Sentences with phrase «ice cores a record of»

Composite ice core records of lead in Antarctica from 1600 to 2010.

Sigl, M., J. R. McConnell, L. Layman, O. Maselli, K. McGwire, D. Pasteris, D. Dahl - Jensen, J.P. Steffensen, R. Edwards, R. Mulvaney (2013) A new bipolar ice core record of volcanism from WAIS Divide and NEEM and implications for climate forcing of the last 2000 years, J. Geophys.

An independent, annually dated ice core record of explosive volcanism from WAIS Divide synchronized to EPICA Dome C over the last 27,000 years.

A new bipolar ice core record of volcanism from WAIS Divide and NEEM and implications for climate forcing of the last 2000 years.

Ice core records of the evolution of atmospheric methane in the Holocene.

How do Vostok, Dome C and other Antarctic and Greenland ice core records of historic levels of atmospheric CO2 compare with changes in THC and the AMO?

Current concentrations of atmospheric carbon dioxide and methane far exceed pre-industrial values found in polar ice core records of atmospheric composition dating back 650,000 years.

The ice core record of the last 420,000 years shows exactly the opposite.

Finally, I've throughly analyzed the GISP2 ice core record of periodic and quasi-periodic phenomena.

In the ice core records of the ice ages, it appears that CO2 levels may follow temperature increases, rather than vice versa.»

[13] Hubertus Fischer, Martin Wahlen, Jesse Smith, Derek Mastroianni, Bruce Deck, «Ice Core Records of Atmospheric CO2 around the Last Three Glacial Terminations,» Science, vol.

There appear to be no significant CH4 - excursions in ice core records of Antarctica or Greenland during these time periods which otherwise might serve as evidence for a massive release of methane into the atmosphere from degrading permafrost terrains.

That would make ice cores a record of those specific locations rather than a broader measure of the sea where the evaporation occurred.

He felt the Vostok ice core records of CO2 and temperature as presented in the movie were «a pretty good match,» and asked Chevron's counsel to comment on that.

According to Ruddiman (not a direct link to the literature), it was actually the release of methane from rice paddies and other forms of agriculture starting about 5,000 years ago that prevented the same sort of fairly rapid decay in temperature seen in the Vostok ice core record of previous interglacials.

Atmospheric mercury deposition during the last 270 years: A glacial ice core record of natural and anthropogenic sources

Figure 1: Antarctic (Vostok) ice core records of temperature, CO2 (upper) and CH4 (lower) including time - scale adjustment to account for ice - gas age difference associated with the time for air bubbles to be sealed (Petit et al. 1999) and corrected for variations of climate in the water vapor source regions (Vimeux et al. 2002) as described in Supporting Text of Hansen and Sato (2004).

Not exact matches

Australian scientists have welcomed the success of a five - year Greenland ice core drilling project that is expected to reveal a record of more than 130 000 years and provide an insight into future global climate.

Researchers established the first camp here in 1989, at the start of an international effort that drilled the 3,053 - meter - long Greenland Ice Sheet Project - 2 ice core, retrieving a record of climate over the previous 110,000 yeaIce Sheet Project - 2 ice core, retrieving a record of climate over the previous 110,000 yeaice core, retrieving a record of climate over the previous 110,000 years.

Record of melt from two west Greenland ice cores showing that modern melt rates (red) are higher than at any time in the record since at least 1550 CE (bRecord of melt from two west Greenland ice cores showing that modern melt rates (red) are higher than at any time in the record since at least 1550 CE (brecord since at least 1550 CE (black).

«While concentrations measured in Antarctic ice cores are very low, the records show that atmospheric concentrations and deposition rates increased approximately six-fold in the late 1880s, coincident with the start of mining at Broken Hill in southern Australia and smelting at nearby Port Pirie.»

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

Ice core records show atmospheric methane levels plunged from about 700 parts per billion to just 500 ppb at the time of their extinction.

«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.

In Greenland lead isotopes in ice cores reveal a record of lead pollution from Roman smelting in Spain some 2,000 years ago.

«That's the other remarkable thing about this research,» said Osterberg, «not only are we seeing strong agreement between the two Denali cores, we are finding the same story of intensified storminess recorded in ice cores collected 13 years and 400 miles apart.»

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.

It's OK to state that, «The common belief that carbon dioxide is driving climate change is at odds with much of the available scientific data: data from weather balloons and satellites, from ice core surveys, and from the historical temperature records» when this is clearly untrue.

To get to the bottom of things, he mapped the ages and locations of 1,323 woolly mammoth remains and 576 archaeological sites, and he merged them with data from plant and pollen records, and climate change information from ice cores in Greenland.

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

«That is very exciting because a lot of interesting things happened with Earth's climate prior to 800,000 years ago that we currently can not study in the ice core record.»

Researchers have a record of atmospheric carbon dioxide stretching back millions of years thanks to ice cores from Antarctica, which contain trapped gas bubbles, snapshots of ancient air.

The team of researchers examined the hydroclimatic and societal impacts in Egypt of a sequence of tropical and high - latitude volcanic eruptions spanning the past 2,500 years, as known from modern ice - core records.

«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.

Records of nitric acid and carbon - 14 in ice cores show that we have not had a solar flare bigger than the 1859 «Carrington event» since 1561.

As yet, no one has touched the waters of a subglacial lake with so much as a drill bit, but a Russian group that has been coring ice over Lake Vostok to get ancient climate records is coming close.

Most previous Antarctic ice core records have not included many of the elements and chemical species that we study, such as heavy metals and rare earth elements, that characterize the anomaly — so in many ways these other studies were blind to the Mt. Takahe event.»

Finally, Manning and colleagues pored over historical texts from Ptolemaic Egypt, comparing periods of unrest with the volcanic record in the ice cores.

Ice keeps a record of environmental changes as it accumulates over thousands of years, so the longer the core, the better.

In 2005, the European Consortium for Ice Coring in Antarctica (EPICA) drilled an ice core in Dome C on east Antarctica's plateau that stretches our record of the ancient atmosphere back 800,000 years (Quaternary Science Reviews, DOI: 10.1016 / j.quascirev.2010.10.00Ice Coring in Antarctica (EPICA) drilled an ice core in Dome C on east Antarctica's plateau that stretches our record of the ancient atmosphere back 800,000 years (Quaternary Science Reviews, DOI: 10.1016 / j.quascirev.2010.10.00ice core in Dome C on east Antarctica's plateau that stretches our record of the ancient atmosphere back 800,000 years (Quaternary Science Reviews, DOI: 10.1016 / j.quascirev.2010.10.002).

To piece together this puzzle, Yale University historian Joseph Manning and his colleagues first compared records of Nile River heights dating back to A.D. 622 with volcanic eruptions recorded in ice cores from Greenland and Antarctica that date back 2,500 years.

Current research methods such as ice - core drilling can produce high - quality records of aerosols and soot going back centuries and even millennia, he says, and «these written accounts provide a good complement» to the data.

In the past decade, paleoclimatologists have reconstructed a record of climate change over the last millennium by consulting historical documents and examining indicators of temperature change like tree rings, as well as oxygen isotopes in ice cores and coral skeletons.

That record of CO2 levels and temperature, called the European Project for Ice Coring in Antarctica (EPICA) core, was published in Nature in 2004.

Modeler Bette Otto - Bliesner of the National Center for Atmospheric Research in Boulder and paleoclimatologist Jonathan Overpeck of the University of Arizona matched results from the Community Climate System Model and climate records preserved in ice cores, exposed coral reefs, fossilized pollen and the chemical makeup of shells to determine the accuracy of the computer simulation.

The ice core provides a complete record of the climate in the northern hemisphere over the past 250 000 years.

Utilizing the high resolution of the measurements, the team was able to detect methane fingerprints from the Southern Hemisphere that don't match temperature records from Greenland ice cores.

Understanding how that would affect the climate will require going beyond historical records of climate change, or even the information encoded in tree rings or ice cores, to what scientists call «deep time» records of conditions on Earth, according to a new NAS analysis.

The paleoclimate data, which included mainly changes in the oxygen isotopes of the calcium carbonate deposits, were then compared to similar records from other caves, ice cores, and sediment records as well as model predictions for water availability in the Middle East and west central Asia today and into the future.

Ice core records are rich archives of the climate history during glacial - interglacial cycles over timescales of up to ~ 800 kyr before the current age.