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Now showing items 3311-3320 of 3341
Ground motions and source mechanisms of earthquakes in multiscales : microseismicity to macroseismicity
(Massachusetts Institute of Technology, 2016)
This thesis focuses on the source mechanisms of Earthquakes of different scales, from the micro-seismicity in oil/gas fields in Oman, to moderate earthquakes in Kuwait, and finally to pico-seismicity, i.e. acoustic emission, ...
Little Ice Age climate in the western tropical Atlantic inferred from coral geochemical proxies
(Massachusetts Institute of Technology, 2016)
Paleoclimate archives place the short instrumental record of climate variability in a longer temporal context and allow better understanding of the rate, nature and extent by which anthropogenic warming will impact natural ...
Submesoscale turbulence in the upper ocean
(Massachusetts Institute of Technology, 2016)
Submesoscale flows, current systems 1-100 km in horizontal extent, are increasingly coming into focus as an important component of upper-ocean dynamics. A range of processes have been proposed to energize submesoscale ...
Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective
(Massachusetts Institute of Technology, 2014)
The great geologic and climatic diversity of the Fraser River basin in southwestern Canada render it an excellent location for understanding biogeochemical cycling of sediments and terrigenous organic carbon in a relatively ...
Investigating the role of Trichodesmium spp. in the oceanic nitrogen cycle through observations and models
(Massachusetts Institute of Technology, 2014)
This work concerns the nitrogen fixation and abundance of Trichodesmium colonies in the western subtropical-tropical North Atlantic and their connections with physical processes. Data were collected in fall 2010 and spring ...
A dynamo case study of Mercury, and the early orbital and thermal evolution of the Moon
(Massachusetts Institute of Technology, 2017)
Mercury's magnetic field is characterized by its weak strength, spin-aligned axisymmetry and a large offset of the magnetic equator relative to Mercury's geographic equator. The combination of these features is difficult ...
Spectral mapping and long-term seasonal evolution of Pluto
(Massachusetts Institute of Technology, 2018)
NASA's New Horizons mission has provided a wealth of new data about the Pluto system, including detailed surface geology and volatile distribution maps revealing striking latitudinal and longitudinal variations. We begin ...
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. ...
Reconstructing atmospheric changes in monsoon regions using eolian dust
(Massachusetts Institute of Technology, 2019)
Mineral dust is generated in continental interiors and exported by winds to ocean basins, providing a sedimentary archive which is one of the few direct indicators we have of atmospheric circulation in the past. This archive ...
The cobalt cycle in the tropical Pacific Ocean
(Massachusetts Institute of Technology, 2017)
Although over a dozen elements are needed to support phytoplankton growth, only a few are considered to be growth-limiting. As the central atom in vitamin B12, cobalt is crucial for metabolism, but its status as a limiting ...