KOPRI Repository

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

Cited 0 time in scopus
Metadata Downloads
Title
Meteoric smoke fallout over the Holocene epoch revealed by iridium and platinum in Greenalnd ice
Other Titles
그린랜드 빙하의 이리듐과 백금 성분을 이용한 홀로세 meteoric smoke 플럭스 연구
Authors
C. Barbante
C. Ferrari
G. Cozzi
P. Gabrielli
Hong, Sung-Min
W. Cairns
F.A.M. Planchon
V. Gaspari
A. Varga
J.M. Plane
Keywords
Greenland ice; Iridium; Meteoric smoke; Platinum; Polar vortex
Issue Date
2004
Citation
C. Barbante, et al. 2004. "Meteoric smoke fallout over the Holocene epoch revealed by iridium and platinum in Greenalnd ice". NATURE, 432(7020): 1011-1014.
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 ago. It has been suggested that, during this event, the carrier of iridium was probably a micrometre-sized silicate-enclosed aggregate or the nano-phase material of the vaporized impactor. But the fate of platinum-group elements (such as iridium) that reguarly 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 core. 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 particles, 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 circulation and are preferentially deposited in the polar ice caps. This implies an average global fallout of 14 kilotons per year of meteoric smoke during the Holocene.
URI
http://repository.kopri.re.kr/handle/201206/6622
Files in This Item
General Conditions
      ROMEO Green
    Can archive pre-print and post-print or publisher's version/PDF
      ROMEO Blue
    Can archive post-print (ie final draft post-refereeing) or publisher's version/PDF
      ROMEO Yellow
    Can archive pre-print (ie pre-refereeing)
      ROMEO White
    Archiving not formally supported

    qrcode

    Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

    Browse