Browsing Oceanography by Title
Now showing items 69-88 of 92
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Sediment dispersal and accumulation in an insular sea: deltas of Puget Sound
(2014-02-24)Small rivers carry several million tons of sediment annually into Puget Sound and the Strait of Juan de Fuca. Once delivered to the marine environment, processes in the water column and on the seabed dictate dispersal, ... -
Sediment dynamics and deposits along the fluvial–marine transition: Tidal river to mangrove coast
Rivers supply the vast majority of sediment that reaches the global ocean. As many rivers approach the sea, they experience tidal influence in the absence of salinity, along a reach known as the tidal river. As a result, ... -
Sediment dynamics in tidal environments spanning a range of fluvial influence
A full understanding of the transport of sediment from terrestrial source to marine sink requires knowledge of dynamics in a multitude of intermediate environments with both fluvial and marine influences. Two of these ... -
Shifting role of chemoautotrophic SUP05 bacteria in nitrogen, sulfur and carbon cycles across oxygen gradients in marine environments
Microbes make up a large percentage of the biomass within marine environments and play a key role in cycling of biogeochemical cycles. Despite this, majority of important species of bacteria and archaea remain poorly ... -
Slope and shelf processes associated with upwelling in the northern California Current system
(2013-02-25)The northern California Current system (CCS) experiences relatively weak upwelling-favorable wind stress during summer months, but high nutrient concentrations and hypoxic conditions occur seasonally. This study examines ... -
Stratification at Ocean Fronts
The large-scale changes of temperature and salinity in the ocean are not smooth and continuous, but comprise many smaller, sharper gradients. In regions of strong lateral density contrasts, sharp density fronts can slump, ... -
A study of the survival of Alexandrium cysts in natural sediments and their utility to reconstruct harmful algal blooms in the Pacific Northwest
Harmful algal blooms (HABs) produced by the potentially toxic dinoflagellate genus Alexandrium are a natural phenomenon that have been present in the Pacific Northwest since at least the late 1700s. Alexandrium can produce ... -
Sub-seasonal wind variability and El Niño
(2000)The role of sub-seasonal western and central Pacific surface zonal wind variability in the evolution of El Nino sea surface temperature anomaly (SSTA) is examined. The surface wind structure and atmospheric convection ... -
Tannin geochemistry of natural systems: method development and application
(1999)Polyphenolic tannin comprises a significant proportion of the leaves, needles, and barks of vascular plant tissues---all major contributors to terrigenous organic matter cycling in aquatic systems. However, virtually nothing ... -
The balance between prokaryotic autotrophy and heterotrophy in the oceans
Bacteria play in integral role in the marine carbon cycle by mediating crucial transformations of organic and inorganic matter. Within the organic carbon pool, heterotrophic bacteria control the flux of labile and recalcitrant ... -
The biogeochemistry of particulate trace elements and isotopes in the North Atlantic Ocean
The distributions and bioavailability of trace metals and their isotopes are strongly controlled by partitioning between the dissolved phase and suspended and sinking biotic and abiotic particles. This work presents new ... -
The lifestyles of viruses in the sunlit ocean revealed through isolation, genomics, and infection dynamics
In the sunlit ocean, heterotrophic and photosynthetic microbes are prey for earth’s most abundant predators. Viruses are regulators of microbial communities, terminating phytoplankton blooms, altering biogeochemical cycles ... -
The North Pacific biological pump: Rates, efficiency and influence on ocean carbon uptake
The North Pacific features a band of strong atmospheric CO2 uptake at the transition between the subarctic and subtropical gyres, making it a region of particular importance to quantify the rates and mechanisms of ocean ... -
The Power and Promise of Direct Measurements of Metabolites in Marine Systems
Organic molecules play a myriad of roles in the surface ocean. They are the building blocks of proteins, the alphabet of genetic information, and the language in which microorganisms communicate. The small biomolecules ... -
The response of thermocline ventilation to variability at the ocean surface from observations and offline tracer modeling
Variability in oceanic ventilation can arise from either changes at the surface of the ocean or the ocean interior. Four studies are presented which advance our understanding on how these changes can be diagnosed in both ... -
Transport and bottom boundary layer observations of the North Atlantic deep western boundary current at the Blake Outer Ridge
(1998)The North Atlantic Deep Western Boundary Current (DWBC) was surveyed at the Blake Outer Ridge over 14 days in July and August 1992 to determine its volume transport and to investigate its bottom boundary layer (BBL). This ... -
Tropical paleoclimate reconstructions from stable isotopes of mangrove lipid biomarkers
Tropical oceans play an integral role in global climate dynamics, yet past tropical hydrologic variability is poorly constrained, as many established climate proxies are better suited to higher latitudes. Hydrogen isotope ... -
Tropical South Pacific Paleohydrology from Hydrogen Isotopes in Algal Lipids
The tropics play a central role in global atmospheric moisture transport, however paleoclimate records of tropical precipitation are relatively scarce. Reconstructing pre-instrumental hydrological change requires the use ... -
Turbulent entrainment fluxes within the eastern Pacific warm pool
(2007)Mechanisms controlling turbulent entrainment fluxes, or vertical turbulent fluxes at the mixed layer base (z = -h), and the specific influence of heat entrainment on SST within the eastern Pacific warm pool (EPWP) are ... -
Uncovering Mechanisms of Phytoplankton Response to Climate Change
Phytoplankton are responsible for approximately half the primary production on earth, fueling marine food webs and driving the cycling of carbon and inorganic nutrients in the oceans. Climate change is predicted to alter ...