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

Cited 113 time in wos
Cited 119 time in scopus
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 iceIridiumMeteoric smokePlatinumPolar 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
https://repository.kopri.re.kr/handle/201206/6622
DOI
http://dx.doi.org/10.1038/nature03137
Type
Article
Indexed
NSC
Appears in Collections  
2004-2005, 지구대기 연직구조별 대기환경 특성 및 빙하연구 (04-05) / Hong, Sungmin (PP04105, PE05003)
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