Ozone and life on the Archaean Earth

@article{Cockell2007OzoneAL,
  title={Ozone and life on the Archaean Earth},
  author={Charles S. Cockell and John A. Raven},
  journal={Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences},
  year={2007},
  volume={365},
  pages={1889 - 1901}
}
  • C. Cockell, J. Raven
  • Published 15 July 2007
  • Environmental Science
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
The trace gas ozone, produced in the present-day stratosphere, acts as a screen for UV radiation between 195 and approximately 290 nm, depending on its column abundance. On the anoxic Archaean Earth, such an ozone screen would not have existed. Although the presence of other screens, such as an organic haze, might have ameliorated the UV radiation flux, even assuming the worst-case scenario (no UV screen), it can be shown that early land masses and the photic zone of the oceans could have been… 

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References

SHOWING 1-10 OF 73 REFERENCES

Sulfur, ultraviolet radiation, and the early evolution of life

TLDR
A warm, sulfur-rich, primitive atmosphere is consistent with inferences drawn from molecular phylogeny, which suggest that some of the earliest organisms were thermophilic bacteria that metabolized elemental sulfur.

A Photobiological History of Earth

TLDR
During the history of life on Earth four distinct periods of photobiological history can be recognized, the period during which UV radiation influenced chemistry on prebiotic Earth during the Hadean era dominated by the involvement of UV radiation in organic complexification.

Ozone depletion: ultraviolet radiation and phytoplankton biology in antarctic waters.

TLDR
Results from a 6-week cruise in the marginal ice zone of the Bellingshausen Sea in austral spring of 1990 indicated that O3-dependent shifts of in-water spectral irradiances alter the balance of spectrally dependent phytoplankton processes, including photoinhibition, photoreactivation, photoprotection, and photosynthesis.

Ecosystems, evolution, and ultraviolet radiation

This book discusses UV radiation, its effects on ecosystems and the likely evolutionary consequences of changed UV radiation environments, past, present and future. The first two chapters examine the

How Earth's atmosphere evolved to an oxic state: A status report

Atmospheric carbon dioxide concentrations before 2.2 billion years ago

TLDR
The results suggest that either the Earth's early climate was much more sensitive to increases in pco2 than has been thought, or that one or more greenhouse gases other than CO2 contributed significantly to the atmosphere's radiative balance during the late Archaean and early Proterozoic eons.

Ultraviolet selection pressure on the earliest organisms.

  • C. Sagan
  • Physics
    Journal of theoretical biology
  • 1973

Geochemical evidence for terrestrial ecosystems 2.6 billion years ago

TLDR
Data show that the organic matter in some Au/U-rich conglomerates and ancient soils of 2.3-Gyr age very probably represents remnants of microbial mats that developed on the soil surface between 2.6 and 2.7 Gyr ago, which places the development of terrestrial biomass more than 1.4 billion years earlier than previously reported.

UV shielding of NH3 and O2 by organic hazes in the Archean atmosphere

The late Archean atmosphere was probably rich in biologically generated CH4 and may well have contained a hydrocarbon haze layer similar to that observed today on Saturn's moon, Titan. Here we

A Coupled Ecosystem-Climate Model for Predicting the Methane Concentration in the Archean Atmosphere

TLDR
A simple coupled ecosystem-climate model is described that can predict levels of atmospheric CH4, CO2, and H2 during the Late Archean, and finds that methanogenic bacteria should have converted most of the available atmospheric H2 intoCH4, and that CH4 may have been equal in importance to CO2 as a greenhouse gas.
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