New measurements show that human-induced carbon dioxide emissions have penetrated deep into the North Atlantic, altering the ocean's isotopic signature. The Suess effect is detectable in nearly all North Atlantic water masses, with strongest signals in young, subsurface waters.
High-resolution sediment samples off the coast of Brazil show that the Atlantic Meridional Overturning Circulation was more dynamic than previously thought during the Heinrich Event. The circulation was strengthened in two periods, impacting tropical precipitation patterns and carbon storage in the ocean.
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 study reveals that natural cooling of coral reefs varies with large-scale climate oscillations, including ENSO and IOD. Coral skeletons provide a record of past subsurface temperatures and biological responses to heat stress, highlighting the dynamic relationship between climate refuges and their effectiveness in protecting corals fr...
A recent study reveals that human-induced sea level rise has significantly increased the frequency of storm surge events, with a fourfold increase in historical 100-year events. This shift is largely attributed to rising sea levels, which now occur every eight years rather than once every century.
A new study finds that water masses from the Southern Hemisphere have been a major contributor to the Indonesian Throughflow for over 800,000 years. The researchers measured nitrogen isotopes in sediment cores and found a remarkable long-term stability of the nitrogen cycle along the equatorial Pacific.
Researchers track ancient carbon's path in sea and its uptake by microorganisms, revealing a 30% biomass share. Photosynthesis also plays a role in assimilating hydrothermal carbon, but only a small proportion remains in the local ecosystem.
An international team has successfully documented and sampled freshened water within a zone nearly 200 metres thick beneath the ocean floor. This discovery sheds light on offshore freshened groundwater systems and their relevance to coastal communities relying on groundwater for freshwater supply.
A new study using fossil coccoliths suggests the North Atlantic was 9 degrees Celsius cooler than previously thought during the Miocene epoch. This finding challenges the extreme high-latitude warmth paradigm and aligns with existing climate models for this period.
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.
The study found that organic materials in sediments decompose under supercritical conditions, releasing hydrogen molecules. This process is a more significant source of dissolved hydrogen in the ocean than previously believed.
Researchers found three major vent areas aligned with active fault zones, controlled by the island's tectonic fabric. The discovery establishes Milos as a natural laboratory for studying hydrothermal activity, volcanism, and tectonics.
Researchers used lipid biomarker analyses to study survival strategies of microorganisms in extreme deep-sea ecosystems. They found that methane- and sulfate-metabolizing microbes can thrive in environments with high pH values and low organic carbon concentrations.
Researchers found that hydrothermal systems release iron that can be transported far beyond vent sites through environmental parameters and plume chemistry. This process has significant consequences for ocean productivity and the global carbon cycle.
The study reveals that the Patagonian ice sheet underwent periods of expansion and contraction, contrary to earlier assumptions. The driving force for long-term fluctuations was found to be changes in summer seasons and solar radiation, known as integrated summer energy.
A study has found that high-latitude phytoplankton communities responded to a pre-PETM warming event, highlighting the importance of examining background intervals in determining ecosystem change. The results suggest even small environmental changes can have dramatic impacts on marine ecosystems.
A new study suggests that the Earth's carbon cycle can overcorrect and plunge the planet into an ice age if greenhouse gas emissions continue to rise. The researchers found that in a warmer world with enhanced algae growth, the oceans lose oxygen, leading to a feedback loop that consumes more carbon.
Dr. Tanja Stratmann's project investigates how deep-sea sponges have processed nitrogen since ancient times, influencing their ecosystems and shaping past environmental conditions. The study uses incubation chambers and fossilized sponges to determine the role of sponges in past ocean environments.
A team of researchers analyzed sediment cores from the Indian Ocean, revealing that intensive agriculture led to severe soil erosion around 500 years ago. This finding indicates a profound impact of human activities on the environment much earlier than previously believed.
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 used benthic foraminifera to study the link between Atlantic Meridional Overturning Circulation (AMOC) strength and oxygen content in the eastern tropical North Atlantic. The study found that weaker AMOCs are associated with more oxygen in the oxygen-minimum zone, which has implications for marine ecosystems.
The Global Declaration of Commitment for Scientific Ocean Drilling aims to promote global cooperation and collaboration in ocean science. The declaration sets out core principles for transparent access to data and samples, inclusive participation, environmental responsibility, and alignment with the UN SDGs.
A new study predicts that limiting warming to 1.5°C could preserve over half of the world's glacier mass, but even at this level, 39% of glacier mass would still disappear due to delayed climate change reactions.
The ECORD event will explore the importance of scientific ocean drilling in understanding Earth's systems and addressing environmental challenges. Key findings include the establishment of the new International Ocean Drilling Programme (IODP3) and its potential impact on global scientific cooperation.
Scientists on IODP³-NSF Expedition 501 aim to validate hypotheses about water origin and better understand offshore aquifer systems. The expedition will collect sediment samples and water from beneath the ocean floor, shedding light on the dynamics of these groundwater systems.
A new study has uncovered previously hidden patterns of plankton adaptation in response to environmental changes. The analysis showed that plankton lipid profiles are closely linked to their environment, with adaptations including shortening fatty acid chains in cold polar oceans.
A groundbreaking expedition aims to validate hypotheses about the origin of freshened groundwater in offshore aquifers. Researchers will collect sediment and water samples from beneath the ocean on the New England Shelf, shedding light on the dynamics of these systems and their influence on nutrient and element cycling.
Researchers discovered that soil carbon turnover accelerates rapidly in response to temperature increases, releasing more CO2 than previously thought. This finding has significant implications for the future of atmospheric CO2 concentrations and highlights the need to revise soil sensitivity in climate models.
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.
A study found that microorganisms using the reductive tricarboxylic acid cycle dominate in shallow-water hydrothermal systems. This energy-efficient process enables them to transfer carbon into organic molecules, allowing them to survive in harsh conditions.
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.
Climate change impacts Arctic coastal ecosystems through melting glaciers, altering kelp growth and elemental composition. Kelps are highly susceptible to changes in run-off intensities, leading to increased metal concentrations and negative ecological consequences.
Researchers found a synchronization between geological climate archives and large-scale volcanic eruptions in the Deccan Traps, which may have caused mass extinctions. The study suggests that changes in Earth's orbit around the sun regulate the amount of incoming solar radiation, affecting global climate patterns.
A global program called TIMES aims to synchronize age models for geological climate records, enabling the study of past warm climate stages and their impact on future climate pathways. The project is crucial for understanding the Earth's climate dynamics and obtaining reliable information about past climate events.
Researchers are on the trail of the 2011 mega earthquake's causes through deep-sea drilling. They aim to determine properties and processes in subduction zones, which can contribute to tsunamis.
A new study reveals that the Amazon rainforest is threatened by global warming and deforestation, which can trigger a domino effect on the entire system. The analysis of residual pollen and carbon residues suggests that the Atlantic Meridional Overturning Circulation (AMOC) plays a crucial role in shaping the Amazon ecosystem.
The study reveals that iron-bound organic carbon is remobilized during microbial-mediated iron reduction processes in the sulfate-methane transition zone, supporting microbial life. A stable proportion of total organic carbon survives degradation and is stored in marine sediments over geological time periods.
Researchers from MARUM and the National Oceanography Centre analyzed sensor data over four years to determine seafloor currents in deep waters. The study found that currents sped up, slowed down, reversed direction, and were steered by seafloor relief, contradicting previous steady models.
A new study reveals the Jøtul hydrothermal field in the Arctic Ocean, which is rich in minerals and metals. The discovery of high concentrations of methane indicates a significant interaction with magma, contributing to ocean acidification and climate change.
Researchers used stable oxygen isotope Delta-O-18 to analyze ITCZ changes over 30,000 years. The study identifies main components for ITCZ size, strength, and position influenced by Earth's axis inclination and orbit eccentricity.
Researchers found that microbial communities can stimulate decomposition of both fresh and old organic matter, with significant implications for the marine carbon cycle. The study suggests that increased input of fresh organic matter due to climate change could lead to a disproportionate effect on degradation of refractory organic matter.
A recent study found that microbial communities thrive on inactive hydrothermal vent smokers, producing organic carbon and fixing CO2. These ecosystems are crucial for understanding the deep-sea carbon cycle and its interactions with the environment.
Researchers reconstructed temperature and precipitation patterns for 200 BC to 600 AD, finding a link between climate change and three major pandemics. The study used high-resolution regional climate records and glass particle analyses to confirm the causal relationship.
New data analysis reveals that regional temperature patterns are crucial for evaluating climate models, with warmer temperatures in the North Atlantic and a cooler North Atlantic found to be more accurate. This approach provides better insights into the spatial impact of climate change and its effects on ecosystems and human societies.
Researchers used a well-tested climate model to depict changes in natural climate variability during the last peak glacial period. The study found that internal mechanisms, such as variations in salinity and temperature, drove the multi-centennial climate variability, resulting in fluctuations in sea ice extent and Greenland temperatures.
A long-term study compares data from two North Atlantic Current observation systems, revealing statistical connections and implications for regional temperature patterns. The findings suggest that a 25-year observational record provides a crucial foundation for future models of the Atlantic Meridional Overturning Circulation (AMOC).
New study uses flume-tank experiments to observe changes in sediment deposits and current velocities, revealing insights into past ocean currents. The findings have huge application potential for understanding climate, pollution transport, and benthic ecology.
Researchers have found large amounts of labile dissolved carbon stored in sediment interstitial water, indicating active organic carbon remineralization. The discovery suggests that earthquakes play a key role in the trench's carbon cycle and deep biosphere metabolisms.
Researchers have discovered a new record of protosteroids in Earth's Middle Ages, extending the current molecular record of eukaryotes to 1600 million years ago. This finding provides a rare glimpse into the conditions surrounding the evolution of complex life and may shed light on the competitive demise of ancient eukaryote groups.
Archaea of the genus Candidatus Alkanophaga use variants of methyl-coenzyme M reductase to degrade liquid petroleum alkanes at high temperatures. Bacteria of the genus Thermodesulfobacterium form consortia with archaea, facilitating degradation and contributing to the global carbon cycle.