Global ocean biogeochemistry model HAMOCC: Model architecture and performance as component of the MPI‐Earth system model in different CMIP5 experimental realizations

摘要: [1] Ocean biogeochemistry is a novel standard component of fifth phase the Coupled Model Intercomparison Project (CMIP5) experiments which project future climate change caused by anthropogenic emissions greenhouse gases. Of particular interest here evolution oceanic sink carbon and contribution to climate-carbon cycle feedback loop. The Hamburg ocean model (HAMOCC), Max Planck Institute for Meteorology Earth system (MPI-ESM), employed address these challenges. In this paper we describe version HAMOCC used in CMIP5 (HAMOCC 5.2) its implementation MPI-ESM provide documentation basis CMIP5-related studies. Modeled present day distributions biogeochemical variables calculated two different horizontal resolutions compare fairly well with observations. Statistical metrics indicate that performs better at surface worse interior. There tendency improvements higher resolution configuration representing deeper variables; however, there little no improvement surface. An experiment interactive driven CO2 produces 25% variability uptake over historical period than same forced prescribed atmospheric concentrations. Furthermore, warming 3.5 K projected concentration four times preindustrial value, reduced atmosphere-ocean flux 1 GtC yr−1. Overall, shows consistent results configurations, being suitable type simulations required within experimental design.