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The History of the UV radiation climate of the earth: theoretical and space-based observations

Cockell, Charles S. and Horneck, Gerda (2001). The History of the UV radiation climate of the earth: theoretical and space-based observations. Photochemistry and Photobiology, 73(4) pp. 447–451.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1562/0031-8655(2001)073%3C0447:THOTUR%3E2.0.CO;2
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Abstract

In the Archean era (3.8–2.5 Ga ago) the Earth probably lacked a protective ozone column. Using data obtained in the Earth's orbit on the inactivation of Bacillus subtilis spores we quantitatively estimate the potential biological effects of such an environment. We combine this practical data with theoretical calculations to propose a history of the potential UV stress on the surface of the Earth over time. The data suggest that an effective ozone column was established at a pO2 of 5 × 10−3 present atmospheric level. The improvement in the UV environment on the early Proterozoic Earth might have been a much more rapid event than has previously been supposed, with DNA damage rates dropping by two orders of magnitude in the space of just a few tens of millions of years. We postulate that a coupling between reduced UV stress and increased pO2 production could have contributed toward a positive feedback in the production of ozone in the early Proterozoic atmosphere. This would contribute to the apparent rapidity of the oxidation event. The data provide an evolutionary perspective on present-day Antarctic ozone depletion.

Item Type: Journal Article
ISSN: 0031-8655
Extra Information: Some of the symbols may not have transferred correctly into this bibliographic record.
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 3138
Depositing User: Users 6044 not found.
Date Deposited: 14 Aug 2006
Last Modified: 02 Sep 2011 09:38
URI: http://oro.open.ac.uk/id/eprint/3138
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