Spectral reflectance of whitecaps: Their contribution to water-leaving radiance

Karl D. Moore, Kenneth J. Voss, Howard R. Gordon

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

A radiometric system, deployed from a ship, is used to measure directly the influence of the presence of breaking waves (whitecaps) on the upwelling radiance above the sea surface. Estimates of their remote sensing augmented spectral reflectance, i.e., the temporally averaged or spatially averaged increase in the ocean's reflectance over and above the reflectance in the absence of breaking waves, are provided from measurements in the tropical Pacific. The accuracy of these estimates is dependent on their ability to determine radiometrically the background reflectance of the water. In the visible the remote sensing augmented spectral reflectance of whitecaps measured in the open ocean was found to be essentially independent of wavelength and in the range 0.001-0.002 for wind speeds of 9-12 m s-1. This is in reasonably good agreement (within a factor of 2) with earlier predictions based on the statistical relationship between fractional coverage and wind speed and the estimated average reflectance of individual whitecaps. In the near infrared (860 nm) the remote sensing augmented spectral reflectance falls to ∼80% of its value in the visible.

Original languageEnglish (US)
Article number1999JC900334
Pages (from-to)6493-6499
Number of pages7
JournalJournal of Geophysical Research: Oceans
Volume105
Issue numberC3
DOIs
StatePublished - Mar 15 2000

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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