Paul Alexander Levine¹, James Tremper Randerson², Qing Zhu³, William J Riley⁴, Alison Hoyt⁵, Susan Trumbore⁶, Zheng Shi⁷ and Forrest M. Hoffman², (1)University of California Irvine, Earth System Science, Irvine, CA, United States, (2)University of California Irvine, Department of Earth System Science, Irvine, CA, United States, (3)Purdue University, West Lafayette, IN, United States, (4)Lawrence Berkeley National Laboratory, Berkeley, CA, United States, (5)Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, Cambridge, CA, United States, (6)Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, Germany, (7)University of California Irvine, Ecology & Evolutionary Biology, Irvine, CA, United States