated-values, 15667 data points
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