Articles tagged with Ice Core Records
Researchers have developed a machine learning model to predict geothermal heat flux beneath the Greenland Ice Sheet, revealing an anomalously high heat flux in northern regions. The study uses 22 geologic variables to improve ice-mass loss and global sea-level rise predictions.
A team of 98 scientists from 22 countries compiled a comprehensive database of past global temperature records spanning 1 CE to the present. The PAGES2k 2,000 Year Multiproxy Database contains 692 records from 648 locations, providing the largest body of climate records with high temporal resolution.
Researchers are uncovering long-lost weather diaries and ship logbooks to improve future climate projections and validate palaeoclimate records. These new datasets contribute to global models of the atmosphere, shedding light on Australia's climatic past.
Researchers have compiled a 30-year data set to construct the first ice core-based record of atmospheric oxygen concentrations spanning 800,000 years. The study shows that atmospheric oxygen has declined by 0.7 percent relative to current concentrations, primarily due to fossil fuel burning.
A new analysis of global data reveals that global area burned has seen an overall slight decline over past decades, with around 4% of the global land surface affected by vegetation fires each year. The researchers also found that there is increasing evidence that there is less fire in the global landscape today than centuries ago.
A recent study by University of Montana researcher Jesse Johnson reveals that geothermal heat enhances rapid ice flow and subglacial melting in northern Greenland. The research, published in Nature Geoscience, identifies a west-to-east zone with anomalously high heat that drives widespread melting and rapid ice flow.
Researchers found that a global methane plateau between 1999 and 2006 was caused by lower industrial emissions, but ended when biogenic sources, such as agriculture, increased. The study suggests that agricultural activity may be a key contributor to the resumed increases in atmospheric methane levels.
A new statistical technique confirms that man-made CO2 and methane emissions cause global warming, particularly in densely populated regions. The study provides complementary support to model-based studies and highlights the need for further research on regional climate dynamics.
A multidisciplinary team has reconstructed past environments in the Cantabrian Region over a period of nearly 35,000 years using marine microfauna, small vertebrates and stable isotopes. The study confirms a series of warm and cold events during the Upper Pleistocene, providing insights into human adaptation strategies.
Researchers investigated ocean temperature changes over centuries using climate models and fossil records. They found that volcanic eruptions caused progressive cooling until the Industrial Revolution, which marked a shift towards global warming. Understanding past climate patterns can provide insights into future climate changes.
A new study reorders the timing of nearly 300 major volcanic eruptions worldwide and reveals their significant impact on global climate. The analysis resolves longstanding inconsistencies between historic atmospheric sulfate data and corresponding temperature data, shedding light on centuries of cold temperature extremes.
Researchers found that thawing Arctic permafrost soil may have released large amounts of carbon dioxide and other greenhouse gases into the atmosphere around 14,600 years ago. The study suggests that this process could have amplified initial warming through positive feedback, similar to current effects of permafrost thawing in Siberia.
The University of Wisconsin-Madison is renowned for its expertise in drilling through ice sheets, playing a critical role in advancing astronomy and understanding climate change. Researchers have successfully extracted ancient climate data from cores, providing valuable insights into the Earth's past.
Scientists have found a discrepancy between global temperature trends over the last 10,000 years, with some data suggesting cooling and climate models predicting warming. The Holocene temperature conundrum has important implications for understanding climate change and evaluating climate models.
Researchers mapped a large aquifer in southeast Greenland using Operation IceBridge radar data, covering an area larger than West Virginia, with the potential to raise sea levels by 0.016 inches per inch. The perennial aquifer is a heat reservoir for the ice sheet, and its filling and discharging mechanisms are not yet fully understood.
IceBridge collected data on many facets of Antarctic land and sea ice, including ice elevation and thickness. The mission also took measurements of sea ice in the Ross Sea, an area with comparatively little attention compared to other parts of the Southern Ocean.
A 2,000-year climate record reveals a long-term cooling trend that ended in the 19th century, reversing with global warming since then. The study aggregates proxy data from various sources, including tree rings and lake sediments, to provide insights into natural factors driving climate change.
Scientists have discovered a complete geomagnetic field reversal 41,000 years ago in Black Sea sediments, which was associated with rapid climate changes and a massive volcanic eruption. The reversal lasted only 440 years and led to a significant increase in radiation exposure due to a weaker magnetic field.
Researchers have observed a dramatic increase in Greenland's ice sheet surface melting, with nearly the entire ice cover experiencing melting. The melting event was linked to an unusually strong heat dome over Greenland, causing temperatures to hover above freezing for several hours.
A team of scientists from 14 countries has successfully drilled through a mile and half of the Greenland ice sheet in search of climate change insights. The ice core samples may offer valuable information about how the world can change during periods of abrupt warming.
A new 2,000-year-long reconstruction of sea surface temperatures in the Indo-Pacific warm pool suggests temperatures may have been as warm during the Medieval Warm Period as they are today. This study contributes to scientists' efforts towards improving global temperature reconstructions.
A new study finds that abrupt changes in climate may lead to shifts in monsoon patterns, resulting in lower vegetation growth, drier tropics, and increased wildfires. The research used oxygen isotopes in air from ice cores and ancient stalagmites to support these findings.
Researchers confirm that surface temperatures in the Northern Hemisphere were warmer over the last 10 years than any time during the last 1300 years. The study uses a variety of proxy data, including tree rings, marine and lake sediment cores, ice cores, and coral cores, to derive a long-term temperature record.
Scientists have confirmed the link between greenhouse gas levels and global warming with new analysis of Antarctic ice cores extending back 800,000 years. The study reveals that current concentrations of carbon dioxide and methane are unprecedented in the past.
Researchers found that high-altitude ice fields, like Mont Blanc and Dôme du Goûter, have remained stable in mass balance over the last 100 years. The accumulation of snow and ice has varied little since the beginning of the 20th century, indicating a lack of significant melting due to climate change.
A NASA study suggests that a warmer future climate will increase droughts in the southwest United States and other parts of the world. The researchers found that changes in solar output in the past increased surface warming and altered atmospheric moisture and circulations, leading to severe droughts.
Researchers from Ohio State University and international partners assembled a 50-year record of snowfall in Antarctica, contradicting assumptions in some climate change models. The study suggests that global sea levels have not been slowed by a thickening of ice sheets.
Researchers have expanded the view of climate history by analyzing new ice cores that provide a record of atmospheric conditions up to 650,000 years. The study suggests that current conditions are a distinct anomaly and may be linked to human influence on greenhouse gases.
Researchers found that increased solar radiation affects calcium and sodium deposition in Antarctica, indicating a link between solar activity and climate. This discovery sheds light on the Earth's climate system without accounting for human impacts.
The NGRIP ice core project has uncovered a detailed record of North Greenland's climate history, revealing stable temperatures during the Eemian period and a slow transition to the glacial period. The study also suggests significant temperature jumps in recent times, with evidence of abrupt climate shifts over human lifetimes.
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.
The analysis of three Himalayan ice cores reveals a highly detailed record of the last 1,000 years of earth's climate in the high Tibetan Plateau. The data shows that both the last decade and the last 50 years were the warmest in 1,000 years, with at least eight major droughts caused by a failure of the South Asian Monsoon.
A new review paper by University of Colorado at Boulder researcher Mark Serreze and nine co-authors confirms that Arctic temperatures have warmed to the highest levels in four centuries, largely due to human activity. The study also highlights the degradation of climate data from the region, threatening long-term monitoring efforts.
Researchers found that the 20th century warming counters a 1,000-year-long cooling trend and reversed a medieval warming period. Temperatures in the latter half of the 20th century were unprecedented, with human-induced greenhouse gases being a major factor.
Research by University of Cincinnati geologist Thomas Lowell reveals that the ice sheet advances over land marched in step with the iceberg calving events over the ocean. The findings suggest that both land and sea events are responding to global cooling, reinforcing the pattern rather than initiating the change.
Researchers at Ohio State University have retrieved the first ice cores from the Dasuopu Glacier, a 40-meter-wide ice field on the Tibetan Plateau. The cores contain glacial stage ice dating back at least 12,000 years and are expected to provide valuable insights into the monsoonal climate system.
A thousand-foot-long ice core from the Tibetan Plateau provides a detailed climate record for the last 130,000 years, with some sections dating back potentially over 500,000 years. The analysis reveals significant changes in temperature and greenhouse gas levels during this time period.
Research suggests that ocean heat transport, rather than Milankovitch cycles, is driving the cooling trend in Greenland's climate. The thermometers from the Greenland ice cores indicate that summers have cooled and winters have warmed over the past 8,000 years.