Articles tagged with Paleoclimatology
New research reveals that vegetation feedbacks played a key role in speeding up major climate changes during the late Miocene. Shifts in plant life intensified cooling in northern high latitudes and altered rainfall patterns in lower latitudes.
A new study compares tropical mountain ice cores to climate model simulations, revealing discrepancies in Earth's average temperature trends. Researchers found that ice core data and computer models match for polar regions like Greenland and Antarctica, but not for tropical mountains.
A plume of hot rocks from the Earth's mantle created a conveyor belt for heat to rise, leading to the gradual uplift of the Arabian Peninsula and the creation of a land bridge between Asia and Africa. This event enabled the early ancestors of elephants, giraffes, and humans to roam between the two continents.
A tree-ring study published in Climatic Change suggests that severe summer droughts in 364, 365 and 366 CE led to the 'Barbarian Conspiracy' of 367 CE. The researchers argue that these droughts triggered food shortages and reduced grain supply to Hadrian's Wall, providing a motive for the rebellion.
A new study reveals that the Saharo-Arabian Desert experienced recurrent humid intervals over the past eight million years, supporting migrations of water-dependent animals, including early ancestors. These wetter periods likely sustained monsoonal precipitation from the South, which gradually weakened over millions of years.
Researchers at Washington University in St. Louis analyzed rainfall data and found that the July 2022 floods were not as exceptional as initially thought. The study suggests storms like this will become more frequent due to global warming, which is increasing the frequency of extreme precipitation events.
A 30-meter sediment core from the Great Blue Hole in Belize provides the longest recorded storm frequency data for the Atlantic, with 574 storm events over 5,700 years. The research reveals a steady increase in tropical storms and hurricanes in the southwestern Caribbean due to climate change.
Scientists studied plant fossils and climate models to understand the Permian-Triassic mass extinction. The study found a 10°C rise in global temperatures and dramatic changes in ecosystems.
Researchers have presented a unique time-dependent record of drainage divide migration rates, showing that episodes of rapid shift coincide with past climate changes in the Negev over the last 230,000 years. This discovery accelerates our understanding of how climate affects the Earth's surface.
A team of researchers has matched Earth's ice age cycles with orbital shifts, predicting the onset of the next ice age in approximately 10,000 years. The study analyzes a one-million-year record of climate change and finds a predictable pattern for glacial and interglacial periods.
The Solar System passed through the Radcliffe Wave galactic structure approximately 14 million years ago, compressing its heliosphere and increasing interstellar dust influx. This journey may have impacted Earth's climate and left geological traces.
Researchers from Utrecht University studied icebergs' routes during rapid ice cap deterioration and found evidence of ancient material from Antarctica near South Orkney Island. The study suggests that Antarctica had an ice cap in the late Eocene, and large icebergs could survive in warm ocean conditions.
A new study reveals Arabia's rainfall was significantly more extreme in the past, with the region once resembling a vegetated savannah. The findings underscore the critical need for enhanced climate resilience and disaster preparedness to address the growing threat of extreme weather events.
A new study by Connecticut College reveals that palm trees once thrived in subarctic Canada during the late early Eocene, approximately 48 million years ago. This finding indicates a warmer climate with ice-free winters, unlike previous assumptions.
Researchers examined 16th-century written sources to understand climate change in Transylvania. The study found that hot weather was recorded more frequently than cold weather, with extreme events like floods and famines occurring due to climate variations.
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 at Harvard University used photochemical modeling to simulate how ancient Mars' climate was affected by atmospheric chemistry and crustal hydration. They found that episodic warm spells were driven by crustal hydration, leading to the buildup of hydrogen in the atmosphere.
Scientists studied ancient whitebark pine forest on Beartooth Plateau, finding the tree line was 600 feet higher during a moderate climate period. The discovery sheds light on how dynamic ecosystems respond to temperature warming and offers insights into future changes for alpine environments.
A new study suggests that increased wildfire activity was a feature of past periods of abrupt climate change, which also saw significant shifts in tropical rainfall patterns and temperature fluctuations. The research analyzed ancient methane trapped in Antarctic ice and found that the spikes were likely caused by global wildfires.
A research team led by Dr Sophie Warken analyzed dripstones from the Cloşani Cave in Romania to understand precipitation variability over a period of approximately 20,000 years. The findings show that dynamic processes like the North Atlantic jet stream influence regional changes in precipitation.
The Virginia Tech analysis extends the chart of life by nearly 1.5 billion years, mapping the rise and fall of ancient life from the Proterozoic Eon. The study reveals that global ice ages accelerated the pace of evolution in species counts.
Climate scientists from Utrecht University and the University of Manchester conclude that massive volcanic eruptions had little to no effect on dinosaur mass extinction. The team reconstructed air temperatures for the time period covering both volcanic eruptions and the meteorite impact, showing that temperatures had already stabilized...
A recent Colorado State University study demonstrates that climate change can affect earthquake frequency, as glaciers recede and slip along faults increases. This suggests that earthquake activity could increase as glaciers melt, impacting hazard assessment and seismology.
Scientists reveal that the Antarctic ice sheet is more unstable than previously thought, with periods of sudden melting linked to changes in Earth's orbit. The study provides a glimpse into the potential behavior of Antarctica without the Greenland Ice Sheet, highlighting the urgent need for climate action.
A new study by UCL researchers found no lasting changes in the Earth's climate after two massive asteroid impacts around 35.65 million years ago. The impact craters left behind no evidence of a shift in climate over 150,000 years.
The Antarctic Canyon Experiment (ACE) aims to assess the causes and effects of turbidity currents, also known as underwater avalanches, in the Southern Ocean. Researchers hope to develop a better understanding of Antarctica's role in regulating Earth's climate and mitigating carbon emissions.
New research reveals that during the early Eocene, the rain belt's seasonal shifts weakened dramatically due to extreme warming and a reduced Intertropical Convergence Zone (ITCZ). This ancient change could offer critical warnings about the impact of modern global warming.
The Eastern Tropical Pacific's Oxygen Deficient Zone (ODZ) expands and contracts every ten years, driven by Pacific decadal climate variability. This dynamic process has important consequences for marine ecosystems, as ODZs could respond quickly to climate changes.
A recent study provides fresh insights into the ocean's role in climate during the Mid-Pleistocene Transition, a period of change that began about one million years ago. The research suggests that changes in the deep ocean played an equally important but nuanced role in driving climate cycles.
A 15-year study of an ancient ecosystem in Bolivia provides a comprehensive view of the Earth's past, revealing warmer temperatures and lower elevation. The team found fossils of diverse animals and plants, reconstructing the site as a dry forest or wooded savanna with palms and bamboos.
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.
A recent study suggests that enhanced Arctic sea-ice melting during the Last Interglacial period led to significant cooling in northern Europe. The researchers used sediment cores and geochemical tracers to reconstruct past ocean conditions, highlighting the importance of feedback mechanisms in the climate system.
Research from multiple ice cores in Greenland provides new understanding of Dansgaard-Oeschger events, which represent 'tipping points' in Earth's climate. The findings suggest interactions between the Atlantic Meridional Overturning Circulation and wintertime sea ice play a key role in these events.
A new study uses deep learning to infer the frequency of atmospheric blocking events over the past 1,000 years, shedding light on their potential impact under climate change. The model was trained using historical data and large ensembles of climate model simulations.
A Dartmouth-led study found that air pollution from fossil fuels reaches the remote Arctic, altering its fundamental atmospheric chemistry. The researchers detected declines in methanesulfonic acid, a biomarker linked to phytoplankton productivity, which plummeted in environments high in emissions.
Tree-ring data reveal that periodic shifts in strong winds high above the Earth's surface have driven opposite climates in different parts of Europe for the past 700 years. This research provides critical data to improve climate models, comparing past patterns to current trends and societal impacts.
The study presents a curve of global mean surface temperature that reveals significant fluctuations in Earth's temperature over the past 485 million years. The research confirms that carbon dioxide is strongly correlated with global temperatures across geological time.
A new reconstruction of Earth's temperature history over the past 485 million years reveals a wider range of climate variability than previously understood. The study suggests that atmospheric carbon dioxide has been the primary driver of climate changes during this period, with temperatures varying more dynamically than thought.
A new study reveals that Earth's surface temperature has varied more greatly over the past 485 million years than previously thought. The study, co-led by the Smithsonian and University of Arizona, confirms that carbon dioxide is strongly correlated with global temperatures across geological time.
A coral colony from Fiji has provided a new record of sea surface temperatures in the southwestern Pacific, revealing that 2022 was the warmest year in over 600 years. The reconstruction uses data from the giant coral Diploastrea heliopora, which records long-term climatic and environmental changes.
The 'Our Way Model' reveals four phases of human dispersal, including a slow expansion from the Levant to western Europe and rapid advancements into previously unsettled areas. Climate change significantly impacted human dispersal, with periods of severe cold and warming influencing population growth and decline.
A team of researchers discovered that a 'tag-team' between the oceans and continents led to severe environmental crises, causing mass extinctions of marine species. The study found that chemical weathering pulses disrupted the oceans, leading to anoxic events that had profound impacts on marine ecosystems.
Researchers analyzed fossilized shells to reconstruct sea surface temperatures and atmospheric CO2 levels during two hyperthermals, finding a close link between the two. The study provides insights into carbon cycle feedback mechanisms and sensitivities critical for predicting anthropogenic climate change.
A team of geoscientists has identified the origin of the massive asteroid that wiped out 70% of Earth's species 66 million years ago. The study found the asteroid was a carbonaceous-type asteroid that formed outside Jupiter's orbit.
A research team from the University of Göttingen has developed a new method to analyze the oxygen isotope composition of coral skeletons, allowing for more accurate temperature reconstructions and insights into biomineralization processes. This breakthrough enables scientists to correct for 'vital effects' that can distort climate data.
A new study confirms that the center of Greenland's ice sheet melted away in recent geological past, exposing a green, tundra landscape. The discovery suggests that the giant ice sheet is more fragile than previously thought and increases the risk of sea-level rise, potentially leading to catastrophic flooding in coastal cities.
Scientists have reconstructed climate information from rocks dating back to the Devonian period, finding significant geological events such as oceanic openings and mountain uplift. The study's findings may help improve the usability of deep geothermal energy.
A new junior professorship in Earth System Science at Mainz University, sponsored by the Volkswagen Foundation, will establish a specialized lab for paleoclimate research. The lab will analyze high-resolution sediments formed thousands to millions of years ago to reconstruct past climates, including seasonal patterns.
A new study led by UCL researchers found that the Gulf Stream was stronger during the last ice age due to more powerful winds across the subtropical North Atlantic. If climate change causes a reduction in these winds, the Gulf Stream could weaken, potentially cooling Europe and causing higher sea levels in North America.
Patients in sunny climates may require higher doses of Botox to achieve good results in cosmetic treatment. The study found a significant difference in total Botox dose needed between high-sun and low-sun groups, with patients in Malta needing more Botox due to greater muscle activation and potential effects of sunlight.
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.
A 45-year-old drill core extracted from the Pacific Ocean has revealed a strong relationship between past atmospheric CO2 levels and temperature. The study found that CO2 concentrations dropped by 650 parts per million over the past 15 million years, suggesting a potential impact on global temperatures.
Lokiceratops rangiformis, a plant-eating dinosaur with large horned frill and asymmetrical caribou-like antlers, has been discovered in Montana. The species' unusual features may have played a role in mate selection or species recognition.
A UC Riverside study shows that extreme heat in Earth's past caused a decline in the exchange of waters from the surface to the deep ocean, which redistributes heat around the globe. This system has been crucial for regulating Earth's climate and removing anthropogenic carbon dioxide from the atmosphere.
A study by Yuxin Zhou of UC Santa Barbara's Department of Earth Science found that Greenland's ice sheet retreat is not sufficient to completely derail the Atlantic circulation. The AMOC will be determined by a tug-of-war between decreasing ice flux and increasing freshwater runoff, which can disrupt the ocean current.
A study published in Nature Communications reveals that the Cerrado biome in Brazil is experiencing its worst drought in at least 700 years, caused by global warming. The research used chemical analysis of stalagmites to extend the perception of drought back seven centuries and linked it to disruption in the hydrological cycle.
Researchers measured fossil shells' chemical composition to reconstruct Pliocene climate temperatures, finding summers warmed by 4.3 degrees compared to winters
Researchers from the University of Cambridge and Johannes Gutenberg University Mainz found that 2023 was the hottest summer in the Northern Hemisphere in over two millennia, with temperatures 2.07C warmer than the coldest summer on record. The study uses tree ring data to show that global warming is having a profound impact, especially...
Researchers found that weaker ocean currents during the Younger Dryas period led to a decline in nutrient availability, resulting in decreased biological productivity in the North Atlantic. This study supports predictions about the impact of climate change on ocean circulation and life.
Researchers have found that plants help regulate the planet's atmosphere by trapping carbon and emitting oxygen, acting as a buffer against rapid climate changes. However, when climate shifts too fast for vegetation to adapt, it can lead to mass extinctions and extreme environmental changes.