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Bidirectional reflectance of oceanic waters: A comparison of modeled and measured upward radiance fieldsThe bidirectional reflectance of oceanic waters is conveniently described in a normalized way by forming the ratio of the upwelling irradiance E(sub u) to any upwelling radiance L(sub u)(theta prime, phi). This ratio, Q (theta prime, theta(sub 0), (phi(sub 0) - phi), where theta prime, phi are the nadir and azimuth angles for the upward radiance and theta(sub 0), phi(sub 0) are the zenith and azimuth angles of the Sun, has been determined from measurements at sea and computed via Monte Carlo simulations using the inherent optical properties measured in the field and appropriate boundary conditions (clear sky, no wind, varying Sun angle). Experimental ad computed Q values are in excellent agreement. This successful comparison confirms the importance of the bidirectional character of ocean reflectance, already pointed out from a purely numerical approach without field validation, and corroborates the extended range of the Q variations. The later point is of importance when interpreting the marine signals detected by an ocean color satellite-borne sensor. The validation is extended by considering the historical data for the radiance distributions in Lake Pend Oreille determined at various depths. The closure issue in ocean optics is examined by solving the direct problem of radiative transfer and through a model-data comparison in terms of radiance field.
Document ID
19950062260
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Morel, Andre
(Univ. Pierre et Marie Curie et CNRS Villefranche, France)
Voss, Kenneth J.
(Univ. of Miami, Coral Gables, FL United States)
Gentili, Bernard
(Univ. Pierre et Marie Curie et CNRS Villefranche, France)
Date Acquired
August 16, 2013
Publication Date
July 15, 1995
Publication Information
Publication: Journal of Geophysical Research
Volume: 100
Issue: C7
ISSN: 0148-0227
Subject Category
Oceanography
Accession Number
95A93859
Funding Number(s)
CONTRACT_GRANT: NAGW-273
CONTRACT_GRANT: NOOO14-90-1505
CONTRACT_GRANT: NAG5-31363
Distribution Limits
Public
Copyright
Other

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