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  • 1
    Online Resource
    Online Resource
    San Diego :Elsevier Science & Technology,
    Keywords: Seawater -- Carbon dioxide content. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (361 pages)
    Edition: 1st ed.
    ISBN: 9780080529226
    Series Statement: Issn Series ; v.Volume 65
    Language: English
    Note: Cover -- Contents -- Chapter 1. Equilibrium -- 1.1 The carbonate system -- 1.2 Alkalinity -- 1.3 pH scales -- 1.4 Partial pressure and fugacity -- 1.5 The Revelle factor -- 1.6 Worked out problems -- Chapter 2. Kinetics -- 2.1 Basic concepts of kinetics -- 2.2 Temperature dependence of rate constants -- 2.3 Reactions and rate constants of the carbonate system -- 2.4 Approaching equilibrium: the carbonate system -- 2.5 Approaching isotopic equilibrium: 12C, 13C, and 14C -- 2.6 Diffusion and Reaction -- 2.7 Summary -- Chapter 3. Stable Isotope Fractionation -- 3.1 Notation, abundances, standards -- 3.2 Carbon -- 3.3 Oxygen -- 3.4 Boron -- 3.5 Thermodynamic properties of isotopic substances -- Appendix A: Equilibrium constants -- A.1 CO2: Acidity constants K1* and K2* -- A.2 Acidity constant of true carbonic acid -- A.3 CO2 solubility in water (Henry's law) -- A.4 Ion product of water: KW* -- A.5 Bisulfate ion -- A.6 Hydrogen fluoride -- A.7 Boric acid -- A.8 Phosphoric acid -- A.9 Silicic acid -- A.10 Solubility product of calcite and aragonite -- A.11 Effect of pressure on equilibrium constants -- A.12 Chemical composition of seawater -- A.13 The equation of state of seawater -- Appendix B: From two to six -- Appendix C: Details and Calculations -- C.1 Total alkalinity and charge balance -- C.2 Saturation vapor pressure of water -- C.3 The fugacity of a pure gas -- C.4 Equilibrium at air-sea interface and chemical potential -- C.5 Change CO2 concentration while keeping pH constant -- C.6 The rate constant for the hydroxylation of CO2, k+4 -- C.7 A formula for the equilibration time of CO2 -- C.8 Kinetic rate laws of the carbonate system -- C.9 Derivation of oxygen isotope partitioning -- C.10 Mathematical derivation of the partition function ratio -- Appendix D: Answers to Exercises -- Appendix E: Notation and Symbols -- References -- Index.
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  • 2
    In: Biogeosciences, Katlenburg-Lindau [u.a.] : Copernicus, 2004, 6(2009), 10, Seite 2145-2153, 1726-4189
    In: volume:6
    In: year:2009
    In: number:10
    In: pages:2145-2153
    Type of Medium: Online Resource
    Pages: graph. Darst
    ISSN: 1726-4189
    Language: English
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  • 3
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    AGU (American Geophysical Union)
    In:  Global Biogeochemical Cycles, 15 . pp. 507-516.
    Publication Date: 2018-03-15
    Description: In laboratory experiments with the coccolithophore species Emiliania huxleyi and Gephyrocapsa oceanica, the ratio of particulate inorganic carbon (PIC) to particulate organic carbon (POC) production decreased with increasing CO2 concentration ([CO2]). This was due to both reduced PIC and enhanced POC production at elevated [CO2]. Carbon dioxide concentrations covered a range from a preindustrial level to a value predicted for 2100 according to a “business as usual” anthropogenic CO2 emission scenario. The laboratory results were used to employ a model in which the immediate effect of a decrease in global marine calcification relative to POC production on the potential capacity for oceanic CO2 uptake was simulated. Assuming that overall marine biogenic calcification shows a similar response as obtained for E. huxleyi or G. oceanica in the present study, the model reveals a negative feedback on increasing atmospheric CO2 concentrations owing to a decrease in the PIC/POC ratio.
    Type: Article , PeerReviewed
    Format: text
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  • 4
    Publication Date: 2018-10-10
    Type: Article , NonPeerReviewed
    Format: text
    Format: text
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  • 5
    Publication Date: 2019-09-23
    Description: Experimental setups to study modes of inorganic carbon acquisition and fixation rates by marine phytoplankton commonly make use of so-called disequilibrium techniques. The chemical or isotopic disequilibrium, either caused by phytoplankton cells taking up inorganic carbon or by a small disturbance of the isotopic equilibrium in the carbonate system, requires to account for the relatively slow chemical interconversion of carbon dioxide (CO2) to bicarbonate (HCO3−) in seawater. Because in such experiments a constant pH is a prerequisite, pH buffers are generally used. However, a possible influence of such buffers on the kinetics of the carbonate system has hitherto not been investigated. Here, a model of the carbonate system in seawater is employed to show how pH buffers are operating. Furthermore, a new approach is presented to determine the rate constants, k+ and k−, for the conversion reaction of CO2 to HCO3− and vice versa, by means of membrane inlet mass spectrometry (MIMS). For the two pH buffers tested (HEPES and BICINE) it is shown that measured rate constants are in good agreement with calculated values for k+ and k− in a pH range of 7 to 8.5 and at temperatures from 10 to 25 °C.
    Type: Article , PeerReviewed
    Format: text
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  • 6
    Publication Date: 2013-08-21
    Description: Climate sensitivity measures the response of Earth’s surface temperature to changes in forcing. The response depends on various climate processes that feed back on the initial forcing on different timescales. Understanding climate sensitivity is fundamental to reconstructing Earth’s climatic history as well as predicting future climate change. On timescales shorter...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 7
    Publication Date: 2014-03-26
    Description: Climate trends on timescales of 10s to 100s of millions of years are controlled by changes in solar luminosity, continent distribution, and atmosphere composition. Plate tectonics affect geography, but also atmosphere composition through volcanic degassing of CO2 at subduction zones and midocean ridges. So far, such degassing estimates were based...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 8
    Publication Date: 2014-03-26
    Description: The Paleocene-Eocene thermal maximum (PETM) may represent the best paleo-analog for rapid and massive carbon release to the ocean and atmosphere. Thus, constraining the carbon release rate at its onset is critical. Wright and Schaller (1) use records from apparently rhythmically layered shelf sediments to argue that the layering is...
    Keywords: Letters
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 9
    Publication Date: 2017-06-21
    Description: Culture experiments were carried out with the planktonic foraminifer Orbulina universa under high and low light levels in order to determine the influence of symbiont photosynthetic activity on the boron isotopic composition of shell calcite. Under low light (reduced photosynthetic rates) the boron isotopic composition of the tests is 1.5‰ lower compared to shells grown under high light (elevated photosynthetic rates). In terms of inferred pH, the lower boron isotope values correspond to a reduction in pH of approximately 0.2 units. The boron isotopic composition of Orbulina universa from plankton tows is similar to that of shells grown under low light conditions in the laboratory. These data are consistent with reduced symbiont concentrations in recently secreted shells. In addition to laboratory and field grown O. universa, we present the first data for a symbiont-barren foraminifer, Globigerina bulloides. Data obtained for G. bulloides fall ∼1.4‰ below those of the field grown O. universa. Although the plankton tow results are preliminary, they support the hypothesis that respiration and photosynthesis are the key physiological parameters responsible for species-specific vital effects.
    Type: Article , PeerReviewed
    Format: text
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  • 10
    Publication Date: 2019-09-23
    Description: Increasing atmospheric carbon dioxide (CO2) through human activities and invasion of anthropogenic CO2 into the surface ocean alters the seawater carbonate chemistry, increasing CO2 and bicarbonate (HCO3−) at the expense of carbonate ion (CO32−) concentrations. This redistribution in the dissolved inorganic carbon (DIC) pool decreases pH and carbonate saturation state (Ω). Several components of the carbonate system are considered potential key variables influencing for instance calcium carbonate precipitation in marine calcifiers such as coccolithophores, foraminifera, corals, mollusks and echinoderms. Unravelling the sensitivities of marine organisms and ecosystems to CO2 induced ocean acidification (OA) requires well-controlled experimental setups and accurate carbonate system manipulations. Here we describe and analyse the chemical changes involved in the two basic approaches for carbonate chemistry manipulation, i.e. changing DIC at constant total alkalinity (TA) and changing TA at constant DIC. Furthermore, we briefly introduce several methods to experimentally manipulate DIC and TA. Finally, we examine responses obtained with both approaches using published results for the coccolithophore Emiliania huxleyi. We conclude that under most experimental conditions in the context of ocean acidification DIC and TA manipulations yield similar changes in all parameters of the carbonate system, which implies direct comparability of data obtained with the two basic approaches for CO2 perturbation.
    Type: Article , PeerReviewed
    Format: text
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