Skip to comments.Cosmic Rays, Solar Activity Have Much Greater Impact On Earth’s Climate Than Models Suggest
Posted on 12/25/2017 8:59:19 AM PST by pa_dweller
Lead author, Henrik Svensmark, from The Technical University of Denmark has long held that climate models had greatly underestimated the impact of solar activity.
He says the new research identified the feedback mechanism through which the suns impact on climate was varied.
Professor Svensmarks theories on solar impact have caused a great deal of controversy within the climate science community and the latest findings are sure to provoke new outrage.
He does not dispute that increased levels of carbon dioxide in the atmosphere have a warming impact on the climate.
But his findings present a challenge to estimates of how sensitive the climate is to changes in carbon dioxide levels in the atmosphere.
Professor Svensmark says his latest findings were consistent both with the strong rise in the rate of global temperature change late last century and a slowdown in the rate of increase over the past 20 years.
It gives a physical foundation to the large body of empirical evidence showing that solar activity is reflected in variations in Earths climate, a media statement accompanying the scientific report said.
For example, the Medieval Warm Period around year 1000AD and the cold period in the Little Ice Age 1300-1900 AD both fits changes in solar activity, it said.
Finally we have the last piece of the puzzle of why the particles from space are important for climate on Earth, it said.
The study reveals how atmospheric ions, produced by the energetic cosmic rays raining down through the atmosphere, helps the growth and formation of cloud condensation nuclei the seeds necessary for forming clouds in the atmosphere.
More cloud condensation nuclei mean more clouds and a colder climate, and vice versa.
Since clouds are essential for the solar energy reaching the surface of the Earth the implications are huge for our understanding of why climate has varied in the past and also for a future climate changes, the statement said.
Professor Svensmark said it had until now wrongly been assumed that small additional nucleated aerosols would not grow and become cloud condensation nuclei, since no mechanism was known to achieve this.
The research team tested its ideas experimentally in a large cloud chamber.
Data was taken over a period of two years with total 3100 hours of data sampling.
Professor Svensmark said the new results gave a physical foundation to the large body of empirical evidence showing that Solar activity is reflected in variations in Earths climate.
This new work gives credit to a mechanism that is much stronger than changes in solar irradiance alone, Svensmark told The Australian.
Solar irradiance has been the only solar forcing that has been included in climate models and such results show that the effect on climate is too small to be of importance, he said.
The new thing is that there exists an amplification mechanism that is operating on clouds in the atmosphere, Svensmark said.
Quantifying the impact of solar activity on climate from observations is found to be 5-7 times larger than from solar irradiance, and agrees with empirical variations in cosmic rays and clouds, he said.
This can therefore also explain why climate over the last 10,000 years correlates with solar activity, Svensmark said.
On time scales of millions of years there are much larger changes in the cosmic rays that has nothing to do with solar activity, he said.
So, this is an independent test of the mechanism and even here beautiful correlations are found, he said.
But the Nature Communications paper says the theory of ion-induced condensation should be incorporated into global aerosol models, to fully test the atmospheric implications.
Professor Svensmark said since solar activity increased in the 20th century, part of the observed warming is caused by the sun.
The logical consequence is that the climate sensitivity of CO2 is smaller than what climate models suggest which is 2-4 deg C for each doubling of CO2, since both CO2 and solar activity has had an impact, he said.
More at link.
Well duh. Weve been saying that for years
Sun spot cycles impact us greatly
>>It’s not you, it’s the sun. Fire up that CO2 machine and take a drive in the snow!
I too am quite relieved to find that Science! has begun to realize that the sun heats the earth.
The Sun impact's Earth's Climate? Who woulda thunk it?
Certainly not Rats, RINOs or Globalist Nazis!
GASP! That huge ball of fire in the sky affects the climate? Who could have guessed that?
Shoots man caused Global Climate change all to H**k!
A real scientist is not "outraged" at new findings.
Alien Global Warming
I used my best tin foil hat on today’s turkey!
Will I suffer additional brain damage?
Odd that is comes to this, isn't it?
Well, there's the problem right there. What in the world do Christie Brinkley, Cindy Crawford and Kathy Ireland know about the climate?
it’s been well known for at least a half a century that the ~11 year solar minimum/maximum cycle has more profound effects on short-term climate variation than any other factor. Of course, the global-warming fake “science” community and the fake stream media have done everything in their power to bury that little factoid and pretend like it doesn’t exist.
The article leaves out an important part of cosmic rays. The radiation comes from both the sun and from outside the solar system, especially the high energy cosmic rays which are likely due to radiation escaping from black holes.
No, not just part, but a great majority! It is not just the Sun's warming rays bathing the Earth that warms us. The Sun and its planets form an electrical machine. The Sun directly influences our magnetic poles and the emanations of magnetic charges flowing through our planet in various locations, not just the poles. These interactions with the Sun directly influence our weather.
Throughout our history, changes in weather here on Earth mirror changes of temperatures on our neighboring planets. Are increased levels of CO2 on Earth responsible for warming of Mars and Venus? No, they're not. Increased levels of CO2 are an after-effect of warming on Earth, not a cause. And the levels of CO2 are so miniscule (a tiny fraction of a percent) as compared to other gases in the atmosphere, that CO2 is not to even be considered as a threat to weather. Reduce CO2, and you endanger plant life on Earth.
Well yeah, like 25 years at least. Possibly longer, but I can’t remember any further back.
Even more reason why Donald Trump should be impeached.