JoNova

A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).


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New paper shows solar activity is linked to the Greenland climate even 20,000 years ago

This new paper by Adophi et al uses beryllium, oxygen and carbon isotopes from Greenland ice cores right back as far as the depth of the last ice age, 22,500 years ago, and finds there is a link between solar activity and the climate. It follows these proxies of temperature and solar activity as the planet warmed to the start of the Holocene 10,000 years ago.

It is gaining attention in The Daily Mail, with the headline:

Is the SUN driving climate change? Solar activity – ‘and not just humans’ – could be increasing global warming, study claims

During the last glacial maximum, Sweden was covered in a thick ice sheet that stretched all the way down to northern Germany and sea levels were more than 330ft (100m) lower than they are today, because the water was frozen in the extensive ice caps.

‘The study shows an unexpected link between solar activity and climate change,’ Dr Muscheler said in a press release.

‘It shows both that changes in solar activity are nothing new and that solar activity influences the climate, especially on a regional level. 

Dr Joanna Haigh, Professor [...]

Sun controls half of the groundwater recharge rate in China for last 700 years

Could this be why climate models do rainfall with all the competence of tea-leaf-reading? Tiwari et al report that as much as 47% of the recharge rates of ground water in China are controlled by the sun. Apparently climate models miss the minor factor of the major cycles.

Try this radical idea on: imagine a world where climate models worked. Not only could the BoM warn people that there would be a drought coming, they could name the region, and the years.

Tiwari et al:

Here for the purpose of comparison of long term ground water recharge rates with long term solar activity, we used the 10-year average sunspot time series, for the period 1300 to 1905 AD, published by Solanki et al., [2004]. Also the additional average annual sunspot number time series (1700 to 2000 AD) is used from data source Solar Influences Data Analysis Centre. In addition to decadal data annual sunspot number data from 1700 to 2000 AD downloaded from Solar Influences Data Analysis Centre is used in the present study. The cross-correlation coefficient (+0.63) between the groundwater recharge rate time series and decadal sunspot number [Solanki et al., 2004] shows that there is statistically significant solar [...]

Has North Victoria cooled, and is that the ghost of a solar cycle signal we see?

UPDATED AGAIN #4 — Now with Vukcevics Hale cycle graph of Echuca.  and #3  David Archibalds suggestion of the Hale Cycle at work. #2 with Willis Eschenbach’s graph and my thoughts, (see below)

Ian Bryce sent me a striking graph (or two). Looking at the original raw data from Echuca Victoria shows a dramatic cooling trend of nearly half a degree since 1900, and rather than being a siting anomaly, it’s repeated in two towns about 100km away.

Curiously he also finds peaks in the maximums at Echuca that look for all the world like they match the solar cycle. Is it a fluke, or could it be real?  If it’s real, what conditions make the solar sun-spot cycle so apparent in Echuca — where its maximum temperatures seemingly peak with each second solar cycle. Can anyone find this signal in other places? — Jo

 

The area is inland Northern Victoria

Has there been Global Warming or Global Cooling in Echuca

Guest post: Ian Bryce

I have spent about 37 years working with processing tomatoes in the Goulburn Valley in Australia, and the last 25 years or so, with research into growing and processing canning tomatoes. Since 1984, our [...]

Global cooling coming? Archibald uses solar and surface data to predict 4.9°C fall (!)

David Archibald, polymath, makes a bold prediction that temperatures are about to dive sharply (in the decadal sense). He took the  forgotten correlation that as solar cycles lengthen and weaken, the world gets cooler. He refined it into a predictive tool, tested it and published in 2007. His paper has been expanded on recently by Prof Solheim in Norway, who predicts a 1.5°C drop in Central Norway over the next ten years.

Our knowledge of they solar dynamo is improving, and David adds the predicted solar activity ’til 2040 to the analysis. Normal solar cycles are 11 years long, but the current one (cycle 24) is shaping up to be 17 years (unusually long), and using historical data from the US, David predicts  a 2.1°C decline over Solar Cycle 24 followed by a further 2.8°C over Solar Cycle 25. That adds up to a whopping 4.9°C fall in temperate latitudes over the next 20 years. We can only hope he’s wrong. As David says ” The center of the Corn Belt, now in Iowa, will move south to Kansas.”

He also predicts continuing drought in Africa for another 14 years, with droughts likely in South America too.

If he’s right, [...]

Major Drop in Solar Activity Predicted: Little Ice Age, part II?

Ominously, the embryonic markers of solar cycle 25 are three years late and are nowhere to be seen. Scientists are asking if this could be the start of another  Maunder-type Minimum. (The bummer with that, being that during those 70 quiet years the world slipped into the Little Ice Age; animals froze in barns, people starved, disease raged… see The brutal cold of the Maunder Minimum and the Great Irish Frost for some light entertainment.)

If it were going to happen, we ought to start preparing now, right? You know, take precautions, “buy insurance”, figure out if CO2 actually does any useful warming (and if so, pump more of it into our atmosphere). You know it makes sense…

Seriously, if the cold is coming, we really ought to pay attention. — Jo

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From the press release today (June 14):

Major Drop in Solar Activity Predicted

“This is highly unusual and unexpected,” Dr. Frank Hill, associate director of the NSO’s Solar Synoptic Network, said of the results. “But the fact that three completely different views of the Sun point in the same direction is a powerful indicator that the sunspot cycle may be going into hibernation.”

Normally cycles [...]

The SOI still rules

Who would have thought that if you knew the air pressure in Darwin and Tahiti in June, you could figure out that the start of 2011 might be a Stalingrad Winter up North and a cooler wetter summer down south (Not that people in Sydney feel all that cool right now). But the air pressure ratios are reported as the SOI (Southern Oscillation Index) and it’s the handiest thing if you like predicting global temperatures 7 months ahead. Look at that correlation.

Since June last year Bryan Leyland has been using the simple connection described by Carter, De Freitas, and  McLean in 2009 to predict up and coming temperatures.

So far, for what it’s worth, he’s right on track.

Such is the power of the stored pool of cold that is the bottom three-quarters of the Pacific Ocean. And when you look at how vast the Southern Pacific ocean is, is it any wonder it has such an influence? All that heat capacity…

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