Articles tagged with Paleoclimatology
A new study finds that carbon emissions will have long-lasting impacts on the planet, with some effects lasting over 100,000 years. The researchers warn that reducing emissions slightly or significantly is not sufficient to prevent catastrophic consequences.
The analysis highlights the importance of considering long-term impacts of climate change, which can last tens of thousands of years. Reducing emissions slightly or significantly is not sufficient, with the target being zero or negative carbon emissions as soon as possible.
Recent studies show a connection between the Earth's tilt and the movement of the Intertropical Convergence Zone, the world's heaviest rainbelt. This new information enables climate scientists to better predict extreme weather events and has implications for global climate and sustainable human socioeconomic development.
Junior Professor Denis Scholz will continue speleothem research, extending it to longer-term objectives. Speleothems are suitable archives of past climate variability due to their global distribution and precise dating capabilities.
A new study found that California's 6th-grade science textbooks give climate change a mixed message, presenting it as a controversial debate and downplaying the role of humans. The textbooks do not accurately reflect the scientific consensus on human-caused global warming.
Researchers at University of Zurich predict up to 30% less precipitation in the Central Andes by 2100, exacerbating seasonal water shortages. The study suggests stronger westerly winds will lead to greater aridity, impacting the region's climate.
Researchers are refining their understanding of ice sheet response to warming, which will inform projections of sea-level change. A new era of climate modeling has begun, with improved estimates of Greenland and Antarctic ice sheet loss for given temperature increases during past warm periods.
Researchers found that lower oxygen levels led to increased precipitation and warmer temperatures due to the resulting drop in atmospheric density. The study's findings suggest that changes in oxygen concentrations may help explain features of past climates not accounted for by variations in carbon dioxide levels.
A recent paper by University of South Carolina paleoceanographer Kelly Gibson shows that rapid climate change affected marine ecosystems in the Cariaco Basin, a body of water off Venezuela's coast. The study used nitrogen isotope ratios to estimate changes in primary productivity and carbon sequestration in the ocean.
Researchers found evidence of regional drought between 500 and 1150 AD in Mexico, contributing to the abandonment of Cantona, a large fortified city with a population of 90,000 inhabitants. The study suggests that climate change played a role in the site's history, highlighting the interplay of environmental and political factors.
The four-part iBooks Textbook series explores climate change, its impacts on ecosystems, and strategies for adaptation. The books align with Next Generation Science Standards and Climate Literacy, offering a real-life experience for students to engage in discussion.
A new study has found that the climate of a large swath of the western United States during the Jurassic period was more complex than previously thought. Geochemical analysis of ancient soils revealed an abrupt change from dry to wet environments, contradicting the long-held assumption of a gradual transition.
A new paper by James Hansen and colleagues assesses the impacts of global warming, concluding that drastic emission reductions are needed to stabilize the climate. A call for papers on responses to climate change has been issued, with a focus on alternative energy development, environmental preservation, and ecosystem restoration.
ASU researchers are part of a $28 million NSF-FESD grant program to study the Great Oxidation Event and ancient climate change. They aim to understand the role of Earth system dynamics in human evolution, using a combination of models, geochemical proxies, and laboratory experiments.
Researchers found that year-round ice-free conditions in the Arctic could explain amplified warming during the Pliocene Epoch, with warmer temperatures and reduced seasonal cycles. The study used climate models to simulate the effects of ice-free winters and summers, revealing a possible mechanism for Pliocene warming.
Researchers John Isbell and Erik Gulbranson study ancient climate shifts to understand modern-day drastic climate change. They find evidence of 22 individual ice sheets in Gondwana, suggesting dramatic temperature swings and atmospheric CO2 levels fluctuations.
A new study confirms that 150 million-year-old Jurassic ecosystems were characterized by lush plant life and animal richness, similar to modern ecosystems. By analyzing fossil soils from various regions, researchers found high levels of CO2 from vegetation, indicating a wetter environment with abundant plant growth.
Research suggests that cooler climates led to increased biodiversity in marine fauna, while warmer temperatures caused species to become extinct. The study's findings indicate that climate fluctuations played a significant role in the emergence and extinction of species.
Researchers studied Dead Sea sediment cores to reconstruct climate conditions over the past 10,000 years, finding rapid changes between moist and dry phases. They linked pollen data to plant species that can tolerate specific temperature and precipitation levels.
Researchers from Germany, Finland, and beyond create a high-resolution temperature reconstruction of the Roman and Medieval Warm periods, revealing a previously unseen long-term cooling trend. The study, published in Nature Climate Change, suggests that this cooling trend may have been underestimated by previous climate reconstructions.
A new study reconstructed Australasian temperatures over the last millennium using natural climate records, revealing no warmer periods since 1950. The results support human-caused climate change as the primary driver of recent warming in the region.
A study published in Weather journal has reconstructed past climate events in Iraq and Syria using ancient Arabic records. The research team found a high number of cold waves, droughts, and floods between 816-1009, with temperatures dropping as low as 18°C in July 920.
Researchers have analyzed ancient manuscripts from 9th-10th century Iraq to reconstruct the climate of the past. The study reveals abnormal weather patterns, including droughts and floods, as well as rare cold events such as hailstorms and snowfall in Baghdad.
Jack Williams' research uses paleoecological data to understand species responses to past climate change, revealing the importance of combining modern and historical data for accurate predictions. This approach aims to improve forecasting ability and inform conservation priorities.
Research suggests the Earth's paleoclimate history indicates a more sensitive climate than thought, with temperatures far exceeding the Eemian period if global warming is not abated. A 2°C warming target could lead to drastic changes, including multiple meters of sea level rise and significant ice sheet loss in Greenland and Antarctica.
Researchers at Brown University found a significant link between climate change and the Norse settlements' disappearance in Greenland. The Little Ice Age, which began in the 1400s, is believed to have played a major role in their demise.
A new method using leaf size and shape traits reconstructs past climates over 120 million years with improved accuracy. The study, funded by NSF, offers strong improvements in precision over existing models.
New research suggests that ancient trash mounds, or middens, left behind by prehistoric humans may be responsible for the formation of tree islands in the Florida Everglades. These elevated areas allowed trees to grow and provided a habitat for wildlife. Human disturbance is now threatening the existence of these unique ecosystems.
A new tree-ring chronology reconstructs the climate of pre-colonial Mexico on an annual basis for over a millennium, pinning down four ancient megadroughts to their exact years. The record provides insights into the rise and fall of pre-Hispanic civilizations, particularly the Aztecs and Mayans.
Researchers from eight nations are analyzing sedimentary deposits from a 460-meter deep borehole to reconstruct the climate history of the region. The drilling project aims to provide information on past environmental changes in the Bethlehem area, including those related to early human migration.
Eric J. Essene, George E. Gehrels, and Dana L. Royer received the Penrose, Day, and Donath Medals for their groundbreaking research in metamorphic petrology, U-Th-Pb geochronology, and paleoclimatology.
Geochemical analysis of rare ancient soils provides new data on Central Africa's paleoclimate during the Late Jurassic period. The findings indicate an extremely arid climate with minimal rainfall and few vegetation species, contrasting with the lush tropical rainforest it is today.
A new study reconstructs Arctic summer temperatures over 1,600 years, showing that recent warming is more anomalous than previously documented. The study agrees with climate models and indicates that the Arctic's sensitivity to climate change will continue into the next century.
Researchers reconstruct past hurricane activity in the Atlantic Ocean, indicating a high period of hurricane activity during the Medieval Climate Anomaly around AD 900-1100. The current low hurricane activity may be related to an emerging El Niño event, which can lead to more wind shear and fewer hurricanes.
Peter Wilf, a renowned paleobotanist, has been awarded the prestigious Distinguished Speaker honor by the Paleontological Society. His research on ancient plants and terrestrial ecosystems will be showcased through three lectures, shedding light on biodiversity, climate change, and extinction.
Researchers estimate that the 60-million-year-old Titanoboa cerrejonensis snake would have required an average annual temperature of 30-34°C to survive. Its size is comparable to that of today's anacondas and reticulated pythons, but its discovery challenges our understanding of climate and species adaptation.
The Geosphere journal features two studies: one on climate change in the southwestern US from 17-6 million years ago, and another on the evolution of the South Balkan extensional system. The climate study used sedimentation and erosion history to interpret changes in ocean circulation and North American monsoon activity.
A team of researchers used oceanographic data to predict the potential consequences of climate change on a global scale. They found that if current trends continue, altered ocean circulation could lead to dramatic implications for the world's climate and biosphere.
Researchers reconstructed Arctic climate patterns over 65 million years, revealing a link between Arctic cooling and global cooling. Changes in ocean circulation could lead to abrupt changes in climate, similar to those that occurred at the onset of the last ice age.
Researchers discovered three periods of high vegetation cover in the Sahara Desert over the past 120,000 years, tied to changes in Earth's rotation axis and increased precipitation. Computer model simulations support these findings, suggesting a potential expansion of vegetation in the region under human-driven climate change.
A long-term study of mammal fossils in northern Pakistan reveals a significant decline in diversity after climate change precipitated a shift in vegetation. The research, spanning 5 million years, shows that mammals that relied on fruit and browse disappeared early, while those that ate grass adapted or went extinct.
Recent studies shed new light on the late Paleozoic ice age, revealing a dynamic icehouse regime and challenging traditional interpretations. This improved understanding can aid in preparing for rising atmospheric carbon dioxide levels and global temperature increases.
A 120-foot sediment core from the Gulf of Guinea reveals a 155,000-year record of continuous monsoon history, tied to Northern Hemisphere climate shifts and local solar radiation. The study demonstrates the sensitivity of the monsoon region to global climate conditions.
Researchers have gathered quantitative temperature data from arctic lake sediments and glaciers, revealing temperatures five degrees warmer than today. This finding provides a climate analogue to inform future predictions, highlighting the exceptional magnitude and rate of warming in the Arctic.
Researchers from Indiana University and Royal Netherlands Institute for Sea Research found evidence of dramatic climate changes during the Mesozoic Era, with temperature variations ranging from 30 deg C to 36 deg C. The discovery suggests that global fluctuations in carbon cycling played a significant role in shaping ancient climates.
Researchers identify a previously unrecognized link between mid-latitude climate dynamics and tropical African climate, leading to exceptionally high organic carbon burial. The study suggests that changes in atmospheric pressure systems and surface winds drive variations in precipitation and runoff patterns.
Scientists have found that temperature variations are more intimately linked across time scales than previously thought. The researchers used measurements from corals, ice cores, and sediment cores to estimate past temperatures, revealing a stronger connection between annual and decadal cycles.
A new study suggests that natural climate change may be more significant than previously thought, with a notable cold period in the 17th century and similarities between historical reconstructions and computer simulations. The findings highlight the importance of considering natural variability in future climate scenarios.
The thermohaline circulation plays a vital role in maintaining current climate patterns. A shutdown could lead to regional climate change and extreme weather events in eastern North America and western Europe.
Ocean drilling research advances understanding of rapid climate change, including the Paleocene-Eocene Thermal Maximum. The study also explores climate triggers and effects on various scales, from tectonic uplift to human history. Additionally, new findings challenge traditional theories on volcanic regions.
Leading climate scientists endorse the position on climate change and greenhouse gases taken by AGU in 1998, stating that natural factors cannot fully explain recent warming. They argue that proxy data must be assessed for temperature variability and hemispheric mean temperature should be distinguished from regional temperature anomalies.
Researchers used coral reefs to study the impact of hurricanes on ocean health and climate patterns. By comparing high- and low-frequency hurricane areas, they established a model for analyzing older fossil reefs.
A team of paleoecologists from Amsterdam used pollen grains to accurately recreate the local climate in Southern Mexico and Northern Guatemala around 1000 AD. The study suggests that the collapse of the well-organised Maya empire led to widespread destruction of wildlife and agricultural areas, resulting in a drier climate.
Researchers reconstruct past temperature changes using high-precision equipment, revealing a 4.5F warmer climate 5000 years ago and a 2F colder Little Ice Age. The region surrounding the North Atlantic Ocean is particularly sensitive to climatic changes due to ocean circulation patterns.
A team of researchers, led by Maureen E. Raymo, have discovered millennial-scale climate instabilities that existed much further back in time than previously thought. These rapid climate fluctuations were found to be tied to changes in ocean circulation and heat transfer.
Researchers use numerical simulations to show connection between Earth's changing shape and gravitational effects of other bodies in the Solar System. The study reveals that changes in the Earth's axial tilt can produce large changes in climate.