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 41 for “"Technology, Earth, Atmospheric, and Planetary Sciences."”.
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Igneous processes of the early solar system
Experimental, petrographic and numerical methods are used to explore the igneous evolution of the early solar system. Chapters 1 and 2 detail the results of petrographic and experimental studies of a suite of primitive achondritic meteorites, the ureilites. The first chapter presents data that …
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Rates of tectonic and magmatic processes in the North Cascades continental magmatic arc
… are among the most dynamic. geologic systems, and documentation of the magmatic, thermal, and tectonic evolution of arcs is essential for understanding the processes of magma generation, ascent and crustal growth. The primary goal of this research is to determine rates of tectonic and magmatic …
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Probabilistic state estimation in regimes of nonlinear error growth
… errors remain in regimes of linear error growth and retain distributions of Gaussian uncertainty, yet nonlinear systems like the atmosphere can readily allow regimes of nonlinear error growth and, in turn, produce distributions of non- Gaussian uncertainty. State-of-the-art, ensemble-based …
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Investigations of cloud altering effects of atmospheric aerosols using a new mixed Eulerian-Lagrangian aerosol model
Industry, urban development, and other anthropogenic influences have substantially altered the composition and size-distribution of atmospheric aerosol particles over the last century. This, in turn, has altered cloud albedo, lifetime, and patterns which together are thought to exert a negative …
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The biogeochemistry and residual mean circulation of the southern ocean
… develop conceptual models of the biogeochemistry and physical circulation of the Southern Ocean in order to study the air-sea fluxes of trace gases and biological productivity and their potential changes over glacial-interglacial timescales. Mesoscale eddy transfers play a dominant role in the …
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Global thermohaline circulation and ocean-atmosphere coupling
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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Application of an inverse model in the community modeling effort results
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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Circulations and water mass balances in the Brazil Basin
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences and Woods Hole Oceanographic Institution, 1991.
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Constraints on the petrogenesis of lavas from large plumes : inferences from geochemical studies of lavas from Mauna Kea, Hawaii, and Mt. Bureau, Kerguelen archipelago
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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Relating size and spectral reflectance properties of S-type asteroids
The spectral slopes of 701 S-type asteroids have been statistically shown to depend on asteroid size. The spectral reflectance data were taken during the second phase of the Small Main-belt Asteroid Spectroscopic Survey. It was concluded that larger S-type asteroids have a higher spectral slope …
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A transit-timing variation study of the extrasolar planet TrES-3
Portable Occultation Eclipse and Transit System (POETS) detectors [7] mounted on the Wallace Astrophysical Observatory (WAO) 0.8m and NASA Infrared Telescope Facility (IRTF) 3m telescopes are used to observe five stellar transit events of the extrasolar planet TrES-3 [5]. Model light curves are fit …
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Quantifying melting and chemical differentiation processes on Earth and the Moon
… together investigate the igneous history of the Earth and the Moon. Each chapter explores new quantitative methods for combining experiments in igneous petrology with observed local and global major and trace element compositional variations and geophysical constraints. Integrating all types of …
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Stable isotope and organic biomarker analysis of the late Proterozoic Coppercap formation in the MacKenzie Mountains
Sulfur and carbon stable isotope ratios and organic biomarker abundance were performed on drill core samples from the Coppercap Formation of the Coates Lake Group in the Windermere Supergroup of the MacKenzie Mountains to reconstruct an environmental condition proceeding the first Neoproterozoic …
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The effects of fluid pressure changes on fractured rock elastic moduli and surface deformation
… models use the elastic moduli of rock, both bulk and shear, to compute deformation. These moduli may change with pressure and fracture density, but this effect is usually left out of models. This work shows effective elastic moduli of fluid-filled fractured rock through a self consistent method. …
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Comparison of PSF fitting methods for determining centroids of stars
… magnitude effect exists, though it is very small and results in an approximate difference between residuals of between 0.02 and 0.04 pixels, which for most methods is within the fitting error. For the position on the chip effect, the vectors of the x and y residuals are produced in vector plots in …
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Organic geochemistry and stable isotope constraints on Precambrian biogeochemical processes
Details of the biogeochemical cycles and the dominant mechanisms present in Precambrian remain heavily debated topics. The events of the Late Proterozoic onset to glaciations and what types of early life existed in the Archean are two of the many provoking topics within the Precambrian. We set out …
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Sensitivity analysis of fracture scattering
… our experiments, we use a point explosive source and ignore the free surface effect, so the fracture scattering wave field contains two parts: P-to-P scattering and P-to-S scattering. We vary the fracture compliance within a range considered appropriate for field observations, 10-12 m/Pa to 10-9 …
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The Mercurian magma ocean, first crust, and implications for planetary formation mechanisms
The size of the Mercurian core and the low ferrous iron bearing silicate content of its crust offer constraints on formation models for the planet. Here we consider a bulk composition that allows endogenous formation of the planet's large core, and by processing the mantle through a magma ocean, …
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Diversity of polycyclic triterpenoids in Rhodospirillum rubrum
… many biomarkers lack known organismal sources and clear environmental contexts. Here we used Rhodospirillum rubrum, a metabolically versatile, genetically tractable c-Proteobacterium, to explore the diversity of its non-polar terpenoids as a function of growth condition and growth phase. We …
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Exploring the microbe-mediated soil H² sink : a lab-based study of the physiology and related H² consumption of isolates from the Harvard Forest LTER
Atmospheric hydrogen (H²) is a secondary greenhouse gas that attenuates the removal of methane (CH⁴) from the atmosphere. The largest and least understood term in the H² biogeochemical cycle, microbe-mediated soil uptake, is responsible for about 80% of Earth's tropospheric H² sink. A recent …
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