The evolution and variability of atmospheric ozone over geological time |
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| Authors: | Joel S Levine Paul B Hays James CG Walker |
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| Institution: | Atmospheric Environmental Sciences Division, NASA Langley Research Center, Hampton, Virginia 23665, USA;Department of Atmospheric and Oceanic Science, The University of Michigan, Ann Arbor, Michigan 48109, USA;Arecibo Observatory, National Astronomy and Ionosphere Center, Arecibo, Puerto Rico 00612 |
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| Abstract: | The rise of atmospheric O3 as a function of the evolution of O2 has been investigated using a one-dimensional steady-state photochemical model based on the chemistry and photochemistry of Ox(O3, O, O(1D)), N2O, NOx(NO, NO2, HNO3), H2O, and HOx(H, OH, HO2, H2O2) including the effect of vertical eddy transport on the species distribution. The total O3 column density was found to maximize for an O2 level of 10?1 present atmospheric level (PAL) and exceeded the present total O3 column by about 40%. For that level of O2, surface and tropospheric O3 densities exceeded those of the present atmosphere by about an order of magnitude. Surface and tropospheric OH densities of the paleoatmosphere exceeded those of the present atmosphere by orders of magnitude. We also found that in the O2-deficient paleoatmosphere, N2O (even at present atmospheric levels) produces much less NOx than it does in the present atmosphere. |
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