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 8 of 8 for “"pCO2 levels"”.
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Ocean acidification: physiological response from fish to cell
… at an unusually rapid rate, from pre-industrial levels of 280 μatm to current levels of 414 μatm. The oceans, one of the largest CO2 reservoirs, continuously absorb the atmospheric CO2, resulting in a decline of ocean pH and a decrease in carbonate saturation state. The study of the physiological …
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Fluvial sequence stratigraphy and paleoclimate of the Upper Triassic (Norian-Rhaetian) Chinle Strata, northern New Mexico.
… two age-equivalent, relatively continuous pCO2 and temperature records that span the eight million years preceding the Triassic-Jurassic (T-J) boundary. The [delta]13C data reveal relatively low Late Norian pCO2 levels (<500 to 1,000 ppmV), increased Rhaetian levels (>1,500 ppmV), and at …
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Palaeoclimatology, stratigraphy and biotic responses in the middle Eocene
… and higher atmospheric carbon dioxide (pCO2) levels than today with only<br/>small/non-existant icesheets. Because predicted pCO2 levels for the coming century have not been seen on Earth since at least ~40 Ma thus, the primary objective of this thesis is to improve our understanding of …
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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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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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Growth and development of larval bay scallops (Argopecten irradians) in response to early exposure to high CO2
… experience large variability and rapid shifts in pCO2 levels. Elevated pCO2, or ocean acidification, often negatively affects early life stages of calcifying marine invertebrates, including bivalves, but it is unclear which developmental stage is most sensitive. I hypothesized that initial …
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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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Bioaccumalation of metals in mullet from Mhlathuze Estuary and the effect of Cu and Pb on the uptake kinetics,haematology and acid-base balance of Liza dumerelii.
… up by biota to concentrations far above ambient levels. This is termed bioaccumulation. The accumulation of metals in biota can result in stress, which can in turn induce changes in physiological parameters and other metabolic processes. The need to understand and predict the stress conditions, …