Continental-shelf sediment as a primary source of iron for coastal phytoplankton

Article Abstract:

Measurements of dissolvable iron, nitrate and chlorophyll in the California Current System indicate that there were high concentrations of iron during strong upwelling conditions in Mar 1997. There was a low concentration of dissolvable iron in surface waters during the 1998 El Nino. The iron source in the upwelled water does not seem to originate from diffusion of dissolved iron from shelf sediments. Iron may be deficient at ocean margins where upwelling does not take place, even if there is a substantial riverine input.

Health aspects, Soils, Soil chemistry, Sediment, Suspended, Suspended sediment

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Control of community growth and export production by upwelled iron in the equatorial Pacific Ocean

Article Abstract:

Upwelling waters in the equatorial regions are the main source of iron for biological production in the Pacific Ocean. The increase in sub-nanomolar iron concentration increases the amount of carbon which moves to the deeper waters of the ocean. The rise in iron concentration increases phytoplanktonic growth and biomass. The oceanic biological productivity and carbon export to deeper waters depends on the changes in the water's iron content and the rate of upwelling.

Analysis, Observations, Biological productivity, Upwelling (Oceanography)

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A massive phytoplankton bloom induced by an ecosystem-scale iron fertilization experiment in the equatorial Pacific Ocean

Article Abstract:

An iron-enrichment experiment in the equatorial Pacific Ocean sparked an enormous phytoplankton bloom which consumed large amounts of carbon dioxide and nitrate that they cannot fully utilize under normal conditions. This affirms the hypothesis that iron bioavailability restricts phytoplankton growth and biomass in high-nitrate, low-chlorophyll waters, such as the Southern Ocean and the Pacific.

Cover Story, Growth, Bioavailability

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