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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"carbon chemistry"”.
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Carbon Chemistry Of Giant Impacts
… combined with static mass spectrometry to give carbon isotopic analysis of individual diamonds. graphite and acid-residues indicate that the primary carbon source is graphite. This graphite was found to be <sup>13</sup>C depleted with respect to similar samples from the Popigai impact crater. …
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OCEAN ACIDIFICATION: UNDERSTANDING THE COASTAL CARBON PUMP IN A HIGH CO2 WORLD
Since the 1800s, carbon dioxide emissions due to human activities have contributed significantly to the amount of carbon in the atmosphere. Approximately a third of this carbon is absorbed by the ocean, through air-sea fluxes at the ocean surface (Sabine, 2004). Increased CO2 has changed the carbon …
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Climate change and anthropogenic effects on shallow-water carbonate biogeochemistry
… state of surface ocean waters with respect to carbonate minerals will decline during the twenty-first century owing to increasing atmospheric CO2. As a result calcareous organisms could have difficulty calcifying, leading to production of weaker skeletons and their greater vulnerability to …
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Uncertainty in atmospheric CO₂ concentrations from a parametric uncertainty analysis of a global ocean carbon cycle model
Key uncertainties in the global carbon cycle are reviewed and a simple model for the oceanic carbon sink is developed and described. This model for the solubility sink of excess atmospheric CO2 has many enhancements over the more simple 0-D and 1-D box-diffusion models upon which it is based, …
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Mechanisms of Coral Calcification: a Geochemical and Computational Approach to Understanding Biomineralisation
… marine ecosystem and play a critical part in the carbon cycle and climate feedbacks. In the face of a rapidly changing climate, the future of these reefs is uncertain. Corals also provide us with an invaluable archive of past ocean conditions through the impurities incorporated into their …
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Development of low-cost in situ gas sensors for oceanographic applications
Anthropogenic activity has increased atmospheric carbon dioxide (CO2) levels, disrupting the global carbon cycle and driving widespread environmental change. The ocean acts as a major sink. Accurate and scalable in situ monitoring of oceanic carbon chemistry is vital for understanding the impacts …
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ASSESSING DYNAMICS AND TRENDS OF CO2 FLUX ON THE LOUISIANA SHELF
… the influences different variables have on the carbon chemistry of the water over varying timescales. Four main hypotheses are addressed in order to establish trends and examine key factors influencing air-sea CO<sub>2</sub>flux on the Shelf. We first determined if the Louisiana Shelf followed …
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Development of Low-Cost In Situ Gas Sensors for Oceanographic Applications
Anthropogenic activity has increased atmospheric carbon dioxide (CO₂) levels, disrupting the global carbon cycle and driving widespread environmental change. The ocean acts as a major sink. Accurate and scalable in situ monitoring of oceanic carbon chemistry is vital for understanding the impacts …
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Instrumentation and development of a mass spectrometry system for the study of gas-phase biomolecular ion reactions
… a powerful tool in investigating gas-phase ion chemistry. Various mass spectrometers have been developed to explore ion/molecule reactions, ion/ion reactions, ion/photon reactions, ion/radical reactions etc., both at atmospheric pressure and in vacuum. In-vacuum reactions have an advantage of …
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The dynamics of ¹³C in several New Zealand lakes
… assessed by monitoring the dissolved inorganic carbon chemistry of an eutrophic pond during a period of high insolation and algal productivity. These observations revealed that during the day, the Pc0₂ in the euphotic zone was reduced to levels low enough to affect. photosynthetic carbon …
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Freshwater Endmembers Impacting Carbonate Chemistry in the Mississippi Sound
… ecosystems are highly dynamic areas for carbon cycling and are likely to be negatively impacted by increasing ocean acidification. This research focused on dissolved inorganic carbon (DIC) and total alkalinity (TA) in the Mississippi Sound in order to understand the influence of local …
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A study of the remineralization of organic carbon in nearshore sediments using carbon isotopes
A study of the remineralization of organic carbon was conducted in the organic-rich sediments of Buzzards Bay, MA. Major processes affecting the carbon chemistry in sediments are reflected by changes in the stable carbon isotope ratios of dissolved inorganic carbon (ΣCO2) in sediment pore water. …
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A study of the remineralization of organic carbon in nearshore sediments using carbon isotopes
A study of the remineralization of organic carbon was conducted in the organic-rich sediments of Buzzards Bay, MA. Major processes affecting the carbon chemistry in sediments are reflected by changes in the stable carbon isotope ratios of dissolved inorganic carbon (XCO2) in sediment pore water. …
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Design and Development of New Catalytic Carbon-Carbon Bond Forming Reactions: I. N-Heterocyclic Carbene Based Catalytic Platform for Hauser-Kraus Annulations II. Copper-Catalyzed Selective Allylic Alkylation of Allylic Systems Using Grignard Reagents
The construction of carbon-carbon bonds has always been at the forefront of synthetic organic chemistry for generating products of greater utilities. Owing to their extraordinary applications in the synthesis of a wide range of therapeutic small molecules and natural products, the design and the …