Ozone Depletion Due to a Milky Way Gamma-Ray Burst

Details Ozone Depletion Due to a Milky Way Gamma-Ray Burst Ozone Depletion Due to a Milky Way Gamma-Ray Burst

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.4007t&link_type=abstract

American Astronomical Society Meeting 205, #40.07; Bulletin of the American Astronomical Society, Vol. 36, p.1408

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Based on cosmological rates, it is probable that at least once in the last Gy the Earth has been irradiated by a gamma-ray burst in our Galaxy from within 2 kpc. Using a two-dimensional atmospheric model we have computed the effects upon the Earth's atmosphere of such a burst. A ten second burst delivering 100 kJ/m2 to the Earth results in globally averaged ozone depletion of over 40 approaching 90 dramatic implications for life since it leads to as much as tenfold increases in solar UVB radiation at the Earth's surface. Widespread extinctions are likely, based on extrapolation from UVB sensitivity of modern organisms.
This work was supported by Neil Gehrels at NASA GSFC and NASA grant NNG04GM41G.

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