Skip to comments.How Earth's orbital shift shaped the Sahara
Posted on 12/21/2010 10:03:52 AM PST by LucyT
The Sahara, the world's largest desert, was once fertile grassland. This fact has been common knowledge in the scientific community for some time, but scientists are still grappling with historic data to determine whether that transition took place abruptly or gradually.
At the European Geosciences Union General Assembly held in Vienna, Austria earlier this year, researchers presented new evidence showing that the eastern region of the Sahara desert, particularly the area near Lake Yoa in Chad, dried up slowly and progressively since the mid-Holocene period.
(Excerpt) Read more at physorg.com ...
Owl gore says different.
I ran across another idea once that at one time North America and South America were separated by a strait through which a large ocean current flowed.
When Central America rose, cutting off the current, the climate of Africa changed.
According to that particular article, the African climate change was what led to the evolutionary rise of homo sapiens.
This relates to the archaelogy work conducted at the dry lake west of the nile by a few hundred kilometers. The links below are from different historical eras.
Sunkenciv pinged a thread discussing that lake recently.
Shuttle images reveal Egypt’s lost great lake
· 12/03/2010 4:09:49 AM PST ·
· Posted by SunkenCiv ·
· 26 replies ·
· Science News ·
· Wednesday, November 24th, 2010 ·
· Alexandra Witze ·
Radar images taken from the space shuttle confirm that a lake broader than Lake Erie once sprawled a few hundred kilometers west of the Nile, researchers report in the December issue of Geology. Since the lake first appeared around 250,000 years ago, it would have ballooned and shrunk until finally petering out around 80,000 years ago... Since then, desert winds have eroded and sands have buried much of the region’s landscape, says Maxine Kleindienst, an anthropologist at the University of Toronto. But during next summer’s field season, she and her colleagues will be checking for ancient shorelines at the elevations...
The Lost City: A discovery in the desert could rewrite the history of ancient Egypt
Yale Alumni Magazine ^ | September/October 2010 | Heather Pringle
It was all those ancient Israelites and their SUVs. They parked them all close together and shifted the Earth’s orbit.
Ah the money quote:
‘For a long time, the belief was that the Earth’s tilt would change only insignificantly in the next century. However, recent research is suggesting that the effects of global warmingparticularly the oceanscould cause a change in the Earth’s axial tilt. Scientists from NASA’s Jet Propulsion Laboratory say that the current melting of ice in Greenland is already causing the tilt to change at a rate of approximately 2.6 centimeters each year. They predict that his change could increase in the years ahead.’
Uh huh. Now global warming is causing tilt shifts in the earth.
Oh, but did you get to the punchline in the article?? The one that says that Global Warming and the rising oceans are actually going to CAUSE the earth’s axis to tilt, leading to MORE global warming? Face-palm.
Read Velikovski -'Worlds in Collision'. Now largely discredited but very interesting reading, and you never know, maybe he was on to something.
Obviously, they haven't heard of George W. Bush.
>>A change in the Earths orbit, many scientists believe, transformed the Green Sahara into what is now the largest desert on the planet.<<
No way! We all know it was the smoke from Cromagnon camp fires.
Did you ever see a top spinning around and suddenly it gives a big twitch then stabilizes again for a short time...
i think that ‘twitch’ would be quite a shcok if it happened to the spinning earth.
It would also explain a lot of things- like why we find landmarks 100 feet underwater that used to be cities, and sea life fossils on mountain tops
It’s almost like a ‘dry band’ that goes around much of the Earth. You can look at the Sahara on a global map, and nearly all the way around the planet, there is desert, across the Middle East, all the way around to the South Western US/Mexico. It varies some, but you can definitely see the pattern.
Second rate, second hand alarmism.
The article actually describes a difference in the phasing between perihelion and vernal equinox and changes in the tilt or obliquity of the earth’s rotational axis, which are all part of the familar Milankovitch Theory.
The article did talk about a 2.6 cm/year change in the earth’s tilt caused by melting of Greenland’s ice cap. This would produce a change in tilt of 0.000023 degrees per century. Compared to the 0.01 degrees per century due to astronomical torques, it’s in the friggin’ noise.
Saharan Shape Shifter
“Now global warming is causing tilt shifts in the earth.”
Well, that nullifies sceptics- deniers- who use Milankovitch periodic axial tilt to debunk Global Warming, or Global Cooling, or Global Catastrophic Climate Change or whatever today’s flavor of global socialism is.
Take your lefty lies somewhere else!
No one else wants them.
Man what an idea you’ve given me! The ultimate cure for global climate change in a “natural way”.
Here is what we can do. We’ll take all the nucs that dumbo has retired and we’ll make whole bunch of cratering charges. Then we’ll take them down to Central America and open the isthmus. We’ll space the charges so that the newly created current will erode the remaining earth thus maximizing the benefit of the nucs. The Pacific Current will be captured and we’ll have velocity jump induced waves in the new Straight of Central America. There will be more-or-less permanent standing waves and the surfing will be outstanding!
El Nino will be broken, the Sahara will become green, we won’t have to hear about feeding Africa. The new circumequitorial current will spread prosperity throughout the globe and peace and prosperity will prevail.
This will work so well others will want to take our lead and complete the project. Israel will be in the way but excavation could go either north or south for those who don’t want to destroy the Holy Land. Only part of Egypt and Yemen would have to be obliterated. Alternately, Syria, Lebanon, part of Iraq and Kuwait could be excavated and the project completed in the straights of Hormuz by removing part of Oman and Yemen. Oil production may be reduced but the hydroelectric power potential would be extraordinary!
Panama, Nicaragua and Costa Rica may have problems with this plan but they could be relocated to the newly arable land in North Africa! It’ll be just magnificent!!!
Please: NO profanity, NO personal attacks, NO racism or violence in posts.
Having trouble reading today, newbie ? There are other ways to say you don't like what was posted. Like refuting it with facts, etc.
Glacier Girl was recovered from beneath 270 feet of ice on the Greenland ice sheet: http://en.wikipedia.org/wiki/Glacier_girl . The aircraft did not bore into it to get there. It landed and was abandoned in 1942 and recovered 50 years later in 1992. 270 feet of ice were deposited in those short 50 years and NASA is telling me that the ice is melting? Drain that swamp.
The HistoriesThus from Egypt as far as Lake Tritonis Libya is inhabited by wandering tribes, whose drink is milk and their food the flesh of animals. Cow's flesh, however, none of these tribes ever taste, but abstain from it for the same reason as the Egyptians, neither do they any of them breed swine. Even at Cyrene, the women think it wrong to eat the flesh of the cow, honouring in this Isis, the Egyptian goddess, whom they worship both with fasts and festivals. The Barcaean women abstain, not from cow's flesh only, but also from the flesh of swine.
Book IV -- Melpomene
tr by George Rawlinson
West of Lake Tritonis the Libyans are no longer wanderers, nor do they practise the same customs as the wandering people, or treat their children in the same way. For the wandering Libyans, many of them at any rate, if not all -- concerning which I cannot speak with certainty -- when their children come to the age of four years, burn the veins at the top of their heads with a flock from the fleece of a sheep: others burn the veins about the temples. This they do to prevent them from being plagued in their after lives by a flow of rheum from the head; and such they declare is the reason why they are so much more healthy than other men. Certainly the Libyans are the healthiest men that I know; but whether this is what makes them so, or not, I cannot positively say -- the healthiest certainly they are. If when the children are being burnt convulsions come on, there is a remedy of which they have made discovery. It is to sprinkle goat's water upon the child, who thus treated, is sure to recover. In all this I only repeat what is said by the Libyans.
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Illegitimi non carborundum. :’)
That makes more sense than an orbit change.
Great tag line!
no its not
one cannot get much more unattractive than that.
C’mon, we all know it was the flatulence from dinosaur stockyards.
What is more factual than a lyin lefty?
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