Published August 02, 2018
As part of the commitment to support climate change policy, the CHE project is addressing the challenges of developing a CO2 emissions monitoring support capacity. Among these challenges is the assessment of the requirements for future space missions dedicated to the monitoring of CO2. This assessment needs to be done in the framework of Observing System Simulation Experiments (OSSEs) which are based on a reference simulation or nature run used as the truth, from which synthetic observations can be produced. As the nature run is taken to be the truth, the simulation is required to represent a realistic variability of the observed parameters. In this context, the CHE project aims to provide a library of simulations at different scales from global to regional to local which can be used as nature runs to sample the atmospheric variability associated with regional and local sources/sinks to point sources of CO2 at the surface. The CHE deliverable D2.1 describes the configuration of the different nature runs and their domains and resolutions. The nature run presented here is the CHE Tier1 global nature run, which is the first step towards building this library of simulations.