Sentences with phrase «ancient air bubbles»

A small problem here: we measure 180 - 300 ppmv CO2 in the ancient air bubbles, but our present outside air is already near 400 ppmv.

Data has also been gathered from ice cores that contain ancient air bubbles.

Not exact matches

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.

Scientists can determine ancient atmospheric concentrations by measuring CO2 and methane levels in tiny air bubbles trapped in such ice, formed when the ice fell to the earth as snow.

Confirmation of this idea requires a direct record of the ancient atmosphere — and this can be recovered by analysing the air that became trapped in tiny bubbles within ice as the snow it formed from fell to Earth.

A new study shows that as a glacier's ice melts, bubbles of pressurized ancient air escape into the water, leading to noise levels even louder than those beneath rain - pounded seas heaving with 6 - meter waves.

Scientists know that from studying air bubbles trapped in ancient ice in Greenland and Antarctica.

Locked in bubbles of ancient air trapped in glaciers is a precise record of carbon dioxide stretching back 160,000 years.

When the ice from a certain layer is crushed — say, a layer known to be 2,000 years old — tiny bubbles of ancient air are released, the composition of which reflects the composition of the atmosphere 2,000 years ago.

A given year's snowfall is compacted into ice during the ensuing years, trapping air bubbles, and so paleoclimate researchers have been able to glimpse ancient climates in some detail.

These clues include the earlier spring arrivals of migrating birds, earlier blooming of wildflowers and Washington DC's cherry trees, melting glaciers and icecaps, micro-fossils from cores of mud from the ocean floor, and bubbles of ancient air retrieved from cores of glacial ice.

Hints that warming is being caused by emissions from industry and other human activities have been extracted from air bubbles trapped in ancient ice, from variations in tree rings, from the quick retreat of alpine glaciers.

They drill down into glaciers and study the bubbles of air trapped in ancient ice to find more information that can either prove or disprove an important hypothesis.

The most direct evidence comes from tiny bubbles of ancient air trapped in the vast ice sheets of Antarctica.