Comparação de produtos MODIS-Aqua de cor do oceano com dados in situ em águas costeiras de Ubatuba (SP), plataforma continental sudeste brasileira

Ocean colour remote sensing is an important tool for environmental monitoring, especially involving climate change and anthropogenic impacts. Besides the chlorophyll a concentration (Chla) and the remote sensing reflectance (Rrs) of the oceans surface layers, new products, such as, the diffuse attenuation coefficient ((Kd(490)), Coloured Dissolved Organic Matter (CDOM) index, and particulate organic matter concentration (POC), have multiplied remote sensing applications for oceanographic researches. However, the estimation of these parameters in coastal zones, with optically complex waters, is still a great challenge. In this context, the present work aimed to evaluate the performance of MODIS-Aqua ocean colour products in coastal waters of Ubatuba (SP/Brazil), with in situ validation at the ANTARES-Ubatuba station. The station is characterized by a mixture of Case 1 and 2 waters. The Rrs (412, 443, 490, 510 e 555 nm) showed higher errors associated to the 412 and 443 nm bands, which have greatest challenges in the atmospheric correction. Anyway, the Chla and Kd(490) showed very good association with in situ data (R 2 = 0.81 and 0.82, respectively). The CDOM index did not work, because the dependency relationship between CDOM and Chla, used in the index model, wasnt encountered in the study area. Other models that derive the constituents separately (e.g. semi-analytical) should be tested for the CDOM retrieval. The POC, on the other hand, showed a reasonable performance (R2 = 0.44), with good potential of application for the Ubatuba coastal waters.Pages: 7168-717