JoNova A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).
Handbooks
Advertising
The nerds have the numbers on precious metals investments on the ASX
Think it has been debunked? See here.
|
MIT researchers think they have solved a bit of a mystery regarding Sahara dust, but if they’re right it means the Sahara Desert has already come and gone 3 – 5 times since humans walked the Earth. The Sahara is the largest desert on Earth, and this would be the largest and longest drought “ever” on the planet (as far as we know).
UPDATED: Commenter Javier points out these drying cycles were known years ago. (See below)
This would rather redefine the whole idea of “climate change” — 3.5 million square miles of Green Sahara turns into Dust-bowl Sahara — and it’s all thanks to sunlight. The drought doesn’t just last 7 years, but more like 7,000. And it’s happening over 9 million square kilometers, an area larger than Australia. The major climate models leaned towards the monsoonal cycle, rather than the longer ice age one. So this theory may have resolved one of the 495 contradictions in climate models. Or not. But the bigger message here is that the sun causes climate change and on a massive scale.
h/t to Roger Tallbloke.
The Sahara is the largest dust bowl in the world, dumping 10 million trucks of dust across [...]
The Pliocene is coming to get you.
The shocking news is that the world cooled for 50 million years, then, just like that, two hundred years ago, humans stopped the cooling, and turned the global clock, or thermometer, whateveryoucallit, around. Now, unleash the disaster — by 2030 Earth is going to resemble the mid-Pliocene. So in just 11 years time, it will be like 3 million years ago. Apparently we are losing 250,000 years every year. Buy a solar panel now!
You think I’m joking:
Humans may be reversing the climate clock, by 50 million years
Our future on Earth may also be our past.
In a study published Monday (Dec. 10, 2018) in the Proceedings of the National Academy of Sciences, researchers show that humans are reversing a long-term cooling trend tracing back at least 50 million years. And it’s taken just two centuries.
By 2030, Earth’s climate is expected to resemble that of the mid-Pliocene, going back more than 3 million years in geologic time.
How bad was the Pliocene?
In the Pliocene, North and South America joined tectonically, the climate was arid, land bridges allowed animals to spread across continents [...]
Gotta love a long unbroken proxy.
Scientists looked at 44 pines sites across the Scottish Highlands and used their tree rings to create a continuous temperature series for the last 810 years. Showing admirable restraint, they did not paste on adjusted thermometer records to create a hockey stick effect. Instead we can see that Scottish summers were just as warm in the 1300s, the 1280s and around 1500 as well.
The rate of warming is not unprecedented. The temperature is not unusual. But thermometers don’t tell the same story as the tree rings in the last 50 years. They both can’t be right. Either the tree rings are always unreliable thermometers or the thermometers are placed near ice cream trucks and adjusted up-the-kazoo?
Thanks to CO2Science:
Rydval et al. extended “the previously published Scottish dendroclimatic record (Hughes et al., 1984) by nearly 500 years,” in order to create an 810-year-long proxy over the period AD 1200-2010. The reconstruction was derived from a network of 44 Scots pine (Pinus Sylvestris) sites across the Scottish Highlands from both living and subfossil samples that correlated well with summer (July-August) temperatures.
In placing the most recent warming of the instrumental [...]
Strap yourself down – a puzzle you never knew existed has finally been solved!
Nov 16, 2017: Scientists Solve 22 Million-Year-Old Climate Puzzle –”Paleoclimate Events Can Predict Earth’s Future”
Solved yesterday, settled today! That’s a rapid fire consensus… (they actually use the word “settled” in the title of the paper)
Study Settles prehistoric puzzle, confirms modern link of carbon dioxide and global warming
Finally poor Miocene researchers can sigh with relief as the first study in years shows what they *knew* was the right answer and now they can issue press releases, rest their weary minds, and stop trying to think of excuses as to why their results didn’t fit with The Climate Model Testaments.
Who knew there were large discrepancies and carbon dioxide did not fit the temperature theory for a million years or so? Not the public.
Where were the press releases telling us there was a mystery to solve?
Research Shows A High Temperature World Had Nothing To Do With CO2 Study shows temperatures fell dramatically, CO2 stayed the same Study shows models have no freaking clue what controls the climate
Exactly, never.
The mystery they are talking about is the one marked Mi-1, 22 [...]
There was no Medieval Warm Period in China. No little ice age either. Not warm in Roman times either.
Obviously CO2 controls this climate.
(Click to enlarge)
Quansheng et al show that weather is lumpy, that modern warming is a lot like past warming. They go so far as to say that there are regular cycles and hint that sun might have something to do with it, and volcanoes.
“…centenial variation is significantly correlated with long-term changes in solar radiation—especially cold periods, which correspond approximately to sunspot minima, as well as the frequency of large volcanic eruptions.”
They go on to say that rate of warming was about half a degree per century lately. It may have been the fastest rate, but then again, it may not. It was hard to tell with the error bars being so wide. It was all done with proxies and has a ten year resolution. Obviously it is in need of having homogenadjustoided thermometer data added after 1960 as is the custom in climate science.
The Medieval Warm Period was global Medieval Warm Period found in 120 proxies. Plus Roman era was similar to early 20th Century. Sun controls half of the groundwater recharge [...]
Don’t tell me that cold is nice and the climate was ever ideal
A few scientists thought that the climate was stable and well behaved during the Holocene until we invented coal power and the Ford Model T and everything fell apart “unprecedentedly”.
But 8200 years ago things apparently got pretty wild. See the GISP graph below where there was a three degree fall in temperatures suddenly (circled in red below). A new study found that at the same time China and California also cooled. Strangely, this cooling effect probably did not produce calm, happy days for the Californians at the time. Instead it looks like they got 150 years of intense winter storms and a lot of wet weather.
UPDATE: This graph shows the ice-core data up until 1855. The last 150 years (1705 to 1855) are highlighted in red to show the warming as the Earth began coming out of the LIA. Obviously that red line would continue up further if it was drawn to the present.
Looks like real climate change….
The reason for the sudden snap is possibly that a couple of massive glacial lakes in North East America collapsed and suddenly drained out [...]
Now this is climate change. If you can believe this study, wow:
“In the tropics, annual mean temperature fell from 27 to 5 degrees Celsius”
And we worry about a warming of one degree in a century.
“It became cold, I mean, really cold,” says Brugger. Global annual mean surface air temperature dropped by at least 26 degrees Celsius. The dinosaurs were used to living in a lush climate. After the asteroid’s impact, the annual average temperature was below freezing point for about 3 years. Evidently, the ice caps expanded. Even in the tropics, annual mean temperatures went from 27 degrees to mere 5 degrees. “The long-term cooling caused by the sulfate aerosols was much more important for the mass extinction than the dust that stays in the atmosphere for only a relatively short time. It was also more important than local events like the extreme heat close to the impact, wildfires or tsunamis,” says co-author Georg Feulner who leads the research team at PIK. It took the climate about 30 years to recover, the scientists found.
The real threats are not fertilizer and balmy weather, but rocks from space, and cold, cold, cold…
How the [...]
There have been suggestions that Jo Nova might be trying to hide or ignore the most recent boreholes graph from Huang et al. So here it is. This is the last 2,000 years according to 6000 boreholes, with the last 100 years also using the “instrumental record” which gives us that hockey-stick uptick at the end. Below I explain the pros and cons of this study and update my thoughts.
Huang and Pollack 2008: Their latest boreholes published study
A borehole sounds like a bit-of-a-stretch as a proxy. How could we tell if the world was warmer in 1066 by drilling a hole in the ground? Yes, fair point. But what makes boreholes useful is that they are global and there is a lot of data: specifically 6,000 holes all over the world.
I’ve been looking at boreholes in more detail, analyzing them in the light of newer proxies. When all the evidence is considered, boreholes turn out be not-much-use at giving us meaningful numbers in degrees C, and in my opinion, not-too-hot at telling us the “when” of an event either. Too much depends on assumptions.
But what are they good for is that, when combined with [...]
|
Jo appreciates your support to help her keep doing what she does. This blog is funded by donations. Thanks!
Follow Jo's Tweets
Recent Posts
... has moved. Check the top of the left column. To report "lost" comments or defamatory and offensive remarks, email the moderators at: support AT joannenova.com.au
Statistics 21 contributors have published
3409 posts that generated
542690 comments
|
Recent Comments