The continental margin is a key source of iron to the HNLC North Pacific Ocean
MetadataShow full item record
Here we show that labile particulate iron and manganese concentrations in the upper 500 m 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.
Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 35 (2008): L07608, doi:10.1029/2008GL033294.
Suggested CitationGeophysical Research Letters 35 (2008): L07608
Showing items related by title, author, creator and subject.
Data file : sediments of the East Atlantic continental margin, northwest Africa : sample collection and analysis Briggs, Scott R.; Summerhayes, Colin P.; Milliman, John D. (Woods Hole Oceanographic Institution, 1976-06)The petrology, provenance, and history of sediments from the continental shelf and upper continental slope of western Africa have been studied in some detail by scientists from the Woods Hole Oceanographic Institution ...
Lam, Phoebe J.; Bishop, James K. B.; Henning, Cara C.; Marcus, Matthew A.; Waychunas, Glenn A.; Fung, Inez Y. (American Geophysical Union, 2006-02-01)Heightened biological activity was observed in February 1996 in the high-nutrient low-chlorophyll (HNLC) subarctic North Pacific Ocean, a region that is thought to be iron-limited. Here we provide evidence supporting the ...
The role of magmatism in the thinning and breakup of the South China Sea continental margin: Special Topic: the South China Sea Ocean Drilling Sun, Zhen; Lin, Jian; Qiu, Ning; Jian, Zhimin; Wang, PinXian; Pang, Xiong; Zheng, Jinyun; Zhu, Benduo (Oxford University Press, 2019-08-13)Magmatism plays a key role in the process of continental margin breakup and ocean formation. Even in the extremely magma-poor Iberia and Newfoundland margin, studies of field outcrops have shown that syn-rift magmatism had ...