Articles tagged with Paleoclimatology
A team of 15 researchers will drill through ice cores 2.7 km deep, revealing temperature and greenhouse gas data from the past. The project aims to solve the mystery of climate periodicity during the Mid-Pleistocene Transition.
A new study by researchers from the University of Oldenburg found that particles from central South America were the primary source of iron in the South Pacific during the last two glacial periods. The team's theory suggests that jet stream circulation picked up fine mineral particles on the east side of the Andes and transported them ...
A study reveals a consistent pairing of volcanic ash and low ocean oxygen events during times of rapid climate warming at the end of the last ice age. The research suggests that volcanic eruptions may increase as the planet warms, posing risks to populated regions.
Researchers uncovered favorable environments for hominins in Central Asia's steppe and semi-arid zones during the Pleistocene era. The study suggests that these regions were crucial for early human dispersals out of Africa and through Asia.
Researchers created global temperature maps of Earth during the Paleocene-Eocene Thermal Maximum, a time period similar to our own future under climate change. The study found that the climate was more sensitive to carbon dioxide increases than previously thought, with sensitivity between 5.7 to 7.4 degrees Celsius per doubling.
A recent study found that insect herbivores have caused more damage to plant matter from leaves in recent history than millions of years ago. The frequency of leaf damage by insects among forest plants in recent history is more than twice that of vegetation from the Pleistocene and Late Cretaceous periods.
Researchers used largest temperature reconstruction database to find no globally synchronous warm period during the Holocene. Regional variability in temperature suggests high latitude insolation played a major role in driving climate changes.
Climate variability in eastern Africa influenced hominin evolution, leading to anatomically distinct groups and modern human separation. Researchers analyzed lake sediment cores, revealing stable humid conditions, abrupt arid pulses, and extreme environmental shifts.
Researchers have created the first charts of Antarctic ocean temperatures over the past 45 million years using molecular fossils and machine learning. The study suggests that the planet is nearing a 'tipping point' where ocean warming caused by CO2 will lead to catastrophic sea level rises.
Researchers analyzed eight ice caves in Tyrol, Styria, Upper Austria, and Carinthia, finding a decline in ice mass over the past 2000 years due to human-induced climate change. The study mirrors the evolution of glaciers during the Late Holocene period, with significant consequences for these underground ice formations.
Researchers analyzed annual growth rings from Yamal's subfossil trees to track summer temperature over the past 7,638 years. The findings indicate that current warming is unprecedented during the past seven millennia.
A recent study found that ocean cooling over the past 100 million years led to increased body size in tetraodontiform fishes, adhering to Cope's and Bergmann's rules. The researchers combined genomic and fossil data to support this finding, which was previously less well understood for ectothermic species.
Harvard researchers found that rapid evolution of reptiles began much earlier than previously thought, connected to increasing temperatures. The study used a dataset of over 1,000 fossil specimens and analyzed their adaptation to climatic shifts.
A new study found that North American mammal communities have become more than twice as homogenous as they were 10,000 years ago, primarily due to early human hunting and farming activities. The accelerated homogenization is likely linked to the spate of large-mammal extinctions, which increased similarity among remaining species.
Researchers analyzed fossil corals to reveal changed ocean current circulation patterns. The data supports a scenario where the upper Pacific Ocean was more mixed during the last ice age, contributing to carbon storage and cooler climates.
Researchers found that extreme droughts in the 6th century CE led to the downfall of the ancient South Arabian kingdom of Himyar. This climate instability created fertile ground for the emergence of Islam in the region, as people sought new hope and a unifying force.
Research by University of Texas Institute for Geophysics reveals how ancient global warming affected the Gulf of Mexico's marine life and chemistry. The study found that radiolarians thrived in the Gulf due to nutrient-rich river sediments, providing valuable lessons about current climate change.
Researchers have discovered a 30-mile-long, 9-mile-wide subglacial lake in East Antarctica that may hold the key to understanding the continent's glaciation history. The sediments at the bottom of Lake Snow Eagle could provide valuable insights into climate change and the ice sheet's possible demise.
A recent study reveals that massive carbon emission during the Late Paleozoic Ice Age led to anoxic areal extent equivalent to 20% of the seafloor and significant biodiversity loss. The research team used geochemical signals, sedimentology, and climate modeling to simulate the effects of a 300,000-year warming event.
A new study describes a period of rapid global warming in an ice-capped world 304 million years ago, resulting in atmospheric carbon dioxide levels doubling and oceans becoming anoxic. Biodiversity dropped on land and at sea, with about 23% of the seafloor worldwide becoming anoxic dead zones.
A remote Irish community endured a millennium of climate change and ecological shifts without significant disruption, thanks to its adaptable social practices. The study, published in PLOS ONE, analyzed peat core data to infer environmental and human occupation changes over 1,000 years.
Neanderthals occupied a lightly wooded lakeshore about 90,000 years ago in a relatively temperate climate. Stone tools found at the former campsite attest to activities such as woodworking and plant processing.
A new Swansea-led project will analyze the chemistry of ancient oak trees to reconstruct the climate of north-west Europe and improve dating accuracy for wooden structures. The QUERCUS project aims to develop the first annually-resolved tree-ring isotopic chronologies for the UK and north-western Europe, extending back 4,500 years.
A new study by an international team of scientists links early human habitats to past climate shifts using a supercomputer model and fossil records. The research suggests that climate change played a central role in determining where different hominin groups lived and their remains were found.
A recent study combining climate data with fossil records of large mammals in Africa found that times of erratic climate change do not lead to major evolutionary changes. The research, published in the Proceedings of the National Academy of Sciences, suggests that environmental variability and species turnover may not be closely related.
Researchers revised their understanding of the relationship between Atlantic Meridional Overturning Circulation (AMOC) and freshwater from melting polar ice. A new model simulation suggests that AMOC is less sensitive to freshwater forcing than previously thought, contradicting long-held assumptions.
Scientists have found argon trapped in ice cores from Greenland and Antarctica, which can be used to reconstruct past climate changes and temperature shifts. The discovery could improve our understanding of the Earth's atmosphere and climate over hundreds of thousands of years.
A new study, led by UMass Amherst, found that drought, not colder temperatures, contributed to the demise of the Norse settlement in southern Greenland. The researchers analyzed sediment samples from a lake near a former farm and found a prolonged drying trend coincident with the settlement's collapse.
A new study reveals a precursor event to the Paleocene-Eocene Thermal Maximum (PETM), a period of extreme global warming. The short-lived event's carbon emissions, similar to current human activities, suggest a possible scenario for quick emission shutdowns.
Scientists confirm a brief rise in CO2 emissions before the Paleocene-Eocene Thermal Maximum (PETM), an abrupt global warming event. The study reveals unique insights into how Earth's current climate could respond to continued carbon emissions.
A study analyzing 9,000 years of Earth's history found that strong El Niño events intensified over time but with a small change due to global warming. Researchers used ancient coral data and powerful supercomputers to conduct their research, calling for further investigations into earlier climate periods.
Researchers studied the Pliocene period, discovering that ice sheet retreat and forest expansion led to wetter conditions in previously dry areas. Current models perform well at simulating these changes, indicating a need for long-term planning to address projected future climate shifts.
Researchers used lake sediment in the Tibetan Plateau to estimate that high-elevation alpine permafrost will melt faster than arctic permafrost, releasing greenhouse gases and contributing to global temperature rise. The study suggests that up to 60% of alpine permafrost land area may be lost under current warming conditions.
Researchers studied ancient Antarctic ice cores to understand past atmospheric carbon dioxide concentrations. They found a strong correlation between carbon fertilization and increased biological production, which dampens global warming acceleration during glacial periods.
Researchers found exceptionally preserved fossils from different locations, suggesting that rising global temperatures during the Early Jurassic period may have created favorable conditions for fossilization. The study suggests that past climate change could have enabled exceptional preservation in various environments.
A new study suggests that mummification in prehistory was more common in Europe than thought, dating back to 8,000 years ago. The researchers found evidence of desiccation and hyperflexion in skeletal remains from the Sado Valley in Portugal.
Researchers in Acadia National Park found that regulations reducing atmospheric sulfur have led to a partial recovery of algae ecosystems, despite ongoing climate change impacts. Clear-water lakes like Jordan Pond are more sensitive to warming than brown-water lakes like Seal Cove Pond, leading to slower recovery rates.
The end-Permian mass extinction was characterized by a 10-degree climate warming, with 75% of organisms going extinct on land and 90% in oceans. Machine learning analysis reveals that declining oxygen levels, rising water temperatures, and ocean acidification were the key factors in organism survival or extinction.
Researchers found that Indian Summer Monsoon rainfall was less intense during the Last Interglacial period than in the current warm period, contradicting paleoclimate model simulations. The study suggests that sea surface temperature plays a dominant role in shaping monsoon variability in South Asia.
Researchers discover Amazon basin as main mechanism for precipitation in Atacama Desert, accounting for 40-80% of total precipitation. The findings reveal a new pathway of water supply for the driest region on Earth, aside from summer rain, through moist easterly winds and winter storms.
A recent study by Dr. Henrik Svensmark and colleagues reveals a close connection between supernovae occurrence and the burial of organic matter in sediments on Earth. The correlation indicates that supernovae are essential for life's existence, with high nutrient concentrations leading to increased bioproductivity and oxygen production.
A recent study analyzing air bubbles preserved in Antarctic ice for up to 1.5 million years suggests that glacial erosion is likely responsible for the decline of atmospheric oxygen levels over the past 800,000 years.
Scientists studied the Lanzhou Basin sedimentary succession to reconstruct Asian monsoon precipitation patterns during a warm, high-CO2 world. They found prominent short and long eccentricity cycles influencing monsoon variability, which may become increasingly susceptible to global warming.
A new study reveals that the Little Ice Age was triggered by an unusually warm episode in the late 1300s, with strong northward transfer of warm water and high solar activity contributing to the phenomenon. The researchers found that this warming event led to rapid arctic ice loss and subsequent cooling of North Atlantic waters.
Scientists have discovered a way to extract monthly and weekly ocean temperature records from the shells of tiny surf clams, revealing clues to Earth's past climate. The study uses a species of short-lived clam that has not been used before, allowing researchers to reconstruct sea surface temperatures and past climates with precision.
A new MIT study uses climate modeling to reconstruct global hurricane activity, finding a significant increase in North Atlantic hurricanes over the last 150 years. In contrast, global hurricane frequency remains unchanged. The study's findings suggest regional climate variations play a key role in shaping hurricane patterns.
A recent study revealed Asian climate variability across the early-to-middle Pliocene Warm Period, providing insights into future climate change. The research found that CO2-induced global warming led to increased summer monsoon moisture transport over East Asia and aridification in Central Asia.
Researchers reconstruct Land of Israel climate at end of last ice age using plant remains, revealing significant temperature and precipitation differences that impacted the transition from hunter-gatherer to settled agricultural societies. The study provides insights into the region's flora and its response to past climate change.
Climate scientists have identified abrupt transitions in ice core records using a new statistical method. The method analyzes the ratio of two oxygen isotopes to determine whether changes are due to noise or significant climactic shifts.
Researchers developed an automated method to detect and date abrupt climate events in paleoclimatic data, facilitating the study of climate tipping points in the past. The new tool can help establish chronology of close events and eliminate uncertainties during comparisons of different paleo records.
A University of Arizona-led study reconstructs Earth's climate since the last ice age, highlighting unprecedented global temperatures and the speed of human-caused warming. The research combines two independent datasets to create a more complete picture of past temperatures.
Recent advances in radiocarbon knowledge have improved our understanding of climate processes, solar activity, geophysics, and the carbon cycle. Researchers developed a more detailed record of atmospheric radiocarbon extending back 55,000 years, helping to understand Earth's past and project future changes.
Researchers found that during hothouse periods, Earth may have experienced cycles of dryness followed by massive rain storms. This unexpected atmospheric state sheds light on Earth's distant past and far-flung future, potentially helping to understand climates of exoplanets.
Researchers used ancient climate reconstructions to improve understanding of climate system thresholds and predict abrupt changes. By applying paleoclimate information to Earth System models, they demonstrated improved accuracy in simulating past abrupt climate events.
Research finds climate stabilized due to increased rock weathering and erosion, which converts CO2 into insoluble carbonate; this process took 20,000-50,000 years. Lithium isotope analysis supports theory, showing increased weathering and erosion during Paleocene-Eocene Thermal Maximum.
Researchers analyzed an ice core from Greenland and found that fires in the North Atlantic region decreased over 4,500 years ago due to weaker summer insolation and expanding glaciers. Human interference, such as Viking colonization, also played a role in reducing fire frequency.
A new study reconstructed the Kuroshio Current Extension's past behavior, finding it was sensitive to global climate change during the Pliocene era. The current's sensitivity to CO2 levels is a concern for its potential impact on ecosystems, weather patterns, and regional climates.
Ancient human societies adapted to tropical ecosystem dynamics, revealing their adaptability and resourcefulness. By studying these past interactions with the environment, scientists can better understand how to conserve tropical environments.
Researchers at Max Planck Institute found that early human groups in Europe endured cold climatic conditions for over 7,000 years. The team used archaeological materials to generate climatic data, revealing a higher degree of climate flexibility than previously believed.
A study published in the journal Geology confirms that a giant meteorite impact caused the mass extinction of species in the late Cretaceous. The researchers analyzed sediments and rocks from the Zumaia cliffs, revealing three intense climatic warming events unrelated to Deccan volcanic activity.