Lenain Luc

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Lenain
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Luc
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  • Article
    Aerial imaging of fluorescent dye in the near shore
    (American Meteorological Society, 2014-06) Clark, David B. ; Lenain, Luc ; Feddersen, Falk ; Boss, Emmanuel S. ; Guza, R. T.
    Aerial images are used to quantify the concentration of fluorescent Rhodamine water tracing (WT) dye in turbid and optically deep water. Tracer releases near the shoreline of an ocean beach and near a tidal inlet were observed with a two-band multispectral camera and a pushbroom hyperspectral imager, respectively. The aerial observations are compared with near-surface in situ measurements. The ratio of upwelling radiance near the Rhodamine WT excitation and emission peaks varies linearly with the in situ dye concentrations for concentrations <20 ppb (r2 = 0.70 and r2 = 0.85–0.88 at the beach and inlet, respectively). The linear relationship allows for relative tracer concentration estimates without in situ calibration. The O(1 m) image pixels resolve complex flow structures on the inner shelf that transport and mix tracer.
  • Article
    Evaluation of ocean currents observed from autonomous surface vehicles
    (American Meteorological Society, 2023-10-02) Hodges, Benjamin A. ; Grare, Laurent ; Greenwood, Benjamin ; Matsuyoshi, Kayli ; Pizzo, Nick ; Statom, Nicholas M. ; Farrar, J. Thomas ; Lenain, Luc
    The development of autonomous surface vehicles, such as the Boeing Liquid Robotics Wave Glider, has revolutionized our ability to collect surface ocean–lower atmosphere observations, a crucial step toward developing better physical understanding of upper-ocean and air–sea interaction processes. However, due to the wave-following nature of these vehicles, they experience rapid shifting, rolling, and pitching under the action of surface waves, making motion compensation of observations of ocean currents particularly challenging. We present an evaluation of the accuracy of Wave Glider–based ADCP measurements by comparing them with coincident and collocated observations collected from a bottom-mounted ADCP over the course of a week-long experiment. A novel motion compensation method, tailored to wave-following surface vehicles, is presented and compared with standard approaches. We show that the use of an additional position and attitude sensor (GPS/IMU) significantly improves the accuracy of the observed currents.