Sentences with phrase «sea ice levels at»

According to the center, global sea ice levels at the end of 2008 were «near or slightly lower than» those of 1979.

Not exact matches

Warming temperatures have been chipping away at the Antarctic ice and contributing to sea level rise.

But when you compare it to the 7.3 metres (24 feet) that global sea levels are predicted to rise if the entire Greenland Ice Sheet were to melt away all at once... well, it puts things into perspective.

Because the martian air pressure is very low — 100 times lower than at sea level on Earth — ice on Mars does not melt and become liquid when it warms up.

According to the Center for Remote Sensing of Ice Sheets (CReSIS), an NSF Science and Technology Center led by the University of Kansas, the melt from Greenland's ice sheet contributes to global sea level rise at a rate of 0.52 millimeters annualIce Sheets (CReSIS), an NSF Science and Technology Center led by the University of Kansas, the melt from Greenland's ice sheet contributes to global sea level rise at a rate of 0.52 millimeters annualice sheet contributes to global sea level rise at a rate of 0.52 millimeters annually.

Understanding sea level change in relation to the mass balance of Greenland's and Antarctica's ice sheets is at the heart of the CReSIS mission.

In this study, the research team excavated intertidal beach sediments on the shoreline of Calvert Island, British Columbia, where the sea level was two to three meters lower than it is today at the end of the last ice age.

«Northern Hemisphere snow cover has decreased and Arctic Sea ice has been at record low levels in the past three years.»

Scientists from Rice University and Texas A&M University - Corpus Christi's Harte Research Institute for Gulf of Mexico Studies have discovered that Earth's sea level did not rise steadily but rather in sharp, punctuated bursts when the planet's glaciers melted during the period of global warming at the close of the last ice age.

Anthropogenic climate change and resulting sea level rise are now happening much more rapidly than at the transition from the last ice age to the modern global climate.

The risk is real: we know that the West Antarctic ice sheet has collapsed many times in the past, raising sea levels at least 3 metres.

«That isn't even close,» Harvard University geophysicist Jerry Mitrovica told attendees yesterday at the annual meeting of AAAS (which publishes Science) in Washington, D.C. «Each ice sheet has its own pattern of sea level rise.»

Even when sea levels were at their lowest, about 22,000 years ago at the height of the last ice age, the islands were likely out of the deer's swimming range.

A recent study by Robert Kopp at Princeton University (Nature, DOI: 10.1038 / nature08686) suggests sea levels were 8 to 9 metres higher than now during the last interglacial, in part due to the west Antarctic ice sheet melting.

This non-floating ice would have an eventual impact on sea levels, but only at a very modest rate.

New research indicates that climate change has triggered an unstoppable decay of the West Antarctic Ice Sheet, eventually leading to at least three meters of global sea level rise

Take Holland: It will be much more heavily influenced by Antarctic ice melt than by falling sea levels around Greenland, says Jerry Mitrovica, a geophysicist and sea level modeler at Harvard University.

If both ice sheets melted — a process already underway at an alarming rate in West Antarctica — global sea levels would rise 200 feet.

When parts of the ice melt, liquid water trickles to the base and this can lubricate the underside of the ice sheet, allowing it to slide more quickly into the sea and drive up sea levels at a faster rate.

Cantwell said that the science underway at DOE will be critical to understanding the impacts of the rising greenhouse - gas levels in the atmosphere — from Arctic sea - ice melt to ocean acidification — and maintaining US leadership in clean - energy technologies.

Given that we now have several years more data, we can essentially «test» the IPCC predictions and we arrive at the conclusion (i.e., message 1) that the climate system is tracking the «worst case scenario» (or worse in the case of ice melt and sea - level rise) presented by the IPCC.

Melting can be rapid: as the last ice age ended, the disappearance of the ice sheet covering North America increased sea level by more than a metre per century at times.

At a global scale, the increased melting of the ice sheet contributes to rising sea level and may impact global ocean circulation patterns through the so - called «thermohaline circulation'that sustains among others, the Gulf Stream, which keeps Europe warm.

Parts of the ice sheet considered at risk hold enough ice to raise the global sea level by 22 feet.

If the East Antarctic ice sheet, which is 10 times larger than the western ice sheet, melted completely, it would cause sea levels worldwide to rise almost 200 feet, according to Kathy Licht, an associate professor in the Department of Earth Sciences in the School of Science at IUPUI.

Sea levels have also risen due to melting glaciers and ice sheets at the poles.

The entire cave system flooded at the end of the last ice age, when melting glaciers raised sea levels.

Too much debate treats temperature (and especially the most recent global average) as the sole indicator, whereas many other factors are at play including sea levels, ocean acidity, ice sheets, ecosystem trends, and many more.

The great ice sheets of Greenland and Antarctica, which rise to over 13,000 feet above sea level, accumulate ice over most of their surfaces and melt only at their lower elevations near the edges.

When the planet's big ice sheets collapsed at the end of the last ice age, their melting caused global sea levels to rise as much as 100 meters in roughly 10,000 years, which is fast in geological time, Mann noted.

Our study suggests that at medium sea levels, powerful forces, such as the dramatic acceleration of polar ice cap melting, are not necessary to create abrupt climate shifts and temperature changes.»

The succession of temperature records has also been accompanied by other notable climate records, including thebiggest ever year - to - year jump in carbon dioxide levels at the Mauna Loa observatory in Hawaii, as well as a record low winter Arctic sea ice peak.

MELT ZONE The Totten ice shelf (shown here) holds back a massive glacier, which drains a France - sized portion of East Antarctica and could raise sea levels by at least 3.5 meters if it slides into the sea.

A new review analyzing three decades of research on the historic effects of melting polar ice sheets found that global sea levels have risen at least six meters, or about 20 feet, above present levels on multiple occasions over the past three million years.

Data published yesterday by scientists at the Jet Propulsion Laboratory (JPL) in Pasadena, California, and colleagues revealed that Earth's ice sheets are melting at a rate that could mean more than 32 centimeters of global sea level rise by 2050.

«By processing the historical archive acquired by the Danish during the last century, they were able to provide an estimation of the ice sheet contribution to sea - level rise since 1900, which was critically missing in the last IPCC report,» noted Jeremie Mouginot, a climate scientist at the University of California, Irvine.

«Modern atmospheric carbon dioxide levels are today equivalent to those about three million years ago, when sea level was at least six meters higher because the ice sheets were greatly reduced.

The world's biggest reserves of above - water ice are in Antarctica, and understanding the rate at which the ice sheet will slough into the sea could help researchers refine sea level rise forecasts.

A new study by scientists at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, and the University of California, Irvine, shows that while ice sheets and glaciers continue to melt, changes in weather and climate over the past decade have caused Earth's continents to soak up and store an extra 3.2 trillion tons of water in soils, lakes and underground aquifers, temporarily slowing the rate of sea level rise by about 20 percent.

«The primary uncertainty in sea level rise is what are the ice sheets going to do over the coming century,» said Mathieu Morlighem, an expert in ice sheet modeling at the University of California, Irvine, who led the paper along with dozens of other contributors from institutions around the world.

By the late 1990s, the extent of sea ice had fallen to its lowest level for at least 1400 years.

Global sea levels are rising at about 3 millimeters a year owing to warming waters and melting ice.

The consequences of global sea level rise could be even scarier than the worst - case scenarios predicted by the dominant climate models, which don't fully account for the fast breakup of ice sheets and glaciers, NASA scientists said today (Aug. 26) at a press briefing.

That means it sinks into the deeper layers of the ocean, and the contrast between this warm water and the undersea ice canyons contributes an unknown but substantial amount of sea level rise, said Josh Willis, an oceanographer at JPL in Pasadena, California.

When the model held the polar winds at a constant level, the sea ice increased only 20 percent as much.

As the volcanoes subsided and sea levels rose at the end of the last ice age, they were gradually submerged, leaving only the reefs behind.

The fact that ice sheets will respond to warming is not in doubt (note the 4 - 6 m sea level rise during the last interglacial), but the speed at which that might happen is highly uncertain, though the other story this week shows it is ongoing.

Co-author Dr Ivan Haigh, lecturer in coastal oceanography at the University of Southampton and also based at NOCS, adds: «Historical observations show a rising sea level from about 1800 as sea water warmed up and melt water from glaciers and ice fields flowed into the oceans.

In the past 15 years, the oceans have warmed, the amount of snow and ice has diminished and sea levels have risen, explains Lisa Goddard, an expert in climate variability at Columbia University.

I recently attended a seminar at UChicago where Michael Oppenhemier gave a talk on ice sheets and sea level rise.