Archive for the ‘Science’ Category

Elephant personalities revealed by scientists

Posted: November 1, 2012 by phaedrap1 in News, Science
Elephants have four distinct personalities that help their herd survive in the African bush, scientists have found.

African elephant and calf: Researchers found that some elephants had more gentle personalities

Researchers found that some elephants had more gentle personalities Photo: Burrard-Lucas / Barcroft Media

 With their grey skin, mournful eyes and slow plodding gait, you could be forgiven for thinking elephants are uniformly melancholy creatures.

But scientists have now discovered the largest living land animals have personalities to match their size.

In a new study of African elephants, researchers have identified four distinct characters that are prevalent with a herd – the leaders, the gentle giants, the playful rogues and the reliable plodders.

Each of the types has developed to help the giant mammals survive in their harsh environment and are almost unique in the animal kingdom, according to the scientists.

“Each individual in a group has a very different personality type,” said Professor Phyllis Lee, a behavioural psychologist at University of Stirling and chair of the scientific advisory committee for the Amboseli Trust for Elephants.

“It is the ability to influence others and sustain friendships are important to an elephant group, while in other animals it is often aggression or dominance.”

Professor Lee and her colleague Cynthia Moss studied a herd of elephants in the Amboseli National Park in Kenya known as the EB family – famous for their matriarch Echo before she died in 2009.

Using data collected over 38 years of watching this group, the researchers analysed them for 26 types of behaviour and found four personality traits tended to come to the fore.

The strongest personality to emerge was that of the leader. The researchers, whose work is published in the Journal of Comparative Psychology, looked for those elephants that tended to influence the movements and direction of the group.

They also looked for the elephants that produced the most deep calls known as “let’s go” rumbles, which the animals use when started to move as a herd.

Unlike other animals, where leadership tends to be won by the most dominant and aggressive individual, the elephants instead respected intelligence and problem solving in their leader.

Professor Lee said: “This is something that is particularly unusual in animals. Normally dominance is the main element in leadership in dogs, macaques, chimpanzees and many more. What we find in elephants is it more about their ability to get agreement.

“Leadership is not equal to power or assertion in elephants, but illustrates the respect accorded to individuals as a function of their problem-solving ability and their social permissiveness.”

Echo, the matriarch and oldest in the group, her daughter Enid, and Ella, the second oldest female, all emerged as leaders.

The playful elephants tended to be younger but were more curious and active. Eudora, a 40-year-old female in the herd, seemed to be the most playful, consistently showing this trait through out her life while playfulness in some of the other elephants declined with age.

Gentle elephants, which included two 27-year-old females Eleanor and Eliot, caressed and rubbed against others more than the others.

Those that were reliable tended to be those that were most consistent at making good decisions, helped to care for infants in the herd and were calm when faced with threats. Echo and her youngest daughter Ebony seemed to be the most reliable.

Professor Lee said that elephants with these traits tended to be the most socially integrated in the group while those who tended to be less reliable and pushy were more likely to split from the herd.

She said that less integrated elephants also tended to produce fewer calves, suggesting that personality could determine reproductive success.

The researchers now hope to study other elephant groups and male elephants to see if any other personality characteristics emerge.

Professor Lee said: “We have only looked at one elephant group so we intend to look at other elephant groups that are less successful to see if there are other personalities that are causing this. We really don’t know much about the personality types in males yet either.

“Males develop strong friendships and older males tend to mentor younger ones, who follow them and learn from them.”

 

The Telegraph

Tsunamis in the Alps?

Posted: November 1, 2012 by phaedrap1 in News, Science, Uncategorized
Tags:

A killer wave slammed medieval Geneva, a new study says. And it could happen again.

Chateau de Chillon on Lake Geneva, Switzerland.

The circa A.D. 1000 Chateau de Chillon on Lake Geneva, Switzerland.

Photograph from ADS/Alamy

Daniel Stone

National Geographic News

Published October 31, 2012

Nearly 1,500 years ago a massive flood in Geneva reportedly swept away everything in its pathmills, houses, cattle, even entire churches.

Now researchers believe they’ve found the unlikely sounding culprit: a tsunami-like killer wave in the Alps. The threat, they add, may still be very much alive.  

Spurred by a huge landslide, the medieval Lake Geneva “tsunami” (technically defined as a seismic ocean wave) swamped the city, which was already a trading hub, according to a new study.

Far from any ocean, the massive wave was likely generated by a massive landslide into the Rhône River, which feeds and flows through Lake Geneva, according to a group of Swiss researchers.

The team analyzed a massive sediment deposit at the bottom of the lake’s easternmost corner and determined that the material had once sat above the lake and had slid all at once into the Rhône, near where the river flows into the eastern end of Lake Geneva (map).

The sudden splash sent a tsunami barreling down the length of the 225-square-mile (580-square-kilometer) lake toward Geneva, at the western end of the lake, the study suggests. Researchers estimate the wave was between 9 and 26 feet (3 and 8 meters) tall, depending on how quickly the rockfall occurred, which they were unable to measure.

(From National Geographic magazine: Where and when will the next tsunami hit?)

Geneva in the Crosshairs

The Alpine tsunami, the researchers caution, isn’t just a thing of the past.

A similar event at Lake Geneva could affect the modern-day Swiss cities of Lausanne, Nyon, and Thonon-les-Bains—but Geneva itself may be at greatest risk.

The city is home to major financial and international organizations as well as nearly 200,000 people, many of whom live in low-lying areas near the lake. Unfortunately for them, the lake narrows as it approaches Geneva, creating a funnel effect that would amplify an approaching wave.

For now, there’s little indication that another Geneva tsunami is imminent, researchers have said. But the new study found evidence of several large flooding events in Geneva since the last glacier retreated from the city’s site.

“If this has happened five to six times since the last glaciation, there’s reason to believe it could happen again in the future,” said University of Geneva geologist Guy Simpson, who study team’s modeler.

“A three-meter [ten-foot] wave that hit Geneva today would be a scary wave.”

The Geneva-tsunami study appears this week in the journal Nature Geoscience.

Conserve Your Willpower: It Runs Out

Posted: October 30, 2012 by phaedrap1 in News, Science

Photo: Getty

Ever wonder why your resolve to hit the gym weakens after you’ve slogged through a soul-sapping day at work? It’s because willpower isn’t just some storybook concept; it’s a measurable form of mental energy that runs out as you use it, much like the gas in your car.

Roy Baumeister, a psychologist at Florida State University, calls this “ego depletion,” and he proved its existence by sitting students next to a plate of fresh-baked chocolate-chip cookies. Some were allowed to snack away, others ordered to abstain. Afterward, both groups were asked to complete difficult puzzles. The students who’d been forced to resist the cookies had so depleted their reserves of self-control that when faced with this new task, they quickly threw in the towel. The cookie eaters, on the other hand, had conserved their willpower and worked on the puzzles longer.

Further studies have suggested that willpower is fueled by glucose—which helps explain why our determination crumbles when we try to lose weight. When we don’t eat, our glucose drops, and our willpower along with it. “We call it the dieter’s catch-22: In order to not eat, you need willpower. But in order to have willpower you need to eat,” says John Tierney, coauthor with Baumeister of Willpower: Rediscovering the Greatest Human Strength.

But there are ways to wield what scientists know about willpower to our advantage. Since it’s a finite resource, don’t spread yourself thin: Make one resolution rather than many. And if you manage to stick with it by, say, not smoking for a week, give your willpower a rest by indulging in a nice dinner. Another tactic is to outsource self-control. Get a gym buddy. Use Mint.com to regulate your spending or RescueTime.com to avoid distracting websites. As Tierney explains, “People with the best self-control aren’t the ones who use it all day long. They’re people who structure their lives so they conserve it.” That way, you’ll be able to stockpile vast reserves for when you really need it, like hauling your lazy ass to the gym.

 

By Judy Dutton

Jade vulture.

A jade pendant of a vulture discovered at the Maya site of Tak’alik Ab’aj. (Tak’alik Ab’aj Archaeological Project / Associated Press / October 29, 2012)

By Thomas H. Maugh II Los Angeles TimesOctober 29, 2012, 11:27 a.m.

Guatemalan archaeologists have found the tomb of what may have been one of the Maya’s earliest rulers and perhaps its most influential. King K’utz Chman introduced many cultural features that eventually defined the Maya, including building pyramids instead of square structures and commissioning the production of carved sculptures that depicted the royal family. His grave is the most ancient royal Maya burial to be found and it contains a variety of carved jade objects indicating his wealth and status.

“He was the big chief,” archaeologist Miguel Orrego of the Guatemalan Instituto de Antropologia e Historia told Reuters. Chman was “the ruler who bridged the gap between Olmec and Maya cultures and initiated the slow transition to Maya rule.”

The tomb was found in June at the  site of Tak’alik Ab’aj, a large city in the Retalhuleu department of southwestern Guatemala, about 110 miles south of Guatemala City. Tak’alik Ab’aj is the Maya name, meaning “Standing Stone,” given to the site by scientists. Its ancient name may have been Kooja, meaning “Moon Halo.” The city flourished from about the 9th century BC through at least the 10th century and its residents traded heavily with other cities, some as far away as Teotihuacan in Mexico. It is one of the largest Maya sites along the Pacific Coast.

The newly discovered tomb contains no human bones, but carbon-dating of other organic materials indicates that it was constructed sometime between 770 and 510 BC. The Maya empire began to thrive around 400 BC as the Olmec empire faded.

Inside the tomb, the team found a variety of jade objects, including a necklace with a pendant carved in the shape of a vulture’s head. Such objects were generally the property of very powerful men and a symbol of great respect. Because of the necklace, the team named the king K’utz Chman, which translates roughly as “Grandfather Vulture.”

Other objects in the tomb included ceramic pots, ceramic dolls and jade beans.

“The richness of the artifacts tells us he was an important and powerful religious leader,” said archaeologist Christa Schieber of the institute. “He was very likely the person who began to make changes in the system and transition into the Maya world.”

  • Ground-breaking theory holds that quantum substances form the soul
  • They are part of the fundamental structure of the universe

A near-death experience happens when quantum substances which form the soul leave the nervous system and enter the universe at large, according to a remarkable theory proposed by two eminent scientists.

According to this idea, consciousness is a program for a quantum computer in the brain which can persist in the universe even after death, explaining the perceptions of those who have near-death experiences.

Dr Stuart Hameroff, Professor Emeritus at the Departments of Anesthesiology and Psychology and the Director of the Centre of Consciousness Studies at the University of Arizona, has advanced the quasi-religious theory.

It is based on a quantum theory of consciousness he and British physicist Sir Roger Penrose have developed which holds that the essence of our soul is contained inside structures called microtubules within brain cells.

They have argued that our experience of consciousness is the result of quantum gravity effects in these microtubules, a theory which they dubbed orchestrated objective reduction (Orch-OR).

Thus it is held that our souls are more than the interaction of neurons in the brain. They are in fact constructed from the very fabric of the universe – and may have existed since the beginning of time.

The concept is similar to the Buddhist and Hindu belief that consciousness is an integral part of the universe – and indeed that it is really all there may be, a position similar to Western philosophical idealism.

With these beliefs, Dr Hameroff holds that in a near-death experience the microtubules lose their quantum state, but the information within them is not destroyed. Instead it merely leaves the body and returns to the cosmos.

Shocked back to life: The theory holds that when patients have a near death experience their quantum soul is released from the body and re-enters the cosmos, before returning when they are revivedShocked back to life: The theory holds that when patients have a near death experience their quantum soul is released from the body and re-enters the cosmos, before returning when they are revived

Dr Hameroff told the Science Channel’s Through the Wormhole documentary: ‘Let’s say the heart stops beating, the blood stops flowing, the microtubules lose their quantum state.

‘The quantum information within the microtubules is not destroyed, it can’t be destroyed, it just distributes and dissipates to the universe at large.

‘If the patient is resuscitated, revived, this quantum information can go back into the microtubules and the patient says “I had a near death experience”.’

He adds: ‘If they’re not revived, and the patient dies, it’s possible that this quantum information can exist outside the body, perhaps indefinitely, as a soul.’

Evidence: Dr Hameroff believes new findings about the role quantum physics plays in biological processes, such as the navigation of birds, will one day prove his theoryEvidence: Dr Hameroff believes new findings about the role quantum physics plays in biological processes, such as the navigation of birds, will one day prove his theory

The Orch-OR theory has come in for heavy criticism by more empirically minded thinkers and remains controversial among the scientific community.

MIT physicist Max Tegmark is just one of the many scientists to have challenged it, in a 2000 paper that is widely cited by opponents, the Huffington Post reports.

Nevertheless, Dr Hameroff believes that research in to quantum physics is beginning to validate Orch-Or, with quantum effects recently being shown to support many important biological processes, such as smell, bird navigation and photosynthesis.

 By:  Damien Gayle
MailOnline

Paintballs may deflect an incoming asteroid

Posted: October 28, 2012 by phaedrap1 in News, Science
Tags: ,
Paintballs may deflect an incoming asteroid
An artist’s rendering of the asteroid Apophis.
Image: European Space Agency
October 26, 2012

With 20 years’ notice, paint pellets could cause an asteroid to veer off course.

In the event that a giant asteroid is headed toward Earth, you’d better hope that it’s blindingly white. A pale asteroid would reflect sunlight — and over time, this bouncing of photons off its surface could create enough of a force to push the asteroid off its course.

How might one encourage such a deflection? The answer, according to an MIT graduate student: with a volley or two of space-launched paintballs.

Sung Wook Paek, a graduate student in MIT’s Department of Aeronautics and Astronautics, says if timed just right, pellets full of paint powder, launched in two rounds from a spacecraft at relatively close distance, would cover the front and back of an asteroid, more than doubling its reflectivity, or albedo. The initial force from the pellets would bump an asteroid off course; over time, the sun’s photons would deflect the asteroid even more.

Paek’s paper detailing this unconventional strategy won the 2012 Move an Asteroid Technical Paper Competition, sponsored by the United Nations’ Space Generation Advisory Council, which solicits creative solutions to space-related problems from students and young professionals. Paek presented his paper this month at the International Astronautical Congress in Naples, Italy.

The challenge put forth by this year’s U.N. competition was to identify novel solutions for safely deflecting a near-Earth object, such as an asteroid. Scientists have proposed a wide variety of methods to avoid an asteroid collision. Some proposals launch a projectile or spacecraft to collide with an incoming asteroid; the European Space Agency is currently investigating such a mission.

Other methods have included detonating a nuclear bomb near an asteroid or equipping spacecraft as “gravity tractors,” using a craft’s gravitational field to pull an asteroid off its path.

Paek’s paintball strategy builds on a solution submitted by last year’s competition winner, who proposed deflecting an asteroid with a cloud of solid pellets. Paek came up with a similar proposal, adding paint to the pellets to take advantage of solar radiation pressure — the force exerted on objects by the sun’s photons. Researchers have observed that pressure from sunlight can alter the orbits of geosynchronous satellites, while others have proposed equipping spacecraft with sails to catch solar radiation, much like a sailboat catches wind.

In his proposal, Paek used the asteroid Apophis as a theoretical test case. According to astronomical observations, this 27-gigaton rock may come close to Earth in 2029, and then again in 2036. Paek determined that five tons of paint would be required to cover the massive asteroid, which has a diameter of 1,480 feet. He used the asteroid’s period of rotation to determine the timing of pellets, launching a first round to cover the front of the asteroid, and firing a second round once the asteroid’s backside is exposed. As the pellets hit the asteroid’s surface, they would burst apart, splattering the space rock with a fine, five-micrometer-layer of paint.

From his calculations, Paek estimates that it would take up to 20 years for the cumulative effect of solar radiation pressure to successfully pull the asteroid off its Earthbound trajectory. He says launching pellets with traditional rockets may not be an ideal option, as the violent takeoff may rupture the payload. Instead, he envisions paintballs may be made in space, in ports such as the International Space Station, where a spacecraft could then pick up a couple of rounds of pellets to deliver to the asteroid.

Paek adds that paint isn’t the only substance that such pellets might hold. For instance, the capsules could be filled with aerosols that, when fired at an asteroid, “impart air drag on the incoming asteroid to slow it down,” Paek says. “Or you could just paint the asteroid so you can track it more easily with telescopes on Earth. So there are other uses for this method.”

Lindley Johnson, program manager for NASA’s Near Earth Objects Observation Program, says Paek’s proposal is “an innovative variation” on a method used by others to capitalize on solar radiation pressure. For example, MESSENGER, a spacecraft orbiting Mercury, is equipped with solar sails that propel the craft with solar radiation pressure, reducing the fuel needed to power it.

“It is very important that we develop and test a few deflection techniques sufficiently so that we know we have a viable ‘toolbox’ of deflection capabilities to implement when we inevitably discover an asteroid on an impact trajectory,” Johnson says.

William Ailor, principal engineer for Aerospace Corp. in El Segundo, Calif., adds that the potential for an asteroid collision is a long-term challenge for scientists and engineers.

“These types of analyses are really timely because this is a problem we’ll have basically forever,” Ailor says. “It’s nice that we’re getting young people thinking about it in detail, and I really applaud that.”

Jennifer Chu, MIT News Office

The question of whether we live in a real world or a simulated one has plagued philosophers for centuries – but now scientists believe they finally have found a way to test the theory.

The Matrix

The successful film franchise, The Matrix, also helped spawn the idea that we may be living in a computer generated universe

Professor Silas Beane, a theoretical physicist at the University of Bonn in Germany said that his group of scientists have developed a way to test the ‘simulation hypothesis’.

The idea has been debated by the greats of philosophy, from Plato to Descartes, who speculated that the world we see around us could be generated by an ‘evil demon’.

The successful film franchise, The Matrix, also helped spawn the idea that what we think is our everyday life is in fact a simulation generated by an all-powerful computer.

But now more than two thousand years since Plato suggested that our senses only give us a poor reflection of objective reality, experts believe they have cracked the riddle.

Professor Beane told Radio 4’s Today programme that his proposal could be the beginning of a new period of discovery.

To identify what these constraints would be, scientists would have to build their own simulation of the universe.

They hope to see whether such an exercise would be theoretically possible – and what the constraints on the ‘evil demon’ might be.

Lattice QCD is a complex approach that that looks at how particles known as quarks and gluons relate in three dimensions.

Professor Bean said: “We consider ourselves on some level universe simulators because we calculate the interactions of particles by basically replacing space and time by a grid and putting it in a box.”

“In doing that we face lots of problems for instance the box and the grid size breaks Einstein’s special theory of relativity so we know how to fix this in order to get physical predictions that are meaningful.”

“We thought that if we make the assumption that the so-called simulators face some of the same problems that we do in terms of finite resources and so on then, if they are doing a simulation and even though their box size of course is enormous and the grid size can be very small, as long as the resources are finite then the box size will be finite, the grid size will be finite.”

“And therefore at some level for instance there would be violations of Einstein’s special theory of relativity.”

Philosophers have cautioned that there is still some way to go before we find out whether the universe is simulated. Dr Peter Millican of Hertford College, Oxford told the programme: “There are two main issues, one is whether the speculation even makes sense and the other is supposing it makes sense whether there is any good reason to think it is plausible.

“The other problem is evidence. It seems to me that the evidence that is looked for is not that convincing.”

Descartes said the evil demon that he believed controlled the universe is “as clever and deceitful as he is powerful, who has directed his entire effort to misleading me.”

But he countered that his ability to think was, at least, proof enough that he was real, writing: “I think, therefore I am.”

Plato said that reality may be no more than shadows in a cave but the cave dweller, having never left the cave, may not be aware of it.

Lucy Kinder

The Telegraph

Why Some People See Sound

Posted: October 26, 2012 by phaedrap1 in Science
illusion background
Brain anatomy may be key to explaining why some people see sound in a flash illusion.
CREDIT: Handy Widiyanto | shutterstock

Some people may actually see sounds, say researchers who found this odd ability is possible when the parts of the brain devoted to vision are small.

These findings points to a clever strategy the brain might use when vision is unreliable, investigators added.

Scientists took a closer look at the sound-induced flash illusion. When a single flash is followed by two bleeps, people sometimes also see two illusory consecutive flashes.

Past experiments revealed there are strong differences between individuals when it comes to how prone they are to this illusion. “Some would experience it almost every time a flash was accompanied by two bleeps, others would almost never see the second flash,” said researcher Benjamin de Haas, a neuroscientist at University College London.

These differences suggested to de Haas and his colleagues that maybe variations in brain anatomy were behind who saw the illusion and who did not. To find out, the researchers analyzed the brains of 29 volunteers with magnetic resonance imaging (MRI) and tested them with flashes and bleeps. [Animation of Illusion and Photos of Other Illusions]

On average, the volunteers saw the illusion 62 percent of the time, although some saw it only 2 percent of the time while others saw it 100 percent of the time. They found the smaller a person’s visual cortex was — the part of the brain linked with vision —the more likely he or she experienced the illusion.

“If we both look at the same thing, we would expect our perception to be identical,” de Haas told LiveScience. “Our results demonstrate that this not quite true in every situation — sometimes what you perceive depends on your individual brain anatomy.”

The researchers suggest this illusion could reveal a way the brain compensates for imperfect visual circuitry.

“The visual brain’s representation of what hits the eye is very efficient but not perfect — there is some uncertainty to visual representations, especially when things happen quickly, like the rapid succession of flashes in the illusion,” de Haas said. “We speculate that this kind of uncertainty is bigger in brains that dedicate a smaller proportion of neurons to visual areas, just like a camera with fewer megapixels will give you a lower image quality.”

“If this speculation holds, it would make perfect sense for smaller visual brains to make more use of the additional information provided by the ears,” de Haas explained. “In the real world, sources of light and sound are often identical, and combining them will be advantageous. Imagine you take a twilight walk in a forest and scare up some animal in the undergrowth. The best strategy for finding out whether you are dealing with a hedgehog or a bear will involve combining visual information, like moving twigs and branches, with auditory information, like cracking wood.”

Much remains unknown about the roots of this illusion. For instance, only about a quarter of the individual differences regarding the illusion could be explained by brain anatomy. “We still haven’t explained the rest,” de Haas said.

Future research can also explore “whether the relationship between visual cortex size and audiovisual perception is specific to this illusion or holds for other audiovisual illusions as well,” de Haas said.

Other such illusions include the so-called McGurk effect, when the visual component of one sound is paired with the auditory component of another sound, leading people to mysteriously perceive a third sound — for instance, when the syllables “ba-ba” are spoken over the lip movements for “ga-ga,” the perception is of “da-da.”

“Seeing feels like an objective, immediate way to access the world, but it can be shaped by so many things — hearing, individual brain anatomy, who knows what else?” de Haas said.

The scientists detailed their findings online Oct. 24 in the journal Proceedings of the Royal Society B.

Live Science

The Watchers Tweet Tweet Arctic has been experiencing a shift in the general patterns of high and low pressures recently, as well as the direction and speed of the winds. These changes may explain some of the dramatic sea ice loss experienced in the Arctic regions. Wind speed and direction are driven by differences in atmospheric pressure. Generally, air moves from areas of high to low pressure – the greater the pressure difference between two areas, the faster...

    Arctic has been experiencing a shift in the general patterns of high and low pressures recently, as well as the direction and speed of the winds. These changes may explain some of the dramatic sea ice loss experienced in the Arctic regions. Wind speed and direction are driven by differences in atmospheric pressure. Generally, air moves from areas of high to low pressure – the greater the pressure difference between two areas, the faster the air moves.

    According to a new NOAA-led study published on October 10,2012 in Geophysical Research Letters, changes in summer Arctic wind patterns contribute not only to an unprecedented loss of Arctic sea ice, but could also bring  shifts in North American and European weather. As Arctic warms at twice the global rate, scientists expect more extreme weather events like heatwaves, floodings or heavy snowfall across the temperate latitudes of the northern hemisphere, where billions of people live.

    Comparison of the atmospheric pressure (geopotential height at 700 mb) experienced during June of 2007-2012 compared to the longer term average for June from 1980-2010. Much higher pressure is found directly over the Arctic Ocean and Greenland. This difference in pressure has resulted in a change in the wind patterns. Orange arrows indicate the relative direction and strength (indicated by the arrow length) or winds during the 2007-2012 periods, whereas the white arrows are the 1980-2010 average. The most pronounced changes in winds can be seen over the Chuchki Sea, just northeast of Alaska and also east of Greenland. (NCEP Reanalysis data provided by NOAA/ESRL/PSD)

    A research team led by a NOAA research oceanographer James Overland, Ph.D., of NOAA’s Pacific Marine Environmental Laboratory in Seattle, Washington, uncovered a change in the summer Arctic wind pattern over the past six years. They point that this shift demonstrates a physical connection between reduced Arctic sea ice in the summer, loss of Greenland ice, and potentially, weather in North American and Europe.

    The team examined the wind patterns in the subarctic in the early summer between 2007 and 2012 as compared to the average for 1981 to 2010. The new study show that the previously normal west-to-east flowing upper-level winds have been replaced by a north-south undulating wave-like pattern. This new wind pattern transports warmer air into the Arctic and pushes Arctic air farther south. This may influence persistent weather conditions in the mid-latitudes. Higher pressure over the North American continent and Greenland is driving these changes in the early summer wind patterns.

    Warmer air and sea temperatures caused by global warming are rapidly changing Arctic environment but this new shift provides additional evidence that changes in the Arctic are also part of an “Arctic amplification” through which multiple specific physical processes interact to accelerate temperature change, ice variability, and ecological impacts. The effects of Arctic amplification will increase as more summer ice retreats over coming decades. Enhanced warming of the Arctic affects the jet stream by slowing its west-to-east winds and by promoting larger north-south meanders in the flow.

    Sea ice in the Chukchi Sea, on July 20, 2011. Sea ice in the Arctic has shrunk to the lowest levels ever recorded (Credit: Jeremy Potter NOAA/OAR/OER)

    Since 2007, the summer winds were found to blow through the Bering Strait, across the North Pole, more consistently from the south, out toward the Atlantic Ocean. These winds transfer additional heat from the south toward the North Pole and push sea ice across the Arctic and out into the Atlantic Ocean, contributing to record losses of summer sea ice. The 2012 Arctic summer sea ice minimum is the lowest on record.

    The study, entitled “The Recent Shift in Early Summer Arctic Atmospheric Circulation,” was co-authored by scientists from Rutgers University in New Jersey,  the University of Sheffield in the United Kingdom, and the Joint Institute for the Study of the Atmosphere and Ocean, a partnership of NOAA and the University of Washington. It can be found online.

    Sources: NOAA ClimateWatch, NNVL

    Featured image credit: (NASA/Kathryn Hansen)

    By chillymanjaro – October 24, 2012

    Small bear figurines have led researchers on the trail of hitherto unknown pre-Inuit rituals, indicating that these people practiced a bear cult.

    The headless bear figure was found lying with its neck against the back wall, as if it was diving into the fireplace This has led archaeologists to believe they are dealing with a hitherto unknown ritual practice. (Photo: The National Museum of Denmark)

    In the 1950s, the now deceased Danish archaeologist Jørgen Meldgaard made a mysterious discovery in northeastern Canada:

    A small, headless bear figurine, carved from a walrus tusk, was lying leaning up against the back wall of a stone fireplace in an old settlement. The bear had been positioned in a way that made it look as though it was ‘diving’ into the fireplace.

    At the time, this little figurine didn’t cause much of a stir. It was just one out of a long series of discoveries that Meldgaard made during his field trips to the Igloolik region of Arctic Canada and Greenland in the 1950s and 1960s.

    But when researchers at the Danish National Museum recently gained access to Meldgaard’s surviving diaries, records and photos, they realised that the discovery of the bear figurine was indeed quite sensational.

    Humans and animals were close

    Their examination of the material revealed that the small bear figurine could be an important key to understanding how people from more than 1,000 years ago viewed the relationship between animals and humans.

    ”The figurine provides us with information about some previously unknown 1,000-year-old rituals, which suggest that the Pre-Inuit, also known as the Dorset people, imagined that humans were related to certain animals in a way that’s very far from what we would imagine in today’s Western world,” says Ulla Odgaard, a senior researcher at the National Museum.

    “Apparently, the Dorset people in Greenland and Canada didn’t see any antagonism between humans and animals,” she adds.

    “Humans were not superior to animals; rather, it was a symbiotic co-existence. Bears and other animals functioned as mediators between mankind and the world of spirits.”

    The Dorset way of thinking is also known from other early cultures

    In other words, the finds reveal a belief in which animals – bears in particular – are our brothers, whose lives blend in with our own.

    The walrus tusk figurine is only 3.4 cm in length and could be an important key to understanding how people more than 1,000 years ago understood the relationship between humans and bears. The figure is thought to have disappeared now, leaving today’s archaeologists with little more than Jørgen Meldgaard’s sketches and blurry photos. (Photo: The National Museum of Denmark)

    The way the Dorset culture viewed the relationship between humans and animals is known as animism – a phenomenon also known from other cultures.

    “We know that the relationship between bears and humans has been crucial in all pre-modern cultures. This applies almost as far back in time as we can trace – all the way back to the very earliest renderings of the world that humans have created,” says Odgaard’s colleague at the National Museum, Martin Appelt.

    For instance, we see this relationship expressed in small carvings and cave paintings of humans and bears from the hunter-gatherer culture.

    “Many cultures have combined human and animal features in their illustrations – e.g. a figurine of a bear with a falcon’s body, where the underside depicts a carved human head,” he says.

    On many figurines from early cultures, the skeleton is cut so that it’s visible outside the body – and that’s also the case with Meldgaard’s bear figurine.

    According to Appelt, this bears witness to a belief that the difference between humans and animals only lies in the skin they’re wearing, so to speak.

    “So an animal is also a person – only with a different skin. And some of them have probably been regarded as spirits – i.e. people in a parallel universe to ours.”

    The bear was something special

    The apparent fact that bears were regarded as something special could be because the bear, along with man, is one of the few animals that were believed to transcend and travel between the worlds of land and sea.

    Another explanation may be that humans and bears could change roles depending on the situation: sometimes it was the man who hunted the bear and sometimes it was vice versa.

    The discovery of another bear was an eye opener

    Among the thousands of unique and spectacular objects that Jørgen Meldgaard and his colleagues excavated in the Canadian settlements in the 1950s and 60s, the many fine carvings made from walrus tusks, reindeer antler and driftwood are particularly interesting to archaeologists. These include small carvings of humans, human-like creatures and various animals, but also figures which seem to contain traits from both humans and animals. The figures reveal a belief in which animals – bears in particular – are our brothers, whose lives blend in with ours. (Photo: The National Museum of Denmark)

    Meldgaard also found another bear figurine in a nearby settlement.

    This bear stood upright with its head sticking up and the body half buried in the gravel.

    Underneath it they found a fireplace, which suggests that this bear apparently was about to rise up from the fireplace.

    The combination of both of the bear figurines’ interaction with the fireplaces led the Odgaard to believe that this could be a sign of rituals.

    Carved bear figurines and the symbolism of rising and diving bears is also known in other parts of the world, for instance in Siberia, where resurrection rituals have been performed for millennia, says Odgaard.

    Here, the bear was the mythical ancestor that every year travels to the upper world to secure the liberation of the animals’ souls, so that humans again can hunt them.

    The fireplace was the gateway to other worlds

    Legends from Siberia indicate that humans could communicate with the world of spirits through the fireplace. In other words, the fireplace may have been regarded as a gateway to other worlds.

    Bears are also known from Neolithic petroglyphs in Siberia and numerous finds of bear heads or headless bear figurines in the Arctic region. But none of these have been found in a ritual context like the two from Igloolik.

    Bear figurines could explain lack of finds of burial sites

    Since the ritual with fireplaces appears to stretch across time and space, the researchers believe the finds are of far greater importance than previously thought.

    Dorset people may have dismembered their dead

    Although there’s no shortage of ancient Inuit tales about the special relationship between humans and animals, the oral sources tend to dry out once we start moving toward the millennia before the Inuit settled in Arctic Canada and Greenland.

    “We have so far had glaringly few archaeological finds from pre-Inuit graves on other ritual elements that could increase our understanding of how the pre-Inuit people viewed their world,” says Appelt.

    “This is where the bear figurines suddenly make many pieces fall into place. Suddenly we understand the many other figures with bear heads or headless bears in a completely different way.”

    That the two bear figurines from the fireplaces have their skeletons carved on the outside of their bodies also confirms a suspicion the archaeologists have had that Dorset people probably dismembered their dead and scattered them out on the fields or sunk them in the sea, so they would end up as animal food – like we’re seeing in e.g. today’s Nepal and Tibet.

    “This suspicion is compounded by the fact that the few bones we’ve actually found from the Dorset culture are not whole skeletons, but simple elements – a jaw, a thighbone, etc.

    This suggests that the Dorset people had a completely different view of skeletons and bodies from what we have today – which the carvings of external skeletons on the bear figurines testify to.”

    Rituals transcend space and time

    Appelt says that the bear figurines from Igloolik are forcing archaeologists to think outside the box.

    Time and space not enough to understand the past

    The archaeologist explains that when you look at archaeological finds across the world, there are so many overlaps where rituals transcend across cultures, time and space that there seems to be a connection.

    “It’s very strange! And many archaeologists will surely find it unreasonable to think this way as an archaeologist – because how can things be connected in this way?” says Appelt.

    ”I don’t have the answer. There’s no answer book here. But I think the two headless bear figurines prove that it’s not always right to view history from within the narrow confines of time, space and traditions.

    The next step for Odgaard, Appelt and their colleagues is to create an overview of Meldgaard’s records and publish the most important scientific findings.

    Facts

    The Danish National Museum’s comprehensive research initiative ‘Northern Worlds’ aims to generate new insights into the relationship between man and the environment over the past 15,000 years, with a perspective on the present, where substantial climatic change is taking place.

     It will also shed light on global networks by studying Northern cultures from the Ice Age hunters to the present-day populations in the cold regions.

    ‘Northern Worlds’ consists of more than 20 projects, headed by leading researchers from all departments at the Danish National Museum.

    The bear figurines on the fireplaces are not only some of the few physical vestiges testifying to the Dorset culture’s view of life and death that archaeologist have ever come across.

    The figurines may also help explain an old mystery – why archaeologists only rarely find burial sites from the earliest settlers in Greenland and Arctic Canada.

    The Dorset people in Greenland and Canada (c. 700 to 1,200 AD) is an archaeological term for a non-Inuit people group from Greenland.

    The Dorset culture preceded the Inuit culture in Arctic North America. Archaeologists believe the people migrated from Siberia and Alaska between 4,000 years ago and until the birth of Christ.

    Iniuit legends mention Tunitt (singular Tuniq) or Sivullirmiut (‘The first inhabitants’) as a people who were displaced by the Inuit.

    Archaeologists, however, doubt whether or not the Inuit met with the Dorset culture, although there is a general consensus that the two groups have lived in the same area for a period.

    Dorset culture became extinct around 1902 – probably as a result of a change in climate and living conditions, but also because they were ousted by the Inuit.

    “We archaeologists prefer to work from the hypothesis that we can define various periods in history and that there is a clear division between space and time. But the figurines reveal that this is not the case here,” says Appelt.

    “Some phenomena, such as animism and the rituals with the fireplaces and the dismemberment of the dead, transcend time and space – which is why you simply need to view them in bits of several 100,000 years if they are to be understood and make sense.”

     

    Sciencenordic.com