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Thursday, October 11, 2012

Tuning History - Climate Blues in A5

Orbital influences on climate can also be tuning influence of orbit on climate, power chords like fifths may resolve some to the mystery.

I studying the correlation of estimated climate change in deep ocean core samples I noticed that precession, the red haired step child of orbital parameters, appears strongly as an ~23,000 year response and that there appears to be a 4,300 year recurrent decay from the precessional impacts.  Obliquity and Eccentricity are considered the big orbital players in the climate band.

According to:

To tune or not to tune: Detecting orbital variability in Oligo-Miocene climate records

Cristian Proistosescu a,⁎, Peter Huybers a, Adam C. Maloof b

" A different behavior is observed for the 1/23 kyr−1 peak where, for a moderate amount of tuning, the significance of the peak increases dramatically. The robustness of the results for precession across testing configuration lead us to confidently conclude that significant precession band variability is present in the ODP 1218 δ18O record. This result is, to our knowledge, the first unbiased statistical test for orbital variability using orbitally tuned records."


"For ODP 1218 the estimated autocorrelation coefficient is ϕ=0.87 and the variance of the ∈ disturbances is 0.41 at a time step of 4.3 kyr."

A little "tuning" goes a long way as long as it is compared with untuned data.

This is not Earth shattering news for most, but the locating the potential source of Bond Events kinda blows wind up my skirt :)

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