Harmonic Analysis of Worldwide Temperature Proxies for 2000 Years

by H.J. Lüdecke and C.O. Weiss, April 27, 2017 in TheOpenAtm.Sci.J.


The Sun as climate driver is repeatedly discussed in the literature but proofs are often weak. In order to elucidate the solar influence, we have used a large number of temperature proxies worldwide to construct a global temperature mean G7 over the last 2000 years. The Fourier spectrum of G7 shows the strongest components as ~1000-, ~460-, and ~190 – year periods whereas other cycles of the individual proxies are considerably weaker. The G7 temperature extrema coincide with the Roman, medieval, and present optima as well as the well-known minimum of AD 1450 during the Little Ice Age. We have constructed by reverse Fourier transform a representation of G7 using only these three sine functions, which shows a remarkable Pearson correlation of 0.84 with the 31-year running average of G7. The three cycles are also found dominant in the production rates of the solar-induced cosmogenic nuclides 14C and 10Be, most strongly in the ~190 – year period being known as the De Vries/Suess cycle. By wavelet analysis, a new proof has been provided that at least the ~190-year climate cycle has a solar origin.

Modulation of Ice Ages via Precession and Dust-Albedo Feedbacks

by Ralph Ellis, August 2018 in FriendsofScience

Why do ice ages occur? Surprisingly, even after many decades of paleoclimatic research we simply do not know for sure. Most scientists will agree that ice age cycles have something to do with precession: the slow wobble of the axis of the Earth. The ancient Egyptians and Greeks knew of precession and called it the Great Year, because it gives warm and cool seasons over its approximate 23,000-year cycle. But there is a problem with invoking the Great Year as the regulator of ice ages, because we should really get an interglacial warming every 23,000 years or so. And we don’t – they only happen every fourth or fifth Great Year.

But why should the global climate give a selective response to orbital warming and cooling? (Called ‘forcing’ in the climate trade.) This is one of the great unknowns of modern science.

Why I Don’t Deny: Confessions of a Climate Skeptic — Part 1

by Kip Hansen, August 25, 2018 in WUWT

I have often been asked “Why do you deny climate change?”  I am always stumped by the question.  It is rather like being asked “Why do you torture innocent animals?”  The questioner is not merely asking for information, they are always making an accusation — an accusation that they consider very serious and a threat to themselves and others.

The reason it stumps me is that, as you have guessed already, I do not deny climate change (and I do not torture innocent animals — nor even guilty ones).  And there is nothing about me or my behavior, present or past, that I am aware of, that would lead any reasonable person to think such a thing of me.

I am thoroughly guilty though of being very skeptical of what is generally referred to as the Climate Consensus — usually said to be represented by the latest reports and policy recommendations put out by the Intergovernmental Panel on Climate Change (IPCC) and its supporters; political, ideological and scientific.  I suppose it is this that leads to the false accusation of “denying climate change”.

And there is the crux of the matter — it is something in the mind of the accuser, not any action of the accused, which leads to the false accusation.