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 7 of 7 for “"B/Ca"”.
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Boron in Foraminiferal Calcite as an Indicator of Seawater Carbonate Chemistry
… a wide marine distribution. Many species secrete carbonate tests whose physical and chemical nature reflect the seawater conditions in which they grow. Thus, fossil tests preserved on the sea floor represent an archive that may be used to investigate the composition of ancient seawater. With the …
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Reconstructing Surface Water Carbonate Ion Concentration Changes in the Eastern Equatorial Pacific Across Glacial Transitions
… eastern equatorial Pacific (EEP) plays a critical role in the global CO<sub>2</sub> budget as a major source of CO<sub>2</sub> to the atmosphere, but recent studies suggest the region may shift to a sink for atmospheric CO<sub>2</sub> under different climate states. Here, I focus on two …
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Constraining Respired Carbon Storage in the Eastern Tropical Pacific Over the Last 25 Thousand Years Using Benthic Foraminiferal Boron/Calcium Ratios
<p>The storage of inorganic carbon in the deep Pacific Ocean is thought to play an important role in regulating both glacial-interglacial and millennial-scale atmospheric CO<sub>2</sub> concentrations (Broecker and Barker 2007; Sigman et al., 2010). A recent study by Loveley et al. (2017) showed …
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Medida de relaciones elementales e isotópicas mediante ICP-QQQ: aplicaciones analíticas
Desde su aparición en los años 80, la técnica ICP-MS se ha establecido como la herramienta analítica más poderosa para la detección elemental. Sin embargo, su aplicación a elementos de interés biológico como el S, P o Se entre otros, ha estado bastante limitada debido a sus altos potenciales de …
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Ocean circulation and carbon cycle dynamics in the Pacific Southern Ocean during Late Pleistocene interglacials
… The Pacific Ocean is the largest aquatic carbon reservoir and having a strong leverage on atmospheric CO2 concentration upon upwelling of carbon-rich CDW and subsequent CO2 release in the Pacific sector of the Southern Ocean, it is an important component regulating global climate. However, …
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Seasonal and Annual Variability In Elemental and Isotopic Proxies of Past Ocean Conditions: Results From the Guaymas and Cariaco Basins
… foraminiferal shells are controlled by the chemical and physical proprieties of the ambient seawater and can be used to reconstruct past oceanic conditions. These proxies are quantitatively defined and validated by analyzing how the geochemistry of modern foraminifera varies with changing …
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Relationships among nutrient concentrations in corn (Zea mays L.) plants and extractable soil nutrients
… corn grain yield of 8743 kg/ha. Boron application did not increase corn grain yield in field experiments on five soils. Concentrations of B, Ca, Cu, Fe, K, Mg, Mn, N, P, S, and Zn in the earleaf at the early silk growth stage were determined to assess the nutrient status of corn plants. The …