Browsing Doctoral Theses by Subject "Earth, Atmospheric, and Planetary Sciences."
Now showing items 1-20 of 654
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440 MHz radar observations of plasma turbulence in the auroral lower ionosphere
(Massachusetts Institute of Technology, 1989) -
Abrupt climate change in the Atlantic Ocean during the last 20,000 years : insights from multi-element analysis of benthic and planktic foraminifera and coupled OA-GCM
(Massachusetts Institute of Technology, 2005)Minor and trace element records of planktic and benthic foraminifera from Atlantic sediment cores, as well as output from a coupled OAGCM, were used to investigate the magnitude and distribution of the oceanic response to ... -
Accelerated settling of particulate matter by 'marine snow' aggregates
(Massachusetts Institute of Technology, 1986) -
Acoustic logging in fractured and porous formations
(Massachusetts Institute of Technology, 1990) -
Active tectonics and seismicity of New Guinea
(Massachusetts Institute of Technology, 1990) -
Adaptive error estimation in linearized ocean general circulation models
(Massachusetts Institute of Technology, 1999)Data assimilation methods, such as the Kalman filter, are routinely used in oceanography. The statistics of the model and measurement errors need to be specified a priori. In this study we address the problem of estimating ... -
Advanced geophysical studies of accretion of oceanic lithosphere in Mid-Ocean Ridges characterized by contrasting tectono-magmatic settings
(Massachusetts Institute of Technology, 2012)The structure of the oceanic lithosphere results from magmatic and extensional processes taking place at mid-ocean ridges (MORs). The temporal and spatial scales of the variability of these two processes control the degree ... -
Advances in measurements of particle cycling and fluxes in the ocean
(Massachusetts Institute of Technology, 2013)The sinking flux of particles is an important removal mechanism of carbon from the surface ocean as part of the biological pump and can play a role in cycling of other chemical species. This work dealt with improving methods ... -
Advancing the theory and applications of Lagrangian Coherent Structures methods for oceanic surface flows
(Massachusetts Institute of Technology, 2019)Ocean surface transport is at the core of many environmental disasters, including the spread of marine plastic pollution, the Deepwater Horizon oil spill and the Fukushima nuclear contamination. Understanding and predicting ... -
Aerosol-Cloud interactions : a new perspective in precipitation enhancement
(Massachusetts Institute of Technology, 2010)Increased industrialization and human activity modified the atmospheric aerosol composition and size-distribution during the last several decades. This has affected the structure and evolution of clouds, and precipitation ... -
Age of air and the circulation of the stratosphere
(Massachusetts Institute of Technology, 2017)The circulation of air in the stratosphere is important for the distribution of radiatively-important trace gases, such as ozone and water vapor, and other chemical species, including ozone-depleting chlorofluorocarbons. ... -
Air-sea interaction at contrasting sites in the Eastern Tropical Pacific : mesoscale variability and atmospheric convection at 10°N
(Massachusetts Institute of Technology, 2007)The role of ocean dynamics in driving air-sea interaction is examined at two contrasting sites on 125°W in the eastern tropical Pacific Ocean using data from the Pan American Climate Study (PACS) field program. Analysis ... -
Ambient noise interferometry and surface-wave array tomography in southeastern Tibet
(Massachusetts Institute of Technology, 2009)The primary goal of my doctoral research is to understand the crustal and upper mantle structure and deformation in southeastern Tibet. To improve the resolution in the crust, we developed a new approach for surface-wave ... -
Ambient noise tomography for wavespeed and anisotropy in the crust of southwestern China
(Massachusetts Institute of Technology, 2014)The primary objective of this thesis is to improve our understanding of the crustal structure and deformation in the southeastern Tibetan Plateau and adjacent regions using surface wave tomography. Green's functions for ... -
Amplitude and phase variations of surface waves in a laterally heterogeneous earth : ray- and beam-theoretical approach
(Massachusetts Institute of Technology, 1986) -
Amundsen Sea sea-ice variability, atmospheric circulation, and spatial variations in snow isotopic composition from new West Antarctic firn cores
(Massachusetts Institute of Technology, 2014)Recent work has documented dramatic changes in the West Antarctic Ice Sheet (WAIS) over the past 30 years (e.g., mass loss, glacier acceleration, surface warming) due largely to the influence of the marine environment. ... -
Analysis of certain inviscid flows on the beta plane
(Massachusetts Institute of Technology, 1986) -
An analytic study of the baroclinic instability problem on the sphere
(Massachusetts Institute of Technology, 1987) -
Anisotropy and deformation in the Earth's mantle : seismological observations, geodynamical models, and laboratory experiments
(Massachusetts Institute of Technology, 2006)In this thesis I report the results of several studies of elastic anisotropy and deformation in the Earth's mantle, using shear wave splitting measurements, numerical models of geodynamical processes, and laboratory ... -
Annular mode-like responses to external forcings in a simple atmospheric general circulation model
(Massachusetts Institute of Technology, 2008)In this thesis, I investigate the response of a simple atmospheric general circulation model to applied forcings to learn whether the annular mode patterns are a preferred model response to the forcings. The thesis is ...