<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Investigating Air-Water Gas Transfer via Fluorescence Imaging"^^ . "This study presents an advanced Fluorescence Imaging technique to make air-water gas exchange dynamics in a wind-wave facility visible up to high wind speeds. Fluorescence is generated by the pH-sensitive dye pyranine, which transitions into its fluorescent alkaline form upon reacting with the invading alkaline trace gas methylamine. A high-intensity laser illumination system combined with a multi-camera setup is implemented at the Heidelberg Aeolotron, enabling high-resolution imaging of fluorescent patterns in gas concentration fields near the water surface. Near-surface turbulent structures such as quasi-streamwise vortices, Langmuir circulations, and microscale wave breaking are identified. A major achievement is the development of a simulation-based method for estimating water-side gas transfer velocities. By modeling one-dimensional mass transport using the Small Eddy Model and comparing simulated fluorescence time series to experimental data, a robust determination of turbulence profiles and gas transfer velocities with uncertainties between 5% and 20% is established. Additionally, an algorithm is developed to detect and track microscalewave breaking events, combining structure tensor-based Oriented FAST and Rotated BRIEF detection, cluster analysis, and optical flow techniques. Based on the detected microscale wave breaking statistics, a first quantitative estimate suggests that microscale wave breaking contributes approximately 35% to 80% of the total water-side gas transfer velocity within a friction velocity range of 0.3 cm/s to 0.8 cm/s."^^ . "2025" . . . . . . . "Dennis"^^ . "Hofmann"^^ . "Dennis Hofmann"^^ . . . . . . "Investigating Air-Water Gas Transfer via Fluorescence Imaging (PDF)"^^ . . . "Dissertation_Dennis_Hofmann.pdf"^^ . . . "Investigating Air-Water Gas Transfer via Fluorescence Imaging (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Investigating Air-Water Gas Transfer via Fluorescence Imaging (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Investigating Air-Water Gas Transfer via Fluorescence Imaging (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Investigating Air-Water Gas Transfer via Fluorescence Imaging (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Investigating Air-Water Gas Transfer via Fluorescence Imaging (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #36916 \n\nInvestigating Air-Water Gas Transfer via Fluorescence Imaging\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .