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Media type:
E-Article
Title:
Limits for Combustion in Low O 2 Redefine Paleoatmospheric Predictions for the Mesozoic
Contributor:
Belcher, C. M.;
McElwain, J. C.
Published:
American Association for the Advancement of Science (AAAS), 2008
Published in:
Science, 321 (2008) 5893, Seite 1197-1200
Language:
English
DOI:
10.1126/science.1160978
ISSN:
0036-8075;
1095-9203
Origination:
Footnote:
Description:
Several studies have attempted to determine the lower limit of atmospheric oxygen under which combustion can occur; however, none have been conducted within a fully controlled and realistic atmospheric environment. We performed experimental burns (using pine wood, moss, matches, paper, and a candle) at 20°C in O 2 concentrations ranging from 9 to 21% and at ambient and high CO 2 (2000 parts per million) in a controlled environment room, which was equipped with a thermal imaging system and full atmospheric, temperature, and humidity control. Our data reveal that the lower O 2 limit for combustion should be increased from 12 to 15%. These results, coupled with a record of Mesozoic paleowildfires, are incompatible with the prediction of prolonged intervals of low atmospheric O 2 levels (10 to 12%) in the Mesozoic.