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      Mapping phytoplankton iron utilization: Insights into Southern Ocean supply mechanisms : SOUTHERN OCEAN FE UTILIZATION AND SUPPLY

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      Journal of Geophysical Research: Oceans

      American Geophysical Union (AGU)

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          Global iron connections between desert dust, ocean biogeochemistry, and climate.

          The environmental conditions of Earth, including the climate, are determined by physical, chemical, biological, and human interactions that transform and transport materials and energy. This is the "Earth system": a highly complex entity characterized by multiple nonlinear responses and thresholds, with linkages between disparate components. One important part of this system is the iron cycle, in which iron-containing soil dust is transported from land through the atmosphere to the oceans, affecting ocean biogeochemistry and hence having feedback effects on climate and dust production. Here we review the key components of this cycle, identifying critical uncertainties and priorities for future research.
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            Photosynthetic rates derived from satellite-based chlorophyll concentration

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              Mesoscale iron enrichment experiments 1993-2005: synthesis and future directions.

              Since the mid-1980s, our understanding of nutrient limitation of oceanic primary production has radically changed. Mesoscale iron addition experiments (FeAXs) have unequivocally shown that iron supply limits production in one-third of the world ocean, where surface macronutrient concentrations are perennially high. The findings of these 12 FeAXs also reveal that iron supply exerts controls on the dynamics of plankton blooms, which in turn affect the biogeochemical cycles of carbon, nitrogen, silicon, and sulfur and ultimately influence the Earth climate system. However, extrapolation of the key results of FeAXs to regional and seasonal scales in some cases is limited because of differing modes of iron supply in FeAXs and in the modern and paleo-oceans. New research directions include quantification of the coupling of oceanic iron and carbon biogeochemistry.
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                Author and article information

                Journal
                Journal of Geophysical Research: Oceans
                J. Geophys. Res.
                American Geophysical Union (AGU)
                01480227
                June 2012
                June 12 2012
                : 117
                : C6
                : n/a
                10.1029/2011JC007726
                © 2012

                http://doi.wiley.com/10.1002/tdm_license_1.1

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