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 21 for “"biogeochemical models"”.
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Weathering Pathways and Limitations in Biogeochemical Models: Application to Earth System Evolution
Current biogeochemical box models for Phanerozoic climate are reviewed and reduced to a robust, modular system, allowing application to the Precambrian. It is shown that stabilisation of climate following a Neoproterozoic snowball Earth should take more than 10(7) years, due to long-term geological …
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The effects of light, temperature and nutrients on coccolithophores and implications for biogeochemical models
… 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 laboratory experiments. The results of these experiments were then used to change the …
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Towards next generation ocean models : novel discontinuous Galerkin schemes for 2D unsteady biogeochemical models
… multi-scale, and interdisciplinary ocean models is required for better understanding and accurate predictions. The purpose of this thesis is to quantitatively identify promising numerical methods that are suitable to such predictions. In order to fulfill this purpose, current efforts …
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Not all models are created equal: assessing parameterisations of iron dynamics in ocean biogeochemical models
… As iron is such a vital nutrient for biogeochemical processes it is often included as a variable in ocean biogeochemical models. In representing the iron cycle, biogeochemical models must parameterise the major processes of uptake by phytoplankton, remineralisation and scavenging. …
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A System Dynamics Model of Soil Carbon Stock and Flows in Grasslands Under Climate and Grazing Scenarios.
… at the landscape level. While there are other biogeochemical models in existence, they are either meant to model large areas, including globally, or are meant to be at a farm level and have limited plot sizes, limiting the options for rangeland managers to test management strategies in larger …
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Towards a paradigm shift in the modeling of soil organic carbon decomposition for earth system models
… carbon cycle and climate system. Earth System Models are used to project future interactions between terrestrial ecosystem carbon dynamics and climate. However, these models often predict a wide range of soil carbon responses and their formulations have lagged behind recent soil science …
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Simulating the Impacts of Land-Use Land-Cover Changes on Cropland Carbon Fluxes in the Midwest of the United States
… geospatial information can be integrated into biogeochemical models to simulate the spatial and temporal patterns of carbon fluxes. We used the General Ensemble Biogeochemical Modeling System (GEMS) to study LULC change impacts on cropland carbon fluxes in the Midwest USA. First we evaluated …
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Linking microbes and climate : insights into the marine oxygen and nitrogen cycles with microbial metabolic functional types
… the controls on microbially-mediated marine biogeochemical cycling requires a mechanistic description of microbial activity in biogeochemical models. In the work here, the diverse microbial community is resolved using metabolic functional types, which represent metabolisms as a function of …
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Identification and characterisation of submesoscale activity over the continental shelf in the Bay of Biscay
… satellite observations and coupled physical-biogeochemical models) for targeted events in the river plumes.
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Microbial biodiversity in the southern Indian Ocean and Southern Ocean
… a step towards in the inclusion of viruses into biogeochemical models.
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Quantifying Terrestrial and Aquatic Ecosystem Methane Emissions with Process-based Biogeochemistry and Atmospheric Transport and Chemistry Models
… 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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EVALUATING THE POTENTIAL OF TEMPERATE INLAND MINERAL SOIL WETLANDS AS NATURAL CLIMATE SOLUTIONS
… of climate and the sensitivity of wetland biogeochemical properties to anthropogenic climate change, their efficacy as NCS depends on three main factors: (1) the relative warming potential of wetland GHGs (i.e. CO₂ and CH₄) in the atmosphere; (2) the relative capacity of wetlands to …
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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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Lipid Biomarkers for Marine Fungi
… carbon, thus have a profound impact on marine biogeochemical cycles. However, as little is known about their global abundance and biomass, fungi are yet to be included in biogeochemical models. <br/>Lipid biomarkers can be used to assess microbial abundance and biomass due to their specificity …
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HYDROGRAPHIC OBSERVATIONS OF OXYGEN AND RELATED PHYSICAL VARIABLES IN THE NORTH SEA AND WESTERN ROSSSEA POLYNYA investigations using seagliders, historical observations and numerical modelling
… the bottom mixed layer not currently resolved by models of the North Sea. Using the data, we were also able to constrain the relative importance of different sources of organic matter leading to oxygen consumption. iii From November 2010 to February 2011, two Seagliders were deployed in the Ross …
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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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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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Impact of spatial and temporal distribution of ammonia emissions from chemical fertilizer usage on predictions of air quality in the Midwest United States
… nitrogen deposition using chemical transport models (CTMs), require representative NH3 emission inventories that capture source specific spatial and temporal variability. Of particular interest are NH3 emissions from chemical fertilizer usage for agriculture that are highly uncertain due to …
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Shelf biogeochemical interactions and feedback processes in the Benguela upwelling system
Two coupled physical-biogeochemical models namely, (Regional Ocean Modelling System and Biogeochemical of Eastern Boundary Upwelling Systems) ROMS-BioEBUS (3D) and (Nucleus for European Modelling of the Ocean and Biogeochemical Flux Model) NEMO-BFM (1D) are applied in the Benguela upwelling system …
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