Climate and Human Civilization over the last 18,000 years

I recommend readers examine this post at WUWT as it puts multiple grand minimums in perspective, in that they follow long warm periods which promoted human growth and expansion. It is interesting to note that the cold periods were accompanied by long-term droughts. Droughts that disrupted civilizations and in many cases promote collapse. Highly recommend reading.

Watts Up With That?

Guest essay by Andy May

This is an updated timeline of climatic events and human history for the last 18,000 years. The original timeline was posted in 2013. The updated full size (Ansi E size or 34×44 inches) Adobe Reader version 8 PDF can be downloaded here or by clicking on Figure 1. It prints pretty well on 11×17 inch paper and very well on 17×22 inch paper or larger. To see the timeline in full resolution or to print it, you must download it. It is not copyrighted, but please acknowledge the author if you use it.

Figure 1 -click for a much larger, printable poster (PDF)

References to the images and data are given in this essay as hyperlinks. I’ve done my best to verify the accuracy of the content by checking multiple sources. When references had different dates for the same event, I chose the most commonly…

View original post 5,101 more words

Advertisement

A Dalton-like Amplitude for Solar Cycle 25

Some insight into potential solar activity during the next solar cycle. A Dalton Minimum will most likely not be as severe as a Maunder. Only time will solve the issue.  The comment discussion is most interesting, highly recommended reading.

Watts Up With That?

Guest essay by David Archibald

The most accurate method for predicting the amplitude of the next solar cycle is to use the strength of the solar polar magnetic fields at solar minimum. But with solar minimum likely to be three years away, who can wait that long?

The strength of the solar polar magnetic fields at solar minimum is a very accurate indicator of the maximum amplitude of the following solar cycle, as per this graph from Dr David Hathaway of NASA:

Up until late 2014, solar polar magnetic field strength was still quite weak as shown in this graph of the history of that parameter by solar cycle from the last four solar minima:

Over the last year the solar polar magnetic fields of Solar Cycle 24 have strengthened to almost the level of Solar Cycle 23 at the same stage. But for the previous two cycles, they also…

View original post 368 more words

1709; The Disparate Economic And Political Impact of Weather And Climate

Source: 1709; The Disparate Economic And Political Impact of Weather And Climate

I have reblogged this post by Tim Ball from WUWT so readers can read about the climate during the Little Ice Age and the Maunder Minimum. We might see a repeat of these climate conditions during the Next Grand Minimum, although we will have modern heating systems, if we still have some oil and coal to fire the boilers.

New studies flip climate-change notions upside down

The Nation: Cold Sun rising

The sun will go into “hibernation” mode around 2030, and it has already started to get sleepy. At the Royal Astronomical Society’s annual meeting in July, Professor Valentina Zharkova of Northumbria University in the UK confirmed it – the sun will begin its Maunder Minimum (Grand Solar Minimum) in 15 years. Other scientists had suggested years ago that this change was imminent, but Zharkova’s model is said to have near-perfect accuracy.

More HERE

GLOBAL COOLING: Decade long ice age predicted as sun ‘hibernates’

SCIENTISTS claim we are in for a decade-long freeze as the sun slows down solar activity by up to 60 per cent.

A team of European researchers have unveiled a scientific model showing that the Earth is likely to experience a “mini ice age” from 2030 to 2040 as a result of decreased solar activity.

Their findings will infuriate environmental campaigners who argue by 2030 we could be facing increased sea levels and flooding due to glacial melt at the poles.

However, at the National Astronomy Meeting in Wales, Northumbria University professor Valentina Zharkova said fluctuations an 11-year cycle of solar activity the sun goes through would be responsible for a freeze, the like of which has not been experienced since the 1600s.

From 1645 to 1715 global temperatures dropped due to low solar activity so much that the planet experienced a 70-year ice age known as Maunder Minimum which saw the River Thames in London completely frozen.

More HERE.