Annual rings indicated the important role of climate in solar activity

The results of wavelet analysis indicate that the match temperature changes 11 — and 22-year cycles (under a thick line) is almost complete. It is unlikely that the concentration of carbon dioxide could be the determining factor of temperature fluctuations with such recurring intervals. (Here and below illustrate Y. Muraki et al.)

 July 23, 2013. For years, scientists heated debate, discuss the question of the connection of the solar cycle and global climate. This is understandable: the modern climate policy requires resources, and if solar activity is actually important for the climate (which is at present the scientific mainstream, rather negated), then our plan to combat global warming is fundamentally wrong.

We recall one of the main arguments "sunfish": the impact of carbon dioxide on the climate essential for global climatic optima (such as warming The Medieval Climatic Optimum) And lows (like Little Ice Age, partially coincided with Maunder minimum sunspot number). In the latter case (XVII-XVIII centuries) deal, as it is known, came to the sleigh traffic on the Thames, the Bosphorus and the systematic freezing strong July and August frost outside Moscow.

To test whether and to what degree the almost complete disappearance of sunspots in the Maunder minimum is associated with our global climate, a team of scientists led by Yasushi Muraki (Yasushi Muraki) Of the Nagoya University(Japan) investigated the annual rings of a tree Murodzhi temple in Nara Prefecture. At the time of the death of the tree was 391 years old, which, according to the authors, is sufficient to obtain the desired correlation. Using Fourier analysis to study the rings, the researchers came to an unexpected conclusion. Fluctuations in the thickness of the rings, even in the midst of the Maunder minimum issue two types of cycles: a duration of 12 and 25 years — despite the almost complete absence of sunspots during that period. The result was verified by the example of a temple in Nagoya and other locations where there are trees, too, Cryptomeria japonica, who lived in the years n 64-1988. e., as well as the preserved historical data for elevation, passed in the same period of the Swiss glaciers.

On a large array of data all the cycles of temperature change (the retreat of glaciers and the growth of trees) were equal to 11 and 22 years — that is in line with the cycle of solar activity.

What could this mean? As is known, any data on climate change, based on the thickness of the annual rings, recently questioned, as they almost never coincide with the results of the climate simulation of past years, when direct temperature measurement is not cited. At the same time, can not be denied: the trees do not grow well in cold years and vice versa. If the study of Japanese will not be overturned in the near future, climatologists awaits a tough debate about exactly how sunspots manage to exert a decisive influence on the temperature fluctuations on Earth.

Interestingly, the data of Swiss glaciers Little Ice Age coincide with the annual growth rings of trees and Japanese also indicate pronounced solar cycles.

In fact, by all accounts, a slight increase in the luminosity of the active Sun will not be responsible for the alternation of cold years with warm. Consequently, there is still a valid mechanism, which we do not see. In principle, the theory of such a mechanism is: Henrik Svensmark (Henrick Svensmark) Of the Danish Technical University, eg believes, what solar activity, deflecting cosmic rays, blocks the formation of clouds on Earth, and reduces its albedo, warming the planet in periods of excessive sun spots and cooling during the Maunder minimum like. However, the views of Mr. Svensmark are neither accepted nor compatible with the current climatological consensus is considered a key factor in global climate carbon dioxide in the atmosphere.

Based on: arXiv
Source: Kompyulenta

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