Browsing Oceanography by Title
Now showing items 26-45 of 133
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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 ... -
Evaluating Physical and Biogeochemical Controls on Ocean Oxygen, Nitrate, and Carbon in Coupled Biogeochemical Ocean Circulation Models
The balance of ocean physics and the photosynthetic production and respiratory consumption of O2 dynamically links oxygen, organic carbon, and nitrate in the ocean. This thesis uses coupled biogeochemical ocean circulation ... -
Evolutionary response of marine bacteria to the co-occurring pnictogens phosphorus and arsenic
Phosphorus is an essential component of biomolecules, and is believed to be the limiting nutrient in the marine environment on geologic timescales. In marine waters, phosphorus co-occurs with arsenic, an element with many ... -
Evolving Ice-Ocean Dynamics of the Western Arctic
This dissertation examines the western Arctic Ocean and how its freshwater content and dynamics have evolved, particularly in the Beaufort Gyre circulation system north of Alaska. The recent growth of the Beaufort Sea ... -
Fine-Grained Sediment Dynamics and Morphodynamics in Tide-Dominated Channels
Rivers supply the bulk of sediment to the world ocean and are, therefore, crucial in building the foundation of coastal ecosystems and communities. As rivers approach the ocean, sediment dispersal can become dominated by ... -
Fjord sedimentation during the rapid retreat of tidewater glaciers: observations and modeling
Ice-ocean interactions remain poorly understood despite the growing recognition that they play significant roles in the complex behavior of glaciers that reach the oceans, which is of broad interest because it contributes ... -
Genomic evidence of speciation and adaptation in diatoms
(University of Washington Graduate School, 2012)Diatoms are one of the most ecologically important groups of organisms in the ocean. They are the youngest and most species-rich group of phytoplankton, having colonized both marine and terrestrial ecosystems. The ocean ... -
Global Observations of Physical and Biogeochemical Processes in the Ocean
We employ numerous global, or semi-global, datasets to observe the large-scale variability of physical and biogeochemical phenomena. In Chapter 1, we use Argo floats to estimate the vertical displacement of internal gravity ... -
Growth, chamber formation, and microscale heterogeneity in planktic foraminifera: Implications for paleoclimate proxies
The calcite tests of planktic foraminifera contain a number of geochemical proxies, which are often used to determine past ocean conditions. However, the incorporation of these proxies into the test is often affected by ... -
The heat and salt balances of the upper ocean beneath a spatially variable melting sea ice cover
(2003)The aim of this study is to paint a picture of the evolution of the horizontally variable ice-ocean boundary layer throughout summer. Observations were made during the drifting Surface HEat Balance of the Arctic (SHEBA) ... -
Hydrogen Isotopes from Lipid Biomarkers: Purification, Field Calibration, and Application to Reconstructing Galapagos Paleohydrology
(2013-11-14)The tropics are centrally important in determining global climate patters as the primary heat and moisture source for atmosphere and ocean circulation. Understanding of the range of natural variability and the sensitivity ... -
Hydrography and flow in the axial valley of the Endeavour segment: implications for larval dispersal
(2006)The axial valley of the Endeavour Segment (Juan de Fuca Ridge) is a region of intense hydrothermal activity that supports an exotic chemosynthetic ecosystem. Previous studies of circulation in the region have mostly focused ... -
Impact of the marine biological pump on atmospheric CO2 uptake in the North Pacific: a study based on basin-wide underway measurements of oxygen/argon gas ratios and pCO2
(2013-07-25)To predict how the ocean will respond to and feed back on increasing atmospheric CO<sub>2</sub> levels and climate change, we need excellent benchmark measurements of ocean primary productivity and organic carbon export ... -
Impacts of Surface Waves on Turbulence in Ocean Surface Boundary Layers: Observations and Scaling
Turbulence in the ocean surface boundary layer (OSBL) drives mixing, brings nutrients from depth, and mediates the air-sea exchange of heat, momentum, and gases and is thus a key player in the weather and climate system. ... -
Improved estimates of air-sea oxygen fluxes and biological carbon export through the use of self-calibrating Argo oxygen floats in the Pacific
The production and consumption of oxygen during photosynthesis and respiration stoichiometrically links oxygen and organic carbon in the surface ocean. Oxygen sensors are currently being deployed on profiling floats ...