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 25 for “"Biogeochemical model"”.
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Quantifying Terrestrial and Aquatic Ecosystem Methane Emissions with Process-based Biogeochemistry and Atmospheric Transport and Chemistry Models
… from Arctic wetlands and lakes, an integrated modeling framework was developed. It includes a newly developed process-based lake biogeochemical model and a widely used 4-D VAR inversion algorithm implemented with the nested grid high-resolution GEOS-Chem Adjoint model.
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Future potential net primary production trends of contiguous United States rangelands
… climate data projected from a global climate model (GCM) to drive the biogeochemical model (Biome-BGC) in an attempt to simulate future potential NPP trends in rangelands of the contiguous United States from 2001-2100 on a 100 km2 scale. In response to the simulated climate projections, I …
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Future potential net primary production trends of contiguous United States rangelands
… climate data projected from a global climate model (GCM) to drive the biogeochemical model (Biome-BGC) in an attempt to simulate future potential NPP trends in rangelands of the contiguous United States from 2001-2100 on a 100 km2 scale. In response to the simulated climate projections, I …
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Quantitative modeling for microbial ecology and clinical trials
… survey of a dimictic lake, an ecosystem-level biogeochemical model of microbial metabolisms in the lake, and the results of a single-cell genetic assay to infer the identity of taxonomically-diverse, putatively-syntrophic microbial consortia. In the third project, I and my co-author developed a …
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The economic impact of global climate and tropospheric oxone on world agricultural production
… Emissions Prediction and Policy Analysis (EPPA) model, a computable general equilibrium model of the world economy and crop yield results from the Terrestrial Ecosystem Model (TEM), a biogeochemical model of terrestrial vegetation. I disaggregated the original EPPA model to capture the dynamic …
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Nutrient dynamics in shallow tidally-dominated estuaries
… coupled three-dimensional (3D) hydrodynamic-biogeochemical model. To gain insight in the short temporal variability in nutrient concentrations, 24-hourly measurements of dissolved nutrients were conducted over four periods (winter, summer, start of spring, and end of spring) within one year …
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Biogeochemical Modeling of the Response of Forest Watersheds in the Northeastern U.S. to Future Climate Change
… several atmosphere ocean general circulation models (AOGCMs) under different carbon dioxide (CO2) emissions scenarios. The impacts of changing climate on terrestrial ecosystems have been assessed by observational, gradient, laboratory and field studies; however, state-of-the-art biogeochemical …
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The role of diatoms in the global carbon cycle
The Dynamic Green Ocean Model PlankTOM5.3 is a global ocean biogeochemical model representing interactions between planktonic organisms, ocean and atmosphere. The plankton is divided into five Plankton Functional Types (PFTs), each playing a specific role in carbon and nutrient cycling and in the …
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Feedback mechanism in the oceanic carbon cycle
… a simple atmosphere-ocean coupled carbon cycle model which can be used as a tool to uncover the mechanisms of the interaction between the dynamics of the atmosphere-ocean system and the oceanic reservoir of CO 2 on the 101 to 103 years time scale. The atmosphere-ocean coupled model is originally …
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Compartmental Process-based Model for Estimating Ammonia Emission from Stored Scraped Liquid Dairy Manure
The biogeochemical processes responsible for production and emission of ammonia from stored liquid dairy manure are governed by environmental factors (e.g. manure temperature, moisture) and manure characteristics (e.g. total ammoniacal nitrogen concentration, pH). These environmental factors and …
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Residual overturning circulation and its connection to Southern Ocean dynamics
… experience deep convection. I used a two layered model and a rectangular single-basin model to show that the basin width, in combination with scalings for the overturning circulation make the overturning relatively weaker in the wider basin, priming it for a convection shut down. In addition to …
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Understanding the CO₂cycle in the North Pacific Ocean using inverse box models
… exchanges of fresh water. The inverse box model was applied to data generated from the Hamburg LSGOC-biogeochemical model. For this data, the mixing transports of the tracers were important for closing the tracer budgets. Applying the inverse box model to the temperature, salinity, total …
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The seasonal cycle of CO₂ fluxes in the Southern Ocean: a model spatial scale sensitivity analysis
… over 1990 – 2009 period using five ocean biogeochemical models(BGMs) and atmospheric and ocean inversion models with monthly mean observations for the year 2000. This was done using a set of geographic boundaries to defined sub-domains of the SO consistent with the Regional Carbon Cycle …
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The biophysical processes controlling the South-East Madagascar Bloom
… in the ocean, and are fundamental to the biogeochemical cycling of elements, the storage of carbon and the ability to regulate the atmospheric carbon dioxide; and the life in the ocean. The South-East Madagascar Bloom, one of the largest blooms in the global ocean, coexists with the …
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The effects of light, temperature and nutrients on coccolithophores and implications for biogeochemical models
… in their environment due to climate change. Modellers already recognized their importance and included this group independently in global biogeochemical models. This study assesses the effect of light, temperature and nutrient availability on five coccolithophores, performing a range of …
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Effects of Acid Deposition and Changing Climate on the Hydrochemistry and Critical Loads of Watersheds in the Adirondack Region of New York
… The goals of this study were to conduct a modeling analysis of the response of soils and streams in the Adirondack Park, New York, USA to future changes in acidic deposition and climate. I conducted the research for this dissertation in three phases. In phase one, the integrated …
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Developing iodine proxies for oceanic oxygenation conditions during greenhouse episodes
… range of other geochemical data and Earth system biogeochemical model simulations. </p> <p>Iodate and iodide are the most thermodynamically stable iodine ions in seawater. The speciation of iodine depends on the redox condition of the ambient seawater. Iodate is abundant in oxic water, and iodide …
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Modeling the Effects of Acid Deposition and Natural Organic Acids on Surface Waters
… acid deposition. In this dissertation, I used a biogeochemical model, PnET-BGC, as a tool to investigate the influence of acid deposition and watershed characteristics on the extent and rate of surface water response to changes in atmospheric deposition. I applied PnET-BGC model to surface waters …
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Developing Critical Loads and Dynamic Critical Loads for Acidification for Watersheds in the Adirondack region of New York and Great Smoky Mountain National Park (GRSM)
… and ammonium deposition. In this study, a biogeochemical model (PnET-BGC) was applied to 20 watersheds in the Adirondack region and 12 watersheds in Great Smoky Mountain National Park (GRSM) to calculate CLs and DCLs. I evaluated ecosystem changes in response to historical and potential …
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