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 CitationArticle: Lam, Phoebe J., Bishop, James K. B., "The continental margin is a key source of iron to the HNLC North Pacific Ocean", Geophysical Research Letters 35 (2008): L07608, DOI:10.1029/2008GL033294, https://hdl.handle.net/1912/3359
Showing items related by title, author, creator and subject.
Modeling sulfate reduction in methane hydrate-bearing continental margin sediments : does a sulfate-methane transition require anaerobic oxidation of methane? Malinverno, Alberto; Pohlman, John W. (American Geophysical Union, 2011-07-12)The sulfate-methane transition (SMT), a biogeochemical zone where sulfate and methane are metabolized, is commonly observed at shallow depths (1–30 mbsf) in methane-bearing marine sediments. Two processes consume sulfate ...
Geomorphology and Neogene tectonic evolution of the Palomares continental margin (Western Mediterranean) Gomez de la Peña, Laura; Gracia, Eulalia; Munoz, Araceli; Acosta, Juan; Gomez-Ballesteros, María; Ranero, Cesar R.; Uchupi, Elazar (2016-03)The Palomares continental margin is located in the southeastern part of Spain. The margin main structure was formed during Miocene times, and it is currently part of the wide deformation zone characterizing the region ...
A radiocarbon-based assessment of the preservation characteristics of crenarchaeol and alkenones from continental margin sediments Mollenhauer, Gesine; Eglinton, Timothy I.; Hopmans, Ellen C.; Sinninghe Damste, Jaap S. (2008-01-22)Crenarchaeotal glycerol dibiphytanyl glycerol tetraether (GDGT) lipids and alkenones are two types of biomarkers derived from planktonic marine micro-organisms which are used for reconstruction of sea-surface temperatures. ...