Abstract
Abstract. We present a new near-global coupled biogeochemical ocean-circulation model configuration. The configuration features a horizontal discretization with a grid spacing of less than 11 km in the Southern Ocean and gradually coarsens in meridional direction to more than 200 km at 64∘ N, where the model is bounded by a solid wall. The underlying code framework is the Geophysical Fluid Dynamics Laboratory (GFDL)'s Modular Ocean Model coupled to the Biogeochemistry with Light, Iron, Nutrients and Gases (BLING) ecosystem model of Galbraith et al. (2010). The configuration is unique in that it features both a relatively equilibrated oceanic carbon inventory and an eddying ocean circulation based on a realistic model geometry/bathymetry – a combination that has been precluded by prohibitive computational cost in the past. Results from a simulation with climatological forcing and a sensitivity experiment with increasing winds suggest that the configuration is sufficiently equilibrated to explore Southern Ocean carbon uptake dynamics on decadal timescales. The configuration is dubbed MOMSO, a Modular Ocean Model Southern Ocean configuration.
Highlights
The Southern Ocean, known as the Antarctic Ocean, comprises the southernmost waters of the world oceans
Binning the observational data of several years or even decades into one product closes spatial data gaps, but this blurs the referencing to an ever-changing system state. This problem is especially pronounced in the Southern Ocean where in situ data acquisition is complicated by hostile environmental conditions
We find that the bias in surface PO4 concentrations is almost constant over the course of a seasonal cycle (Fig. 24d), even though the photosynthetically available radiation varies dramatically from season to season in the respective latitudes
Summary
The Southern Ocean, known as the Antarctic Ocean, comprises the southernmost waters of the world oceans. The algorithmic entity comprises both the underlying partial differential equations and their approximated representation within the numerical solver.) we will showcase that the “level of equilibration” of simulated dissolved inorganic carbon allows us to test the sensitivity of the Southern Ocean carbon budget to anticipated climate change patterns This model description paper aims to (1) describe a new eddying coupled ocean-circulation biogeochemical model configuration of the Southern Ocean and (2) outline research questions for which MOMSO may serve as the base of a tool bench. The ocean-circulation model is coupled to a sea ice model and the Biogeochemistry with Light, Iron, Nutrients and Gases (BLING) model from Galbraith et al (2010)
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