Cometary impacts and ice-ages

Details Cometary impacts and ice-ages Cometary impacts and ice-ages

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.275..367h&link_type=abstract

Astrophysics and Space Science, v. 275, Issue 4, p. 367-376 (2001).

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

Cycles of glaciation with an average period of ~ 100 kyr are mediated by impacts of cometary bolides. Ice-age conditions are dry and dusty with low rates of precipitation. Comets in the mass range 10^15 -10^16 g impacting the oceans could release enough water vapour into the atmosphere to enhance a depleted greenhouse effect. The energy deposited in the oceans would also warm the surface layers, thus starting up an evaporation-precipitation cycle which ushers in warmer interglacial interludes. The latter have neutral stability and are necessarily short-lived, eventually drifting back to glacial conditions on timescales of ~ 10 kyr.

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