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Proposed Experiment Could Clarify Origin of Martian Methane

EOS - Mon, 05/12/2025 - 13:08
Source: Journal of Geophysical Research: Planets

Over the past decade, the Curiosity rover has repeatedly detected methane on the surface of Mars. This gas is often produced by microbes, so it could herald the presence of life on the Red Planet. But skeptics have postulated that the gas detected by Curiosity could have a much more pedestrian origin. Viscardy et al. suggest the methane could be coming from inside the Curiosity rover itself rather than from the atmosphere of Mars. They propose an experiment that could differentiate between microbes and a technological source.

There’s ample reason to believe something is going awry, the researchers say. Each methane measurement that Curiosity’s spectrometer reports is actually the average of three individual measurements. Though those averages tend to suggest the presence of methane, the individual measurements are far more variable, bringing the results into question.

Another issue concerns the instability of gas pressures inside the spectrometer. The two main compartments—the foreoptics chamber that holds the laser source and the cell that holds the Martian air sample—are designed to remain sealed from each other and from the outside environment. However, significant pressure variations observed in both compartments, even during individual measurement runs, suggest this isn’t the case. These pressure changes raise doubts about the hermetic sealing of the system and the integrity of the analyzed air samples.

It’s clear, however, that at least some of the methane traveled to Mars from Earth. Prior to launch from Cape Canaveral in 2011, Florida air is known to have leaked into the foreoptics chamber. This contamination has persisted despite multiple gas evacuations, pointing to unidentified methane reservoirs or production mechanisms within the instrument. As a result, methane levels in this compartment are more than 1,000 times higher than those measured in the cell storing the Martian air sample for analysis. Even an “imperceptible” leak between the chambers could cause Curiosity to report erroneous methane levels, the researchers write.

To put the issue to rest, the researchers suggest analyzing the methane content of the same sample of Martian air on two consecutive nights. A concentration of methane that is higher on the second night than on the first night would suggest that methane is leaking into the sample from elsewhere in the rover rather than coming from the planet itself. (Journal of Geophysical Research: Planets, https://doi.org/10.1029/2024JE008441, 2025)

—Saima May Sidik (@saimamay.bsky.social), Science Writer

Citation: Sidik, S. M. (2025), Proposed experiment could clarify origin of Martian methane, Eos, 106, https://doi.org/10.1029/2025EO250182. Published on 12 May 2025. Text © 2025. AGU. CC BY-NC-ND 3.0
Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.

Microbial 'phosphorus gatekeeping' found at center of study exploring 700,000 years of iconic coastline

Phys.org: Earth science - Mon, 05/12/2025 - 09:00
A new study has dug deep into the past of the coastal dunes of an iconic Queensland location in a bid to better understand how microscopic processes in the soil support some of the most biodiverse landscapes on Earth.

Seismic analysis to understand the 13 February 2024 Çöpler Gold Mine Landslide, Erzincan, Türkiye 

EOS - Mon, 05/12/2025 - 06:44

The Landslide Blog is written by Dave Petley, who is widely recognized as a world leader in the study and management of landslides.

On 13 February 2024, the enormous Çöpler Gold Mine Landslide occurred in Erzincan, Türkiye (Turkey), killing nine miners. This was the first of two massive and immensely damaging heap leach mine failures last year (the other occurred in Canada). That such an event could occur has come as something of surprise to many people, so there is intense interest in understanding the circumstances of the failure.

I posted about the landslide at the time, and subsequently:

At the time, Capella Space captured this amazing radar image of the aftermath of the landslide (which is highlighted):

A radar image of the 13 February 2024 landslide at Çöpler Mine in Türkiye (Turkey), courtesy of Capella Space.

Analysis of this landslide is ongoing, and information is emerging on a regular basis. The latest is an open access paper (Büyükakpınar et al. 2025the PDF is here) in The Seismic Record that combines analysis of the seismic data from the landslide with remote sensing data to try to understand the failure.

The use of seismic data for landslide analysis often causes confusion, with people interpreting it to mean that the landslide was triggered by an earthquake. This is not the case – the scale of this landslide meant that it generated a seismic signal that was detected up to 400 km from the source. This data can be analysed to provide information about the landslide itself.

Büyükakpınar et al. (2025) provides three really interesting insights into the Çöpler Gold Mine Landslide, confirming initial observations. The first is that there are two distinct seismic signals, 48 seconds apart. Thus, there were two landslide events. The first detached to the west, representing a collapse of a steep slope into the deep excavation. The second moved to the north‐northeast, on a more gentle slope. It is the second that was caught on video, and that is highlighted in the Capella Space image. In fact the first landslide can also be seen in the image – in particular the landslide deposit at the bottom of the deep excavation. The analysis also suggests that the combined landslide volume was about 1.2 millon m3, of which the second landslide was about 1 millon m3.

I would note that soon after the landslide,  Tolga Gorum correctly identified that the image shows that the landslide moved in two directions.

Second, Büyükakpınar et al. (2025) have used an InSAR analysis to examine precursory deformation of the heap leach pad before the failure. This suggests that the mass was moving at up to 60 mm per year over the four years prior to the failure. The trend is quite linear, so it is not obvious that it would have provided an indication that failure was imminent, but this level of movement would be quite surprising in a well managed site.

Finally, and perhaps most importantly, Büyükakpınar et al. (2025) also show that the embankment below the cyanide leach pond (labelled in the pre-failure Google Earth imagery below) is now moving at up to 85 mm/year. As the authors put it this “raises significant concerns about the potential for further instability in the area”.

Google Earth image showing the site of the 13 February 2024 Çöpler Gold Mine Landslide, Erzincan, Türkiye (Turkey). The embankment that is showing active deformation is highlighted.

One can only hope that this hazard, in a seismically active area, is being addressed and that lessons have been learnt.

Reference

Büyükakpınar, P. et al. 2025. Seismic, Field, and Remote Sensing Analysis of the 13 February 2024 Çöpler Gold Mine Landslide, Erzincan, TürkiyeThe Seismic Record 5 (2): 165–174. doi: https://doi.org/10.1785/0320250007

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Identification of representative earthquakes for probabilistic tsunami hazard analysis (PTHA) using earthquake rupture forecasts and machine learning

Geophysical Journal International - Sat, 05/10/2025 - 00:00
SummaryAs probabilistic tsunami hazard analysis (PTHA) focuses more on assessments for localized, populous regions, techniques are needed to identify a subsample of representative earthquake ruptures to make the computational requirements for producing high-resolution hazard maps tractable. Moreover, the greatest epistemic uncertainty in seismic PTHA is related to source characterization, which is often poorly defined and subjective. We address these two salient issues by applying streamlined earthquake rupture forecasts (ERFs), based on combinatorial optimization methods, to an unsupervised machine learning workflow for identifying representative ruptures. ERFs determine the optimal distribution of a millennia-scale sample of earthquakes by inverting the observed slip rate on major faults. We use two previously developed combinatorial optimization ERFs, integer programming and greedy sequential, to produce the optimal location of ruptures with seismic moments sampled from a regional Gutenberg-Richter magnitude-frequency distribution. These ruptures in turn are used to calculate peak nearshore tsunami amplitude, using computationally efficient tsunami Green's functions. An unsupervised machine learning workflow is then used to identify a small sub-sample of the earthquakes input to ERFs for onshore PTHA analysis. We eliminate epistemic uncertainty related to source distribution under traditional PTHA analysis; in its place, a quantifiable, less subjective, and generally smaller uncertainty related to the input to ERFs is included. The Nankai subduction zone is used as a test case, where previous ERFs have been conducted. Results indicate that the locations of representative earthquakes are sensitive to choice of magnitude-area relation and to whether a minimum cumulative stress objective is imposed on the fault. In general, incorporating ERFs into PTHA provide a physically self-consistent method to incorporate fault slip information in determining representative earthquakes for onshore PTHA, eliminating a major source of epistemic uncertainty.

Bayesian Event Categorization Matrix Approach for Explosion Monitoring

Geophysical Journal International - Sat, 05/10/2025 - 00:00
SummaryCurrent efforts to correctly categorize natural events from suspected explosion sources with data that is collected by ground- or space-based sensors presents historical challenges that remain unaddressed by the Event Categorization Matrix (ECM) model. Smaller historical events (lower-yield explosions) may have data available from fewer measurement techniques than are available today, and therefore, a historical event record can lack a complete set of discriminants. The covariance structures can also differ between such observations of event (source-type) categories. Both obstacles are problematic for the classic Event Categorization Matrix model. Our work addresses this gap and presents a Bayesian update to the previous Event Categorization Matrix model, termed the Bayesian Event Categorization Matrix model, which can be trained on partial observations and does not rely on a pooled covariance structure. We further augment the Event Categorization Matrix model with Bayesian Decision Theory so that false negative or false positive rates of an event categorization can be reduced in an intuitive manner. To demonstrate improved categorization rates for the Bayesian Event Categorization Matrix model, we compare an array of Bayesian and classic models with multiple performance metrics using Monte Carlo experiments. We use both synthetic and real data. Our Bayesian models show consistent gains in overall accuracy and lower false negative rates relative to the classic Event Categorization Matrix model. We propose future avenues to improve Bayesian Event Categorization Matrix models’ decision making and predictive capability.

Trump Blocks Funding for EPA Science Division

EOS - Fri, 05/09/2025 - 19:56
body {background-color: #D2D1D5;} Research & Developments is a blog for brief updates that provide context for the flurry of news regarding law and policy changes that impact science and scientists today.

The Trump administration has blocked funding for the EPA’s Office of Research and Development (ORD), the agency’s main science division.

An email sent 7 May and first reported by E&E News said that research laboratory funding had been stopped except for requests related to health and safety. Nature then obtained additional internal e-mails regarding the funding freeze which were confirmed by anonymous EPA sources.

“Lab research will wind down over the next few weeks as we will no longer have the capability to acquire supplies and materials,” one of the emails said.

The freeze appears to disregard a Congressional spending agreement that guaranteed EPA funding at 2024 levels through September.

On 2 May, EPA administrator Lee Zeldin announced a “reorganization” within the EPA to ensure that its research “directly advances statutory obligations and mission-essential functions.” Zeldin assured members of the House Committee on Science, Space, and Technology that ORD would not experience significant changes during the reorganization, and this latest funding freeze seems to break that promise.

 
Related

“We are unsure if these laboratory activities will continue post-reorganization,” the 7 May email stated. “Time and funding would be needed to reconstitute activities.”

The EPA told E&E News that the email was “factually inaccurate” and that ORD is not part of the planned reorganization.

But Jennifer Orme-Zavaleta, who served as principal deputy assistant administrator at ORD during Trump’s first presidency, said that “They have basically shut ORD down by cutting off the money.”

The 2 May reorganization announcement also included a deadline for the nearly 1,500 ORD staff to either apply for a new position within the EPA, retire, or resign. That deadline is at 11:59 on 9 May. Fewer than 500 new jobs have been posted at the agency, and hundreds of EPA employees have already been fired.

—Kimberly M. S. Cartier (@astrokimcartier.bsky.social), Staff Writer

These updates are made possible through information from the scientific community. Do you have a story about how changes in law or policy are affecting scientists or research? Send us a tip at eos@agu.org. Text © 2025. AGU. CC BY-NC-ND 3.0
Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.

Machine learning powers new approach to detecting soil contaminants

Phys.org: Earth science - Fri, 05/09/2025 - 15:49
A team of researchers at Rice University and Baylor College of Medicine has developed a new strategy for identifying hazardous pollutants in soil, even ones that have never been isolated or studied in a lab.

Krakatoa: The mystery of 1883

Phys.org: Earth science - Fri, 05/09/2025 - 14:51
In the quiet Vasse district of WA, the evening of 27 August 1883 must have felt like something out of a mystery novel.

Chipping away at the ice ceiling: Women scientists explore Nepal's Ponkar Glacier

Phys.org: Earth science - Fri, 05/09/2025 - 14:36
One chilly morning this past December, nine women awoke to the sight of a glacier looming before them, glowing orange in the rising sun. These scientists had spent their lives studying the cryosphere—the frozen part of Earth—but most had never encountered it in person.

NSF Plans to Abolish Divisions

EOS - Fri, 05/09/2025 - 13:12
body {background-color: #D2D1D5;} Research & Developments is a blog for brief updates that provide context for the flurry of news regarding law and policy changes that impact science and scientists today.

The U.S. National Science Foundation (NSF) plans to abolish dozens of divisions across all eight of its directorates and reduce the number of programs within those divisions, according to Science.

A spokesperson for NSF told Science that the reason behind the decision was to “reduce the number of SES [senior executive service] positions in the agency and create new non-executive positions to better align with the needs of the agency.”

Directorates at NSF and the divisions within them oversee grantmaking related to a particular field of science. Current directors and deputy directors will lose their titles and may be reassigned. Division directors play a large role in grantmaking decisions and are usually responsible for giving final approval for NSF awards. 

NSF lists the following directorates and divisions:

  • Directorate for Biological Sciences
    • Biological Infrastructure
    • Environmental Biology
    • Emerging Frontiers
    • Integrative Organismal Systems
    • Molecular and Cellular Biosciences
  • Directorate for Computer and Information Science and Engineering
    • Office of Advanced Cyberinfrastructure
    • Computing and Communication Foundations
    • Computer and Network Systems
    • Information and Intelligent Systems
  • Directorate for Engineering 
    • Chemical, Bioengineering, Environmental and Transport Systems
    • Civil, Mechanical and Manufacturing Innovation
    • Electrical, Communications and Cyber Systems
    • Engineering Education and Centers
    • Emerging Frontiers and Multidisciplinary Activities
  • Directorate for Geosciences
    • Atmospheric and Geospace Sciences
    • Earth Sciences
    • Ocean Sciences
    • Research, Innovation, Synergies and Education
    • Office of Polar Programs
  • Directorate for Mathematical and Physical Sciences
    • Astronomical Sciences
    • Chemistry
    • Materials Research
    • Mathematical Sciences
    • Physics
    • Office of Strategic Initiatives
  • Directorate for Social, Behavioral, and Economic Sciences
    • Behavioral and Cognitive Sciences
    • National Center for Science and Engineering Statistics
    • Social and Economic Sciences
    • Multidisciplinary Activities
  • Directorate for STEM Education
    • Equity for Excellence in STEM
    • Graduate Education
    • Research on Learning in Formal and Informal Settings
    • Undergraduate Education
  • Directorate for Technology, Innovation and Partnerships
    • Regional Innovation and Economic Growth
    • Accelerating Technology Translation and Development
    • Preparing the U.S. Workforce

“The end of NSF and American science expertise as we know it is here,” wrote Paul Bierman, a geomorphologist at the University of Vermont, on Bluesky

 
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The decision to abolish its divisions may be part of a larger restructuring of NSF grantmaking, according to Science.

NSF was already facing drastic changes to its operations from Trump administration directives, including an order to stop awarding new and existing grants until further notice and an order cancelling hundreds of grants related to diversity, equity, and inclusion as well as disinformation and misinformation. Last month, NSF shuttered most of its outside advisory committees that gave input to operations at seven of the eight directorates.

On 8 May, members of the House Committee on Science, Space, and Technology sent a letter to Brian Stone, the acting director of the NSF, expressing distress at the changes at NSF over the past few weeks. 

“So, who is in charge here? How far does DOGE’s influence reach?” members of the committee wrote in the letter. “We seek answers about actions NSF has taken that potentially break the law and certainly break the trust of the research community.”

Layoff notices are expected to be sent to NSF staff members today, as well.

9 May update: On Friday, NSF closed its Division of Equity for Excellence in STEM (EES) and removed the division from its website. EES was responsible for programs that advanced access to science, technology, engineering, and mathematics (STEM) education. In its explanation for the closure, NSF noted that it is “mindful of its statutory program obligations and plans to take steps to ensure those continue.” Division grantees received notice from their program officers about the closure this morning.

An internal memo circulated Thursday and obtained by E&E News stated that NSF will begin a reduction in force (RIF) aimed at its Senior Executive Service. The RIF will also terminate roughly 300 temporary positions.

—Grace van Deelen (@gvd.bsky.social), Staff Writer

These updates are made possible through information from the scientific community. Do you have a story about how changes in law or policy are affecting scientists or research? Send us a tip at eos@agu.org. Text © 2025. AGU. CC BY-NC-ND 3.0
Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.

Senior Scientists Must Stand Up Against Attacks on Research and Education

EOS - Fri, 05/09/2025 - 13:09

Massive cuts in federal funding to schools and science agencies, dogmatic calls to eliminate entire research areas, revocations of visas for international students and scholars, and attacks on academic freedom, speech, and the value of education and expertise—all emanating from recent Trump administration actions—are damaging and reshaping U.S. higher education and scientific institutions. Furthermore, the country’s withdrawals from international treaties (e.g., the Paris Agreement) and organizations (e.g., the Intergovernmental Panel on Climate Change and World Health Organization), and its weakening of programs promoting health, environmental protection, cultural exchange, and peace, diminish U.S. leadership and credibility globally and add to instabilities threatening lives, economies, and security around the world.

The surprising speed and breadth of the attacks and changes have left scientists, educators, and others confused, afraid, and grappling with how to respond.

The surprising speed and breadth of the attacks and changes have left scientists, educators, and others confused, afraid, and grappling with how to respond. The environment of intimidation, uncertainty, isolation, and fear created by the administration has been compounded by the silence or outright capitulation of many leaders and institutions, despite their having firm legal and constitutional protections, in the face of these threats. If sitting Republican senators like Lisa Murkowski (R-Alaska), major universities, law firms, and private companies and foundations are afraid to speak out and defend their values, what can individuals do?

Individuals can organize, and in so doing wield strength in numbers and identify leaders who are well-positioned to raise their voices to push reluctant institutions to act. Within science higher education, senior scientists can and should fill these roles.

Standing Up and Standing Out

The risk calculations for many institutions and individuals in the face of the administration’s swift, illiberal, and authoritarian actions have been clear: It is better to comply than to fight, because fighting risks funding losses, investigations, and lawsuits.

However, as the experiences of some universities, notably Columbia, have demonstrated, submitting to administration demands does not spare institutions from further scrutiny. In Harvard’s case, shortly after the school’s president indicated willingness to engage with the administration about shared concerns, the scope of outrageous demands increased to infringe on its ability to make its own decisions on hiring, enrollment, curriculum, and values, leading the university to sue the administration.

Standing up and standing out are easier said than done, especially considering the very real risks to individuals’ careers, livelihoods, and safety.

Clearly, the balance of risk between compliance and standing up for core principles (not to mention the rule of law) has shifted. As the leaderships of higher education and science institutions weigh how to respond to this shift, their employees, members, and constituent communities can speak up to shape these responses.

What is needed is courage, solidarity, and an intentional and strategic plan of action. Of course, standing up and standing out are easier said than done, especially considering the very real risks to individuals’ careers, livelihoods, and safety. In science and academia, as elsewhere, these risks are greatest for those most vulnerable: students, early-career researchers, and immigrants and international scholars. Therefore, it is incumbent upon senior colleagues—who have outsize privilege, responsibility, and collective power in universities and professional societies—to lead the way.

Reframing the Message

With social media increasingly fueling the spread of misinformation and disinformation and the corporate consolidation and polarization (both real and perceived) of mass media, strategies used in the past to inform reasoned policy discussions no longer work on their own. Scientists’ rational, detailed, and evidence-based arguments used to be effective in influencing policy, but the current administration and its allies have largely disregarded experts and facts in making major decisions.

With this new reality, the messaging from scientists—especially senior scientists from privileged identities—must change. It must be direct and aimed at resisting ongoing actions that are dismantling U.S. scientific and education enterprises; harming students, universities and colleges, and federal research agencies; and degrading public health, foreign policy, the economy, and the rule of law. Simply put, these actions are leading to death and environmental destruction, and they are endangering the national economy.

The dismantling of federal support for HIV and AIDS research and prevention, for example, “will hurt people, will cause people to die, and will cause significant increased costs to all of us throughout the country,” said a former Centers for Disease Control and Prevention official. The numerous rollbacks of major EPA rules and environmental protections will dramatically degrade air and water quality and irreparably harm public health and ecosystems. And the cuts to scientific research will directly affect our ability to advance medical, energy, transportation, space, communication, and infrastructure innovations, undermining the country’s economic strength.

Influencing Institutional Leaders

Senior scientists should be at the vanguard of these fronts, using their influence to protect students and more vulnerable colleagues.

In addition to speaking simply and clearly about the realities of such threats, scientists must come together within their own and across institutions to form united fronts. Senior scientists should be at the vanguard of these fronts, using their influence to protect students and more vulnerable colleagues, U.S. citizens, and international scholars alike.

They should demand that their institutional leaders uphold core values of higher education and science, including inclusion, international cooperation, and ethical and evidence-based research. They should demand that these leaders strengthen mutually beneficial ties among universities and professional societies, urging them, for example, to join mutual defense alliances such as the recently proposed coalition among Big Ten universities and to sign on to the American Association of Colleges and Universities’ “Call for Constructive Engagement” that rebuked the administration’s attacks. And they should demand that instead of capitulating, their institutions bring and support litigation against attempts to suppress academic freedom, free speech, and freedom of association; to unlawfully cancel grants and revoke visas; and to infringe on universities’ independence to develop their own curricula and academic policies. After all, executive orders are unilateral directives, not laws or legislation.

Furthermore, institutions should provide free legal counsel to imperiled international students and researchers and speak loudly and publicly about the meaning and value of academic freedom, the power of diverse and inclusive communities in driving societally valuable innovations, and the incredible returns of investing in modern research universities.

Though these demands are made of our institutional leaders, senior scientists can also act on their own initiative to help defend the higher education and scientific communities and their work from attacks meant to discredit and marginalize them.

Acknowledge and Activate

What can these scientists do? For starters, they can keep up-to-date about the shifting landscape of relevant federal, state, and institutional policies and responses. Many timely resources can help with this. I joined the chapter of the American Association of University Professors (AAUP) at the University of Michigan in Ann Arbor, where I work, for this purpose.

Senior scientists can support early-career colleagues and students by helping them, in turn, stay informed of policy developments, by actively listening to and understanding their concerns, and by providing opportunities for career and community networking and professional development during these uncertain times. Universities frequently offer mentoring resources and tool kits that can help, and programs such as AGU’s Mentoring365 enable connections within and across peer groups. They can also support each other across campuses, and seek allies in other disciplines, recognizing that attacks on the arts, humanities, and STEM (science, technology, engineering, and mathematics) fields are all connected.

Scientists should be contacting and meeting with local, state, and federal elected officials to convey the impacts of funding cuts and attacks on students, scholars, research, and innovations.

Further, scientists should be contacting and meeting with local, state, and federal elected officials. Scientists should use those meetings to convey the impacts of funding cuts and attacks on students, scholars, research, and innovations, citing real examples from their home institutions. At the University of Michigan, for example, scores of grants and contracts (including two of my own) have been canceled or not renewed, either because they were not compliant with administration ideology on DEI (diversity, equity, and inclusion), health equity, or environmental justice, or because of agency program eliminations and budget cuts. These cuts have directly halted student research experiences and led to layoffs and withdrawals of graduate admissions offers.

Although local and state officials cannot directly change federal policy, scientists can help focus their attention on the local impacts of federal actions. Further, these leaders’ concerns often carry a different weight within political decisionmaking. A federal congressperson may respond differently to a state senator from their own political party than they would to the concerns of 10 scientists.

Senior scientists can also work with their professional societies and organizations to file litigation against unjust actions, and provide programming (e.g., career counseling) and financial support (e.g., waived conference registration fees) for students and colleagues directly affected. And if needed, they can push their professional societies to take stronger stances. The powerful statement by the American Academy of Arts and Sciences offers a model that every nonprofit professional society should emulate. Even if institutions or societies have adopted neutrality statements, or are nonprofits prohibited from lobbying activities and whose memberships have diverse views, there is clear rationale to speak out and act against policy changes that directly affect their missions.

In short, senior scientists must acknowledge the severity of the threats to the scientific and higher education communities from the administration’s actions and activate to support local and national efforts to counter the threats. Together with the leaderships of their institutions and professional societies, they must defend these communities—particularly their more vulnerable members—and the value and integrity of the work they do. The stakes are high: Lives and careers are being jeopardized, and brilliant scientists are being driven away. We must act to preserve the American partnership that created diverse, federally supported research universities before the damage is permanent.

Author Information

Mark Moldwin (mmoldwin@umich.edu), University of Michigan, Ann Arbor

Citation: Moldwin, M. (2025), Senior scientists must stand up against attacks on research and education, Eos, 106, https://doi.org/10.1029/2025EO250181. Published on 9 May 2025 2025. This article does not represent the opinion of AGU, Eos, or any of its affiliates. It is solely the opinion of the author(s). Text © 2025. The authors. CC BY-NC-ND 3.0
Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.

Newly Discovered Algae May Speed Melting of Antarctic Ice

EOS - Fri, 05/09/2025 - 13:07

Alex Thomson, an algal ecologist with the Scottish Association for Marine Science, had planned to study coastal blooms of microalgae during his 2023 trip to Robert Island in Antarctica. But after arriving, he and his colleagues made a discovery that would change their mission.

Scientists have known for years that ice in the Arctic is teeming with microscopic algae. But aside from a few scattered observations, nobody knew whether such blooms were widespread in Antarctica’s ice caps (an ice cap is a type of gently domed glacier flowing outward in all directions). Thomson and his colleagues decided to collect a few samples from the Robert Island ice cap while they were there.

Researchers found a diversity of species of Ancylonema, purplish, conical algae that can form in chains. Credit: Alex Thomson

When they got the samples under a microscope, it was clear that the ice was a bustling hub of algal activity. “As we started to uncover this during the field season, we shifted our focus and took what was happening on the ice cap more seriously,” Thomson said.

In a study published in Nature Communications, the researchers revealed the extent and diversity of algae they found inhabiting the ice. Their findings warn that algae, whose pigments absorb heat from the Sun, may be accelerating the melting of Antarctic ice at a rate greater than previously thought.

“It’s the first paper quantifying that process in Antarctica,” said Alexandre Anesio, an Arctic algae expert at Aarhus University in Denmark who wasn’t involved in the new study.

Widespread Blooms and Unexpected Diversity

Scientists sampled from 198 locations and examined WorldView-2 satellite images from February 2023, which revealed darkened patches of ice indicative of algal blooms. On the basis of their sampling and the satellite images, the scientists estimated that algal blooms covered around 20% of the ice cap’s surface.

The newly discovered algal communities may represent one of the largest photosynthetic habitats in Antarctica. Researchers had previously estimated that all detectable photosynthetic life in Antarctica covered approximately 44 square kilometers. The ice cap algal blooms on Robert Island alone were equivalent to about 6% of that area.

“We were seeing this huge morphological diversity, loads of forms of Ancylonema that I’d never seen described in any of the literature.”

The scientists also found a diverse range of species in their samples. The most prevalent genus of ice algae, Ancylonema, has an elongated “sausage shape and can form in chains,” Thomson said. “We were seeing this huge morphological diversity, loads of forms of Ancylonema that I’d never seen described in any of the literature.”

Genetic analysis revealed that the Antarctic ice cap contains Ancylonema species that are similar to those found in the Arctic, but also others that were distinct. Some genetic lineages appear unique to Antarctica, suggesting that these communities may have evolved in isolation over millions of years.

Dark Pigments Accelerate Antarctic Ice Melt

Thomson was excited by the diversity of algae, but said the finding could have troubling implications.

When a researcher on the team used a backpack device that Thomson said “looks a bit like a piece of Ghostbusters apparatus” to measure how much light reflected off the ice’s surface, they discovered that areas of ice containing algae reflect significantly less light than areas without algae. The purple pigment within Ancylonema, which it uses as sunscreen to protect itself from ultraviolet radiation, absorbs more energy and heats the surrounding ice.

“This study gives a big preview of what can happen in Antarctica if you start to have warm summers.”

Through modeling, they found that algae can contribute up to around 2% of the total daily melting on the ice cap. Though the figure isn’t as high as it is in Greenland, where dense blooms can increase melt rates of the ice surface by 13%, scientists are concerned that warmer temperatures may allow more algae to grow, which would cause more heat to be absorbed into the ice caps. “That 2% is probably going to look more similar to Greenland” in the future, Anesio said.

Currently, climate models do not account for microorganisms’ contributions to melting. To Anesio and Thomson, studies like this highlight why that needs to change. “This study gives a big preview of what can happen in Antarctica if you start to have warm summers,” Anesio said.

—Andrew Chapman (@andrewchapman.bsky.social), Science Writer

Citation: Chapman, A. (2025), Newly discovered algae may speed melting of Antarctic ice, Eos, 106, https://doi.org/10.1029/2025EO250174. Published on 9 May 2025. Text © 2025. The authors. CC BY-NC-ND 3.0
Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.

Study of Turkish gold mine landslide highlights need for future monitoring

Phys.org: Earth science - Fri, 05/09/2025 - 08:30
A new analysis of a fatal landslide that occurred on 13 February 2024 at the Çöpler Gold Mine in Turkey reveals that the site of the landslide had been slowly moving for at least four years prior to the failure.

The Role of Gravity in the State of Stress and Pore Pressure of Poroelastic Rocks

Geophysical Journal International - Fri, 05/09/2025 - 00:00
SummaryThe response of porous rocks to fluid flow and external loads is critical to a wide range of geophysical and geotechnical problems, and is described by the long-established theory of poroelasticity. Despite the wealth of literature existing on the subject, little investigation has been devoted to the analysis of the state of stress and pore pressure regimes within porous media under the action of gravity force. Here, we present analytical solutions for the effective stress and pore pressure in gravitationally loaded porous rocks, in both drained and undrained conditions, and compare them with results from Finite Element numerical models. We also apply our models to a ground deformation episode observed in the Campi Flegrei caldera, Italy. We find that the numerical results accurately reproduce our analytical solutions and show how accounting for gravity-induced stress and pore pressure regimes is critical to model stress and deformation in poroelastic media accurately. Specifically, we highlight how failing to assign realistic initial conditions, or neglecting gravity altogether, may lead to misleading results and interpretations of geophysical observables, such as ground deformation and rock failure.

Mapping the near-field scattered energy in sedimentary basins from ambient noise correlations

Geophysical Journal International - Fri, 05/09/2025 - 00:00
SummaryPrecursory spurious arrivals, commonly observed in ambient noise correlations, are generated by near-field noise sources. We have developed an inversion method to evaluate the noise source distribution based on the precursory waves. This method is applied to the BASIN experiment in Los Angeles, revealing that the noise sources show coherent patterns with features like faults and structure boundaries. Our spectral analysis indicates that the energy of the noise source in generating the precursory signal is predominant at higher frequencies, suggesting a shallow source(<200m). We conclude that near-field noise is primarily produced by scattering from geological structures with significant velocity contrasts, such as faults at shallow depths. This method offers a new way to map faults using ambient noise correlations.

Seismic noise characterisation of broadband stations in the Italian region using Power Spectral Density: a frequency, spatial and statistical analysis

Geophysical Journal International - Fri, 05/09/2025 - 00:00
SummaryThere are currently few studies in the literature on source and background seismic noise power distribution in Italy. In this research, the seismic noise recorded by 233 broadband (BB) seismic stations of the Italian Seismic Network (ISN), operating continuously between 2015 - 2018, was investigated. Starting from the average Power Spectral Density (PSD) calculated for each selected station, the seismic noise powers in four subsets from 0.025 to 30 Hz frequency bands were analysed. Using the Inverse Distance Weighted (IDW) interpolation method, the background noise distribution in the entire Italian territory was observed, producing noise interpolation maps for each of the four frequency bands. Furthermore, regional seismic noise models and local anomalies for each subset of the frequency bands were found by applying 2D moving average spatial filtering techniques. In addition, in this research, a first attempt of linear regression analysis is performed to discover possible relationships between seismic noise powers and geographical parameters (elevation site and minimal station-coast distance) and the role of meteorological parameters such as rainfall. The large dataset obtained allowed for the assessment of the main characteristics and sources of seismic noise at all sites. One can thus know the distribution of noise levels in the Italian territory and in particular study their main sources related to natural and anthropic ambient vibrations. To improve the analysis, a comparison between the seismic noise maps and the completeness magnitude map was carried out, which showed the effectiveness of the national seismic network.

NOAA Halts Maintenance of Key Arctic Data at National Snow and Ice Data Center

EOS - Thu, 05/08/2025 - 15:50
body {background-color: #D2D1D5;} Research & Developments is a blog for brief updates that provide context for the flurry of news regarding law and policy changes that impact science and scientists today.

The National Snow and Ice Data Center (NSIDC) may no longer actively maintain or update some of its snow and ice data products after losing support from NOAA’s National Centers for Environmental Information, according to a 6 May announcement.

 
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Data products affected by the decision are used to monitor the impacts of climate change in the Arctic, and include the center’s Sea Ice Index, Gridded Monthly Sea Ice Extent and Concentration, 1850 Onward, and World Glacier Inventory. “All of these data products as well as others in the NOAA@NSIDC collection face uncertain futures without ongoing support,” NSIDC wrote in an email to users posted on Bluesky.

While the data products won’t disappear, they will no longer be maintained at their current levels. 

“This change in support limits our ability to respond quickly to user inquiries, resolve issues, or maintain these products as thoroughly as before,” the NSIDC said in a statement to Inside Climate News

NSIDC, based at the University of Colorado, Boulder, is a prominent polar research institute. Its Sea Ice Index, in particular, has been a crucial source of data for scientists tracking the decline of sea ice cover in the Arctic. The threatened data sets are also used by Alaskan communities for weather prediction, inform fisheries and ecosystem management, and support “countless other Arctic geopolitical and security decision-making needs,” Zack Labe, a climate scientist and former NOAA staff member, told Inside Climate News.

This is horrible. I don't even know what to say. Some of our most key polar data."As a result, the level of services for affected products below will be reduced to Basic—meaning they will remain accessible but may not be actively maintained, updated, or fully supported."nsidc.org/data/user-re…

Zack Labe (@zacklabe.com) 2025-05-06T20:08:25.918Z

The decision to end support of the NSIDC products is the latest in ongoing efforts from the Trump administration to take important environmental data offline, though some nonprofits, scientists, and advocacy groups are working to recreate some of the lost data tools. 

A NOAA webpage lists data products that have been decommissioned since President Trump took office, including data from marine monitoring buoys, coastal ecosystem maps, seafloor data, and satellite data tracking hurricanes. In a 21 April announcement, the University-National Oceanographic Laboratory System, a group that coordinates U.S. ocean research, suggested that those interested in salvaging data products planned for decommissioning in 2025 should nominate those datasets for backup by the Data Rescue Project, a volunteer archiving effort.

NSIDC is asking scientists and educators who rely on these data products and would like to demonstrate the importance of these data sets to share their stories at nsidc@nsidc.org.

—Grace van Deelen (@gvd.bsky.social), Staff Writer

These updates are made possible through information from the scientific community. Do you have a story about how changes in law or policy are affecting scientists or research? Send us a tip at eos@agu.org. Text © 2025. AGU. CC BY-NC-ND 3.0
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Study reveals all of the biggest US cities are sinking: Groundwater pumping is the main cause in most

Phys.org: Earth science - Thu, 05/08/2025 - 15:11
A new study of the 28 most populous U.S. cities finds that all are sinking to one degree or another. The cities include not just those on the coasts, where relative sea level is a concern, but many in the interior. Furthermore, using newly granular data, the study finds that some cities are sinking at different rates in different spots, or sinking in some places and rising in others, potentially introducing stresses that could affect buildings and other infrastructure.

Satellites observe glacier committing 'ice piracy'

Phys.org: Earth science - Thu, 05/08/2025 - 15:04
A glacier in Antarctica is committing "ice piracy"—stealing ice from a neighbor—in a phenomenon that has never been observed in such a short timeframe, say scientists.

Protecting Iceland's towns from lava flows—with dirt

Phys.org: Earth science - Thu, 05/08/2025 - 14:19
It had been dormant for 800 years, but in March 2021, the Fagradalsfjall volcano in Iceland came to life. While the eruption was ongoing, large-scale field experiments were conducted to build defensive earthen barriers aimed at slowing down the molten lava flow.

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