The Katabatic winds howl around Antarctica’s gale thrashed coast. But once its green valley’s were filled with thriving Glossopteris Pine and Beach forests. How do we know this? “Scott of the Antarctic” was the first to discover telltale fossils on the Beardmore Glacier in 1912. Since then petrified tree stumps and leaves; bones of dinosaurs and marsupials; and fossil rich coal has been discovered in the now hostile environment.

According to classic geology, this previous lush environment thrived millions of years ago in the Permian age. The shifting Antarctic continent, inexorably plodding at millimetres per year, gradually moved into icy hibernation. The flora and fauna were iced over and slowly fossilized, just as in Greenland!

But wait! This formation of a three kilometre thick ice sheet is no meagre feat. Antarctica contains ninety percent of the world’s ice, yet some of Antarctica’s valleys are the driest places on earth. Antarctica is technically considered a desert. Incredibly little snow falls in the interior (five centimetres per year rain equivalent) where the ice sheet is considerably thicker. Katabatic snow storms occur only on the coast where there is thinner ice. Is this a contradiction? Nevertheless, classic Geologists argue that, eons of time can explain away these ice sheet anomalies. Continue article, click here

Thus the circle, that was first opened in 1857 by the famous Danish naturalist Japetus Steenstrup as he first described the animal, can be closed. It was Steenstrup that realized this beast was the same animal that in the past gave rise to centuries of sailors tails, and even in more recent became immortalized by writers such as Jules Verne and Herman Melville, by demonstrating that the monster was based in reality, and gave it the latin name Architeuthis dux.

It was less than 1 year ago, that the giant squid, Architeuthis dux, was first filmed alive in its natural element. Taken at a depth of 630m and after 100 missions and 400 hours of filming, the footage was captured by a small submarine lying off the Japanese island of Chichi Jima — near to the famous Iwo Jima that was the scene of some of the bloodiest fighting between Japan and the USA in the Second World War.

The giant squid is not only a fiction figure of Jules Verne and Herman Melville. It is also one of the most enigmatic animals on the planet. Now DNA-researchers at the University of Cophagen have found out that it is the same species all over the deep oceans of the planet – Credit: Anders Drud and Frederik Wolff Teglhus, University of Copenhagen, Denmark

Now, PhD student Inger Winkelmann and her supervisor Professor Tom Gilbert, from the Basic Research Centre in GeoGenetics at the Natural History Museum of Denmark, Copenhagen University, have managed to place new bricks into the puzzle of this giant 10 armed invertebrate, that is credibly believed to grow up to 13 meters long and way over 900 kg.

And the two scientists conclusions are: No matter what a sample looks like, its one species all over the deep oceans of the planet.

Sinking to the depths
PhD student Inger Winkelmann says about these findings, that are about to be published in the British journal the Proceedings of the Royal Society B.

We have analysed DNA from the remains of 43 giant squid collected from all over the world. The results show, that the animal is genetically nearly identical all over the planet, and shows no evidence of living in geographically structured populations. We suggest that one possible explanation for this is that although evidence suggests the adults remain in relatively restricted geographic regions, the young that live on the ocean’s surfaces must drift in the currents globally. Once they reach a large enough size to survive the depths, we believe they dive to the nearest suitable deep waters, and there the cycle begins again. Nevertheless, we still lack a huge amount of knowledge about these creatures. How big a range to they really inhabit as adults? Have they in the past been threatened by things such as climate change, and the populations of their natural enemies, such as the planet’s largest toothed whale, the sperm whale that can grow up to 20 m in length and 50 tons? And at an even more basic level…how old do they even get and how quickly do they grow?

The kraken and the seamonk
These new results about the mysterious giant squid are released, fittingly enough, on the 200th anniversary of the Danish naturalist and polymath, Japetus Steenstrup (born in 1813).

At the age of 44, in 1857, it was Steenstrup who saw that many of the monsters of sea-legend were related to fragments that he had been sent of what appeared to be a giant squid, and in doing so described the species for the first time and removed any hope that sea monsters such as the Kraken and sea-monk really existed (although nevertheless, similar monsters still inspired beasts in literature and even films throughout the 20th century, including Tolkein’s Lord of the Rings in 1957).

Professor Tom Gilbert, who lead the team that undertook the research, says: It has been tremendous to apply the latest techniques in genetic and computational analyses, to follow up on Steenstrup’s scientific research 146 years after he started it. But its also been a fantastic experience to work with the giant squid as a species, because of its legendary status as a seamonster. But despite our findings, I have no doubt that these myths and legends will continue get today’s children to open their eyes up — so they will be just as big as the real giant squid is equipped with to navigate the depths.

The work was undertaken in collaboration with researchers around the world, including scientists in Australia, New Zealand, Japan, Spain, Portugal, USA and Ireland.

Source: University of Copenhagen [March 20, 2013]

But if ice covered the earth all the way to the tropics during what is known as the Marinoan glaciation, how did the planet spring back from the brink of an ice apocalypse? Huiming Bao, Charles L. Jones Professor in Geology & Geophysics at LSU, might have some of the answers. Bao and LSU graduate students Bryan Killingsworth and Justin Hayles, together with Chuanming Zhou, a colleague at Chinese Academy of Sciences, had an article published on Feb. 5 in the Proceedings of the National Academy of Sciences, or PNAS, that provides new clues on the duration of what was a significant change in atmospheric conditions following the Marinoan glaciation.

“The story is to put a time limit on how fast our Earth system can recover from a total frozen state,” Bao said. “It is about a unique and rapidly changing post-glacial world, but is also about the incredible resilience of life and life’s remarkable ability to restore a new balance between atmosphere, hydrosphere and biosphere after a global glaciation.”

Artwork depicting Snowball Earth -vCredit: Chris Butler/SPL

Bao’s group went about investigating the post-glaciation period of Snowball Earth by looking at unique occurrences of “crystal fans” of a common mineral known as barite (BaSO4), deposited in rocks following the Marinoan glaciation. Out of the three stable isotopes of oxygen, O-16, O-17 and O-18, Bao’s group pays close attention to the relatively scarce isotope O-17. According to Killingsworth, there aren’t many phenomena on earth that can change the normally expected ratio of the scare isotope O-17 to more abundant isotope O-18. However, in sulfate minerals such as barite in rock samples from around 635 million years ago, Bao’s group finds large deviations in the normal ratio of O-17 to O-18 with respect to O-16 isotopes.

“If something unusual happens with the composition of the atmosphere, the oxygen isotope ratios can change,” Killingsworth said. “We see a large deviation in this ratio in minerals deposited around 635 million years ago. This occurred during an extremely odd time in atmospheric history.”

According to Bao’s group, the odd oxygen isotope ratios they find in barite samples from 635 million years ago could have occurred if, following the extensive Snowball Earth glaciation, Earth’s atmosphere had very high levels of carbon dioxide, or CO2. An ultra-high carbon dioxide atmosphere, Killingsworth explains, where CO2 levels match levels of atmospheric oxygen, would grab more O-17 from oxygen. This would cause a depletion of the O-17 isotope in air and subsequently in barite minerals, which incorporate oxygen as they grow. Bao’s group has found worldwide deposits of this O-17 depleted sulfate mineral in rocks dating from the global glaciation event 635 million years ago, indicating an episode of an ultra-high carbon dioxide atmosphere following the Marinoan glaciation.

“Something significant happened in the atmosphere,” Killingsworth said. “This kind of an atmospheric shift in carbon dioxide is not observed during any other period of Earth’s history. And now we have sedimentary rock evidence for how long this ultra-high carbon dioxide period lasted.”

By using available radiometric dates from areas near layers of barite deposits, Bao’s group has been able to come up with an estimate for the duration of what is now called the Marinoan Oxygen-17 Depletion, or MOSD, event. Bao’s group estimates the MOSD duration at 0 – 1 million years.

“This is, so far, really the best estimate we could get from geological records, in line with previous models of how long an ultra-high carbon dioxide event could last before the carbon dioxide in the air would get drawn back into the oceans and sediments,” Killingsworth said.

Normally, carbon dioxide levels in the atmosphere are in balance with levels of carbon dioxide in the ocean. However, if water and air were cut off by a thick layer of ice during Snowball Earth, atmospheric carbon dioxide levels could have increased drastically. In a phenomenon similar to the climate change Earth is witnessing in modern times, high levels of atmospheric carbon dioxide would have created a greenhouse gas warming effect, trapping heat inside the planet’s atmosphere and melting the Marinoan ice. Essentially, the Marinoan glaciation created the potential for extreme changes in atmospheric chemistry that in turn lead to the end of Snowball Earth and the beginning of a new explosion of animal life on Earth.

While previous work by Bao’s group had advanced the interpretation of the strange occurrence of O-17 depleted barite just after the Marinoan glaciation, there was still much uncertainty on the duration of ultra-high CO2 levels after meltdown of Snowball Earth. Bao’s discovery of a field site with many barite layers gave the opportunity to track how oxygen isotope ratios changed through a thickness of sedimentary rock. As the pages in a novel can be thought of as representing time, so layers of sedimentary rock represent geological history. However, these rock “pages” represented an unknown duration of time for the MOSD event. By using characteristic features of the Marinoan rock sequence occurring regionally in South China, Bao’s group linked the barite layer site to other sites in the region that did have precise dates from volcanic ash beds. Bao’s group has succeeded in estimating the duration of the MOSD event, and thus the time it took for Earth to restore “normal” CO2 levels in the atmosphere.

“To some extent, our findings demonstrate that whatever happens to Earth, she will recover, and recover at a rapid pace,” Bao said. “Mother Earth lived and life carried on even in the most devastating situation. The only difference is the life composition afterwards. In other words, whatever humans do to the Earth, life will go on. The only uncertainty is whether humans will still remain part of the life composition.”

Bao says that he had been interested in this most intriguing episode of Earth’s history since Paul Hoffman, Dan Schrag and colleagues revived the Snowball Earth hypothesis in 1998.

“I was a casual ‘non-believer’ of this hypothesis because of the mere improbability of such an Earth state,” Bao said. “There was nothing rational or logic in that belief for me, of course. I remember I even told my job interviewers back in 2000 that one of my future research plans was to prove that the Snowball Earth hypothesis was wrong.”

However, during a winter break in 2006, Bao obtained some unusual data from barite, a sulfate mineral dating from the Snowball Earth period that he received from a colleague in China.

“I started to develop my own method to explore this utterly strange world,” Bao said. “Now, it seems that our LSU group is the one offering the strongest supporting evidence for a ‘Snowball Earth’ back 635 million years ago. I certainly did not see this coming. The finding we published in 2008 demonstrates, again, that new scientific breakthroughs are often brought in by outsiders.”

Bao credits his research ideas, analytical work and pleasure of working on this project to his two graduate students, Killingsworth and Hayles, as well as his long-time Chinese collaborators. Bao brought Killingsworth and Hayles to an interior mountainous region in South China in December 2011, where the group succeeded in finding multiple barite layers in a section of rocks dating to 635 million years ago. This discovery formed a large part of their analysis and subsequent publication in PNAS.

“Nothing can beat the intellectual excitement and satisfaction you get from research in the field and in the laboratory,” Bao said.

Source: Louisiana State University via EurekAlert! [February 28, 2013]

The unusual event happened on Saturday and then on again on Sunday, from when the video below was filmed.

Dave Anderson, the boat’s owner, told The Los Angeles Times that throughout his 10 years in business he’s almost never seen a pod of dolphins this large charging through the waters at full speed.

“It’s one of the most amazing things I’ve ever seen, and I’ve seen a lot of beautiful and interesting things,” Anderson said.

It’s not clear why this happened, but Anderson guesses that the marine mammals may have been chasing something or were spooked.

“We don’t know. I know they’re not running away from the boat. It seems like they’re responding to something but I just don’t know what it is,” he told the website.

Watch the incredible phenomenon below:

High caffeine levels in the waters off the Oregon coast are likely the result of pollution from human waste, scientists say.

After testing water samples from 14 spots, researchers from Portland State University and Washington State University found high levels of caffeine at two sites far from large population centers, while discovering low levels of caffeine near cities and wastewater treatment plants. While far below deadly levels, the caffeine could be affecting marine life in unknown ways, the study’s authors say.

The ban, reported by Xinhua, the state-run news agency, could take as many as three years to take effect, and it remains unclear how widely it will be adhered to across a sprawling nation where orders issued by Beijing are often shrugged off by officials in faraway regions and provinces.

Still, the decision to stop serving shark fin soup at official functions was welcomed by environmental campaigners. Experts have long cautioned that soaring demand for the soup over the past two decades has imperiled shark populations around the globe.

“This is a very positive step forward,” said Andy Cornish, director of conservation at W.W.F. in Hong Kong. “It is the first time that the Chinese central government has expressed a decision to phase out shark fin from banquets funded by taxpayers’ money.” He said the move would send an important signal to consumers in China, the largest market for the fins.

Stan Shea, a project coordinator in Hong Kong at Bloom Association, a marine conservation organization, likewise welcomed the policy change, saying it represented a “big step” to help shark populations.

The soup, brewed from dried shark fins, is largely tasteless and slithery but has considerable cachet as a status symbol. Many in China consider it a must-serve at lavish, multicourse banquets to celebrate weddings, anniversaries and corporate and state events.

Retailers in Hong Kong, the main hub for the international trade in the fins, charge more than 2,000 Hong Kong dollars, or $260, per catty, a traditional weight measure commonly used in markets here. Equal to just over one pound, one catty makes about 10 portions of soup, which works out to $26 a portion.

Rapid economic growth across Asia in recent years has catapulted millions into the ranks of those who can now afford the dish.

In an effort to conserve shark populations, several nations have banned the fishing of sharks. Several American states, including California, have banned the possession, sale and distribution of shark fins. And in Hong Kong, several high-end restaurants and hotels have recently taken shark fin off the menu in response to shifting public awareness in the city. The Hong Kong government has so far resisted calls from shark conservationists to curtail the trade or consumption of shark fins.

“The Hong Kong government has repeatedly dodged the question of implementing a banqueting ban on shark fin soup, saying that it sees no need for such guidelines,” said Mr. Cornish of W.W.F. “We strongly hope that the new administration in Hong Kong government will shortly follow suit.”

The Hong Kong Environmental Protection Department’s media office, in an e-mail on Tuesday, reiterated its long-held stance that the government carries out the Convention on International Trade in Endangered Species of Wild Fauna and Flora, known by its acronym, Cites.

Environmentalists, however, argue that Cites should list as threatened a far larger number of shark species than it does.

Hong Kong government guidelines stipulate that official banquets not be “extravagant,” and this means menus do not “generally include shark fin,” the media department added. It did not say whether Hong Kong would echo Beijing’s decision to ban the dish from official banquets. Source: New York Times

Analysis carried out at the Australian Nuclear Science and Technology Organisation (ANSTO) on the skeletal remains of extinct megafauna is providing substantial proof that for about 2,000 years they infact shared the island with early humans before suddenly disappearing some time before the last ice age.

The findings challenge for the first real time history’s version of events and by now placing our ancestors in Tasmania at the same time as large prehistoric animals, like the Protemnodon anak (a giant wallaby), raises the chances we were involved in their extinction.

An illustration of the Simosthenurus or 'short-faced' kangaroos were among Australia's most common Megafauna species - Credit: megfauna.com.au

Geological work on sea level change suggests humans could not have crossed Bass Strait until around 43,000 years ago when the island was temporarily connected by a land bridge to Australia. The vanishing of megafauna was thought to have occurred thousands of years preceding human arrival, clearing them from any involvement.

That is, of course, until now.

Closing the gap between humans and megafauna
Using a technique called radiocarbon dating and a rethink on what samples are used, scientists carrying out the investigative work at Lucas Heights came up with a new set of theories.

Radiocarbon dating uses the amount of Carbon 14 available in living creatures as a measuring stick. Comparing the amount of C14 in a dead organism to available levels in the atmosphere, produces an estimate of when that organism died.

For this analysis, the team decided to carbon date protein samples found in the bones of their subjects, which were prehistoric relatives of the kangaroo, wombat and Tasmanian Devil, using the STAR and ANTARES research accelerators located at ANSTO. Continue reading, source: ANSTO [May 28, 2012]

The article notes that unlike earlier devices, which used costly ingredients, the new device is made from inexpensive materials and employs low-cost engineering and manufacturing processes.

The new self-contained units are inexpensive and attractive for making fuel for electricity in remote places and the developing world. (Credit: ACS)

To make these devices more widely available, Nocera replaced the platinum catalyst that produces hydrogen gas with a less-expensive nickel-molybdenum-zinc compound. On the other side of the leaf, a cobalt film generates oxygen gas. Nocera notes that all of these materials are abundant on Earth, unlike the rare and expensive platinum, noble metal oxides and semiconducting materials others have used. “Considering that it is the 6 billion nonlegacy users that are driving the enormous increase in energy demand by midcentury, a research target of delivering solar energy to the poor with discoveries such as the artificial leaf provides global society its most direct path to a sustainable energy future,” he says.

The author acknowledges support from the National Science Foundation and the Chesonis Family Foundation.

Source: ScienceDaily (May 9, 2012)

Scientists from Scripps Institution of Oceanography in San Diego found that insects called “sea skaters” or “water striders” were using the trash as a place to lay their eggs in greater numbers than before. Continue, MSN

The finding comes from a paper funded by the National Science Foundation (NSF) and NASA and published in today’s journal Science.

While the study indicates that a melting Greenland’s contributions to rising sea levels could be less than expected, researchers concede that more work needs to be done before any definitive trend can be identified.

Studies like this one are designed to examine more closely and in greater detail what is actually happening with the ice sheets, often using newer and more precise tools and thereby better defining the parameters that scientists use to make predictions, such as the upper limits of sea-level rise.

“This study provides more evidence that the rate at which these glaciers can dump ice into the ocean is indeed limited,” said Ian Howat, assistant professor of Earth sciences and member of the Byrd Polar Research Center at Ohio State University, a co-author on the paper. “What remains to be seen is how long the acceleration will continue–but it appears that our worst-case scenarios aren’t likely.”

The fate of the Earth’s ice sheets and their potential contributions to sea-level rise as the globe warms are among the major scientific uncertainties cited in the Fourth Assessment of the Intergovernmental Panel on Climate Change (IPCC). This is in part because the Greenland and Antarctic ice sheets have historically been, and in large measure continue to be, relatively sparsely monitored, as compared to other parts of the globe.

The faster the glaciers move, the more ice and melt water they release into the ocean.

In previous studies, scientists trying to understand the contribution of melting ice to rising sea level in a warming world considered a scenario in which the Greenland glaciers would either double or increase by as much as ten-fold their velocity between 2000 and 2010 and then stabilize at the higher speed.

This new study shows Greenland ice would likely move at the lower rate–a doubling of its speed–and contribute about four inches to rising sea level by 2100. The previous studies used the higher speed and estimated the glaciers would contribute nearly 19 inches by the end of this century.

In the new study, the scientists extracted a decade-long record of changes in Greenland outlet glaciers by producing velocity maps using data from the Canadian Space Agency’s Radarsat-1 satellite, Germany’s TerraSar-X satellite and Japan’s Advanced Land Observation Satellite. They started with the winter of 2000-01 and then repeated the process for each winter from 2005-06 through 2010-11 and found that the outlet glaciers had not increased in velocity as much as had been speculated.

“So far, on average we’re seeing about a 30 percent speedup in 10 years [of Greenland glaciers, which gives new insight for rising sea level],” said Twila Moon, a University of Washington doctoral student in Earth and space sciences and lead author of the paper documenting the observations.

“This study is a great example of the power of high-resolution data sets in both space and time, and the importance of looking carefully at as much data as possible in helping make the best predictions we can of future changes”, said Henrietta Edmonds, program director for Arctic Natural Sciences in NSF’s Office of Polar Programs.

The scientists saw no clear indication in the new research that the glaciers will stop gaining speed during the rest of the century, and so by 2100 they could reach or exceed the scenario in which they contribute four inches to sea level rise.

The record showed a complex pattern of behavior. Nearly all of Greenland’s largest glaciers that end on land move at top speeds of 30 to 325 feet a year, and their changes in speed are small because they are already moving slowly. Glaciers that terminate in fjord ice shelves move at 1,000 feet to a mile a year, but didn’t gain speed appreciably during the decade.

In the East, Southeast and Northwest areas of Greenland, glaciers that end in the ocean can travel seven miles or more in a year. Their changes in speed varied (some even slowed), but on average the speeds increased by 28 percent in the Northwest and 32 percent in the Southeast during the decade.

Moon said she was drawn to the research from a desire to take the large store of data available from the satellites and put it into a usable form to understand what is happening to Greenland’s ice. “We don’t have a really good handle on it and we need to have that if we’re going to understand the effects of climate change,” she said. “We are going to need to continue to look at all of the ice sheet to see how it’s changing, and we are going to need to continue to work on some tough details to understand how individual glaciers change.”

Source: National Science Foundation [May 04, 2012]