Porting OptClim Optimisation system to ARCHER2

We have made two software systems available on ARCHER2 to enhance the ways in which researchers can respond to uncertainty in models. We have ported the OptClim2 software to permit researchers to optimise parameters in three Earth system models: CESM, MITgcm-based models and UKESM. We have developed “particle filtering” (PF) software for UKESM to allow an ensemble of runs to track historical data. The OptClim2 and PF systems are currently being trialled with UKESM; OptClim2 is also available for first research use with MITgcm or CESM. The development for UKESM was complicated by the need to communicate from ARCHER2 to the NCAS-provided server that runs UKESM workflow. To achieve this we used GeosMeta, which is an Edinburgh developed service providing a RESTful interface to a Mongo Database.This work was funded under the embedded CSE programme of the ARCHER2 UK National Supercomputing Service (http://www.archer2.ac.uk)