POSTER Session 3

CHASING INTERNAL WAVES WITH OCEAN COLOR METHODS

Internal waves are oceanographic phenomena that differ from surface ocean waves in that they occur in the subsurface, at the intersection between two water masses of different densities. One of the reasons for studying internal waves is their role in enhancing ocean biology and productivity. Although internal waves are well-known, there is no systematic way to study them on a global scale and limited work has been done using ocean color satellite imagery. The size and spacing of internal waves can vary between several hundred meters to kilometers, therefore, not all ocean color satellites are suitable to study these phenomena. Moreover, the prediction of internal wave events to collect in situ data is not always possible. The island of Lastovo (Croatia) presents bathymetric features, summer stratification and wind patterns that lead to the development of internal island-trapped waves every year. These describe a clockwise motion around the island that occurs intermittently and that can be predicted in advance. Here we show: 1) promising results of machine learning algorithm designed to detect internal waves in SeaHawk CubeSat (130 m resolution) and Sentinel-3 (300 m resolution) imagery, and 2) preliminary analysis of in situ optical data collected in Lastovo in 2023 to study the effect of internal waves in the light field and net community production of a highly oligotrophic Mediterranean region. Data collected included remote sensing reflectance, upwelling and downwelling radiance and irradiance, and ratios of dissolved oxygen to dinitrogen during, before, and after internal wave events in July 2023.

Sara Rivero-Calle, University of Georgia Skidaway Institute of Oceanography, USA, [email protected], https://orcid.org/0000-0002-7538-0429

Francisco Dias Silva, University of Aveiro, Portugal, [email protected]

Md Masud-Ul-Alam, University of Georgia Skidaway Institute of Oceanography, USA, [email protected]

Benjamin Lowin, University of Georgia Skidaway Institute of Oceanography, USA, [email protected]

Zrinka Ljubešić, University of Zagreb, Croatia, [email protected]

Antonija Matek, University of Zagreb, Croatia, [email protected]

Hrvoje Mihanović, Institute of Oceanography and Fisheries, Croatia, [email protected]

Hrvoje Čižmek, Marine Explorers Society 20.000 leagues, Croatia, [email protected]

Barbara Čolić, Marine Explorers Society 20.000 leagues, Croatia, [email protected]

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