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| Titel |
On the influence of wind and waves on underwater irradiance fluctuations |
| VerfasserIn |
M. Hieronymi, A. Macke |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 8, no. 4 ; Nr. 8, no. 4 (2012-07-10), S.455-471 |
| Datensatznummer |
250005744
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| Publikation (Nr.) |
 copernicus.org/os-8-455-2012.pdf |
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| Zusammenfassung |
| The influence of various wind and wave conditions on the variability of
downwelling irradiance Ed (490 nm) in water is subject of this study.
The work is based on a two-dimensional Monte Carlo radiative transfer model
with high spatial resolution. The model assumes conditions that are ideal
for wave focusing, thus simulation results reveal the upper limit for light
fluctuations. Local wind primarily determines the steepness of
capillary-gravity waves which in turn dominate the irradiance variability
near the surface. Down to 3 m depth, maximum irradiance peaks that exceed
the mean irradiance Ed by a factor of more than 7 can be observed at low wind speeds up to
5 m s−1. The strength of irradiance fluctuations can be even amplified
under the influence of higher ultra-gravity waves; thereby peaks can exceed
11 Ed. Sea states influence the light field much deeper; gravity waves can cause
considerable irradiance variability even at 100 m depth. The simulation
results show that under realistic conditions 50% radiative enhancements
compared to the mean can still occur at 30 m depth. At greater depths, the
underwater light variability depends on the wave steepness of the
characteristic wave of a sea state; steeper waves cause stronger light
fluctuations. |
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