On the Congo River (IMAGE) Rensselaer Polytechnic Institute Caption The chemical signature of fire-derived "black carbon" found in the oceans is significantly different from that found in rivers, which had long been presumed to be the source of oceanic black carbon. Credit Robert G.M. Spencer Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.