This directory contains source code, scripts, model and optimization output related to Kriest, I. (2017), Calibration of a simple and a complex model of global marine biogeochemistry, Biogeosciences Discuss, doi:10.5194/bg-2017-71, and the revised, follow up paper in Biogeosciences. For the optimization algorithm, scripts related to optimization, and more in-depth explanation see supplement to Kriest et al., (2017), Calibrating a global three-dimensional biogeochemical ocean model (MOPS-1.0), Geosci. Model Dev., 10, 127–154, 2017 www.geosci-model-dev.net/10/127/2017/ doi:10.5194/gmd-10-127-2017 For the most up-to-date version, in particular of the TMM, see https://github.com/samarkhatiwala/tmm. Here, I supply the following: (0) Directory "Code": Source Code (TMM and MOPS/RetroMOPS). (1) Directory "ModelOutput": Model output (annual average concentrations and fluxes). (2) Directory "OptimizationOutput": Optimization output (fitness and parameter values of the optimization trajectory). See READMEs in these directories. Iris Kriest, 2017-10-16