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Browsing Oceanography by Title
Now showing items 12-31 of 133
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Chemical and Biological Controls on Coral Nucleation
Coral reefs are vibrant and important ecosystems in the oceans, but reefs today are under threat from multiple sources. One such threat is ocean acidification due to anthropogenic climate change, which is reducing both ... -
Circulation-Informed Seafloor Geodetic Techniques for Understanding Plate Boundary Processes
Tectonic plate boundaries host a range of solid-Earth physical processes of scientific and societal interest, including the majority of the world’s volcanism and earthquakes. However, these marginal systems are primarily ... -
Climate-driven shifts in abundance, distribution, and composition of the pelagic fish community in a rapidly changing Pacific Arctic
The Chukchi Sea is experiencing rapid environmental change due to warming temperatures, reductions in sea ice, and increases in transport of warm southern-origin waters into the region. Continued changes in the physical ... -
Coastal sources of estuarine inflow
This dissertation considers the source of water that enters estuaries from the coastal ocean using a series of realistic and idealized ocean models. The first project examines the source of planktonic larvae of the marine ... -
Computational and experimental models of diatom-bacteria interaction
Microbial interactions structure ecosystems and fuel biogeochemical cycling. The metabolic activities operating in the ocean are critical to the entire planet. In this work, I focused on interactions between diatoms and ... -
Connecting sediment dynamics to coastal morphology over linked spatial and temporal scales in Myanmar and New Zealand
Low-lying coastal environments are threatened by sea-level rise (SLR), which is often locally exacerbated by anthropogenic alterations that accelerate subsidence. Managing and protecting these valuable regions requires ... -
Consequences of ocean change for ecological function:Observational and modeling case studies of larval echinoderms
(2013-02-25)Planktonic larvae of many marine invertebrates play important roles in connecting and sustaining disjunct adult populations. Most larvae are denser than seawater and rely on swimming to regulate their vertical positions. ... -
Constructing a Toolbox of Geochemical Indicators of Community Composition Shifts in Coral Reef Ecosystems Under Stress
Modern coral reef ecosystems house 25% of the planet’s entire marine biodiversity in ~ 0.1% of the surface area cover of the ocean and provide numerous ecosystem services for human populations. Unfortunately, these marine ... -
Digestion theory and applications to deposit feeders
(1988)A general theory of digestion can be derived from principles of chemical reactor theory, and three ideal reactor models, the batch reactor, plug-flow reactor (PFR), and continuous-flow, stirred-tank reactor (CSTR), are the ... -
Ecological and evolutionary strategies of archaeal, bacterial, and viral communities in deep-sea hydrothermal vents
(2014-02-24)The deep-sea hydrothermal vent habitat, formed by subsurface water-rock reactions that create high-temperature hydrothermal fluid, is dominated by physical, chemical, and mineralogical gradients. The mixing of cold, oxidized ... -
Ecology, phylogeny and physiological adaptations of euryhaline and moderately halophilic bacteria from deep-sea and hydrothermal-vent environments
(2003)The gamma-proteobacterial genus Halomonas is among the most abundant groups of microorganisms in hydrothermal-vent and pelagic habitats. Characterization of six novel Halomonas strains, including four new species isolated ... -
Eddy Circulation, Heat and Salt Balances, and Ocean Metabolism: Observations from a Seaglider-Mooring Array at Ocean Station Papa
Seagliders were deployed at Ocean Station Papa (OSP; 50N, 145W) in the southern Gulf of Alaska, augmenting a NOAA Ocean Climate Stations surface fluxes mooring and subsurface ADCP, from 8 June 2008 to 21 January 2010. ... -
Eddy Vertical Structure and Variability: vortex evolution and the geography of geostrophic turbulence
Glider observations of submesoscale and mesoscale eddy structure, behavior, and evolution are analyzed revealing both processes of eddy decay and statistical properties of geostrophic turbulence (i.e. mesoscale eddy-eddy ... -
Elucidating Temporal Variability in Organic Matter Sources and Cycling in Tropical Rivers
(2012-09-13)Tropical rivers are large sources of carbon to the atmosphere and the ocean. The composition of riverine organic matter (OM) affects the size of these fluxes by governing how much carbon will be returned to the atmosphere ... -
Elucidating the metabolic activities of SUP05, an abundant group of marine sulfur oxidizing gamma-proteobacteria
Chemoautotrophic bacteria that oxidize sulfur and reduce nitrogen in low oxygen zones carry out chemical transformations of molecules containing the key elements: carbon, nitrogen and sulfur. Members of the SUP05 clade of ... -
Energy and volume flux into the deep ocean: examining diffuse hydrothermal systems
(2004)Hydrothermal circulation plays an important role in the chemistry of the world's oceans, the biology beneath and at the seafloor---as well as within the ocean itself---and also the geology of the uppermost igneous oceanic ... -
Environmentally induced changes to the diatom cell wall and the implications of these changes on biogeochemical cycles
(2013-02-25)Diatoms are responsible for 20% of global primary production, control the marine silicon cycle, and are a major constituent of the organic matter that sinks into the deep ocean. Diatom cell walls, or frustules, are composed ... -
Equatorial wave-mean flow interaction: the long Rossby waves
(1988)The interaction of long equatorial Rossby waves with mean zonal currents in the ocean is investigated in a continuously stratified finite difference numerical model. The model allows for realistic specification of the mean ... -
Estimates of Drag Coefficients and Surface Waves under Tropical Cyclones using Subsurface EM-APEX floats
Nineteen autonomous EM-APEX floats were air-launched from aircraft to measure the profiles of ocean current velocity, temperature, salinity, and high-frequency velocity variance (σ_u ) ̃^2 under five different tropical ... -
Estimation of inherent optical properties and phytoplankton community structure from hyperspectral in-water radiometry
(2013-07-25)Inverse algorithms are developed to retrieve hyperspectral absorption and backscattering coefficients from measurements of hyperspectral upwelling radiance and downwelling irradiance in vertically homogeneous waters. The ...