Photobiological Effects at Earth's Surface Following a 50 pc Supernova

@inproceedings{Thomas2017PhotobiologicalEA,
  title={Photobiological Effects at Earth's Surface Following a 50 pc Supernova},
  author={Brian C. Thomas},
  booktitle={Astrobiology},
  year={2017}
}
We investigated the potential biological impacts at Earth's surface of stratospheric O3 depletion caused by nearby supernovae known to have occurred about 2.5 and 8 million years ago at about 50 pc distance. New and previously published atmospheric chemistry modeling results were combined with radiative transfer modeling to determine changes in surface-level solar irradiance and biological responses. We find that UVB irradiance is increased by a factor of 1.1 to 2.8, with large variation in… CONTINUE READING
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