Abstract：
:The availability of iron (Fe) can seasonally limit phytoplankton growth in the High Latitude North Atlantic (HLNA), greatly reducing the efficiency of the biological carbon pump. However, the spatial extent of seasonal iron limitation is not yet known. We present autumn nutrient and dissolved Fe measurements, combined with microphytoplankton distribution, of waters overlying the Hebridean (Scottish) shelf break. A distinct biogeochemical divide was observed, with Fe deficient surface waters present beyond the shelf break, much further eastwards than previously recognised. Due to along and on-shelf circulation, the Hebridean shelf represents a much-localised source of Fe, which does not fertilise the wider HLNA. Shelf sediments are generally thought to supply large quantities of Fe to overlying waters. However, for this Fe to influence upper-ocean biogeochemical cycling, efficient off-shelf transport mechanisms are required. This work challenges the view that the oceanic surface waters in close proximity to continental margins are iron replete with respect to marine primary production demands.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Birchill AJ,Hartner NT,Kunde K,Siemering B,Daniels C,González-Santana D,Milne A,Ussher SJ,Worsfold PJ,Leopold K,Painter SC,Lohan MCdoi
10.1038/s41598-018-37436-3subject
Has Abstractpub_date
2019-02-05 00:00:00pages
1435issue
1issn
2045-2322pii
10.1038/s41598-018-37436-3journal_volume
9pub_type
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