Science

Robot provides unprecedented views below Antarctic ice shelf

Published

2 years ago

March 20, 2023

Newswise — High in a narrow, seawater-filled crevasse in the base of Antarctica’s largest ice shelf, cameras on the remotely operated Icefin underwater vehicle relayed a sudden change in scenery.

Walls of smooth, cloudy meteoric ice abruptly turned green and rougher in texture, transitioning to salty marine ice.

Nearly 1,900 feet above, near where the surface of the Ross Ice Shelf meets Kamb Ice Stream, a U.S.-New Zealand research team recognized the shift as evidence of “ice pumping” – a process never before directly observed in an ice shelf crevasse, important to its stability.

“We were looking at ice that had just melted less than 100 feet below, flowed up into the crevasse and then refrozen,” said Justin Lawrence, visiting scholar at the Cornell Center for Astrophysics and Planetary Science. “And then it just got weirder as we went higher up.”

The Icefin robot’s unprecedented look inside a crevasse, and observations revealing more than a century of geological processes beneath the ice shelf, are detailed in “Crevasse Refreezing and Signatures of Retreat Observed at Kamb Ice Stream Grounding Zone,” published March 2 in Nature Geoscience.

The paper reports results from a 2019 field campaign to Kamb Ice Stream supported by Antarctica New Zealand and other New Zealand research agencies, led by Christina Hulbe, professor at the University of Otago, and colleagues. Through support from NASA’s Astrobiology Program, a research team led by Britney Schmidt, associate professor of astronomy and earth and atmospheric sciences at Cornell, was able to join the expedition and deploy Icefin. Schmidt’s Planetary Habitability and Technology Lab has been developing Icefin for nearly a decade, beginning at the Georgia Institute of Technology.

Combined with recently published investigations of the fast-changing Thwaites Glacier – explored the same season by a second Icefin vehicle – the research is expected to improve models of sea-level rise by providing the first high-resolution views of ice, ocean and sea floor interactions at contrasting glacier systems on the West Antarctic Ice Sheet.

Thwaites, which is exposed to warm ocean currents, is one of the continent’s most unstable glaciers. Kamb Ice Stream, where the ocean is very cold, has been stagnant since the late 1800s. Kamb currently offsets some of the ice loss from western Antarctica, but if it reactivates could increase the region’s contribution to sea-level rise by 12%.

“Antarctica is a complex system and it’s important to understand both ends of the spectrum – systems already undergoing rapid change as well as those quieter systems where future change poses a risk,” Schmidt said. “Observing Kamb and Thwaites together helps us learn more.”

NASA funded Icefin’s development and the Kamb exploration to extend ocean exploration beyond Earth. Marine ice like that found in the crevasse may be an analog for conditions on Jupiter’s icy moon Europa, the target of NASA’s Europa Clipper orbital mission slated for launch in 2024. Later lander missions might one day search directly for microbial life in the ice.

Icefin carries a full complement of oceanographic instruments on a modular frame more than 12 feet long and less than 10 inches in diameter. It was lowered on a tether through a borehole the New Zealand team drilled through the ice shelf with hot water.

During three dives spanning more than three miles near the grounding zone where Kamb transitions to the floating Ross shelf, Icefin mapped five crevasses – ascending one – and the sea floor, while recording water conditions including temperature, pressure and salinity.

The team observed diverse ice features that provide valuable information about water mixing and melt rates. They included golf ball-like dimples, ripples, vertical runnels and the “weirder” formations near the top of the crevasse: globs of ice and finger-like protrusions resembling brinicles.

Ice pumping observed in the crevasse likely contributes to the relative stability of the Ross Ice Shelf – the world’s largest by area, the size of France – compared to Thwaites Glacier, the researchers said.

“It’s a way these big ice shelves can protect and heal themselves,” said Peter Washam, a polar oceanographer on the Icefin science team and the paper’s second author. “A lot of the melting that happens deep near the grounding line, that water then refreezes and accretes onto the bottom of the ice as marine ice.”

On the sea floor, Icefin mapped parallel sets of ridges that the researchers believe are impressions left behind by ice shelf crevasses – and a record of 150 years of activity since the Kamb stream stagnated. As its grounding line retreated, the ice shelf thinned, causing the crevasses to lift away. The ice’s slow movement over time shifted the crevasses seaward of the ridges.

“We can look at those sea floor features and directly connect them to what we saw on the ice base,” said Lawrence, the paper’s lead author, now a program manager and planetary scientist at Honeybee Robotics. “We can, in a way, rewind the process.”

In addition to Lawrence, Washam and Schmidt, Cornell co-authors of the research are Senior Research Engineers Matthew Meister, who led the Icefin engineering team, and Andrew Mullen; Research Engineer Daniel Dichek; and Program Manager Enrica Quartini. Schmidt’s team also includes Research Engineer Frances Bryson, and at Georgia Tech, doctoral students Benjamin Hurwitz and Anthony Spears.

Also contributing were partners from New Zealand at the National Institute of Water and Atmospheric Research (NIWA); University of Auckland; University of Otago; and Victoria University of Wellington.

NASA supported the research through the Planetary Science and Technology from Analog Research program’s Project RISE UP (Ross Ice Shelf and Europa Underwater Probe), and the Future Investigators in NASA Earth and Space Science and Technology program. Additional support came from New Zealand’s Antarctic Science Platform, the U.S. Antarctic Program and Victoria University of Wellington’s Hot Water Drilling initiative.

Source: Cornell University

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Mysterious Lights Over Oregon: Pilots Report Unusual Aerial Phenomena

Published

3 days ago

December 19, 2024

Rod Washington

This past weekend, the skies of Oregon became the backdrop for an extraordinary event that has both puzzled and dazzled observers. At least four commercial pilots reported encountering unexplained bright lights displaying incredible speeds and erratic movements, renewing interest and debate about aerial phenomena.

The Encounter Details

The first report came from a pilot operating an air ambulance who described a startling experience. A bright, red light zoomed towards his Life Flight plane, only to reverse direction and head back towards the Pacific Ocean at bewildering speeds. The event left the pilot and his crew astounded by the light’s velocity and abrupt maneuvers.

Meanwhile, the pilot of a United Airlines flight over Eugene also reported seeing multiple mysterious objects. These unidentified lights moved vertically and horizontally in patterns that defied easy explanation, with no evidence of military activity in the area at the time.

Adding to the intrigue, the Life Flight pilot noted that one of the lights engaged in a corkscrew pattern, an observation that was corroborated by the aircraft’s collision avoidance system. Air traffic control, maintaining a cautious approach, authorized the pilot to maneuver as necessary to maintain safety.

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Visual Evidence and Continued Sightings

Throughout these encounters, several pilots managed to capture brief video clips. These clips, although hard to discern due to the dark conditions, show glimpses of the unusual red, circular lights. Another report from two Horizon Airlines pilots further confirmed that whatever was out there wasn’t isolated to a single incident or observer.

Experts Weigh In: Possible Explanations

In the wake of these mystifying sightings, experts have been quick to offer explanations. Douglas Buettner, a scientist who has researched similar incidents, suggests that these lights could likely be flares from Starlink satellites. Starlink, a constellation designed by SpaceX to provide global broadband coverage, has been known to produce vivid optical flares when its panels reflect sunlight.

Buettner’s research, which includes previous pilot reports and observations, supports the idea that this natural reflection of sunlight could explain the phenomena observed. However, he also admits the current data is insufficient to conclusively rule out other possibilities.

Government and Public Response

Following these reports, the Federal Aviation Administration (FAA) confirmed the sighting of unidentified lights by a pilot, although they have not commented further. In a recent Senate hearing, the Pentagon’s director overseeing unidentified anomalous phenomena indicated a spike in such reports since the launch of satellite constellations like Starlink, underscoring the growing interest and concern regarding these observations.

The Broader Implications

While the most likely explanation for these mysterious lights points to satellite flares, the repeated occurrences of such phenomena continue to stir the public’s imagination and scientific curiosity. As we advance in our technological capabilities, the skies above us grow increasingly populated with human-made objects that can sometimes return to us as bewildering spectacles.

In either case, these events serve as a reminder of the vast and unexplored frontiers above us and the ever-present human quest for understanding the mysteries of our universe. Whether they turn out to be mundane or truly otherworldly, the skies over Oregon this weekend have given us all something to ponder and marvel at.

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New Jersey Drone Sightings: Unraveling the Mystery

Published

3 days ago

December 18, 2024

Rod Washington

In recent weeks, New Jersey has increasingly found itself under the watchful eye of mysterious drones. These sightings have captivated residents and officials alike, leading to widespread speculation and calls for action. Below is a comprehensive update on the current situation regarding drone sightings in the Garden State, including insights from government officials and community reactions.

The Surge of Sightings

Reports of large drones—up to six feet in diameter—flying over various regions of New Jersey have surged since mid-November. Assemblywoman Dawn Fantasia highlighted the unusual characteristics of these drones, often flying with their lights off and evading detection by traditional methods. Though the origin and purpose of these drones remain unclear, many are convinced that they are not the product of hobbyists.

Notably, many sightings have been concentrated near sensitive locations such as the Picatinny Arsenal, a U.S. military research facility, and Trump National Golf Club in Bedminster. Concerns have only intensified since these drones seem to be operating outside the realm of normal commercial or recreational use.

Government Investigations and Assurances

Federal and state law enforcement agencies, including the FBI and the Department of Homeland Security (DHS), have become actively involved in investigating these sightings. Despite receiving over 5,000 tips, officials state that there is currently no evidence suggesting that these drones pose a threat to national security or public safety. Instead, authorities believe that many of the reported sightings can be attributed to legal drones and other aerial phenomena, including misidentified manned aircraft and even celestial bodies like stars.

Governor Phil Murphy has reinforced this perspective, emphasizing that while drone sightings have raised valid concerns, there’s no immediate threat to public safety. The governor has called for federal assistance in the investigation and urged Congress to empower states with more authority to manage drone activities.

Congressional Response and Public Sentiment

The situation has sparked a debate among lawmakers, with some calling for stricter regulations or even a temporary ban on drone flights in New Jersey. Notably, two congressional representatives have gone so far as to request that the military intervene, highlighting the urgency felt by some constituents. U.S. Rep. Jeff Van Drew even suggested that a foreign entity could be behind the sightings, a theory that has been categorically denied by federal officials.

Public sentiment varies significantly, with many residents expressing concerns about the unknown nature of these drones. James Edwards from Succasunna has pointed out the anxiety gripping the community, noting, “There’s so much that’s unknown,” and calling for a measured response to the sightings.

The View from Washington

At the national level, President Joe Biden has responded to the growing unease, asserting that there is nothing nefarious behind the drone sightings. He emphasized the lawful presence of over one million registered drones operating across the country and assured the public that the situation is being closely monitored.

John Kirby, the White House National Security Advisor, reiterated that the majority of drone sightings do not indicate a coordinated threat and stem from common commercial, hobbyist, or law enforcement operations.

What Lies Ahead?

As investigations continue, officials stress the importance of discerning legitimate threats from unwarranted fears. The situation remains fluid, with ongoing dialogues both in Trenton and Washington to address public concerns and craft appropriate regulatory responses.

While the mystery of the New Jersey drones deepens, it’s vital for residents to remain calm and informed. As the investigation unravels the truths behind these sightings, a collective effort from the community, lawmakers, and federal agencies can help ensure safety and transparency in the skies above New Jersey.

Stay tuned for updates as this story continues to evolve, and be sure to report any new sightings or information to the appropriate authorities. Together, we can navigate the complexities of drone activity in our airspace while embracing this new technological frontier.

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Learning from Voices of War: Honoring the 80th anniversary of World War II’s final major battle

Published

6 days ago

December 16, 2024

Daily News Staff

(Family Features) The Ardennes Offensive, commonly known as the “Battle of the Bulge,” stands as the single bloodiest battle fought by the United States during World War II. Waged in the bitter cold of mid-December 1944, it took the Allies a month to secure victory. The cost was staggering: nearly 20,000 Americans were killed in action, close to 50,000 wounded and another 20,000 captured.

In honor of the 80th anniversary of this pivotal battle, the Library of Congress Veterans History Project has launched an online exhibit to commemorate the milestone. While the battle itself is etched in the annals of history, the personal stories from those who endured it remain one of the most powerful testaments to its impact.

The online exhibit, “Serving Our Voices,” features accounts from 12 Battle of the Bulge survivors, part of the thousands of narratives preserved by the project. These stories ensure future generations can gain deeper understanding of veterans’ service and sacrifice.

One such story includes Eliot Annable, a 20-year-old radio operator serving with the Army’s 106th Infantry Division. Just days after arriving at the western front, Annable found himself under German artillery barrages on. Dec. 16, 1944. He recalled the assault in his oral history, describing the intensity as “almost enough to knock you on the floor.”

The following five days became the most harrowing days of Annable’s military service. While on a communications mission, he became stranded behind enemy lines and spent nearly a week evading the enemy in the Ardennes Forest without food, shelter or appropriate winter clothing. After traveling more than 30 miles, he eventually safely rejoined the remnants of his unit.

Back home, Annable’s parents were gripped by uncertainty. On Dec. 31, 1944, his father wrote a letter expressing the family’s anguish and love for their son, regardless of what happened. The moving letter, coupled with Annable’s oral history, provides an intimate view into one soldier’s Battle of the Bulge experience.

Another featured veteran in the exhibit, Guy Martin Stephens, also served with the 106th Infantry Division. Unlike Annable, Stephens was captured by the Germans during battle. In his oral history, he recounted the surreal feeling of combat, the relentless hunger he endured as a prisoner of war and the lingering effects of his time in captivity.

“It’s hard,” Stephens said. “It’s something you can’t ever … your mind is just like a video, or camcorder, I guess. You put it in there. You get busy and get married. You get home, and you get an education, and get a job, and raise your family and everything like that. You can kind of gloss it over or try to push it back, but it’s always there, you know?”

Veterans who served during the 20th or 21st centuries are invited to establish a collection, including interviews (video or audio), letters and original photographs, even if they did not see combat. Families can also submit collections posthumously to honor their loved ones. To explore more veterans’ stories and learn how you can contribute to the program, visit loc.gov/vets.

Photos courtesy of Library of Congress Veterans History Project

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SOURCE:
Library of Congress Veterans History Project