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 128 for “"earth system"”.
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Stratospheric ozone in the Earth system
Ozone in the stratosphere protects life on Earth by absorbing much of the ultraviolet solar radiation, as well as being a major source of ozone to the troposphere. A number of factors can influence stratospheric ozone levels and explain past, present and future changes. While there is a large …
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On intrinsic uncertainties in earth system modelling
Uncertainties are pervasive in the Earth System modelling. This is not just due to a lack of knowledge about physical processes but has its seeds in intrinsic, i.e. inevitable and irreducible, uncertainties concerning the process of modelling as well. Therefore, it is indispensable to quantify …
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Four problems in nonlinear Earth system dynamics
The Earth system — the interconnected global set of living and non-living systems comprising our planet — has undergone profound changes throughout its history. Some were slow and gradual; others dramatic and seemingly abrupt. The latter include “hyperthermal” global warming events, “Snowball …
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Machine learning for earth system observation and forecasting
… explore the idea of replacing complex, expensive systems for earth system observation and forecasting with simple, streamlined machine learning models that achieve superior performance at a fraction of the cost. Three separate applications of this idea are investigated. We begin by developing …
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Effective reuse of coupling technologies for Earth System Models
Designing and implementing coupled Earth System Models (ESMs) is a challenge for climate scientists and software engineers alike. Coupled models incorporate two or more independent numerical models into a single application, allowing for the simulation of complex feedback effects. As ESMs increase …
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Design of the interconnection network for the EARTH system
… high-bandwidth interconnection network for the EARTH multithreaded multiprocessor system. The interconnection network consists of a hierarchy of 4 x 4 crossbar switches, and a network interface on each EARTH processor node. The interconnection network is capable of transferring multiple messages …
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Uncertainty Quantification in Earth System Models Using Polynomial Chaos Expansions
… work explores stochastic responses of various earth system models to different random sources, using polynomial chaos (PC) approaches. The following earth systems are considered, namely the HYbrid Coordinate Ocean Model (HYCOM, an ocean general circulation model (OGCM)) for the study of ocean …
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Weathering Pathways and Limitations in Biogeochemical Models: Application to Earth System Evolution
… 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 limitation of global weathering rates. The timescale …
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Interactions of Vegetation and Climate: Remote Observations, Earth System Models, and the Amazon Forest
The natural composition of terrestrial ecosystems can be shaped by climate to take advantage of local environmental conditions. Ecosystem functioning, e.g. interaction between photosynthesis and temperature, can also acclimate to different climatological states. The combination of these two factors …
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Application of the hector-brick reduced complexity earth system model for probabilistic climate projection
… expansion information to understand the climate system, none have simultaneously accounted for centennial scale down to decadal scale temperature change simultaneous with ocean heat constraints, as is implicit in our calibration process. This work was published in Earth’s Future (Vega-Westhoff et …
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Investigating tropical cyclone-climate interactions using the high-resolution Community Earth System Model (CESM)
Made available in DSpace on 2018-09-04T20:47:23Z (GMT). No. of bitstreams: 3 LI-DISSERTATION-2018.pdf: 17879372 bytes, checksum: e4ed4e5d3e31d6edb0f75746ea54021a (MD5) LICENSE.txt: 4203 bytes, checksum: 2747f14671ae1e47b4dfe239d9040807 (MD5) PROQUEST_LICENSE.txt: 4549 bytes, checksum: …
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Towards a paradigm shift in the modeling of soil organic carbon decomposition for earth system models
… role in the global 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 …
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The importance of ocean internal variability for coupled climate modeling in the community earth system model
… types of uncertainties involved in modeling the Earth’s climate system is of high importance as processes within the climate system are chaotic and challenging to predict. This dissertation contains a comprehensive quantification of climate uncertainty, focusing primarily on the uncertainty due …
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Environmental changes and regime shift analysis in the southern Benguela using output from earth system models
… emissions has triggered profound changes in Earth's climate, affecting marine ecosystems and fisheries globally. This study focuses on the southern Benguela, an integral region of the southern African Eastern Boundary Upwelling System (EBUS), investigating the potential impacts of climate …
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Evaluating the interactions of crop management, carbon cycling, and climate using Earth system modeling and remote sensing
… Inclusion of crop management practices in Earth system models used for assessing global climate is a key requirement for evaluating the overall effects of different crop management practices on C cycling and their potential to mitigate climate change. Studies in this dissertation seek to …
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What to plant and where to plant it; Modeling the biophysical effects of North America temperate forests on climate using the Community Earth System Model
… heat flux. In this study we used the Community Earth System Model to assess the biophysical effect of North American temperate forests on climate and how this effect changes with location, tree type, and forest management. We calculated the change in annual temperature and energy balance …
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Effects of Terrestrial Weathering on Rare Earth Element Concentrations and Sulfur Isotopic Signatures of Carbonaceous and Ordinary Chondrites
… information about the formation of our solar system, as well as a more detailed account of the mobilization of chondritic compounds when they encounter terrestrial conditions. Elemental concentrations and stable isotope analyses of chondrites, considered to be the most primordial material in …
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