Sentences with phrase «year periodicity known»

Not exact matches

Amongst the well - known proxies that have revealed a millennial - scale climate variability during the Holocene, the ice - rafted debris (IRD) indices in the North Atlantic developed by Bond et al. (1997, 2001) present a cyclicity of 1470 ± 500 years, which matches the 1228 ± 327 - year periodicity evidenced in the Mar Menor, considering the respective uncertainties in the periodicities.

It has also been known that a component of the variability seems to have a full period of about 60 years although the evidence has not been strong on any real periodicity or even quasi-periodicity.

``... the occurrence of grand minima depicts a weak (marginally significant) quasi-periodicity of 2000 — 2400 years, which is a well - known period in 14C data... no clear periodicities are observed in the occurrence of grand maxima.»

I don't know if the 4672 - year periodicity is also present in the ¹⁴ C evidence.

The periodicity at 24 interpreted years is consistent with the well - known Hale solar cycle.