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Natural variability in eastern tropical Pacific nitrous oxide emissions
(Massachusetts Institute of Technology, 2018)
Nitrous oxide (N2O) is a powerful greenhouse gas and ozone depleting substance, but its natural sources remain poorly constrained. Marine emissions are likely much higher than IPCC estimates predict, due to unusually high ...
Nitrogen cycling in oxygen deficient zones : insights from [delta]¹⁵N and [delta]¹⁸O of nitrite and nitrate
(Massachusetts Institute of Technology, 2013)
The stable isotopes, [delta]¹⁵N and [delta]¹⁸O, of nitrite and nitrate can be powerful tools used to interpret nitrogen cycling in the ocean. They are particularly useful in regions of the ocean where there are multiple ...
Equilibration of an atmosphere by geostrophic turbulence
(Massachusetts Institute of Technology, 2013)
A major question for climate studies is to quantify the role of turbulent eddy fluxes in maintaining the observed atmospheric mean state. It has been argued that eddy fluxes keep the mid-latitude atmosphere in a state that ...
Study of induced seismicity for reservoir characterization
(Massachusetts Institute of Technology, 2013)
The main goal of the thesis is to characterize the attributes of conventional and unconventional reservoirs through passive seismicity. The dissertation is comprised of the development and applications of three new methods, ...
Estimating regional nitrous oxide emissions using isotopic ratio observations and a Bayesian inverse framework
(Massachusetts Institute of Technology, 2018)
Atmospheric nitrous oxide (N₂O) significantly impacts Earth's climate due to its dual role as an inert potent greenhouse gas in the troposphere and as a reactive source of ozone-destroying nitrogen oxides in the stratosphere. ...
A magmatic trigger for the Paleocene-Eocene thermal maximum?
(Massachusetts Institute of Technology, 2015)
Fifty-six million years ago Earth experienced rapid global warming (~6°C) that was caused by the release of large amounts of carbon into the ocean-atmosphere system. This Paleocene-Eocene Thermal Maximum (PETM) is often ...
Photometric and spectral analysis of the distribution of crystalline and amorphous ices on Enceladus as seen by Cassini
(Massachusetts Institute of Technology, 2006)
Photometric and Spectral analysis of data from the Cassini Visual and Infrared Mapping Spectrometer (VIMS) has yielded intriguing findings regarding the properties and composition of the surface of Saturn's satellite ...
Determining the focal mechanisms of earthquakes by full waveform modeling
(Massachusetts Institute of Technology, 2009)
Determining the focal mechanism of an earthquake helps us to better characterize reservoirs, define faults, and understand the stress and strain regime. The objective of this thesis is to find the focal mechanism and depth ...
Stable isotope probing of hyperthermophilic filamentous microbial communities in Octopus Spring, Yellowstone National Park
(Massachusetts Institute of Technology, 2007)
Stabe isotope probe (SIP) incubation studies were performed using ¹³C-labeled carbon substrates on hyperthermophilic filamentous streamer communities inhabiting Octopus Spring in Yellowstone National Park. Biomass was ...
Theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis
(Massachusetts Institute of Technology, 2015)
The recorded seismic signal contains full information about the source that generated the seismic waves and the path along which the seismic waves travel and interfere with subsurface. However, source information is not ...