Summer 2016 field intercomparison of ambient NH3

An integral part of the MetNH3 project is establishing the transfer of high-accuracy standards to field applicable methods. A field intercomparison of NH3 measurement techniques is planned for summer 2016 at a managed grassland in south-east Scotland. The aim of this experiment is to evaluate both the reference methods developed during the MetNH3 project and other state-of-the-art and older instrumentation currently available for field measurements. The challenge is to measure quantitatively both at background concentrations and elevated produced through fertilisation with urea. In addition to the instrument performance, the effect of meteorology (temperature, relative humidity, precipitation), inlet type and calibration method on the quality of data will be investigated. This presentation will outline the specific objectives of the study, as well as the provisional field setup. The talk will inform and lead to an open discussion on planning the experiment and the analysis of the data for all project partners and intercomparison participants.