Sentences with phrase «year periodicity»

The 11 - year averaging period minimizes the effect of variability due to the 10 — 12 year periodicity of solar irradiance as well as irregular El Niño / La Niña warming / cooling in the tropical Pacific Ocean.

Over time the 60 year periodicity essentially zeroes out.

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.

The 4.4 interpreted - year periodicity occurs within the ENSO frequency band, and if this documentation of ENSO - like interannual climate change is correct, then it suggests that ENSO operated at times during the warm Earth conditions characterizing the late Tertiary.

Credit: NASA / SDO ============================================================================================================================ The spots on the surface on the sun come and go with an 11 - year periodicity known as the solar cycle.

And a study by Rahmstorf (2003) also concludes that the LIA may be the most recent cold phase of the D - O cycle, and his research suggests that the 1,470 - year periodicity is so regular that it's more likely due to an orbital cycle than a solar cycle.

(see Part 1 of the Link) The way to go is simply to state clearly what the working hypothesis is and what are the reasonable assumptions that went into them — in my case the basic assumptions are that the current warming peak is a synchronous peak in the 60 and 960 year periodicities and that the 10Be and neutron count records are the best proxy for solar activity.

The underlying 20th century rise is part of the 960 year periodicity.

It is demonstrated that the periodicity of the solid runoff correlates with the 18.6 - year periodicity of the Earth's angular velocity variations caused by the 18.6 - year cyclicity of the variability of lunisolar tides.

A ∼ 60 - year periodicity was detected the vortex strength which affects the evolution of the large - scale atmospheric circulation.

Both the northern and southern Pacific have the same 20 to 30 year periodicity — for which we have sought a stochastic control variable over decades.

It shows intriguing 20 to 30 years periodicities in ENSO frequency — which also show up in the long proxy of Tessa Vance and colleagues.

Hubert Lamb, considered to be the most meticulous climatologist of all time, used wiggle - matching in this wind data graph he published in 1988: He had plotted up 600 years of wind data at London, noted a 200 year periodicity and copied the line...

The results also show that the century - type cycle of Gleissberg has a wide frequency band with a double structure consisting of 50 — 80 years and 90 — 140 year periodicities.

However, during the preceding MWP the 20 year cycle was replaced by a longer scale cycle centered near a period of 43 years with a further 11.5 year periodicity.