Atmospheric oxygen over Phanerozoic time
نویسندگان
چکیده
منابع مشابه
Modeling atmospheric O2 over Phanerozoic time
A carbon and sulfur isotope mass balance model has been constructed for calculating the variation of atmospheric O2 over Phanerozoic time. In order to obtain realistic O2 levels, rapid sediment recycling and O2-dependent isotope fractionation have been employed by the modelling. The dependence of isotope fractionation on O2 is based, for carbon, on the results of laboratory photosynthesis exper...
متن کاملOn flying insect size and Phanerozoic atmospheric oxygen.
In a recent article in PNAS, Clapham and Karr (1) related the maximum wing length (MWL) of different Odonatoptera and Orthoptera species to Phanerozoic atmospheric oxygen partial pressure (pO2) as predicted by the GEOCARBSULF model (2). They argued that the MWL data assigned to 10-Myr periods is well correlated with elevated Paleozoic pO2 levels, but that the correlation weakens and is ultimate...
متن کاملIsotope fractionation and atmospheric oxygen: implications for phanerozoic O(2) evolution
Models describing the evolution of the partial pressure of atmospheric oxygen over Phanerozoic time are constrained by the mass balances required between the inputs and outputs of carbon and sulfur to the oceans. This constraint has limited the applicability of proposed negative feedback mechanisms for maintaining levels of atmospheric O(2) at biologically permissable levels. Here we describe a...
متن کاملGEOCARBSULF: A combined model for Phanerozoic atmospheric O2 and CO2
A model for the combined long-term cycles of carbon and sulfur has been constructed which combines all the factors modifying weathering and degassing of the GEOCARB III model [Berner R.A., Kothavala Z., 2001. GEOCARB III: a revised model of atmospheric CO2 over Phanerozoic time. Am. J. Sci. 301, 182–204] for CO2 with rapid recycling and oxygen dependent carbon and sulfur isotope fractionation o...
متن کاملEvolution of Atmospheric Oxygen
changes in sea ice thickness and the relative amounts of open water on surface air temperatures through the year. Figure 2 shows that the impact on the surface air temperatures is rather small during the summer; however, during the winter, when there is a large difference between the surface temperature of ocean water and of sea ice, the impact of small changes in the area of open ocean on surf...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1999
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.96.20.10955