Timing of abrupt climate change: A precise clock

Details Timing of abrupt climate change: A precise clock Timing of abrupt climate change: A precise clock

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30j..17r&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 10, pp. 17-1, CiteID 1510, DOI 10.1029/2003GL017115

Physics

54

Global Change: Climate Dynamics (3309), Meteorology And Atmospheric Dynamics: Paleoclimatology, Global Change: Solar Variability, Meteorology And Atmospheric Dynamics: Theoretical Modeling, Global Change: Oceans (4203)

Scientific paper

Many paleoclimatic data reveal a ~1,500 year cyclicity of unknown origin. A crucial question is how stable and regular this cycle is. An analysis of the GISP2 ice core record from Greenland reveals that abrupt climate events appear to be paced by a 1,470-year cycle with a period that is probably stable to within a few percent; with 95% confidence the period is maintained to better than 12% over at least 23 cycles. This highly precise clock points to an origin outside the Earth system; oscillatory modes within the Earth system can be expected to be far more irregular in period.

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