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Filtering by: Creator Navarrete, Ricardo Jr Remove constraint Creator: Navarrete, Ricardo Jr Academic Affiliation College of Oceanic and Atmospheric Sciences Remove constraint Academic Affiliation: College of Oceanic and Atmospheric Sciences

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  • The South Atlantic Ocean response to local and remote forcings

    Creator:
    Fetter Filho, Antonio F. H.
    Abstract:
    The local and remote sources of variability of the South Atlantic Ocean are investigated using a set of numerical experiments and satellite data. A global, eddy-permitting, numerical simulation is analyzed to investigate the dynamical links between the Antarctic Circumpolar Current (ACC) and the Malvinas Current (MC). The model results indicate...
    Resource Type:
    Dissertation
    Full Text:
    South Atlantic Ocean Response to Local and Remote Forcings Abstract approved: Ricardo P. Matano The

  • Phosphorus physiology and environmental forcing of oceanic cyanobacteria, primarily Trichodesmium spp.

    Creator:
    White, Angelicque E.
    Abstract:
    The biological transformation of dinitrogen gas (N2) into combined forms(termed N2 fixation) by certain genera of oceanic cyanobacteria represents the largest incoming flux of nitrogen to the global ocean. As such, biological nitrogen fixation plays a significant role in the regulation of oceanic productivity and the export of carbon and...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________________________ Ricardo M. Letelier Yvette H. Spitz The biological

  • Seconds to hour scale photosynthetic responses in marine microalgae

    Creator:
    Laney, Samuel R.
    Abstract:
    Our view of phytoplankton has historically revolved around their inability to control their location in space. The term phytoplankton itself underscores this particular difference between phytoplankton and their sessile terrestrial counterparts. Yet there are other differences between land plants and the phytoplankton that are perhaps equally important, beyond this sessile-planktonic...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: _____________________________________________________________________ Ricardo M

  • Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation

    Creator:
    Somes, Christopher J.
    Abstract:
    We present a new nitrogen isotope model incorporated into the three-dimensional ocean component of a global Earth System Climate Model designed for millennial timescale simulations. The model includes prognostic tracers for the stable nitrogen isotopes, ¹⁴N and ¹⁵N, in the nitrate (NO₃ˉ), phytoplankton, zooplankton, and detritus variables of the marine...
    Resource Type:
    Masters Thesis
    Full Text:
    invaluable to my growth as a scientist. I would like to thank my committee members Alan Mix and Ricardo

  • Formation and pathways of the intermediate water in the Parallel Ocean Circulation Model's Southern Ocean

    Creator:
    Schouten, Mathijs W. and Matano, Ricardo P.
    Abstract:
    The formation mechanisms and pathways of intermediate water in the Southern Ocean are analyzed from output of a high-resolution ocean general circulation model. Deep winter mixed layer formation in the Southern Ocean is diagnosed from the model results and is found to be mostly consistent with observations. Diapycnal water mass...
    Resource Type:
    Article
    Full Text:
    in the Parallel Ocean Circulation Model’s Southern Ocean Mathijs W. Schouten1,2 and Ricardo P

  • Production and partitioning of organic matter during simulated phytoplankton blooms

    Creator:
    Wetz, Michael S.
    Abstract:
    Few studies have examined the partitioning of organic matter in upwelling systems, despite the fact that these systems play a key role in carbon and nitrogen budgets in the ocean. We examined the production and partitioning of phytoplankton-derived organic matter in deck incubations off Oregon during the upwelling season. During...
    Resource Type:
    Masters Thesis
    Full Text:
    also thank my committee members, Ricardo Letelier, Evelyn Sherr, and Fred Prahl, for their willingness

  • Bacterioplankton in the Oregon upwelling system: distribution, cell-specific leucine incorporation, and diversity

    Creator:
    Longnecker, Krista
    Abstract:
    Marine bacterioplankton play an important role in global elemental cycles because they return carbon dioxide and nutrients to the biosphere as they reduce organic matter. Furthermore, marine bacterioplankton are not uniformly active, and subpopulations of the in situ community may be more or less active at any given time. Defining...
    Resource Type:
    Dissertation
    Full Text:
    members (Kate Field, Steve Giovannoni, Wayne Huber, and Ricardo Letelier) have also asked intriguing and

  • Prokaryotes associated with marine crust

    Creator:
    Mason, Olivia Underwood
    Abstract:
    Oceanic crust covers nearly 70% of the Earth's surface, of which, the upper, sediment layer is estimated to harbor substantial microbial biomass. Marine crust; however, extends several kilometers beyond this surficial layer, and includes the basalt and gabbro layers. In particular, the basalt layer has high permeabilities which allows for...
    Resource Type:
    Dissertation
    Full Text:
    also like to thank my committee members, Drs. Michael S. Rappé, Ricardo M. Letelier, Mario E. Magana

  • Late Quaternary paleoceanography of the Northeast Pacific and Atlantic Oceans based on diatom transfer functions

    Creator:
    Lopes, Cristina Isabel Coelho Dias
    Abstract:
    Modern upwelling conditions and corresponding oceanographic properties are investigated and reconstructed for the Late Quaternary. The oceanographic conditions considered influence diatom ecology and the record of fossil diatom frustules in the sediments. Diatoms from modern sediments are evaluated as paleoceanographic proxies and transfer functions (TFs) are calibrated using the Imbrie...
    Resource Type:
    Dissertation
    Full Text:
    committee members Nicklas Pisias, Ricardo Letelier, Peter Clark and Stephen Giovannoni and to Jim McManus

  • Dynamics of organic matter production and degradation during coastal diatom blooms

    Creator:
    Wetz, Michael S.
    Abstract:
    Experiments were designed to answer key questions about diatom-derived organic matter cycling (i.e., production and degradation) in coastal systems. Dissolved organic matter (DOM) production was examined in axenic batch cultures of five diatom species. Dissolved organic carbon (DOC) release rates varied between species, but were significantly higher for all species...
    Resource Type:
    Dissertation
    Full Text:
    ) Ricardo Letelier, who was one of the first faculty here other than Pat who I had significant