Articles tagged with Paleoclimatology
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.
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 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.
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 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.
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 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 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 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.
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.
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.
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.
Researchers are using tree rings and sediments to reconstruct Atlantic hurricane history over millennia. By combining these natural archives with global climate model simulations, they aim to refine the record of history's hurricanes.
A new study found that birds and mammals evolved into new species at higher rates where the land has risen most over the past three million years. This effect was found to be greater than historical climate change, present-day elevation, and temperature in driving speciation.
Researchers from the Institute of Atmospheric Physics found that tropical Pacific decadal variability and Atlantic multidecadal variability drive Central Asian precipitation changes. Warmer SSTs in these regions favor wetter conditions, especially in southern and northern parts of Central Asia.
Research from UBC and HKU Earth scientists reveals that massive volcanism played a key role in triggering oceanic anoxia, with CO2-induced environmental warming creating 'dead zones' over short timescales. The findings provide important insights into the sensitivity of the Earth system to global biogeochemical cycles and marine biology.
Researchers reconstructed Mongolia's temperature history using a new tree ring analysis method, confirming record-breaking summer warmth over the past eight centuries. The study supports the delta blue intensity method and enhances climate projections, highlighting the urgent need to address Central Asia's rapid warming.
Researchers observed a 'warming bias' in the Earth's ancient history, with more warming events and greater temperature shifts than cooling events. The study suggests that a multiplier effect may kick back in as ice sheets disappear, leading to further amplification of human-induced global warming.
A new study reveals that the domestication of plants and construction of settlements based on agriculture in ancient Japan coincided with periods of relatively warm and stable climate. This challenges the conventional theory that a climatic cooling event drove humans to adopt agriculture.
A massive volcanic eruption in Indonesia about 74,000 years ago likely caused severe climate disruption globally, but early human populations were relatively unaffected. The study suggests that regional variation in climate impacts occurred, with the Northern Hemisphere experiencing cooling of at least 4°C.
The study suggests that the tropical rain belt's latitudinal oscillation range contracted, resulting in reduced rainfall in Brazil's Northeast region. This finding can help predict the region's future climate and inform strategies for managing food and water security.
Researchers used a new technique to reconstruct the climate of Europe during the Cretaceous period, finding that temperatures fluctuated between 15°C and 27°C. This shows that seasonal differences remained constant despite rising average temperatures, leading to hotter summers and warmer winters.
The study reveals that researchers' subjective decisions can lead to variations in climate reconstruction outcomes. The experiment showed notable differences in amplitude and sensitivity among multiple reconstructions using the same raw data. To improve reliability, teams are advised to create ensemble reconstructions.
A new study reveals that the End-Permian extinction event, also known as the 'Great Dying', was caused by a rapid spike in global temperatures due to volcanic activity. The researchers found that the region experienced abrupt aridification and changed climate patterns, with high-southern latitudes serving as refugia for moisture-loving...
Researchers present a new framework for studying 'the History of Climate and Society,' which reveals that past populations adapted by exploiting opportunities and resilient energy systems. Case studies show that societies like the Roman Eastern Mediterranean thrived under adverse climate conditions.
A global climate dynamic study suggests that shifts in the Southern Hemisphere westerly wind belt can trigger rapid, global changes in atmospheric temperature. This 'Zealia Switch' mechanism relates to ocean currents and heat engine releases, influencing glacier growth.
A research team from the University of Miami used a 600-year-old marine sponge to reconstruct Atlantic Ocean temperatures, showing past volcanic activity and current global warming trends. The study's findings provide valuable insights into the impact of human activities on climate change.
Fossil discovery provides insights into ancient Tibetan biota and land surface height in the middle Eocene. The study reveals a diverse and humid subtropical forest ecosystem at an elevation of 1,500 meters under a monsoonal climate.
Researchers recommend using past climates to evaluate and fine-tune climate models, as they often perform better with historic climates but struggle with ancient climates. This could help narrow uncertainties surrounding future temperature, ice sheet, and water cycle changes.
Researchers discovered a 190-year lag between Greenland's relative warmth and mild winters at the Black Sea, suggesting thermal adjustment of the ocean interior. Enhanced precipitation and warm lake temperatures followed.
Researchers from ETH Zurich and colleagues reconstructed the Paleocene and Eocene climates using siderite minerals, finding high humidity and heat transport. This suggests today's global warming is linked to increased moisture and heat transport in the atmosphere.
A 14,000-year paleoecological reconstruction found that seabird establishment led to changes in Falkland Islands ecosystems through guano deposition. This terrestrial-marine link is critical for grasslands conservation efforts, as nutrients from marine ecosystems enrich the islands' nutrient-poor soil.
Researchers reconstructed Oligocene sea surface temperatures and found a warm global climate despite low atmospheric CO2 levels. The findings challenge existing understanding of greenhouse climates in the past and shed light on Earth's surface temperature evolution.