Articles tagged with Paleoclimatology
Two GEOMAR researchers will receive €2 million EU funding over five years to study the Antarctic ice sheet, carbon cycles, and deep-sea biodiversity. Their projects aim to improve climate projections and solve deep-sea mysteries.
Researchers separate out microbial and environmental controls on marine sedimentary pyrite sulfur isotope ratios, revealing local processes that dominate the record. This breakthrough refutes previous hypotheses and offers a new framework for interpreting ancient signals.
Researchers found preserved yew trees from 4,200 years ago that reveal a sudden sea level rise likely killed the vast woodland. The trees contain valuable information about natural variability and potential links between global climate events.
A new tool called dahliagram enables cross-disciplinary collaboration to study past and present human-environmental interactions. The tool allows researchers to analyze and visualize diverse data sources, promoting nuanced understanding and testing hypotheses.
Researchers have reconstructed a global history of water over the past 2,000 years, showing that the global water cycle has changed during periods of higher and lower temperatures. The study found that when global temperature is higher, rain and other environmental waters become more isotopically heavy.
Researchers will study past 'greenhouse' periods in the Arctic to understand the impact of an ice-free region on the environment and society. The six-year project aims to quantify changes in sea ice and land ice dynamics, as well as ecosystems, to inform climate projections.
A team of researchers analyzed ancient leaf waxes to study past rainfall and drought patterns. By comparing their data with climate models, they verified how well those models capture past climate change and improved the accuracy of future rainfall predictions.
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.
Research suggests that coral reefs in Belize are experiencing a decline in growth rates, with accretion rates decreasing over the past 9,000 years. This decline has significant implications for tropical island nations and the impact of climate change.
A UNLV study found that a warm period in the early Holocene, when temperatures rose, led to increased summer rainfall and groundwater recharge. The researchers used an ancient stalagmite to analyze precipitation patterns and estimate the potential impact of future climate change on monsoon rains.
Researchers studied ancient aquatic plant waxes to understand how global warming affects methane production in Arctic lakes. They found that past warming led to an intensified methane cycle lasting thousands of years, and that ongoing warming could lead to previously under-appreciated fluxes in methane emissions.
A new laser-based sampling system allows for higher depth resolution, enabling scientists to reconstruct continuous annual temperature changes thousands of years ago. The LMS system overcomes previous limitations in sampling ice cores, preserving critical oxygen and hydrogen isotopes needed to infer past temperatures.
Researchers analyzed over 150 past crises, revealing that not every ecological shock or climatic anomaly leads to collapse or severe crisis. Societies' cultural, political, and economic dynamics interact with environmental forces to shape their responses.
Geologists found evidence of subduction at continental margins during periods of continental flooding, which raised sea levels. The study suggests that subduction under Gondwana may have caused the Sauk Transgression, a major flood event in North America's geologic record.
Researchers discovered that blending crushed rock with arable soil could help reduce global temperatures. The process, known as enhanced chemical weathering, works by releasing calcium and magnesium from rocks, which bind atmospheric carbon dioxide and prevent its release back into the atmosphere.
A new study reveals that volcanic eruptions can temporarily weaken the Pacific Walker Circulation, a major driver of global precipitation. The recent strengthening of this circulation suggests that aerosols from human activity may have an opposite effect on its behavior.
Scientists discovered that climate shifts during the last 400,000 years influenced the frequency of Neanderthal-Denisovan interbreeding. The researchers found that temperature changes triggered habitat overlaps, leading to increased contact between the two species.
A recent study reveals that past climate changes and vegetation shifts played a key role in determining when and where early human species interbred. The research suggests that the overlap of habitats led to increased encounters and interactions among groups, increasing the chance of interbreeding.
A new study reveals that extreme glacial cooling around 1.1 million years ago caused the extinction of early humans on the continent. The research suggests that the cooling pushed European climate to levels beyond what archaic humans could tolerate, emptying the continent.
Researchers linked chemical changes in seawater to volcanic activity and climate change, with a 7-fold decrease in lithium concentration over the past 150 million years. This shift is attributed to reduced seafloor hydrothermal activity, influenced by tectonic plate movements.
Researchers found that hydrothermal vents were active at shallow depths, releasing larger quantities of methane and carbon dioxide into the atmosphere. This discovery has significant implications for understanding past climate warming events.
A team of researchers at Texas A&M University has developed a new model to accurately measure ancient ocean temperatures using clumped isotopes. By understanding the reordering process, they were able to identify the role of water as an accelerator in resetting clumped isotope temperatures.
A new study enhances radiocarbon dating by creating a precise record of atmospheric shifts over 14,000 calendar years BP. This improvement allows for more accurate dating of sub-fossil samples, enabling researchers to reconstruct past environmental and climate changes during glacial times.
A new study reveals that large portions of Greenland were ice-free tundra landscapes with trees and woolly mammoths 416,000 years ago. The melting caused at least five feet of sea level rise during a moderate warming period.
Researchers have found sedimentary archives in sand dunes that can reconstruct reliable, multi-millennial fire histories. The discovery aims to expand scientific understanding of fire regimes around the world and uncover the role of humans on fire history.
A new study from Oregon State University found that massive iceberg discharges during the last ice age triggered rapid warming in Antarctica but had no effect on temperatures in Greenland. This discovery challenges current understanding of global climate dynamics and raises more questions than answers.
Researchers established quantitative relationships between coals and evapoerites with temperature and precipitation during the Phanerozoic. Coals formed predominantly in equatorial regions, while evaporites formed in subtropical dry zones.
Scientists uncovered fossils of palm leaves, hydrangea flowers and extinct plants from the same family as basswood, providing clues about climate conditions 40 million years ago. The discovery sheds light on the warmer temperate to subtropical climate that existed in the area during the late Eocene era.
Researchers used a coupled model to simulate ocean circulation and temperature during the MMCO, finding that global average temperature was over 3℃ higher than present. Extensive forest coverage played a significant role in climate regulation, with land temperatures particularly high in the Sahara and high northern latitudes.
The PaleoJump database offers a crucial tool for scientists to study abrupt transitions in the climate system. By analyzing pre-evaluated, relevant high-quality data archives, researchers can gain a clearer understanding of past climate change and its potential tipping points.
A newly published study of a stalagmite in Cave of the Mounds, Wisconsin, provides evidence for massive warming events during the last ice age, with temperature swings up to 10C over a decade. The research suggests a possible link between these events and Dansgaard-Oeschger events in Greenland ice cores.
A new study from Tulane University compared popular diets on nutritional quality and environmental impact, finding that keto and paleo diets scored among the lowest on nutrition quality and had the highest carbon emissions. Vegan diets, on the other hand, generated significantly less carbon dioxide per calorie consumed.
Researchers at the University of Bern and Empa have developed a new technique to measure greenhouse gases in ancient ice cores, enabling more accurate climate records. The method allows for high-resolution analysis of the oldest ice, which contains 15,000 to 20,000 years of climate history compressed into one meter.
Researchers found that the Paleocene-Eocene Thermal Maximum, a 5-8°C warming event, was caused by high carbon dioxide and methane levels. The team's study provides new insights into sedimentary systems and the impact of seasonal changes on ocean turbidity.
A review article in Nature suggests that the Earth was likely warmer 6,500 years ago and followed a cooling trend until human-caused warming began. The study's findings highlight uncertainties in climate models and underscore the need for further research on natural climate variability.
A dolphin-like species of kentriodontid, which lived in the western North Pacific, may have gone extinct 14 million years ago. Global cooling is thought to be a key factor in their extinction.
The new Radiocarbon 3.0 method provides valuable new insights into the earliest human history, starting with the interaction between Homo Sapiens and Neanderthals in Europe. This is achieved through updated radiocarbon pretreatment, latest AMS instrumental advances, and the application of the Bayesian model coupled with the new IntCal20.
Researchers found two distinct climate intervals where sea ice and ice-free summer conditions likely supported early human migration along the Pacific coastal route. These conditions, occurring from 22,000 to 24,500 years ago and again from 14,800 to 16,400 years ago, may have facilitated movement by providing a more traversable surfac...
A new study reveals that fishes in the deep ocean are likely to decrease in size with climate warming, which could have significant ecological effects. Researchers analyzed ancient fish otoliths to track changes in body size over glacial and interglacial periods.
Researchers created a map of ancient ocean 'dead zones' to predict future locations and impacts of low oxygen zones in a warmer Earth's oceans. The map showed that during the Pliocene epoch, low-oxygen waters were widespread in the Atlantic Ocean, particularly in the North Atlantic.
A new study links drought spells to the intensification of raiding activity by Hunnic peoples, who responded to climate stress by adopting new strategies and changing their social organization. The research suggests that extreme drought in the Carpathian Basin contributed to the fall of the Roman Empire.
A QUT study found that climate change believing southeast Queensland residents are more divided by socio-economic factors than political views. Climate change deniers predominantly have right-wing perspectives and are older and less educated.
Researchers have developed a robot capable of sorting, manipulating, and identifying microscopic marine fossils. Forabot uses robotics and artificial intelligence to automate the tedious process of evaluating foram shells and fossils.
Scientists analyze past El Niño events to better understand climate patterns over the past 12,000 years. They found that Eastern Pacific events have increased in frequency, while Central Pacific and Coastal events have decreased, resulting in changes in hydroclimate in the tropical Pacific.
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.