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Relationships between Q‐factor and seawater optical properties in a coastal region
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| Zeitschriftentitel: | Limnology and Oceanography |
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| Personen und Körperschaften: | , |
| In: | Limnology and Oceanography, 46, 2001, 5, S. 1130-1140 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Wiley
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| Schlagwörter: |
| Zusammenfassung: | <jats:p>The <jats:italic>Q</jats:italic>‐factor—the ratio between upwelling irradiance and upwelling radiance—describes the bidirectional structure of seawater apparent optical properties as a function of geometry and of marine and atmospheric optical characteristics. A 3‐yr time series of Q<jats:sub>n</jats:sub>(λ) measurements—the Q‐factor determined by nadir radiance—from the North Adriatic Sea coastal waters, has been analyzed. Scatter plots of Qn(λ) versus sun zenith, θ<jats:sub>0</jats:sub>, for different intervals of the diffuse attenuation coefficient Kd(λ) have shown a consistent exponential trend. In addition, leastsquares regressions of Q<jats:sub>n</jats:sub>(λ) versus Q<jats:sub>n</jats:sub>(490) have exhibited determination coefficients R<jats:sup>2</jats:sup> that vary from 0.77 to 0.94 in the spectral range between 412 and 555 nm and R<jats:sup>2</jats:sup> = 0.50 at 665 nm. To account for these findings, an empirical model for Q<jats:sub>n</jats:sub>(λ) as a function of θ<jats:sub>0</jats:sub> and K<jats:sub>d</jats:sub>(λ<jats:sub>0</jats:sub>) at the reference wavelength λ<jats:sub>0</jats:sub> = 490 nm is proposed for North Adriatic coastal waters.</jats:p> |
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| Umfang: | 1130-1140 |
| ISSN: |
0024-3590
1939-5590 |
| DOI: | 10.4319/lo.2001.46.5.1130 |