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Showing 1 to 20 of 30 for “"carbonate system"”.
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Characterization of the Carbonate System across the Agulhas and Agulhas Return Currents
… on CO₂ variability across the Agulhas Current system ( Agulhas Current and the Agulhas Return Current). The Agulhas Current system transports heat and salt from the Indian Ocean into the South Atlantic Ocean via the Agulhas leakage, which influences the Atlantic Meridional Overturning …
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Seasonality of the marine carbonate system in the southern Benguela nutrient stoichiometry, alkalinity production, and CO flux
… to determine the seasonality of the marine carbonate system of the southern Benguela focusing on three key points: the processes driving bulk stoichiometry, alkalinity production on the continental shelf, and the air-sea flux of CO2. Monthly samples were taken along the St. Helena Bay …
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The meridional and seasonal variability of the carbonate system in the Southeast Atlantic sector of the Southern Ocean: SCALE 2019 Experiment
… regions that have emerging pH and carbonate data, distant areas like polar oceans remain seasonally undersampled. Consequently, there may be a significant gap in our understanding of biological implications of future ocean acidification (OA). This study seeks to examine the seawater …
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Seasonal and interannual variability of the marine carbonate system at the ice shelf in the eastern Weddell Gyre and its sensitivity to future ocean acidification
… CO₂ is resulting in a decrease in surface water carbonate ion concentration, a critical compound for marine calcifying organisms (Fabry et al., 2008; Orr et al., 2005). Natural seasonal variability is predicted to hasten the effects of Ocean Acidification in the Southern Ocean, resulting in …
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Physical and biological forcings on the carbonate chemistry in the North Atlantic Ocean
… atmospheric CO2 by the oceans has affected the carbonate system and caused a reduction in the pH of the oceans. Model estimates involving future CO2 emission scenarios have predicted a significant increase of oceanic Dissolved Inorganic Carbon concentrations by the end of the century, …
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Carbonate chemistry in high salinity waters
… to develop phase equilibrium diagrams for the carbonate system in high salinity waters, i.e. for single aqueous phase, solid-aqueous phase, gasaqueous phase and solid-aqueous-gas phases. Such diagrams have been developed for low salinity waters, viz. Deffeyes and Caldwell-Lawrence diagrams and …
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Modelling calcite dissolution in a rotating disc reaction vessel
The carbonate system is ubiquitous in nature, playing a role in many natural and industrial processes. For calcite dissolution, the kinetics and mass transport of the dissolved species reflect both the chemistry of the bulk, and the conditions at the dissolving interface. We formulate the …
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High Pressure NMR Studies of Supercooled Viscous Fluids
… coupling parameter. It was shown for the cyclic carbonate system, 4-methyl-1,3-dioxolan-2-one, 4-chloro-1,3-dioxolan-2-one, and 4,5-dichloro-1,3-dioxolan-2-one, that the permanent dipole plays a important role in determining the rotational-translational coupling. Using constant reduced isochoric …
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The Sequence Stratigraphic Context of Mixed Basin Margin Evaporites in the Harrisburg Member of the Permian Kaibab Formation, Northern Arizona and Southern Utah
<p>The Kaibab Formation is a mixed carbonate system including evaporites and siliciclastics deposited on a westward dipping epeiric carbonate ramp during the middle Permian in northern Arizona, southern Utah, and eastern Nevada. It consists of the Fossil Mountain Member deposited in open-marine …
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PETROGRAPHIC AND STRATIGRAPHIC ANALYSIS ALONG THE LOWER CRETACEOUS STRATA, IN KIMBLE COUNTY TEXAS
<p>The upper Trinity Group is predominantly a carbonate system with minor clastic couplets that were deposited during the Middle Cretaceous in the south Llano Uplift region. The upper Trinity Group was deposited on a southward dipping platform in the Kimble County area. Stratigraphic units of the …
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Calculating the global flux of carbon dioxide into groundwater
… was determined by equilibrium equations for the carbonate system. The calculated DIC was then multiplied by the groundwater recharge to determine the annual carbon flux per area. These PCO2 estimates were assigned to specific bio-temperatures and precipitations according to the Holdridge …
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Interplay between mineral reaction and deformation via structural defects
… The solid-solid mineral reaction between the two carbonates causes the formation of a magnesio-calcite precursor layer and a dolomite reaction rim in every experiment at isostatic annealing and deformation conditions. CHAPTER 1 briefly introduces general aspects concerning mineral reactions in …
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Monitoring the Stability of Anaerobic Digestion Using a Novel On-line Bicarbonate Alkalinity Monitor
In many biological reactors' bicarbonate ions are the major species determining pH buffering capacity, or alkalinity. In anaerobic digesters the bicarbonate levels should be within 10 to 50mM to ensure stable operation. Bicarbonate concentration in wastewater treatment processes is routinely …
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Fuels from tyres by pyrolysis in molten salts
… shown that tyre can be pyrolised, using a molten carbonate system as the reaction medium, at rates corresponding to 14.9-42.7 g tyre/min. per litre of melt over the range 475 and 650°C. The product yields by weight of tyre input between the same temperatures are: hydrocarbon oil 23-36 wt. %, …
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Environmental change impacts on shell formation in the muricid Nucella lapillus
… change is a significant threat to marine ecosystems worldwide. Ocean acidification, global warming and long-term emissions of anthropogenic effluents are all negatively impacting aquatic life. Marine calcifying organisms, in particular, are expected to be severely affected by decreasing …
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Development and demonstration of a new non-equilibrium rate-based process model for the hot potassium carbonate process.
… is developed and applied to the hot potassium carbonate process CO₂ Removal Trains at the Santos Moomba Processing Facility. The rate-based process models incorporate rigorous thermodynamic and mass transfer relations for the system and detailed hydrodynamic calculations for the column …
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Study of the organic content and mineralogy effects on the acoustic properties of the Niobrara Formation, Denver Basin
… the Greater Wattenberg Area (GWA). The Niobrara carbonate system in the Denver Basin contains a TOC range of 1-8 wt.%. Additionally, GWA is associated with a geothermal anomaly. This study investigates the effects of TOC, clay content and kerogen maturity levels on the acoustic properties of …
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Weak acid/bases and pH control in upflow anaerobic sludge bed reactors
… determination of the H₂CO₃*alkalinity (carbonate system alkalinity) and SCFA concentration in anaerobic systems to be used in, (1) assessing the H₂CO₃*alkalinity requirements of different types of wastes when treated in UASB systems, (2) monitoring process stability when treating these …
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Tracing Carbon Dynamics in the Southern Ocean and Great Barrier Reef Using Strontium and Calcium
… The study shows that CCA also buffer the carbonate system by dissolving at night, maintaining a supersaturated state favourable for reef growth. This process enhances reef resilience to ocean acidification, supporting long-term reef health.
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