Abstract:
:The primary productivity of the Southern Ocean ecosystem is limited by iron availability. Away from benthic and aeolian sources, iron reaches phytoplankton primarily when iron-rich subsurface waters enter the euphotic zone. Here, eddy-resolving physical/biogeochemical simulations of a seasonally-forced, open-Southern-Ocean ecosystem reveal that mesoscale and submesoscale isopycnal stirring effects a cross-mixed-layer-base transport of iron that sustains primary productivity. The eddy-driven iron supply and consequently productivity increase with model resolution. We show the eddy flux can be represented by specific well-tuned eddy parametrizations. Since eddy mixing rates are sensitive to wind forcing and large-scale hydrographic changes, these findings suggest a new mechanism for modulating the Southern Ocean biological pump on climate timescales.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Uchida T,Balwada D,P Abernathey R,A McKinley G,K Smith S,Lévy Mdoi
10.1038/s41467-020-14955-0subject
Has Abstractpub_date
2020-02-28 00:00:00pages
1125issue
1issn
2041-1723pii
10.1038/s41467-020-14955-0journal_volume
11pub_type
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