What controls DOM/POM partitioning in rivers?

Peter J Hernes, University of California - Davis, Davis, United States, Rob Spencer, Florida State University, Earth, Ocean, and Atmospheric Science, Tallahassee, United States, Sandrine J Matiasek, California State University, Chico, Chico, United States and Rachael Y Dyda, University of California Davis, Davis, CA, United States