Browsing Oceanography by Title
Now showing items 37-56 of 133
-
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 ... -
Influence of breaking waves on sediment concentration profiles and longshore sediment flux in the nearshore zone
(1997)Two experiments provided data for the investigation of the influence of wave breaking on suspended sediment concentration profiles and sediment flux in the nearshore zone. A prototype wave basin experiment provided velocity ... -
Influences of mean shear in Florida current on turbulent production by internal waves
(1998)Observations of shear finestructure and turbulence in the Florida Current are analyzed to assess whether internal wave parameterizations can predict viscous dissipation rates in a vertically sheared background. Measurements ... -
Innovative Observational Global and Regional Ocean Water Mass, Circulation, and Mixing Analyses
This dissertation applies novel methodology to existing oceanographic datasets in order to gain new insights into the circulation and mixing of water masses at both regional and global scales. Given the boom of in-situ ... -
Internal Waves in the Western Arctic Ocean
The importance of internal waves in the Western Arctic Ocean is assessed using a combination of observations from Ice-Tethered Profilers drifting in the Canada Basin between Fall 2005 and Fall 2014 and numerical simulations ... -
Investigating sediment transport on the Waipaoa margin: linking in situ observations with preserved deposits
Connecting the processes that control sediment transport to the deposits they leave behind is critical for understanding sedimentary system dynamics on modern timescales. Small mountainous river systems (SMRs) have been ... -
Investigation of the Spatial and Temporal Structure of Internal Waves
A collection of field experiments and model simulations are used to investigate the spatial and temporal aspects of internal waves, with a focus on near-inertial waves and internal tides. First, the near-inertial wave field ... -
Isotopic constraints on sources and cycling of riverine dissolved inorganic carbon in the Amazon Basin
(2004)Dissolved inorganic carbon (DIC) and CO2 gas are fundamental components of riverine biogeochemical functioning. Amazonian and humid tropical rivers represent a large, neglected source of CO2 to the atmosphere. Carbon ... -
Landfast Ice Breakup Timing and Processes Along the Alaska Beaufort Sea Coast
The record minimum in the extent of drifting sea ice on the Arctic Ocean was set in 2012, and the ten lowest retreats of summer sea ice were observed in the last decade. In this thesis we investigate whether there have ... -
Large-scale Ocean Circulation Observed from Autonomous Profiling Floats
The general circulation of the ocean plays a central role in the global transport of heat, freshwater, carbon, oxygen, nutrients, and other constituents. The ocean's large-scale circulation strongly influences the ... -
Life in the cold biosphere: The ecology of psychrophile communities, genomes, and genes
The prevalence of low temperature habitats on Earth makes the ecology of organisms adapted to low temperature environments (psychrophiles) an important area of research. Studies of low temperature ecosystems including the ... -
Linking amino acid sequences to sources and fates of organic matter in aquatic systems
Proteins enact life’s intent. These macromolecules, directed by genes and informed by the environment, are the engines that power the cells of all biological entities on Earth. From viruses and bacteria to humans and blue ...