5,983 research outputs found

    A Comparison of the Pac-X Trans-Pacific Wave Glider Data and Satellite Data (MODIS, Aquarius, TRMM and VIIRS)

    Get PDF
    Tracy A. Villareal, Marine Science Institute and Department of Marine Science, The University of Texas at Austin, Port Aransas, Texas, United States of AmericaCara Wilson, Environmental Research Division, Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, Pacific Grove, California, United States of AmericaFour wave-propelled autonomous vehicles (Wave Gliders) instrumented with a variety of oceanographic and meteorological sensors were launched from San Francisco, CA in November 2011 for a trans-Pacific (Pac-X) voyage to test platform endurance. Two arrived in Australia, one in Dec 2012 and one in February 2013, while the two destined for Japan both ran into technical difficulties and did not arrive at their destination. The gliders were all equipped with sensors to measure temperature, salinity, turbidity, oxygen, and both chlorophyll and oil fluorescence. Here we conduct an initial assessment of the data set, noting necessary quality control steps and instrument utility. We conduct a validation of the Pac-X dataset by comparing the glider data to equivalent, or near-equivalent, satellite measurements. Sea surface temperature and salinity compared well to satellite measurements. Chl fluorescence from the gliders was more poorly correlated, with substantial between glider variability. Both turbidity and oil CDOM sensors were compromised to some degree by interfering processes. The well-known diel cycle in chlorophyll fluorescence was observed suggesting that mapping physiological data over large scales is possible. The gliders captured the Pacific Ocean’s major oceanographic features including the increased chlorophyll biomass of the California Current and equatorial upwelling. A comparison of satellite sea surface salinity (Aquarius) and glider-measured salinity revealed thin low salinity lenses in the southwestern Pacific Ocean. One glider survived a direct passage through a tropical cyclone. Two gliders traversed an open ocean phytoplankton bloom; extensive spiking in the chlorophyll fluorescence data is consistent with aggregation and highlights another potential future use for the gliders. On long missions, redundant instrumentation would aid in interpreting unusual data streams, as well as a means to periodically image the sensor heads. Instrument placement is critical to minimize bubble-related problems in the data.The authors have no support or funding to report.Marine ScienceEmail: [email protected]

    Mater In Progress…: nuevos materiales, nueva industria

    Get PDF
    Exposició: Mater In Progress… nuevos materiales,nueva industria, 8 febrero- 28 de abril 2008, Sala de exposiciones del FAD.Peer Reviewe

    Análisis de las propuestas y problemáticas que plantean los lineamientos curriculares de matemáticas en Colombia

    Get PDF
    El documento presenta un análisis de los lineamientos curriculares de matemáticas a la luz de los fundamentos teóricos que los sustentan para, de esta manera, mostrarlos como una alternativa válida de desarrollo del área

    Tax Competition in the Film Industry

    Get PDF
    Being one of the largest industries in the world, the film industry remains an economic powerhouse in our society. It’s for this reason that film’s messages are not the only political aspects of their creation. Senators and representatives across the country are increasingly seeing the film industry as key towards economic development. With incentive packages being placed around the country, the politics over the film industry have become an overwhelming power game. Politicians are being threatened with recalls and impeachment to keep their economies afloat during harsh economic times. Without raising taxes, representatives have hit a wall. Increasing debt and job shortages, in our current economy, are leading politicians to the West for economic growth. Whether film is considered a piece of art or a commercial product, state and local governments are looking West with Hollywood as the possible answer
    corecore