Articles tagged with Biogeochemistry
New research suggests that Agulhas Leakage does not directly regulate the AMOC through salt transport, challenging a long-held textbook concept. Instead, changes in ocean temperature and thermocline structure play a crucial role in shaping the climate system.
Scientists used chemical clues in microscopic fossils to find evidence that ocean acidification caused one of the largest extinction events in planktic foraminifera history. The study suggests that volcanic eruptions and rising CO2 levels led to a decrease in shell-building ability, ultimately contributing to the extinction.
Researchers have discovered that microorganisms actively contribute to mineral formation on the ocean floor, using compounds such as sulfate and sulfur to promote pyrite formation. The study reveals a complex interplay between biological and geological processes at the ocean floor.
A new study reveals that a small group of highly connected microorganisms helps maintain essential ecosystem functions, such as carbon and nitrogen cycling, despite major shifts in the wider microbial community. The research found functional redundancy, where different microorganisms can perform similar ecological roles.
A comprehensive study analyzed data from 429 Chinese lakes, revealing how climate and nutrient pollution influence dissolved organic matter and greenhouse gas emissions. The research found that arid environments have higher DOM concentrations and that extreme weather events stimulate their accumulation.
Researchers found that both free water and bound water slowed the intensity of pyrolysis reactions and increased biochar yield. A biomass water content of around 30% may offer a practical balance for pyrolysis, balancing biochar yield and energy demand.
Dissolved black carbon's colloidal behavior can decide whether carbon and associated contaminants travel long distances or become trapped in sediments. Understanding this behavior is essential for predicting environmental risks and carbon cycling.
A new study found that even as oak trees continue to photosynthesize late into the year, their growth stops by mid-summer. This decoupling between photosynthesis and growth suggests that increased carbon uptake may not translate to greater wood production, reducing long-term carbon storage in forests.
A new study found that biochar can lower the temperature sensitivity of nitrous oxide emissions in agricultural soil but increase it in forest soil. Researchers tested different soils and biochar treatments and found that temperature was the dominant driver of nitrous oxide emissions, while biochar acted as a secondary modulator.
A new study reveals how combining crop straw with biochar may help soils build humic substances that are both chemically active and structurally persistent. The research found that straw and biochar do more than just add carbon to soil, reorganizing the molecular building blocks of humic acid.
False-negative results may lead to overlooking environments that could harbor life beyond current detection capabilities. Researchers emphasize the need for targeted research strategies, combining laboratory experiments with modeling research and fieldwork to address these risks.
Researchers found that biochar can either dampen or amplify temperature sensitivity of nitrous oxide emissions in soils. Biochar's effects depend on soil properties and environmental conditions.
A new study reveals that declining floating-leaf plants release harmful nutrients, but also trigger a microbial process that converts simple organic matter into resilient, long-term carbon storage. This process enhances the lake's ability to sequester carbon through a microbial carbon pump.
A recent study reveals that Alaskan permafrost is thawing rapidly, leading to increased runoff, carbon releases, and altered coastal ecosystems. The research focused on a Wisconsin-sized area of Alaska's North Slope, simulating daily river flows and coastal exports over 44 years.
A new study reveals that deep-sea microbes like Nitrosopumilus maritimus can adapt to warmer, nutrient-poor waters, maintaining their role in nitrogen cycling and primary production. This finding suggests that these microbes may play an important role in reshaping ocean-nutrient distribution in a changing climate.
Early land plants began reshaping Earth's surface environments approximately 455 million years ago, boosting organic matter production on land. This increased terrestrial photosynthesis led to elevated organic carbon-to-phosphorus ratios in marine sediments, indicating a significant impact on the Earth system.
A UT San Antonio-led research team identified chitin in trilobite fossils over 500 million years old, offering new insights into fossil preservation and the long-term carbon cycle. This discovery has significant implications for understanding how organic carbon is stored in Earth's crust over geologic time.
Researchers propose a new framework called mechano biogeochemistry, suggesting that natural mechanical forces can be converted into electrical energy through the piezoelectric effect. This process allows microbes to grow and carry out chemical reactions even in the absence of sunlight or traditional chemical fuels.
Dr. Corday Selden has made fundamental contributions to our understanding of how marine microbial interactions structure the chemistry of the ocean. Her pioneering research has reshaped the understanding of nitrogen cycling, microbial metabolism, and biosphere–geosphere interactions.
Researchers found that biochar can soften the impacts of swings between wet and dry conditions on soil organic carbon breakdown. The study showed that stronger moisture variability speeds up decomposition and boosts microbial activity, but biochar addition helped stabilize the soil system under variable moisture conditions.
Researchers used clumped-isotope palaeothermometry to reconstruct large temperature fluctuations at depths of up to 4,000 meters in the Southern Ocean. These fluctuations occurred simultaneously with changes in oxygen isotopes and Earth's orbital eccentricity, suggesting a climatic forcing.
A new study reveals that microbialites in South Africa are thriving, growing up to 2 inches vertically every year. They absorb carbon day and night through metabolic processes, making them one of the most efficient biological mechanisms for long-term carbon storage observed in nature.
Researchers found that warming temperatures may actually reduce nitrogen gas emissions from forest soils in dry conditions, contradicting earlier predictions. The study's findings suggest that moisture levels, not just heat, play a crucial role in determining the fate of nitrogen in forests.
Researchers at the University of Alberta have found evidence of abiotic nitrogen reduction, a reaction driven by minerals as catalyst, which likely produced necessary nutrients for life. This discovery sheds light on the faint young sun paradox and provides a key piece to understanding how life may have emerged on Earth.
Researchers found that tropical forests may be less sensitive to climate change than thought. They discovered that dead leaves cool nearby leaves by reflecting more sun energy, reducing heat buildup.
Research reveals that microorganisms in ocean hypoxic zones convert nitrate into nitrous oxide to generate energy, producing this climate-damaging gas. The study's findings suggest that organic material in these zones increases the oxygen tolerance of bacteria, allowing for more regions of nitrous oxide production.
A new study found that different types of char can raise or lower greenhouse gas emissions from northern soils. Biochar tends to increase nitrous oxide emissions, while hydrochar suppresses it and even turns the soil into a small sink.
Researchers found that terrestrial-derived organic matter, primarily lignin, fuels microbial reactions leading to increased greenhouse gas emissions. However, as salinity increases upon approaching the sea, microbial activity slows down, reducing emissions and mitigating the effects of climate change.
Climate models oversimplify the role of calcifying plankton in capturing and cycling carbon, potentially underestimating the ocean's capacity to respond to climate change. Ignoring these organisms' diversity risks oversimplifying how the ocean responds to climate stressors.
Researchers propose a new model for Earth's oxygenation, finding that high nickel and urea concentrations kept cyanobacterial blooms rare. As these compounds became available at lower levels, they drove the expansion of cyanobacteria, leading to long-term oxygen release and the Great Oxidation Event.
In a new study, researchers from Umeå University found that ice at minus ten degrees Celsius releases more iron from common minerals than liquid water at four degrees Celsius. Repeated freeze-thaw cycles increase dissolution, releasing organic compounds and fuelling further chemical reactions.
A new method reconstructs carbon dioxide levels and photosynthesis from fossilized tooth enamel, shedding light on the climate of the Mesozoic era. The analysis found that atmospheric CO2 levels were four times higher in the late Jurassic period and three times higher in the late Cretaceous period than they are today.
Dr. Ilya Bobrovskiy's research aims to improve understanding of ancient habitats' carbon cycles, tracking coevolution of life and environments. He will analyze rocks using organic geochemistry, isotope geochemistry, and paleontology.
Researchers in Svalbard encounter exceptionally high temperatures, widespread snowmelt, and blooming vegetation, challenging the long-held assumption of a reliably frozen Arctic winter. This finds underscores the transformative impact on physical environment, local ecosystems, and scientific research methodology.
Research presents fig tree species storing calcium carbonate in trunks, converting CO2 from atmosphere. The oxalate-carbonate pathway increases soil pH and nutrient availability, making it a potential means to mitigate CO2 emissions.
A groundbreaking study reveals that small zooplankton like copepods and krill enhance carbon sequestration through seasonal migrations. These tiny creatures store around 65 million tonnes of carbon annually in the deep ocean.
A study by Göttingen University researchers combined satellite data with manual measurements to better understand forest soil moisture. The findings show that soil moisture is strongly influenced by weather and season, not exact location, and highlight the importance of monitoring soil moisture over time for effective forest management.
The MARUM-QUEST 5000 successfully tested its system and took samples during a dive at the Menez Gwen hydrothermal field at 830 meters. The new ROV replaces the MARUM-QUEST 4000 and offers improved payload capacity, control technology, and gripper arms for deep-sea observations.
Researchers warn that artificial oxygen input cannot replace comprehensive water protection strategies. Technical approaches have shown promise, but risks include intensifying greenhouse gases and disrupting marine habitats. Climate protection and reducing nutrient inputs remain crucial for mitigating ocean oxygen loss.
The Arctic Great Rivers Observatory, a multinational project founded at the Marine Biological Laboratory, has been recognized as a National Champion by the Frontiers Planet Prize for its publication on recent trends in the chemistry of major northern rivers. This recognition highlights the value of sustained international collaboration...
A new study on natural oil seeps in the deep sea has found that hydrothermal processes mobilize dissolved organic matter, influencing local ecosystems and the global marine carbon cycle. The composition of released water-soluble organic molecules is strongly influenced by temperature and petroleum composition.
Researchers developed a method to track large herbivore movements using strontium isotope ratios in tooth enamel. They analyzed Misha, a zoo elephant, and found her teeth revealed relocation history from California to Utah.
A new study led by University of Maryland geologist Sujay Kaushal finds that multiple threats are making fresh water saltier, including land-based pollution and saltwater intrusion. The researchers offer a framework for predicting and preventing the issue, which affects ecosystems, agriculture, and drinking water supplies.
Researchers will focus on novel non-plastic materials used for oyster reef restoration, evaluating their impact on surrounding marine habitats. The project aims to find solutions that bring the natural environment back after degradation from storms or human impact.
A new integrated method simplifies luminescence lifetime measurements, allowing researchers to determine lifetimes using standard camera systems. This breakthrough technique transforms fields that rely on optical sensing and chemical imaging.
Researchers discovered that certain bacteria can utilize methane to grow and generate energy, preventing its release into the atmosphere. These microorganisms, known as methanotrophs, are essential for controlling methane emissions and regulating the global climate.
A new study found that urban moss in older Portland neighborhoods has up to 600 times higher lead levels than rural areas, with concentrations linked to old telecommunications cables. The findings raise concerns about lead exposure and recommend avoiding soil disturbance in affected areas.
A new model integrating soil microbes and large perennial grasses into the DayCent framework improves its representation of ecosystem dynamics. The updated model includes a live microbial biomass pool and dead microbial biomass pool to simulate carbon storage in soils, enhancing the evaluation of bioenergy crop sustainability.
Researchers developed a new model incorporating genetic information from microbes to better understand soil carbon sequestration and plant-microbe interactions. This approach enables more accurate prediction of global carbon cycle changes in climate models, informing agricultural strategies to preserve carbon and mitigate climate change.
Researchers have uncovered evidence of complex microbial communities existing in ecosystems over 3 billion years ago, with a diverse carbon cycle involving various microorganisms. The study provides a rare glimpse into the Earth's early ecosystems and advances our understanding of ancient microbial ecosystems.
Researchers analyzed dolomite rocks and found a high proportion of C-13, indicating strong methane formation by microorganisms in water with low sulphate content. The sediment's chemical development is controlled by crater floor cooling and water supply, not climatic changes.
Researchers are working to better understand and reduce the health risks associated with mercury use in artisanal and small-scale gold mining. A new approach has been piloted, which can help reduce mercury emissions in these mines.
Scientists discover new sulfur cycle mechanism in Lake Superior's ancient waters, highlighting the crucial role of organic sulfur compounds. The findings provide insight into how sulfur was cycled in Earth's oceans billions of years ago.
The 2024 Ocean Sciences Meeting brings together 5,000 scientists to discuss breaking research and critical issues affecting ocean sustainability. The biennial event will feature an online-only scientific session on Wednesday 21 February.
Scientists have found evidence of past oxygen loss in the world's oceans during glacial periods, indicating that current climate change may not be permanent. The discovery was made by analyzing seafloor sediments from the past 145,000 years, which showed a build-up of cobalt during the last ice age.
A new UCF project aims to examine a method to keep carbon from escaping soils and trapping heat in Earth's atmosphere. Researchers will focus on histosols in the Everglades Agricultural Area, adding fine minerals to prevent carbon release.
Researchers from Macquarie University have found that the Earth's gradual cooling led to a flip in the deep cycling of carbon and chlorine between the surface and interior. Most carbon accumulates into solid carbonate sediments, while chlorine typically returns to the surface as volcanic gases.
Researchers developed a new method to estimate soil organic carbon stocks in agricultural fields, reducing the number of samples needed by 30%. The approach uses doubly balanced sampling and accounts for auxiliary information available in elevation maps, satellite images, and previous surveys. By improving soil sampling efficiency, thi...
A groundbreaking study finds that microbial life can exist without plate tectonics, challenging a fundamental theory of geology. Zircon crystals from the Barberton Greenstone Belt reveal a stagnant lid regime on ancient Earth, leading to continent formation and potentially habitable conditions.
A team of scientists has discovered ancient groundwaters harbor diverse microbial communities producing large amounts of 'dark oxygen'. This process enables microbes to survive and potentially consume methane, a greenhouse gas. The study's findings challenge prior assumptions about microbial life in subsurface ecosystems.