Browsing Oceanography by Title
Now showing items 57-76 of 133
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Magmatic accretion of the upper oceanic crust
(1998)The focus of this work is the temporal and spatial evolution of upper oceanic crust accreted at the southern Juan de Fuca Ridge (JdFR), an intermediate rate spreading center. The area of concentrated study is along the ... -
Marine microbial biogeography from microscopic to global scales: ecology of the diatom Pseudo-nitzschia
(2013-02-25)Members of the marine diatom genus Pseudo-nitzschia are globally distributed, biologically productive, remarkably diverse, and responsible for Harmful Algal Blooms (HABs) through the production of the neurotoxin, domoic ... -
Marine microbial metabolomics: a journey through time, space, and metabolism
Microorganisms control the flux of energy, stored as organic matter, into the ocean through the cumulative effects of individual metabolisms and community interactions. Metabolites are the currency of microbial metabolism, ... -
Measured and modeled particle export in equatorial and coastal upwelling regions
(1999)The focus of this work was to improve understanding of particle cycling and export from the surface ocean in three areas: (1) methods validation, (2) description of regional and temporal variability and (3) evaluation of ... -
Mechanisms of Tropical Pacific Climate Change During the Holocene
A novel set of hydroclimate reconstructions is presented from the eastern equatorial Pacific that spans the last 9100 years. Past changes in total climatological rainfall and rainfall associated with El Niño events were ... -
Mechanisms of variability in Atlantic ocean heat transport and meridional overturning in global climate models
Meridional ocean heat transport (OHT) plays a major role in global climate. The Atlantic Ocean is particularly relevant to the global climate because its OHT is northward in both hemispheres due to the existence of the ... -
Meridional Exchanges and Mixing at the Iceland-Faroe Ridge
(2014-02-24)The Greenland-Scotland Ridge influences the exchange of warm and cold water masses between the North Atlantic and the Nordic Sea, a circulation with significant impact on global ocean circulation and climate. This study ... -
Microbial Challenges and Solutions to Inhabiting the Dynamic Architecture of Saline Ice Formations
(2013-11-14)Sea ice contains a microscopic network of brine inclusions effectively colonized by organisms from the three major clades of life. The architecture of this brine channel network is dynamic, with surface area, brine volume ... -
Microbial evolution and ecology in subzero hypersaline environments
Microbial life, particularly prokaryotic life, is prevalent in the extreme polar settings of cryopeg and sea ice brines. Cryopegs are unfrozen layers, found in Arctic permafrost below the active layer, that are composed ... -
Microbial Evolution In Sea Ice: Communities To Genes
(2009-12-15)Microbial communities encased in growing sea ice must contend with the combined stresses of low temperature and high salinity, environmental pressures that only intensify over the course of the winter. This harsh physical ... -
The microbial fate of carbon in high-latitude seas: impact of the microbial loop on oceanic uptake of CO2
(1996)This dissertation examines pelagic microbial processes in high-latitude seas, how they affect regional and global carbon cycling, and how they might respond to hypothesized changes in climate. Critical to these interests ... -
Microbial metabolomics in polar oceans: responses to temperature and salinity changes associated with sea ice.
Polar oceans and sea ice are among Earth’s major biomes, but are experiencing rapid environmental changes associated with climate change that may shift polar marine ecosystems into new, potentially unstable, states. Warming ... -
Mixing Regimes in the Amundsen Basin of the Arctic Ocean
We investigate the role of background mixing in the Arctic Ocean and how it has changed with changing forcing and ice cover. We have examined shear measurements made over more than 30 years to determine the variation in ... -
Multi-Disciplinary Applications of Oceanographic Geophysical Data Collection
Geophysical data and methods are a key source for information about geologic features beneath the seafloor that are difficult to sample directly. Our knowledge of the Earth’s structure has largely relied on our ability to ... -
A multi-scale assessment of aquatic ecosystem processes across the land-ocean-atmosphere continuum: from headlands to the sea
Freshwater systems provide a unique cross-section of earth processes, linking terrestrial, aquatic, marine, and atmospheric reservoirs. Once thought to be passive pipes connecting land to sea, rivers are increasingly ... -
Multiple effects of ocean change on crustacean zooplankton: A coupled field-laboratory approach
In this dissertation I combine laboratory experiments and field observations across natural oceanographic gradients to investigate how crustacean zooplankton will be affected by ocean acidification (OA) and other co-occurring ... -
Nearshore ice formation and sediment transport in southern Lake Michigan
(1998)The southern Lake Michigan nearshore zone is ice covered for two to four months each year. Daily observations in January 1991 document the effect of this seasonal ice on sediment transport along the Illinois shoreline of ... -
New approaches to study the marine carbon cycle
Seven years of in situ salinity and carbon dioxide (CO2) measurements from two moorings located in the North Pacific Ocean were used to evaluate transformations in mixed-layer total alkalinity (TA) and dissolved inorganic ... -
Nonlinear Internal Waves on the Washington Continental Shelf
This dissertation studies nonlinear internal waves (NLIW) on the Washington (WA) continental shelf based on 4 years' records from a moored ADCP/thermistor chain. A strong, variable wave field is documented along with their ... -
An observational study of Davis Strait transports
(2013-07-25)Davis Strait is one of two main gateways where freshwater from the Arctic enters the North Atlantic. An observing system began operating in Davis Strait in September 2004 with the goal of providing sustained, long-term ...