Sentences with phrase «ice core»

Camp Century was known to Colgan and other glaciologists as the site where the first deep ice core was drilled.

After drilling ice core containing thousands of years of accumulated caribou dung (shown above), scientists recovered the complete genome of a DNA virus and the partial genome of an RNA virus from frozen feces dated to 700 years old, they report online today in the Proceedings of the National Academy of Sciences.

Patrick Crill, an American biogeochemist at Stockholm University, says ice core data from the past 800,000 years, covering about eight glacial and interglacial cycles, show atmospheric methane concentrations between 350 and 800 parts per billion in glacial and interglacial periods, respectively.

In 1959, the U.S. Army Corps of Engineers built the subterranean city under the guise of conducting polar research — and scientists there did drill the first ice core ever used to study climate.

As curator of the National Ice Core Laboratory, his job is to keep ice cores from Antarctica and Greenland frozen.

That information can be compared to stalagmite and ice core climate records obtained elsewhere in the world.

European glaciologists drilling an ice core from the highest point of the Greenland ice sheet expect to reach bedrock, 3050 metres below, this week.

Crucially, they also found that an ice core extending that far into the past should be between 2.4 and 3 - km long, shorter than the 800,000 - year - old core drilled in the previous expedition.

This isn't as surprising because we have one ice core with a very high reading.

The GRIP ice core is a unique archive of past climate and atmospheric chemistry which will improve climate models.

The change is most noticeable on the Guliya Ice Cap, where they drilled the latest ice core.

Or trekking to Antarctica to collect ice core samples.

However, drilling deeper to collect a longer ice core does not necessarily mean finding a core that extends further into the past.

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

One evening, while drinking a whiskey on rocks chipped off an ice core sample, Lorius watched bubbles get liberated from the ice.

The Russians had drilled to a depth of over 2,000 meters and recovered an ice core that went back 420,000 years.

He pointed to an ice core taken from East Antarctica's Lake Vostok, which lies underneath the ice sheet.

Ambrose also cites Greenland ice core data that suggest sulfur stuck around in the atmosphere longer than just a few years and that Earth had already entered a cold snap.

He returned to Antarctica in 1964 for nine months to test ice core drills.

He would capture the essence of the meeting and outline a cohesive course of action that would progress ice core research.

Under his leadership, the field of ice core research took cohesive shape.

Through the NSF - funded South Pole Ice Core (SPICECore) project, researchers drill deep into the ice to extract ice cores.

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

DNA sequences from organic material near the bottom of an ice core imply that a conifer forest covered southern Greenland hundreds of thousands of years ago.

However, the carbon dioxide concentration in the atmosphere — roughly 290 ppm (parts per million)-- was ca. 110 ppm lower than the current level, as ice core data from the Antarctic shows.

Ice core data from the poles clearly show dramatic swings in average global temperatures, but researchers still don't know how local ecosystems reacted to the change.

This mission represented the first stage in demonstrating the feasibility of the «ice core archive» project.

Geoscientist John Higgins (right) of Princeton University and his team drilled at three sites, hauling tents and equipment, such as a drill bit filled with an ice core.

«The WAIS Divide ice core allows us to identify each of the past 30,000 years of snowfall in individual layers of ice, thus enabling detailed examination of conditions during deglaciation,» said Paul Cutler, NSF Polar Programs» glaciology program manager.

Extraction of the WAIS - Divide ice core and analysis in DRI's laboratory were funded by the U.S. National Science Foundation (NSF).

Another thing that ice core showed, as others have before, is that the great swing in temperature between glacial and interglacial periods was invariably accompanied by great swings in the amount of greenhouse gases in the atmosphere: When the greenhouse goes up, the ice sheets go down.

Similar to tree rings, evidence preserved in each layer of ice can provide climate information for a specific time in the past at the site where the ice core was taken.

The International Partnerships in Ice Core Sciences (IPICS) aims to identify a suitable site to drill a core representing Antarctica's oldest ice in the next two years.

One such ice core, known as the West Antarctic Ice Sheet Divide (WAIS Divide) core was drilled to a depth of more than two miles (3,405 meters), and much of it was analyzed in the DRI Ultra-Trace Laboratory for more than 30 different elements and chemical species.

They obtained it by drilling the oldest ice core ever, almost two miles into a godforsaken spot called Dome C — 600 miles inland from the Antarctic coast and a little more than 1,000 miles from the South Pole.

New ice core research suggests that, while the changes are dramatic, they can not be attributed with confidence to human - caused global warming, said Eric Steig, a University of Washington professor of Earth and space sciences.

Enter a new breed of drill, designed to do fast, cheap reconnaissance instead of extracting a single, intact ice core, as previous deep drills have done.

Levels of oxygen 18 in ice core samples from the 1990s were more elevated than for any other time in the last 200 years, but were very similar to levels reached during some earlier decades.

But the ice core - derived climate records from the Andes are also impacted from the west — specifically by El Niño, a temporary change in climate, which is driven by sea surface temperatures in the tropical Pacific.

«The anomaly was detected in much more limited measurements of the Byrd ice core in the 1990s,» notes McConnell, «but exactly what it was or what created it wasn't clear.

Before 1 million years ago, the cycle occurred every 40,000 years (L. E. Lisiecki and M. E. Raymo Paleoceanography 20, PA1003; 2005), so scientists want an ice core that is twice as old as EPICA to better understand this transition.

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.»

McConnell's ice core laboratory enables high - resolution measurements of ice cores extracted from remote regions of the Earth, such as Greenland and Antarctica.

The ice core data also shows that CO2 and methane levels have been remarkably stable in Antarctica — varying between 300 ppm and 180 ppm — over that entire period and that shifts in levels of these gases took at least 800 years, compared to the roughly 100 years in which humans have increased atmospheric CO2 levels to their present high.

Sean Mackay uses a manual drill to obtain an ice core sample while Marchant looks on.

Why do some ice core samples seem to indicate CO2 spikes trailed increases in global temperature?

Today we had to excavate an ice core from a patch of buried ice we uncovered yesterday.

Volk: Yeah, so Icille was released into Earth's biosphere at the same time Dave was, from a limestone, from the calcium carbonate of a limestone cliff in the Dordogne valley of southern France about the same time that we have the earliest, very earliest cave art in the human prehistory; but Icille didn't last very long in the biosphere, she got trapped in this ice core.

IceBridge's flight lines often intersect ice core sites where other scientists have analyzed the ice's chemical composition to map and date layers in the ice.

The researchers determined from the isotope ratio that the Taylor Glacier samples were 120,000 years old, and validated the estimate by comparing the results to well - dated ice core measurements of atmospheric methane and oxygen from that same period.