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Abstract

The Q-factor - the ratio between upwelling irradiance and upwelling radiance - describes the bi-directional structure of seawater apparent optical properties as a function of geometry and of marine and atmospheric optical characteristics. A 3-yr time series of Qn (lambda) measurements - the Q-factor determined by nadir radiance - from the North Adriatic Sea coastal waters, has been analysed. Scatter plots of Qn (lambda) versus sun zenith, theta0, for different intervals of the diffuse attenuation coefficient Kd (lambda) have shown a consistent exponential trend. In addition, least-squares regressions of Qn(lambda) versus Qn(490) have exhibited determination coefficients R(2) that vary from 0.77 to 0.94 in the spectral range between 412 and 555nm and R(2) = 0.50 at 665nm. To account for these findings, an empirical model for Qn(lambda) as a function of theta0 and Kd(lambda0) at the reference wavelength lambda0 = 490 nm is proposed for North Adriatic waters.

Additional information

Authors: ZIBORDI G, European Commission, Joint Research Centre, Space Applications Institute, Ispra (IT);BERTHON J-F, European Commission, Joint Research Centre, Space Applications Institute, Ispra (IT)
Bibliographic Reference: An article published in: Limnology and Oceanography, 46 (5), (2001), pp. 1130-1140
Record Number: 200214481 / Last updated on: 2002-03-28
Category: PUBLICATION
Original language: en
Available languages: en