Sentences with phrase «from ice core studies»

What's more, scientists have detailed records of past CO2 levels from ice core studies, which show that CO2 levels are higher today than at any point since our distant ancestors began migrating out of Africa 800,000 years ago.

Not exact matches

The researchers studied temperature measurements over the last 150 years, ice core data from Greenland from the interglacial period 12,000 years ago, for the ice age 120,000 years ago, ice core data from Antarctica, which goes back 800,000 years, as well as data from ocean sediment cores going back 5 million years.

For this study, researchers from Dartmouth and Boise State University spent two months on snowmobiles to collect seven ice cores from the remote «percolation zone» of the West Greenland Ice Sheice cores from the remote «percolation zone» of the West Greenland Ice SheIce Sheet.

«In any case, the results of our model study give a clear indication that the bipolar variability of sulfate deposits must be taken into consideration if the traces of large volcanic eruptions are to be deduced from ice cores,» says Dr. Krüger, «Several research groups that deal with this issue have already contacted us to verify their data through our model results.»

Tas van Ommen and Vin Morgan of the Australian Antarctic Division studied snowfall records in ice cores from East Antarctica's Law Dome.

A unique study of frozen ice cores from the Tibetan Himalayas has shown that international agreements on phasing out the use of toxic persistent organic pollutants are working.

«The ice cores obtained through international collaborations were critical to the success of this study in that they allowed us to develop records from parts of Antarctica not often visited by U.S. - based scientists,» said co-author Tom Neumann of NASA's Goddard Space Flight Center in Greenbelt, Maryland, who participated in a Norway - U.S. traverse that collected several of the cores used in this study.

The two ice cores from Denali benefited from high levels of snowfall, providing what Osterberg says is «amazing reproducibility» of the climate record and giving the researchers exceptional confidence in the study results.

Meanwhile striking news came from studies of ancient climates recorded in Antarctic ice cores.

«Ice cores only tell you about temperatures in Antarctica,» Shakun notes of previous studies that relied exclusively on an ice core from Antarctica that records atmospheric conditions over the last 800,000 yeaIce cores only tell you about temperatures in Antarctica,» Shakun notes of previous studies that relied exclusively on an ice core from Antarctica that records atmospheric conditions over the last 800,000 yeaice core from Antarctica that records atmospheric conditions over the last 800,000 years.

Abbott, from the Lamont - Doherty Earth Observatory of Columbia University, and her colleagues studied layers of Arctic ice cores dating to that time and found tiny carbon spheres, which they believe formed during the heat and pressure of a cosmic impact.

Researchers at the Ohio State University are using a set of ice cores taken from Quelccaya as a «Rosetta Stone» for studying other ice cores taken from around the world.

Studying ice cores from central Greenland, McConnell and his colleagues measured black carbon levels from 1788 to 2002.

The sediment cores used in this study cover a period when the planet went through many climate cycles driven by variations in Earth's orbit, from extreme glacial periods such as the Last Glacial Maximum about 20,000 years ago, when massive ice sheets covered the northern parts of Europe and North America, to relatively warm interglacial periods with climates more like today's.

To investigate the climate changes of the past, the scientists are studying drill cores from the eternal ice.

A new study from Indiana University - Purdue University Indianapolis validates that the central core of the East Antarctic ice sheet should remain stable even if the West Antarctic ice sheet melts.

Team members taking a short ice core to study properties of sediment coming from the East Antarctic ice sheet.

The study, by an international team of scientists led by the University of Cambridge, examined how changes in ocean currents in the Atlantic Ocean were related to climate conditions in the northern hemisphere during the last ice age, by examining data from ice cores and fossilised plankton shells.

The new evidence has the potential to alter perceptions about which planets in the universe could sustain life and may mean that humans are having an even greater impact on levels of CO2 in Earth's atmosphere than accepted evidence from climate history studies of ice cores suggests.

The new study used ice cores to estimate annual snow accumulation from 1712 to 2010 along West Antarctica's coast.

For the new study, researchers collected two ice cores from Ellsworth Land, the strip of land that connects the Antarctic Peninsula to the rest of the continent.

The simple fact is that every scientist now involved in climate science, from the study of isotope ratios in deep ice cores to the emission of methane from tropical forests, is not only a scientist, but a political commentator and activist.

study published June 25 by the Proceedings of the National Academy of Sciences, the Greenland ice core drifts notably from other records of Northern Hemisphere temperatures during the Younger Dryas, a period beginning nearly 13,000 years ago of cooling so abrupt it's believed to be unmatched since.

Previous studies suggest that natural geologic methane emissions of the past are at least as high as natural emissions today, so studying the ancient ice cores allows researchers to accurately determine the upper limit of geologic emissions, separate from their anthropogenic counterparts.

«Most ice cores are collected from the middle of the ice sheet where it rarely ever melts, or on the ice sheet edge where the meltwater flows into the ocean,» Karina Graeter, the lead author of the study as a graduate student in Dartmouth's Department of Earth Sciences, said in a statement.

Amidst the continuous chatter in the blogosphere about the strengths and limitations about «multiproxy» studies, these studies may be a refreshing return to simpler methods relying on just one type of «proxy»: data from ice cores.

Not to mention that we KNOW levels of CO2 are higher than they have been in hundreds of thousands of years, and data from dendrochronology and ice core studies prove that high levels of CO2 are correlated with higher temperatures.

Time will tell of course — confirming studies from ice cores and independent analyses are already published, with more rumoured to be on their way.

But first here's more on this ice - core study and the broader context, including some great input from the wise and deeply experienced climate and ice researcher Richard Alley of Penn State.

This means that the current warming trend is qualitatively different from those we can study through ice cores etc., even if past warming was amplified by a CO2 feedback.

Meanwhile important news came from studies of ancient climates recorded in Antarctic ice cores, retrieved by a French and Russian team from one of the most inhospitable places on Earth.

A study using data taken from fossils and ice cores finds that long - term temperature variability decreased four-fold from the Last Glacial Maximum (LGM) around 21,000 years ago to the start of the Holocene around 11,500 years ago.

At left is Meredith Hastings of Brown University, the lead author of the study, accompanied by Bella Bergeron from Ice Coring and Drilling Services.

Through a combination of sediment cores analyses and ice - sheet modelling, the study shows that this area has probably been steadily leaking methane from hydrates for 8000 years.

Scientists extract ice cores from ice sheets and ice caps, studying them to learn about past changes in Earth's climate.

Study of the ice core recovered by Russian scientists from deep Antarctic holes has revealed that in the last 450,000 years the Earth has had at least four peaks of temperature upsurge with fluctuations of 10 to 12 degrees.

and «How well can we overcome the challenges of core proxy interpretations from ice cores taken from small polythermal valley glaciers through modern - process studies?»

Russian researchers made this discovery while studying ice cores recovered from the depth of 3.5 kilometres in Antarctica.

The organizing principles of climatology come from various threads, but I'd mention the oceanographic syntheses of Sverdrup and Stommel, the atmospheric syntheses of Charney and Lorenz, paleoclimatological studies from ice and mud core field work, and computational work starting with no less than John von Neumann.

It is the first study to directly link past glacial events with annual data from ice cores — cylindrical samples drilled from the glacier — extracted from the same ice mass.

It was the first comprehensive study combining data from many different archives of temperature including tree rings, ice cores, and coral reefs.

Atmospheric carbon dioxide levels closely correlated with global temperatures Atmospheric carbon dioxide levels closely correlated with global temperatures mongabay.com November 28, 2005 MONGABAY RESEARCH SUMMARY: Studying ice cores from Antarctica,...

Carbon dioxide is best studied in bubbles from Antarctic cores, where the ice is fewer potential contaminants than ice from Greenland; in general, see Alley (2000), p. 103.

A study by Thomas, Dennis et al 2009 [8] derived a high resolution temperature proxy record from oxygen isotope ratios from the ice core.

They collect ice cores in many locations around Earth to study regional climate variability and compare and differentiate that variability from global climate signals.

This storage facility also acts as a library: when scientists want to study a certain ice core from a particular region, they can apply to have a portion of the ice core sent to them for their studies.

The study is the result of combined efforts of researchers from the University of Cambridge, University of Exeter, and the British Antarctic Survey who were focused on studying Antarctica's past climate using moss banks instead of ice cores.

The new study gathered sea ice samples near Greenland in 2014 and 2015 that the researchers then analyzed in a lab, comparing them to previously gathered cores from there and elsewhere in the Arctic.

(28) + The emerging picture of severe instability was reinforced by studies of cores drilled from the Greenland and Antarctic ice caps, and by deep - sea cores that covered much longer times.

Paleoclimatological records are studies of past climate from records that are from proxy data, from ice cores, tree rings, sediments, and they go back thousands of years in the past.