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  Iron supply and demand in the upper ocean

Fung, I. Y., Meyn, S. K., Tegen, I., Doney, S. C., John, J. G., & Bishop, J. K. B. (2000). Iron supply and demand in the upper ocean. Global Biogeochemical Cycles, 14(1), 281-295. doi:10.1029/2000GB001295.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-000E-E1E1-8 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0024-6AFE-A
Genre: Journal Article

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BGC0221e.pdf (Supplementary material), 3MB
 
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http://dx.doi.org/10.1029/2000GB001295 (Publisher version)
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 Creators:
Fung, I. Y., Author
Meyn, S. K., Author
Tegen, I.1, Author           
Doney, S. C., Author
John, J. G., Author
Bishop, J. K. B., Author
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1External Organizations, ou_persistent22              

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 Abstract: Iron is hypothesized to be a limiting micronutrient for ocean primary production. This paper presents an analysis of the iron budget in the upper ocean. The global distribution of annual iron assimilation by phytoplankton was estimated from distributions of satellite-derived oceanic primary production and measured (Fe:C)cellular ratios. The distributions of iron supply by upwelling/mixing and aeolian deposition were obtained by applying (Fe:NO3)dissolved ratios to the nitrate supply and by assuming the soluble fraction of mineral aerosols. A lower bound on the rate of iron recycling in the photic zone was estimated as the difference between iron assimilation and supply. Global iron assimilation by phytoplankton for the open ocean was estimated to be 12 × 109 mol Fe yr−1. Atmospheric deposition of total Fe is estimated to be 96×109 mol Fe yr−1 in the open ocean, with the soluble Fe fraction ranging between 1 and 10% (or 1-10 ×109 mol Fe yr−1). By comparison, the upwelling/entrainment supply of dissolved Fe to the upper ocean is small, ∼0.7×109 mol Fe yr−1. Uncertainties in the aeolian flux and assimilation may be as large as a factor of 5-10 but remain difficult to quantify, as information is limited about the form and transformation of iron from the soil to phytoplankton incorporation. An iron stress index, relating the (Fe:N) demand to the (Fe :N) supply, confirms the production in the high-nitrate low-chlorophyll regions is indeed limited by iron availability.

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 Dates: 2000
 Publication Status: Issued
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 Identifiers: Other: BGC0221
DOI: 10.1029/2000GB001295
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Title: Global Biogeochemical Cycles
Source Genre: Journal
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Publ. Info: Washington, DC : American Geophysical Union
Pages: - Volume / Issue: 14 (1) Sequence Number: - Start / End Page: 281 - 295 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925553383
ISSN: 0886-6236