A model for the diffuse attenuation coefficient of downwelling irradiance

The diffuse attenuation coefficient for downwelling irradiance (Kd) is an important parameter for ocean studies. For the vast ocean the only feasible means to get fine‐scale measurements of Kd is by ocean color remote sensing. At present, values of Kd from remote sensing are estimated using empirica...

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Published in:Journal of Geophysical Research. C. Oceans 2005-02, Vol.110 (C2), p.C02016.1-n/a
Main Authors: Lee, Zhong-Ping, Du, Ke-Ping, Arnone, Robert
Format: Article
Language:English
Subjects:
diffuse attenuation coefficient
Earth sciences
Earth, ocean, space
Exact sciences and technology
Marine
phase function
remote sensing
semianalytical method
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description The diffuse attenuation coefficient for downwelling irradiance (Kd) is an important parameter for ocean studies. For the vast ocean the only feasible means to get fine‐scale measurements of Kd is by ocean color remote sensing. At present, values of Kd from remote sensing are estimated using empirical algorithms. Such an approach is insufficient to provide an understanding regarding the variation of Kd and contains large uncertainties in the derived values. In this study a semianalytical model for Kd is developed based on the radiative transfer equation, with values of the model parameters derived from Hydrolight simulations using the averaged particle phase function. The model is further tested with data simulated using significantly different particle phase functions, and the modeled Kd are found matching Hydrolight Kd very well (∼2% average error and ∼12% maximum error). Such a model provides an improved interpretation about the variation of Kd and a basis to more accurately determine Kd (especially using data from remote sensing).
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source Wiley; Wiley-Blackwell AGU Digital Library
subjects diffuse attenuation coefficient
Earth sciences
Earth, ocean, space
Exact sciences and technology
Marine
phase function
remote sensing
semianalytical method
title A model for the diffuse attenuation coefficient of downwelling irradiance
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