POSTER Session 1

Synergies of spaceborne imaging spectroscopy missions for applications in aquatic environments

Hyperspectral observations, combined with advanced retrieval algorithms, yield relevant information on aquatic ecosystems status, allowing, for instance, the phytoplankton community composition to be derived and improved monitoring of water quality parameters. To the aim, appropriate atmospheric correction (AC) is crucial to avoid uncertainties in the quantitative retrieval of biogeochemical variables and the analysis of their spatial and temporal variability. This study aims to assess the quality of standard reflectance products, along with some estimates derived by other AC processors (e.g., ACOLITE, POLYMER) obtained from the last generation of spaceborne imaging spectroscopy missions (e.g., PRISMA, DESIS, EnMAP, EMIT), in optically complex waters worldwide. An analytical comparison of the satellite-derived water reflectance was performed with 52 coincident in-situ reflectances provided by fixed autonomous radiometric systems (AERONET-OC, PANTHYR, HYPSTAR, WISPStation) and fieldworks. Overall, the results showed higher accuracy in the green bands with respect to the near infrared and blue bands, with higher uncertainties in clear waters than in turbid and productive waters. The retrieval of biogeophysical parameters through the inversion of a bio-optical model and semi-empirical adaptive algorithms was then performed considering the uncertainty of reflectance, with consequent validation with in-situ data. The study concludes by highlighting the importance of validation activities to trace the uncertainty of reflectance products to be used as input for water quality parameter retrieval algorithms. Furthermore, the use of future comparable operational hyperspectral missions (e.g., Copernicus CHIME, SBG) is highlighted to capitalize the work that so far is demonstrated with these pre-operational missions.

*Andrea Pellegrino, Sapienza University of Rome, Italy

Mariano Bresciani, Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell’Ambiente (CNR IREA), Italy

Alice Fabbretto, Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell’Ambiente (CNR IREA), Italy

Lodovica Panizza, Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell’Ambiente (CNR IREA), Italy

Monica Pinardi, Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell’Ambiente (CNR IREA), Italy

Salvatore Mangano, Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell’Ambiente (CNR IREA), Italy

Nicola Ghirardi, Consiglio Nazionale delle Ricerche, Institute of BioEconomy (CNR IBE), Italy

Federica Braga, Consiglio Nazionale delle Ricerche, Istituto di Scienze Marine (CNR ISMAR), Italy

Vittorio Ernesto Brando, Consiglio Nazionale delle Ricerche, Istituto di Scienze Marine (CNR ISMAR), Italy

Claudia Giardino, Consiglio Nazionale delle Ricerche, Istituto per il Rilevamento Elettromagnetico dell’Ambiente (CNR IREA), Italy

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