Solar radiative transfer into the ocean [Elektronische Ressource] : a study on underwater light fluctuations due to surface waves / vorgelegt von Martin Hieronymi

Solar Radiative Transfer into the Ocean: A Study on Underwater Light Fluctuations due to Surface Waves Dissertation zur Erlangung des Doktorgrades der Mathematisch-Naturwissenschaftlichen Fakultät der Christian-Albrechts-Universität zu Kiel vorgelegt von Dipl.-Ing. Martin Hieronymi Kiel, 2011 Referent: Prof. Dr. Andreas Macke Korreferent: Prof. Dr. Oliver Zielinski Tag der mündlichen Prüfung: 13. Mai 2011 Zum Druck genehmigt: 13. Mai 2011 gez. Prof. Dr. Lutz Kipp, Dekan 2 Für Janine 3 4 Abstract The thesis is about the solar radiative transfer into the ocean. Particular emphasis is placed on underwater light fluctuations due to focusing surface waves. The study includes measurements at high sea and computational simulations of the light propa-gation in seawater and wave-induced radiative variability. Surface waves of different sizes have an optical lensing effect; they cause focusing of light beams at various depths. The underwater propagation of light depends on the scattering and absorption properties of seawater. Strongest light fluctuations appear near the surface at water depths of 0.5 to 10 m. At 1 m depth, radiative enhancements with a factor of 40 compared to the mean light level can be achieved. These short-term extreme values refer to the downwelling irradiance.