What question did this study set out to answer?

To synthesize and compare findings from eight open-ocean iron fertilization experiments to assess the environmental controls on primary production, diatom community shifts, and carbon sequestration efficiency.

September 1, 2005Journal of Geophysical Research AtmospheresOpen Access

Synthesis of iron fertilization experiments: From the Iron Age in the Age of Enlightenment

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Authors

HBH. J. W. de BaarEcosystem Sciences PBPhilip W. BoydUniversity of East Anglia KCKenneth H. CoaleMoss Landing Marine Laboratories

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Implication

Synthesis of eight ocean field experiments reveals that iron fertilization efficiency scales inversely with mixed layer depth, indicating physical light limitations regulate carbon drawdown.

Key Points

To synthesize and compare findings from eight open-ocean iron fertilization experiments to assess the environmental controls on primary production, diatom community shifts, and carbon sequestration efficiency.
Synthesized data across eight in situ iron fertilization experiments (including Southern Ocean campaigns, SEEDS, SERIES, IronEx-2, and EisenEx) and complementary EisenEx bottle incubations.
Evaluated variables including wind mixed layer depth, sea surface irradiance, water temperature, patch dilution, grazing pressure, and iron speciation dynamics.
Maximum chlorophyll a, dissolved inorganic carbon (DIC) removal, and DIC/Fe uptake efficiency scaled inversely with wind mixed layer depth, yielding an overall DIC/Fe uptake efficiency of ~5600 across all eight experiments.
Large diatoms universally dominated the floristic response to iron addition—led primarily by Pseudo-nitzschia spp.—with the minimum dissolved iron concentration dictating the dominant size class while ~75% of dissolved iron converted to colloidal forms.
Particulate organic carbon accounted for roughly one quarter of overall primary production with the remaining three quarters lost to food web grazing, while verified deep-water carbon export was modest and confirmed in only two experiments.

Cite This Study

Baar et al. (2005) studied this question.

synapsesocial.com/papers/6a6faa826ceb2bbd16dfb4c4 https://doi.org/10.1029/2004jc002601

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Implication

Synthesis of eight ocean field experiments reveals that iron fertilization efficiency scales inversely with mixed layer depth, indicating physical light limitations regulate carbon drawdown.

Synthesis of iron fertilization experiments: From the Iron Age in the Age of Enlightenment

Discussion

Member takes

Implication

Key Points

Cite This Study

Synthesis of iron fertilization experiments: From the Iron Age in the Age of Enlightenment

Discussion

Member takes

Implication

Key Points

Cite This Study

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