POSTER Session 2

BIO-OPTICAL CHARACTERIZATION OF SURFACE WATERS UNDERWAY THE INDIAN OCEAN – FROM SINGAPORE TO MAURITIUS

Hyperspectral bio-optical measuring methods are essential elements of modern ocean observation and support both basic and applied research (e.g. satellite observations or bio-optical modeling) with high-resolution data sets. Light provides a basic requirement for life as it fuels photosynthesis and thus primary aquatic production. An accurate understanding is crucial, also including the surface properties as an important basis. As light attenuation is dependent on the optically active substances in the water (phytoplankton, CDOM, NAP), bio-optical observations can also provide information about these parameters. On the research cruise SO299/2 with R/V Sonne from Singapore to Mauritius (August 15th – September 2nd, 2023) the transit in international waters was characterized by several ship-based underway measurements obtaining a high-resolution data set. A hyperspectral radiometric set-up in front of the ship was used to derive important apparent optical properties (e.g., the diffuse attenuation coefficient, remote sensing reflectance, ocean color). In addition, a FerryBox System (4H Jena, Germany) measured continuously biogeochemical parameters in the surface water (e.g., salinity, temperature, oxygen, turbidity, and chl-a). Further, discrete samples were taken in defined intervals and analyzed on board to provide absorption and fluorescence characteristics. Additionally, collected data are combined with the FAIR processed data of the German “Underway Research Data” project of the German Marine Research Alliance (DAM). The bio-optical characterization of the transect can be used to match with satellite remote sensing in this area for validation purposes, increasing data availability and can contribute to an understanding of the dynamics and processes in the Indian Ocean.

Daniela Voss, Institute for Chemistry and Biology of the Marine Environment, Germany, https://orcid.org/0000-0002-1580-5456

Jochen Wollschlaeger, Institute for Chemistry and Biology of the Marine Environment, Germany

Julia Oelker, Institute for Chemistry and Biology of the Marine Environment, Germany

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