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Browsing by Author "Pegau, W. Scott"

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Browsing by Author "Pegau, W. Scott"

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  • Absorption and attenuation of visible and near-infrared light in water: dependence on temperature and salinity 
    Pegau, W. Scott; Gray, Deric; Zaneveld, J. Ronald V. (Optical Society of America, 1997-08-20)
    We have measured the absorption coefficient of pure and salt water at 15 wavelengths in the visible and near-infrared regions of the spectrum using WETLabs nine-wavelength absorption and attenuation meters and a three-wa ...
  • Analysis of a Method to Estimate Chlorophyll-a Concentration from Irradiance Measurements at Varying Depths 
    Nahorniak, Jasmine S.; Abbott, Mark R.; Letelier, Ricardo M.; Pegau, W. Scott (American Meteorological Society, 2001-12)
    A model to estimate chlorophyll-a concentration and yellow substance absorption at 440 nm from irradiance measurements made at varying depths is examined. The derivation of the model, requiring irradiance measurements at ...
  • A comparison of methods for the measurement of the absorption coefficient in natural waters 
    Pegau, W. Scott; Cleveland, Joan S.; Doss, W.; Kennedy, C. Dan; Maffione, Robert A.; Mueller, James L.; Stone, R.; Trees, Charles C.; Weidermann, Alan D.; Wells, Willard H.; Zaneveld, J. Ronald (American Geophysical Union, 1995-07-15)
    In the spring of 1992 an optical closure experiment was conducted at Lake Pend Oreille, Idaho. A primary objective of the experiment was to compare techniques for the measurement of the spectral absorption coefficient ...
  • Effects of keels on ice bottom turbulence exchange 
    Skyllingstad, Eric D.; Paulson, Clayton A.; Pegau, W. Scott; McPhee, Miles G.; Stanton, Timothy (American Geophysical Union, 2003-12-04)
    The effects of ice keels on the upper ocean are examined using a combination of turbulence measurements and output from a large-eddy simulation (LES) model. Two cases are examined, one during the winter when the under- ...
  • The effects of physical parameters on the absorption coefficient of natural waters 
    Pegau, W. Scott (1996-02-23)
  • In Situ Determination of the Remotely Sensed Reflectance and the Absorption Coefficient: Closure and Inversion [Errata included] 
    Barnard, Andrew H.; Zaneveld, J. Ronald V.; Pegau, W. Scott (Optical Society of America, 1999-08-20)
    We tested closure between in situ radiometric and absorption coefficient measurements by using a nearly backscattering-independent remote-sensing reflectance model that employs the remote-sensing reflectance at three wav ...
  • Robust underwater visibility parameter 
    Zaneveld, J. Ronald V.; Pegau, W. Scott (Optical Society of America, 2003-11-17)
    We review theoretical models to show that contrast reduction at a specific wavelength in the horizontal direction depends directly on the beam attenuation coefficient at that wavelength. If a black target is used, the in ...
  • Simulation of turbulent exchange processes in summertime leads 
    Skyllingstad, Eric D.; Paulson, Clayton A.; Pegau, W. Scott (American Geophysical Union, 2005-05-28)
    Ice-ocean heat exchange in polar leads was examined using a large-eddy simulation model coupled to a slab ice model. Simulations were performed using an idealized square domain for a range of lead sizes, surface wind s ...
  • Spatial and temporal variability of absorption by dissolved material at a continental shelf 
    Boss, Emmanuel; Pegau, W. Scott; Zaneveld, J. Ronald; Barnard, Andrew H. (American Geophysical Union, 2001-05-15)
    Optical properties of dissolved (colored dissolved organic material (CDOM)) and particulate matter and hydrographic measurements were obtained at the Mid-Atlantic Bight during the fall of 1996 and the spring of 1997 as p ...
  • The spectral backscattering properties of marine particles 
    Whitmire, Amanda L. (2008-06-05)
    The inherent and apparent optical properties of different ocean regimes are the basis for all optical remote sensing of the ocean. Ecological information derived from remote sensors therefore relies on having a detailed ...
  • Spectral backscattering properties of marine phytoplankton cultures 
    Whitmire, Amanda L.; Pegau, W. Scott; Karp-Boss, Lee; Boss, Emmanuel; Cowles, Timothy J. (Optical Society of America, 2010-07-05)
    The backscattering properties of marine phytoplankton, which are assumed to vary widely with differences in size, shape, morphology and internal structure, have been directly measured in the laboratory on a very limited ...
  • Spectral particulate attenuation and particle size distribution in the bottom boundary layer of a continental shelf 
    Boss, Emmanuel; Pegau, W. Scott; Gardner, Wilford D.; Zaneveld, J. Ronald; Barnard, Andrew H.; Twardowski, Michael S.; Chang, G. C.; Dickey, T. D. (American Geophysical Union, 2001-05-15)
    Spectral attenuation and absorption coefficients of particulate matter and collocated hydrographic measurements were obtained in the Mid-Atlantic Bight during the fall of 1996 and the spring of 1997 as part of the Coasta ...
  • Spectral variability of the particulate backscattering ratio 
    Whitmire, Amanda L.; Boss, Emmanuel; Cowles, Timothy J.; Pegau, W. Scott (Optical Society of America, 2007-05-28)
    The spectral dependency of the particulate backscattering ratio is relevant in the fields of ocean color inversion, light field modeling, and inferring particle properties from optical measurements. Aside from theoretica ...
  • Toward closure of the inherent optical properties of natural waters 
    Pegau, W. Scott; Zaneveld, J. Ronald; Voss, Kenneth J. (American Geophysical Union, 1995-07-15)
    A fundamental relationship of inherent optical properties (IOP) is that the beam attenuation coefficient is the sum of the volume absorption and scattering coefficients (c = a + b). A relative calibration of a set of i ...

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