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https://doi.org/10.5194/bg-2020-283
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-283
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  11 Sep 2020

11 Sep 2020

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This preprint has been withdrawn by the authors.

Extraterrestrial dust as a source of bioavailable Fe for the ocean productivity

Rudraswami N. Gowda1, Mayank Pandey1, Matthew J. Genge2, and Dafilgo Fernandes1 Rudraswami N. Gowda et al.
  • 1CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India
  • 2Department of Earth Science and Engineering, Imperial College London, SW7 2AZ, UK

Abstract. Bioavailable Fe is an essential nutrient for phytoplankton that allows organisms to flourish and drawdown atmospheric CO2 affecting global climatic condition. In marine locales remote from the continents extraterrestrial-dust provides an important source of Fe and thus moderates primary productivity. Here we provide constraints on partitioning of extraterrestrial Fe between seawater and sediments from observations of dissolution and alteration cosmic spherules recovered from the deepsea sediments and Antarctica. Of the ~ 3000–6000 t/a extraterrestrial dust that reaches Earth surface, ~ 2–5 % material survives in marine sediments whilst the remainder is liberated into seawater. Both processes contributes ~ (3–10) × 10−8 molFe m−2 yr−1. Also, Fe contribution due to evaporation of survived particle is estimated to be ~ 10 % of Fe contribution to meteoric smoke. Changes in extraterrestrial-dust flux vary not only the amount of Fe by up to three orders of magnitude, but also the partitioning of Fe between surface and abyssal waters depending on entry velocity and evaporation.

This preprint has been withdrawn.

Rudraswami N. Gowda et al.

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Rudraswami N. Gowda et al.

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Extraterrestrial dust as a source of bioavailable Fe for the ocean productivity N. G. Rudraswami https://doi.org/10.5061/dryad.zcrjdfn7t

Rudraswami N. Gowda et al.

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Short summary
Bioavailable Fe is necessary component for phytoplankton to survive and will play a crucial role in reducing the carbon dioxide in the atmosphere. The Fe increase the primary productivity of ocean which is rare in the isolated region of the ocean. Here, the role of extraterrestrial dust become significant as smoke from the ablation and etching also contribute Fe to this organism which in turn reduces the adverse effect on the climate by acting as sink of carbon dioxide.
Bioavailable Fe is necessary component for phytoplankton to survive and will play a crucial role...
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