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Potential climatic effects of meteoric smoke in the Earth's paleo-atmosphere

Saunders, RW, Forster, PM and Plane, JMC (2007) Potential climatic effects of meteoric smoke in the Earth's paleo-atmosphere. Geophysical Research Letters, 34 (16). ISSN 0094-8276

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Abstract

Modelling of the growth of meteoric smoke in the Earth's atmosphere, by assuming the formation of either simple spherical ( compact) particles or, more realistically, fractal ( porous) aggregates, highlights important differences in the predicted atmospheric size distributions as a function of altitude. The calculated UV extinction and direct radiative forcing ( DRF) of these types of particles is also quite different. It is shown that, with regard to ( a), forming a UV barrier before the presence of significant ozone levels in the atmosphere and ( b), triggering 'snowball Earth' glaciations by negative DRF, fractal smoke particles are unlikely to have been important even if the flux of interplanetary dust into the atmosphere was 3 orders of magnitude higher than the present day. However, if these particles are effective ice nuclei, then subsequent indirect forcing through ice cloud formation could have made a more significant contribution to the onset of ancient glaciation episodes.

Item Type: Article
Copyright, Publisher and Additional Information: © 2007 American Geophysical Union. Reproduced in accordance with the publisher's self-archiving policy.
Keywords: cosmic dust, stratospheric aerosol, snowball glaciations, ice, mesophere, radiation, particles, chemistry, analogs, cloud
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Chemistry (Leeds)
The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds)
Depositing User: Symplectic Publications
Date Deposited: 13 Oct 2011 12:06
Last Modified: 05 Jun 2014 05:24
Published Version: http://dx.doi.org/10.1029/2007GL029648
Status: Published
Publisher: American Geophysical Union
Identification Number: 10.1029/2007GL029648
URI: http://eprints.whiterose.ac.uk/id/eprint/43317

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