Swansong biospheres II: the final signs of life on terrestrial planets near the end of their habitable lifetimes

@article{OMalleyJames2014SwansongBI,
  title={Swansong biospheres II: the final signs of life on terrestrial planets near the end of their habitable lifetimes},
  author={J. O'Malley-James and C. Cockell and J. Greaves and J. Raven},
  journal={International Journal of Astrobiology},
  year={2014},
  volume={13},
  pages={229 - 243}
}
Abstract The biosignatures of life on Earth do not remain static, but change considerably over the planet's habitable lifetime. Earth's future biosphere, much like that of the early Earth, will consist of predominantly unicellular microorganisms due to the increased hostility of environmental conditions caused by the Sun as it enters the late stage of its main sequence evolution. Building on previous work, the productivity of the biosphere is evaluated during different stages of biosphere… Expand
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References

SHOWING 1-10 OF 152 REFERENCES
Swansong biospheres: refuges for life and novel microbial biospheres on terrestrial planets near the end of their habitable lifetimes
TLDR
The end stage of habitability on Earth is the focus of this work, and a simple, latitude-based climate model incorporating eccentricity and obliquity variations is used as a guide to the temperature evolution of the Earth over the next 3 Gyr. Expand
Biosignatures of early earths.
  • C. Pilcher
  • Environmental Science, Biology
  • Astrobiology
  • 2003
TLDR
Inferred characteristics of Earth's earliest biosphere and studies of modern microbial ecosystems that share some of those characteristics suggest that organosulfur compounds, particularly methanethiol (CH(3)SH, the sulfur analog of methanol), may have been biogenic products on early Earth. Expand
Life span of the biosphere
There has been life on Earth for at least 3,500 Myr but the assumption that a comparable future lies ahead may not be justified. Main sequence stars appear to increase their burning rate as they age.Expand
The life span of the biosphere revisited
TLDR
A more elaborate model that includes a more accurate treatment of the greenhouse effect of CO2, a biologically mediated weathering parameterization, and the realization that C4 photosynthesis can persist to much lower concentrations of atmospheric CO2 is found to find that a C4-plant-based biosphere could survive for at least another 0.9 Gyr to 1.5 Gyr after the present time. Expand
Remote sensing of planetary properties and biosignatures on extrasolar terrestrial planets.
TLDR
It is found that both the mid-IR and the visible to near-IR wavelength ranges offer valuable information regarding biosignatures and planetary properties; therefore both merit serious scientific consideration for TPF and Darwin. Expand
Ozone and life on the Archaean Earth
  • C. Cockell, J. Raven
  • Environmental Science, Biology
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2007
TLDR
It can be shown that early land masses and the photic zone of the oceans could have been colonized, suggesting that high UV radiation would not have prevented the colonization of land and it is unlikely that the fossil record can be used to constrain estimates of the UV radiation environment of the early Earth. Expand
Life in deep subsurface
Life extends far deeper into the Earth's subsurface than presumed possible 30 years ago. In the past, it was assumed that life is a surface phenomenon, and that even “hardy prokaryotic types” are notExpand
A sulfur-based survival strategy for putative phototrophic life in the venusian atmosphere.
TLDR
It is made the argument that such an organism may utilize sulfur allotropes present in the venusian atmosphere, particularly S(8), as a UV sunscreen, as an energy-converting pigment, or as a means for converting UV light to lower frequencies that can be used for photosynthesis. Expand
Carbon in the atmosphere and terrestrial biosphere in the 21st century
  • Y. Malhi
  • Environmental Science, Medicine
  • Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences
  • 2002
TLDR
A review of the recent evidence for the magnitude and spatial distribution of this ‘terrestrial carbon sink’, drawing on current research on the global atmospheric distribution and transport of carbon dioxide, oxygen and their isotopes, and direct measurement of CO2 fluxes above various biomes. Expand
An astrophysical view of Earth-based metabolic biosignature gases.
TLDR
Key points of Earth-based microbial metabolism that are useful to the astrophysical search for biosignature gases on exoplanets are reviewed, including a list of primary and secondary metabolism gas byproducts. Expand
...
1
2
3
4
5
...