Science
Separating out signals recorded at the seafloor
Roger Bryant and David Fike’s research reveals that pyrite sulfur isotopes mainly reflect local conditions, shifting fundamental understanding of oceanic environmental studies.
Newswise — Blame it on plate tectonics. The deep ocean is never preserved, but instead is lost to time as the seafloor is subducted. Geologists are mostly left with shallower rocks from closer to the shoreline to inform their studies of Earth history.
Signals from the Sea
“We have only a good record of the deep ocean for the last ~180 million years,” said David Fike, the Glassberg/Greensfelder Distinguished University Professor of Earth, Environmental, and Planetary Sciences in Arts & Sciences at Washington University in St. Louis. “Everything else is just shallow-water deposits. So it’s really important to understand the bias that might be present when we look at shallow-water deposits.”
One of the ways that scientists like Fike use deposits from the seafloor is to reconstruct timelines of past ecological and environmental change. Researchers are keenly interested in how and when oxygen began to build up in the oceans and atmosphere, making Earth more hospitable to life as we know it.
For decades they have relied on pyrite, the iron-sulfide mineral known as “fool’s gold,” as a sensitive recorder of conditions in the marine environment where it is formed. By measuring the bulk isotopic composition of sulfur in pyrite samples — the relative abundance of sulfur atoms with slightly different mass — scientists have tried to better understand ancient microbial activity and interpret global chemical cycles.
But the outlook for pyrite is not so shiny anymore. In a pair of companion papers published Nov. 24 in the journal Science, Fike and his collaborators show that variations in pyrite sulfur isotopes may not represent the global processes that have made them such popular targets of analysis.
Instead, Fike’s research demonstrates that pyritte responds predominantly to local processes that should not be taken as representative of the whole ocean. A new microanalysis approach developed at Washington University helped the researchers to separate out signals in pyrite that reveal the relative influence of microbes and that of local climate.
For the first study, Fike worked with Roger Bryant, who completed his graduate studies at Washington University, to examine the grain-level distribution of pyrite sulfur isotope compositions in a sample of recent glacial-interglacial sediments. They developed and used a cutting-edge analytical technique with the secondary-ion mass spectrometer (SIMS) in Fike’s laboratory.
“We analyzed every individual pyrite crystal that we could find and got isotopic values for each one,” Fike said. By considering the distribution of results from individual grains, rather than the average (or bulk) results, the scientists showed that it is possible to tease apart the role of the physical properties of the depositional environment, like the sedimentation rate and the porosity of the sediments, from the microbial activity in the seabed.
“We found that even when bulk pyrite sulfur isotopes changed a lot between glacials and interglacials, the minima of our single grain pyrite distributions remained broadly constant,” Bryant said. “This told us that microbial activity did not drive the changes in bulk pyrite sulfur isotopes and refuted one of our major hypotheses.”
“Using this framework, we’re able to go in and look at the separate roles of microbes and sediments in driving the signals,” Fike said. “That to me represents a huge step forward in being able to interpret what is recorded in these signals.”
In the second paper, led by Itay Halevy of the Weizmann Institute of Science and co-authored by Fike and Bryant, the scientists developed and explored a computer model of marine sediments, complete with mathematical representations of the microorganisms that degrade organic matter and turn sulfate into sulfide and the processes that trap that sulfide in pyrite.
“We found that variations in the isotopic composition of pyrite are mostly a function of the depositional environment in which the pyrite formed,” Halevy said. The new model shows that a range of parameters of the sedimentary environment affect the balance between sulfate and sulfide consumption and resupply, and that this balance is the major determinant of the sulfur isotope composition of pyrite.
“The rate of sediment deposition on the seafloor, the proportion of organic matter in that sediment, the proportion of reactive iron particles, the density of packing of the sediment as it settles to the seafloor — all of these properties affect the isotopic composition of pyrite in ways that we can now understand,” he said.
Importantly, none of these properties of the sedimentary environment are strongly linked to the global sulfur cycle, to the oxidation state of the global ocean, or essentially any other property that researchers have traditionally used pyrite sulfur isotopes to reconstruct, the scientists said.
“The really exciting aspect of this new work is that it gives us a predictive model for how we think other pyrite records should behave,” Fike said. “For example, if we can interpret other records — and better understand that they are driven by things like local changes in sedimentation, rather than global parameters about ocean oxygen state or microbial activity — then we can try to use this data to refine our understanding of sea level change in the past.”
Source: Washington University in St. Louis
The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/
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Lifestyle
National Recycling Day: Easy, Fun and Good for the Environment
How to make every day recycling day
(Family Features) With so many mixed messages, recycling can feel confusing, but the truth is simpler than you might think. Recycling isn’t just for today – it’s a year-round commitment to a healthier planet.
In honor of National Recycling Day, consider these facts about recycling from the experts and tips to make a difference.
Recycling Is Real
Americans recycle more than 6 billion pounds of plastic every year. Among the plastics recycled, polyethylene terephthalate (PET) remains a responsible material choice. PET is the world’s most recycled plastic, with more than 1.8 billion pounds of PET bottles and containers recovered in the U.S. annually. Since PET bottles can be made from 100% post-consumer recycled content, each recycled bottle contributes to a circular economy where materials are continuously reused instead of wasted.
Recycling PET Plastic is Better for the Environment
Countless others from academics, researchers and industry experts show plastics, such as PET specifically, often have a lower environmental impact. In fact, glass bottles produce three times the greenhouse gas emissions compared to PET bottles, and making an aluminum can produces twice the emissions, according to Life Cycle Assessment studies. Producing PET also uses less energy and water and lowers acid rain and smog potential. Using and recycling PET is a more responsible, more eco-friendly choice than banning plastic outright.
Recycling Saves Energy
Recycling PET bottles requires less energy than producing new glass bottles or aluminum cans. Every PET bottle you recycle helps conserve resources and supports a more responsible production cycle.
Not All Plastics are Created Equal
PET is a superstar among plastics because it can be recycled repeatedly without losing strength or quality. It’s also an inexpensive, lightweight and shatter-resistant package that preserves and protects the food and medicine people place in their bodies.
Recycling Can be Easy
Recycling services can be accessible, with many communities across the U.S. offering easy ways to recycle. Today more than 73% of all U.S. households have access to recycling, according to The Recycling Partnership.
By staying informed, choosing packaging that’s easily recyclable and recycling consistently, you can help build a more sustainable future every day. Visit recyclecheck.org to find out where you can recycle in your community.
5 Recycling Tips
- Know your plastics. Look for the No. 1 recycling symbol – inside three arrows forming a triangular shape – to identify polyethylene terephthalate (PET), helping ensure your recycling efforts are impactful.
- Recycle PET plastic packaging over bans. Choose products packaged in PET bottles where possible, as recycling PET reduces reliance on resource-heavy materials and greenhouse gas emissions.
- See recycling as energy conservation. PET bottle recycling uses significantly less energy compared to producing new glass bottles or aluminum cans.
- Think of recycling as an investment. Every PET container you recycle contributes to a circular economy and more sustainable world.
- Get involved within your community. Connect with local recycling programs and stay updated on your area’s recycling guidelines by visiting recyclecheck.org.
Photo courtesy of Shutterstock
SOURCE:
Amcor Rigid Packaging
Our Lifestyle section on STM Daily News is a hub of inspiration and practical information, offering a range of articles that touch on various aspects of daily life. From tips on family finances to guides for maintaining health and wellness, we strive to empower our readers with knowledge and resources to enhance their lifestyles. Whether you’re seeking outdoor activity ideas, fashion trends, or travel recommendations, our lifestyle section has got you covered. Visit us today at https://stmdailynews.com/category/lifestyle/ and embark on a journey of discovery and self-improvement.
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Space and Tech
NASA Coverage of the Upcoming Progress 90 Cargo Resupply Mission
Excitement is building as NASA prepares for the upcoming launch of the Progress 90 spacecraft, a critical mission that will deliver essential supplies to the crew aboard the International Space Station (ISS). With a launch scheduled for 7:22 a.m. EST on Thursday, November 21, from the Baikonur Cosmodrome in Kazakhstan, this unpiloted Roscosmos cargo spacecraft will transport nearly three tons of food, fuel, and vital equipment to the Expedition 72 crew.
Tune In for Live Coverage
NASA is offering live launch coverage starting at 7:00 a.m. EST on the day of the launch, available on NASA+ and their official website. This is a fantastic opportunity for space enthusiasts and curious minds alike to witness firsthand the relentless efforts of international space collaboration. Not sure how to catch the excitement? NASA has made it easy! Their live coverage can be accessed through various platforms, including social media, so you won’t miss a moment of this thrilling event.
Mission Timeline
Following the launch, the Progress 90 spacecraft will embark on a two-day journey to the ISS, a remarkable feat of engineering and logistics. It is scheduled to autonomously dock at the space-facing port of the Poisk module on Saturday, November 23, at 9:35 a.m. EST. Make sure to tune in for NASA’s coverage of the docking process, which will begin at 8:45 a.m. that same day. Observing the intricate choreography of rendezvous and docking showcases the ingenuity of modern space missions.
Before Progress 90 arrives, it’s important to note that the previous Progress 88 spacecraft will undock from the Poisk module on Tuesday, November 19. Although NASA will not stream this undocking event, it marks another step in efficient cargo operations at the ISS.
What Happens Next?
Once docked, the Progress 90 spacecraft will remain attached to the ISS for approximately six months, providing continuous support to the crew. When it completes its mission, the spacecraft will carry away any used supplies and cargo, ensuring a tidy and efficient living environment aboard the station. It will then safely re-enter Earth’s atmosphere, disposing of invaluable trash generated during the mission.
The Role of the ISS in Space Exploration
For over 24 years, NASA has played a key role in maintaining a continuous human presence in low Earth orbit, enabling groundbreaking research and scientific exploration that simply cannot be achieved on our home planet. The ISS serves as a unique laboratory that allows for experiments in microgravity, helping scientists make discoveries that will not only benefit life on Earth but also pave the way for future space exploration.
The station is poised to support NASA’s ambitious goals for the Artemis program, which aims to return humans to the Moon and expand our presence in the solar system. Ultimately, this sustained effort will guide us toward the dream of human exploration of Mars.
Join the Journey!
As we look forward to another exciting chapter in space travel with the Progress 90 mission, we encourage everyone to join the conversation. Share your thoughts, watch the launch, engage with fellow enthusiasts online, and marvel at the boundaries that humanity is pushing through science and collaboration. Space is within our reach, and every mission takes us one step closer to understanding our universe!
Together, let’s celebrate the spirit of exploration and the collaborative advances in human innovation that make missions like this possible. See you on launch day! 🌌🚀✨
Get breaking news, images and features from the space station on Instagram, Facebook, and X.
Learn more about the International Space Station, its research, and its crew, at:
The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/
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The Earth
5 Sustainable Agriculture Practices for Long-Term Success
Implementing sustainable practices aimed at sequestering carbon, or carbon farming, can help farmers and ranchers increase their bottom line while managing environmental impact in numerous ways, including keeping the soil covered year-round, reducing or eliminating tillage and effectively managing range and pasture lands.
Sustainable Practices
(Family Features) Implementing sustainable practices aimed at sequestering carbon, or carbon farming, can help farmers and ranchers increase their bottom line while managing environmental impact in numerous ways, including keeping the soil covered year-round, reducing or eliminating tillage, and managing range and pasture lands. Carbon farming practices help farmers and ranchers reap the proven benefits of a conservation approach. That, combined with a new revenue stream available via voluntary carbon programs, offers the potential for better outcomes.
Of the Earth’s land surface, 38% is used for agriculture. Capturing carbon in the soil is an affordable and scalable way to cut greenhouse gas emissions in the atmosphere while nurturing healthy, secure and sustainable food systems. Through soil carbon sequestration, farmers and ranchers can become leaders in limiting the effects of climate change while enriching the land’s livelihood.
Implementing practices that meet operational needs, and ultimately sequester carbon to generate carbon credits, allows ranchers and farmers to create additional income, lower future management costs and improve soil health, resulting in enhanced yields, cost savings and more resilient, healthy fields and pastures.
Working closely with farmers and ranchers across the United States, Agoro Carbon Alliance helps implement sustainable practices like these, which bolster natural soil fertility and can also generate carbon credits and new revenue streams.
- No-Till and Reduced-Till Farming: Reducing or eliminating tillage minimizes disruption to the soil and reduces carbon emissions. When soil is tilled, it releases carbon stored within the ground into the atmosphere. Moving an operation to reduced till or no-till practices not only offers benefits to soil quality but can also play a role in mitigating soil erosion, as well as reducing fuel and labor costs.
- Cover Crops: Cover crops improve soil health and help keep carbon “locked in” while preventing nutrient loss and erosion in fields. Developing an effective and profitable cover crop strategy is one way farmers partner with Agoro Carbon Alliance. Backed by a team of highly trained agronomists that collaborate with producers, their team of local agronomists work one-on-one with producers to build a cover crop strategy that best suits each unique operation and keeps soil thriving year-round.
- Interseeding: A related and valuable approach to soil protection and carbon sequestration is interseeding. This occurs when a new crop is planted as a cover or companion in a field where an existing crop has reached vegetative growth. Interseeding increases the number of plants in the soil, resulting in more roots, which promote more efficient biomass and carbon sequestration.
- Rotational Grazing and Grazing Management: Controlling livestock grazing patterns can be advantageous for animal health, as well as the soil and pasture quality. Moving animals from one pasture to another on a systematic basis provides greater control over the quality of the forage, allowing plants to deepen root systems, which enhances the soil’s biomass and supports more efficient carbon sequestration. Rotational grazing also prevents the soil from becoming excessively compacted by animal movement and allows ranchers to distribute natural manure fertilization more evenly.
- Nitrogen Management: Strategically managing how and when nitrogen fertilizer is applied can both increase crop efficiency and yield potential while reducing environmental impacts associated with nitrogen fertilizers. Judicious use of nitrogen-containing fertilizers can help optimize carbon storage, boost yield potential and improve forage.
Soil conservation practices can drive productivity and add a new revenue stream for farm and ranch operations, as well as generate carbon credits. Learn more about sustainable agriculture and carbon cropping at agorocarbonalliance.com.
SOURCE:
Agoro Carbon Alliance
Our Lifestyle section on STM Daily News is a hub of inspiration and practical information, offering a range of articles that touch on various aspects of daily life. From tips on family finances to guides for maintaining health and wellness, we strive to empower our readers with knowledge and resources to enhance their lifestyles. Whether you’re seeking outdoor activity ideas, fashion trends, or travel recommendations, our lifestyle section has got you covered. Visit us today at https://stmdailynews.com/category/lifestyle/ and embark on a journey of discovery and self-improvement.
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