Meteoric smoke fallout over the Holocene epoch revealed by iridium and platinum in Greenland ice

Paolo Gabrielli, Carlo Barbante (), John M. C. Plane, Anita Varga, Sungmin Hong, Giulio Cozzi, Vania Gaspari, Frédéric A. M. Planchon, Warren Cairns, Christophe Ferrari, Paul Crutzen, Paolo Cescon and Claude F. Boutron
Additional contact information
Paolo Gabrielli: Laboratoire de Glaciologie et Géophysique de l'Environnement (UMR CNRS/ Université Joseph Fourier 5183)
Carlo Barbante: University of Venice, Ca' Foscari
John M. C. Plane: University of East Anglia
Anita Varga: University of Venice, Ca' Foscari
Sungmin Hong: Korea Polar Research Institute
Giulio Cozzi: University of Venice, Ca' Foscari
Vania Gaspari: University of Venice, Ca' Foscari
Frédéric A. M. Planchon: University of Venice, Ca' Foscari
Warren Cairns: University of Venice, Ca' Foscari
Christophe Ferrari: Laboratoire de Glaciologie et Géophysique de l'Environnement (UMR CNRS/ Université Joseph Fourier 5183)
Paul Crutzen: Max Planck Institute for Chemistry
Paolo Cescon: University of Venice, Ca' Foscari
Claude F. Boutron: Laboratoire de Glaciologie et Géophysique de l'Environnement (UMR CNRS/ Université Joseph Fourier 5183)

Nature, 2004, vol. 432, issue 7020, 1011-1014

Abstract: Abstract An iridium anomaly at the Cretaceous/Tertiary boundary layer has been attributed to an extraterrestrial body that struck the Earth some 65 million years ago1. It has been suggested that, during this event, the carrier of iridium was probably a micrometre-sized silicate-enclosed aggregate2 or the nanophase material of the vaporized impactor3. But the fate of platinum-group elements (such as iridium) that regularly enter the atmosphere via ablating meteoroids remains largely unknown. Here we report a record of iridium and platinum fluxes on a climatic-cycle timescale, back to 128,000 years ago, from a Greenland ice core4. We find that unexpectedly constant fallout of extraterrestrial matter to Greenland occurred during the Holocene, whereas a greatly enhanced input of terrestrial iridium and platinum masked the cosmic flux in the dust-laden atmosphere of the last glacial age. We suggest that nanometre-sized meteoric smoke particles5,6, formed from the recondensation of ablated meteoroids in the atmosphere at altitudes >70 kilometres, are transported into the winter polar vortices by the mesospheric meridional circulation7 and are preferentially deposited in the polar ice caps. This implies an average global fallout of 14 ± 5 kilotons per year of meteoric smoke during the Holocene.

Date: 2004
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DOI: 10.1038/nature03137

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