The continental margin is a key source of iron to the HNLC

Revisions submitted to GRL on 02/15/08 Here we show that labile particulate iron and manganese concentrations in the upper 500m of the Western Subarctic Pacific, an iron-limited High Nutrient Low Chlorophyll (HNLC) region, have prominent subsurface maxima between 100-200 m, reaching 3 nM and 600 pM,...

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Bibliographic Details
Main Authors: Phoebe J. Lam, James K. B. Bishop, Woods Hole Ma
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2008
Subjects:
4808
Chemical tracers
1050
Marine geochemistry
4800 Oceanography
biological and
Pacific
Kamchatka
Subarctic
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.525.4501
http://xraysweb.lbl.gov/uxas/Publicatons/Papers/pdfs/2008GL033294-pip.pdf
Description
Summary:Revisions submitted to GRL on 02/15/08 Here we show that labile particulate iron and manganese concentrations in the upper 500m of the Western Subarctic Pacific, an iron-limited High Nutrient Low Chlorophyll (HNLC) region, have prominent subsurface maxima between 100-200 m, reaching 3 nM and 600 pM, respectively. The subsurface concentration maxima in particulate Fe are characterized by a more reduced oxidation state, suggesting a source from primary volcagenic minerals such as from the Kuril/Kamchatka margin. The systematics of these profiles suggest a consistently strong lateral advection of labile Mn and Fe from redox-mobilized labile sources at the continental shelf supplemented by a more variable source of Fe from the upper continental slope. This subsurface supply of iron from the continental margin is shallow enough to be accessible to the surface through winter upwelling and vertical mixing, and is likely a key source of bioavailable Fe to the HNLC North Pacific.

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