Using CDOM optical properties for estimating DOC concentrations and pCO2 in the Lower Amazon River - Valerio, Aline de Matos; Kampel, Milton; Vantrepotte, Vincent; Ward, Nicholas D; Sawakuchi, Henrique Oliveira; Less, Diani Fernanda Da Silva; Neu, Vania; Cunha, Alan; Richey, Jeffrey Edward (Optics Express, 2018)