Global ETD Search
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 20 of 99 for “"pCO2"”.
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Modeling of pCO2 Point-of-Care Devices
… for a Severinghaus electrode-based point-of-care pCO2 sensor. Eight partial differential equations are derived to describe the diffusion and reaction phenomena in the sensor. The model is able to predict the potential response versus time behaviour from different CO2 concentrations in the …
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Spatio-temporal Variability in Surface Ocean pCO2 Inferred from Observations
The variability of surface ocean pCO2 is examined on multiple spatial and temporal scales. Temporal autocorrelation analysis is used to examine pCO2 variability over multiple years. Spatial autocorrelation analysis describes pCO2 variability over multiple spatial scales. Spatial autocorrelation …
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Key mechanisms of surface water pCO2 variability in the North Atlantic Ocean
… of surface water partial pressure of CO2 (pCO2) variability, both on the seasonal and inter-annual timescale. With respect to the seasonal amplitude of surface pCO2 in temperate regions (>40°N), it is found that the gyre circulation strength, in response to the winter NAO index, drives this …
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Sampling scale sensitivities in surface ocean pCO2 reconstructions in the Southern Ocean
… of partial pressure of CO2 at the surface ocean (pCO2) using machine learning (ML) and contributed to the convergence of the root mean squared errors (RMSEs) of ML methods to a common limit known in the literature as the “wall”. The hypothesis here is that addressing the critical missing sampling …
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Understanding the interannual variability of pCO2 in the sea-ice impacted Southern Ocean
… the interannual variability of oceanic pCO2 in the sea-ice-impacted Southern Ocean and identify their potential primary drivers, this thesis combines in situ observations with remotely sensed data and reanalysis models during the austral summer months. The region of focus is divided into …
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Effects of pCO2 on hydroxyapatite formation and its stability: Implications for understanding phosphorus availability in calcareous soil
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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PCO2 EFFECTS ON THE PRODUCTION OF PELAGIC BIOGENIC CARBONATE AND OCEAN CHEMISTRY: A CASE HISTORY FROM THE CRETACEOUS.
… and lithology highlighted major variations in pCO2 derived from the interplay between OJP volcanism, weathering, carbonate dissolution/precipitation and organic matter burial. Moreover, O stable isotopes concurred in the reconstruction of paleotemperatures. Ocean changes prior to, during and at …
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Observing the seasonal cycle of pCO2 from autonomous pH measurements in the South Atlantic sector of the Southern Ocean
… resolves the seasonal cycle of TA from pCO2 and pH (WGTA) and the empirical expression for TA (Lee et al., 2006) using salinity and temperature and measurements of pH. The discrepancy between WGTA and the calculated TA gives rise to a summer bias in the seasonal cycle of TA attributed to …
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Biodiversity crisis and recovery during the Triassic-Jurassic greenhouse interval: testing ocean acidification hypotheses
… to be as a result of increased atmospheric pCO2 levels. Similar morphological changes have been demonstrated for extant species exposed experimentally to high CO2 leading to the hypothesis that Late Triassic extinctions were linked with global ocean acidification and increased oceanic …
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Calculating the global flux of carbon dioxide into groundwater
… upper bound of 27.5 GtC/y. Starting with 44 soil PCO2 measurements, the dissolved inorganic carbon (DIC) of the 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 …
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Variability of the Global Ocean Carbon Sink (1998 through 2011)
… maps of the sea surface partial pressure of CO2 (pCO2) at a resolution of 1��1� for both the Atlantic Ocean from 1998 through 2007 and the global ocean from 1998 through 2011. From those, air–sea CO2 flux maps are computed using a standard gas exchange parameterization and high–resolution wind …
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Effect of future CO2 and temperature regimes on phytoplankton community composition, biomass and photosynthetic rates in the western English Channel
… under conditions predicted for the year 2100 (pCO2 elevated to 800 µatm and +4 °C temperature), three factorial experiments were conducted with natural communities sampled from the western English Channel (WEC). Elevated pCO2 increased phytoplankton biomass by up to 20-fold while elevated …
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The physiological effects of elevated carbon dioxide, in the context of non-physical fish barriers, on unionid mussels
… effects of elevated partial pressure of CO2 (pCO2) on freshwater mussels. Freshwater unionid mussels show a number of different mechanisms to buffer acidosis when they are exposed to short, long, and fluctuating elevated pCO2, and there is evidence of recovery should a CO2 stressor be removed. …
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Characterizing the effects of ocean acidification in larval and juvenile Manila clam, Ruditapes philippinarum, using a transcriptomic approach
… atmosphere increase the partial pressure of CO2 (pCO2) in the oceans. Increased pCO2 reduces the saturation of carbonate minerals required to form calcified structures. Being able to cope with the increased energetic demand of maintaining these structures, in addition to other vital physiological …
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The effects of elevated CO2 and ocean acidification on the production of marine biogenic trace gases
… investigate the relationship between increasing pCO2, decreasing pH and changes in volatile dimethylsulphide (DMS) and halocarbon concentrations, through 70,000 litre, high pCO2 mesocosm experiments and laboratory culture studies. DMS is a climatically important trace gas produced by marine …
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Relación entre la movilidad diafragmática media por ecografía y el descenso de la hipercapnia en pacientes con ventilación mecánica no invasiva.
… la VMNI en modo BiPAP con la disminución de la pCO2 en pacientes con IRH. Método: Estudio prospectivo observacional realizado en el Servicio de Urgencias del Hospital General Universitario Reina Sofía de Murcia. Se realizaron mediciones antes de iniciar la VMNI, a los 15 minutos (sin …
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OCEAN ACIDIFICATION: UNDERSTANDING THE COASTAL CARBON PUMP IN A HIGH CO2 WORLD
… investigated coastal communities, where pH and pCO2 can vary drastically. This study focused first on developing and evaluating a mesocosm and alternative method for elevating pCO2. The second goal was to determine how potential changes in phytoplankton DOC release and community structure and …
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Marine Applications of an Autonomous Indicator-Based pH Sensor
… utility of combining SAMI-pH data with in situ pCO2 data to characterize the entire inorganic carbon cycle and establish pH variability, and what drives it, in a coral reef.</p> <p>Autonomous pH and pCO2 sensors were deployed in tandem in Monterey Bay, CA from June to August 2007. The results …
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Marine Applications of an Autonomous Indicator-Based pH Sensor
… utility of combining SAMI-pH data with in situ pCO2 data to characterize the entire inorganic carbon cycle and establish pH variability, and what drives it, in a coral reef.</p> <p>Autonomous pH and pCO2 sensors were deployed in tandem in Monterey Bay, CA from June to August 2007. The results …
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Physical Oceanographic Controls on Biological Production and Ocean-Atmosphere Carbon Flux in the North Pacific
… As the partial pressure of carbon dioxide (pCO2) in the surface mixed layer exerts primary control on the direction and magnitude of air-sea carbon exchange, this study quantifies the impact of processes regulating seawater pCO2: temperature, salinity, advection of dissolved inorganic carbon …
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