POSTER Session 3

SIMULATION AND ANALYSIS OF ADJACENCY EFFECTS IN INLAND WATERS: A CASE STUDY

Radiometric contributions from nearby land (the so-called adjacency effects) constitute a source of perturbations in satellite data products from coastal and inland waters. Previous extensive studies on adjacency effects in coastal regions (Bulgarelli et al. 2014, 2018) have been now extended to inland waters. This work presents results from the theoretical analysis of adjacency effects (AE) in typical multi-sensors observations from an inland water basin located in the North of Italy: the Lake Maggiore. Adjacency effects were simulated with the newly parallelized NAUSICAA 3D Monte Carlo code (Bulgarelli et al., 2014). Simulations were performed at representative center-wavelengths (i.e., 443, 667 and 865 nm); mean climatological atmospheric conditions were extracted from the Ispra AERONET site (Ångström exponent α=1.49 ± 0.08, aerosol optical thickness at 500 nm τa(500)= 0.245 ± 0.075), while the water radiometric features were obtained from in-situ measurements. Specifically, a campaign was performed between April and June 2022 showing average remote sensing values Rrs(443) = 0.0021 ± 0.0002 and Rrs(665)= 0.0005± 0.0001.The percent adjacency effects were compared with typical sensor noise levels to enquire the need to correct for adjacency effects to deliver accurate data from inland waters. By assuming a homogeneous and isotropic vegetation land albedo, adjacency effects were shown to well exceed OLCI, MSI and OLI noise levels even at the center of the lake.

Barbara Bulgarelli, Joint Research Centre – European Commission, [email protected], https://orcid.org/0000-0002-9668-2469

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