Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the effects of circulation, sediment resuspension and biological
  incorporation by diatoms in an ocean model of aluminium   The distribution of dissolved aluminium in the West Atlantic Ocean shows a
mirror image with that of dissolved silicic acid, hinting at intricate
interactions between the ocean cycling of Al and Si. The marine biogeochemistry
of Al is of interest because of its potential impact on diatom opal
remineralisation, hence Si availability. Furthermore, the dissolved Al
concentration 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 to
the ocean. Previously, the dissolved concentration of Al was simulated
reasonably well with only a dust source, and scavenging by adsorption on
settling biogenic debris as the only removal process. Here we explore the
impacts of (i) a sediment source of Al in the Northern Hemisphere (especially
north of ~40{\deg}N), (ii) the imposed velocity field, and (iii) biological
incorporation of Al on the modelled Al distribution in the ocean. The sediment
source clearly improves the model results, and using a different velocity field
shows the importance of advection on the simulated Al distribution. Biological
incorporation appears to be a potentially important removal process. However,
conclusive independent data to constrain the Al:Si incorporation ratio by
growing diatoms are missing. Therefore, this study does not provide a
definitive answer to the question of the relative importance of Al removal by
incorporation compared to removal by adsorptive scavenging.

22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th