Articles tagged with Paleoclimatology
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.
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...
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.
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.
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.
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 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 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 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.
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.
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.
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.
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 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.
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.
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 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.
A new study found that massive flood basalt volcanism drove mass-extinction and disturbance, while extreme climate change and Hg-pollution continued to stress plants long after volcanic activity had ceased. The results show that ferns were robust enough to continue thriving despite mercury poisoning.
Researchers analyzed the last ice age to better understand the relationship between CO2 and global temperature. The study finds that the absolute worst-case scenario is unlikely, reducing the estimated warming from doubling CO2 by a full degree.
The Antarctic Circumpolar Current's flow speed has fluctuated significantly over the past 5.3 million years, with slower speeds during glacial periods and faster speeds during interglacials. This study provides valuable insights into the current's response to climate fluctuations and its impact on Antarctica's ice sheets.
A groundbreaking scientific drilling project has unearthed the world's longest geological record of the Cretaceous period, spanning over 50 million years. The project, led by Professor Wang Chengshan, has provided crucial insights into paleoclimate research and will continue to aid in predicting future climate trends.
Researchers have developed a novel method for reconstructing historical warm season temperatures in North China using Picea meyeri tree rings. The study provides a 281-year chronology, revealing seven high-temperature periods and three low-temperature periods over the past 261 years.
Researchers found a rich find of evidence, including 75 fossil tracks and tree stumps, indicating a riverine or delta setting for dinosaurs. The discovery suggests the region received approximately 70 inches of precipitation annually during the mid-Cretaceous Period.
Researchers found that the West Antarctic Ice Sheet thinned by 450 meters in just under 200 years at the end of the Last Ice Age. The study sheds light on how quickly Antarctic ice could melt if temperatures continue to soar.
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.
Researchers discovered human fossils and artifacts at Ilsenhöhle in Ranis, Germany, indicating that Homo sapiens arrived in cold northern latitudes before Neanderthals disappeared in southwest Europe. The analysis of ancient DNA and zooarchaeological findings suggests that humans consumed a diverse range of animals during their stay.
Researchers found that trees in warmer, drier climates release more CO2 than they absorb, potentially compromising their ability to mitigate climate change. The study used a global dataset of tree tissue to analyze photorespiration rates, which are up to two times higher in warmer climates.
A newly published study provides a high-resolution climatic record for ancient Italy, revealing phases of climatic instability that overlap with periods of social and political crisis. The marine core record also shows a strong association between episodes of rapid climate change and epidemics of infectious disease.
Scientists have found that deposits deep under the ocean floor reveal a way to measure ocean oxygen levels and their connections with carbon dioxide during the last ice age. This study could improve predictions of how oceans will respond to global warming.
Researchers found that the Asian summer monsoon's strengthening played a key role in Homo sapiens' dispersal from Africa to East Asia during the last interglacial period. The study integrated paleoanthropological data with high-resolution reconstructions of the monsoon, suggesting a link between climate change and human migration.
A new study reveals that the last time atmospheric carbon dioxide reached today's human-driven levels was 14 million years ago, indicating a highly sensitive climate to greenhouse gases. The research also predicts a whopping 5-8 degrees C warming with a doubling of CO2, highlighting the urgent need for present-day climate policy.
Researchers from SapienCE Centre of Excellence use dripstones to study past climate in South Africa. They found that the region experienced highly variable rainfall and slightly warmer temperatures during a crucial time period for early human occupations.
A new study of 600 years of tree rings from the San Joaquin Valley reveals that climate extremes have been more severe and lasted longer than modern records, highlighting flood and drought risks in California. The research combines paleo information with synthetic weather generation to help understand and anticipate these risks.
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.
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.
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.