Oceanographic Features Detected on MODIS Images Under Sunglint Condition: Examples at the Brazilian Southeastern Coast

Abstract Optical/near-infrared remote sensing images acquired by remote sensors in specular bidirectional reflection conditions between sun, sea surface and sensor (sunglint condition) can be used to identify oceanographic and meteorological features and processes at work on the surface of the sea at the time of image acquisition. Moderate Resolution Imaging Spectroradiometer (MODIS) images in sunglint conditions over the Brazilian Southeastern continental shelf were digitally processed and analyzed allowing identify features as the Brazil Current front, mesoscale eddies and meanders, internal solitary waves, atmospheric rolls, biogenic and mineral surface slicks. Base on the understanding about these ocean and atmospheric process and the mechanism which allow us to distinguish these features in sunglint contaminated images. As highlighted here, it is possible to do a better and more detailed interpretation of complex features visible in such images, information that can be applied in operational oceanography, as well as to obtain a better understanding of marine environment processes. The atmospheric correction more suitable to sunglint conditions are here descripted too. As well, the sunglint condition dependence of favorable solar zenith angles which partially restrict its geometry of acquisition (sun, sensor and sea surface) between October and February at the Brazilian Southeastern coast.