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The distribution of dissolved aluminium in the West Atlantic Ocean shows amirror image with that of dissolved silicic acid, hinting at intricateinteractions between the ocean cycling of Al and Si. The marine biogeochemistryof Al is of interest because of its potential impact on diatom opalremineralisation, hence Si availability. Furthermore, the dissolved Alconcentration at the surface ocean has been used as a tracer for dust input,dust being the most important source of the bio-essential trace element iron tothe ocean. Previously, the dissolved concentration of Al was simulatedreasonably well with only a dust source, and scavenging by adsorption onsettling biogenic debris as the only removal process. Here we explore theimpacts of (i) a sediment source of Al in the Northern Hemisphere (especiallynorth of ~40{\deg}N), (ii) the imposed velocity field, and (iii) biologicalincorporation of Al on the modelled Al distribution in the ocean. The sedimentsource clearly improves the model results, and using a different velocity fieldshows the importance of advection on the simulated Al distribution. Biologicalincorporation appears to be a potentially important removal process. However,conclusive independent data to constrain the Al:Si incorporation ratio bygrowing diatoms are missing. Therefore, this study does not provide adefinitive answer to the question of the relative importance of Al removal byincorporation compared to removal by adsorptive scavenging.

On the effects of circulation, sediment resuspension and biological incorporation by diatoms in an ocean model of aluminium