We will deploy a high sensitivity, high resolution mass spectrometer (PTR-QiTOF) to measure concentrations and fluxes of a wide array of VOCs at the PROPHET tower as part of a broader field campaign planned for summer 2016. The measurements will allow us to measure the concentrations, emissions and deposition of the full suite of atmospheric organics detectable by proton-transfer, simultaneously across the full mass range. Results will contribute to a better understanding of reactive carbon exchange between the land and atmosphere. Our measurements will also be a valuable resource for other investigators in this PROPHET campaign aiming to investigate radical cycling, reactive nitrogen, carbon budgets, and other priority issues for the overall study.