Sentences with phrase «polar sea ice on»

Variations in polar sea ice on short time scales, up or down, are essentially meaningless, my contacts studying the cryosphere always stress.

Not exact matches

False assumptions on starvation «Unless you've been living under a rock the last few decades, you're aware that Arctic Sea ice is melting, and that this is potentially bad news for polar bears,» she said, adding that until now, the prevailing belief has been that «energy from food on land is largely inconsequential.»

Nineteen separate polar bear populations live throughout the Arctic, spending their winters and springs roaming on sea ice and hunting.

One «growing phenomenon in the Arctic [is] polar bears foraging on land as their primary habitat, sea ice, retreats,» Kintisch writes, which makes field work even more dangerous, and difficult, than it would be otherwise.

At a hamlet on the southern end of Ellesmere called Grise Fiord, whose Inuit name means «the place that never thaws out,» the Inuit have watched the sea ice that supports their traditional seal, polar bear and whale hunting decrease every year.

«Billions of juvenile fish under the Arctic sea ice: New under - ice net used in large - scale study on the prevalence of polar cod at the ice underside.»

The negative impacts of warmer winters may be less evident in Nordic countries than in places like Alaska, where people and animals like polar bears and seals are more dependent on the presence of sea ice, according to Serreze.

«When the sea ice melts, juvenile polar cod may go hungry: Biologists confirm how heavily the fish depend on ice algae.»

«When we look forward several decades, climate models predict such profound loss of Arctic sea ice that there's little doubt this will negatively affect polar bears throughout much of their range, because of their critical dependence on sea ice,» said Kristin Laidre, a researcher at the University of Washington's Polar Science Center in Seattle and co-author of a study on projections of the global polar bear population.

The U.S. Department of the Interior Wednesday listed the polar bear as a threatened species under the Endangered Species Act (ESA) of 1973 based on evidence that the animal's sea ice habitat is shrinking and is likely to continue to do so over the next several decades.

«With most [species], we can identify a localized threat, but the threat to the polar bear comes from global influences on sea ice.»

In some parts of the Arctic, sea ice loss is causing polar bears to spend longer periods on shore each summer.

«On short time scales, we can have variable responses to the loss of sea ice among subpopulations of polar bears,» Laidre said.

The decision was based on evidence that sea ice is vital for polar bear survival, that this sea ice habitat has been reduced, and that this process is likely to continue; if something is not done to change this situation, the polar bear will be extinct within 45 years, Kempthorne said.

«For example, in some parts of the Arctic, such as the Chukchi Sea, polar bears appear healthy, fat and reproducing well — this may be because this area is very ecologically productive, so you can lose some ice before seeing negative effects on bears.

U.S. District Court Judge Claudia Wilken in Oakland, Calif., on April 29 ordered the Bush administration to stop dragging its feet on the fate of polar bears and decide by May 15 whether declining sea ice in the Arctic threatens their existence.

IT WILL be little consolation to hungry polar bears in northern Manitoba, Canada, who have had to wait weeks longer than usual for sea ice to form on Hudson Bay, but their habitat is not irreversibly doomed.

The researchers found that between 1985 and 1994, 62 % of polar bear dens were built on sea ice — but that number dropped to 37 % between 1998 and 2004.

Starting next week, NASA's Operation IceBridge, an airborne survey of polar ice, will be carrying science flights over sea ice in the Arctic, to help validate satellite readings and provide insight into the impact of the summer melt season on land and sea ice.

In the San Francisco Bay area, sea level rise alone could inundate an area of between 50 and 410 square kilometres by 2100, depending both on how much action is taken to limit further global warming and how fast the polar ice sheets melt.

Discussions about the consequences of the vanishing ice usually focus either on the opening up of new frontiers for shipping and mineral exploitation, or on the plight of polar bears, which rely on sea ice for...

«When we think of climate change having an impact on a mammal species, what comes to mind most immediately is an Arctic animal like the polar bear, which depends on sea ice to survive,» Helgen said.

Many of the projected effects of climate change on the world's oceans are already visible, such as melting polar ice caps and rising sea levels.

Global warming has caused big problems for polar bears, which depend on sea ice for access to the ocean so they can hunt seals and other prey.

As sea ice disappears, polar bears are being forced to hunt more on land, which brings them into conflict with humans and increases contact with brown bears.

As a result of atmospheric patterns that both warmed the air and reduced cloud cover as well as increased residual heat in newly exposed ocean waters, such melting helped open the fabled Northwest Passage for the first time [see photo] this summer and presaged tough times for polar bears and other Arctic animals that rely on sea ice to survive, according to the U.S. Geological Survey.

Some species win, others don't Meanwhile, the loss of sea ice is making life harder for some marine animals, including polar bears and walruses, that rely on sea ice to hunt, breed and rear their young.

The researchers reached that conclusion by capturing more than two dozen polar bears, implanting temperature loggers and tracking their subsequent movements on shore and on ice in the Arctic Ocean's Beaufort Sea, north of Alaska and Canada, during 2008 - 2010.

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.

ESA's original mission to measure changes in ice sheets and sea ice in Earth's polar regions failed on October 8, 2005, when a software problem caused the commercial launch rocket to fail.

Because Kaktovik's polar bears seem especially susceptible to the Arctic's shrinking sea ice, researchers are concerned they may start relying more heavily on nutrient - poor food from land.

Before the melt, when they were hunting on stable sea ice, the polar bears had a big advantage over their favoured prey.

Reductions in sea ice in the Arctic have a clear impact on animals such as polar bears that rely on frozen surfaces for feeding, mating and migrating.

«This paper ties it all together and shows a very clear relationship between the disappearance of sea ice and increasing predation intensity on seabirds,» says Andrew Derocher, a polar bear specialist and Arctic ecologist at the University of Alberta in Edmonton, Canada.

Scientists are testing out a drone that could better map sea ice on a daily basis, and follow polar bear movements

On its own, sea level rise could inundate between 50 and 410 square kilometres of this area by 2100, depending on how much is done to limit further global warming and how fast the polar ice sheets melOn its own, sea level rise could inundate between 50 and 410 square kilometres of this area by 2100, depending on how much is done to limit further global warming and how fast the polar ice sheets melon how much is done to limit further global warming and how fast the polar ice sheets melt.

Bacteria, however, have remained Earth's most successful form of life — found miles deep below as well as within and on surface rock, within and beneath the oceans and polar ice, floating in the air, and within as well as on Homo sapiens sapiens; and some Arctic thermophiles apparently even have life - cycle hibernation periods of up to a 100 million years while waiting for warmer conditions underneath increasing layers of sea sediments (Lewis Dartnell, New Scientist, September 20, 2010; and Hubert et al, 2010).

Impact of ice melt on storms Freshwater injection onto the North Atlantic and Southern Oceans causes increase of sea level pressure at middle latitudes and decrease at polar latitudes.

a) Satellite image showing fast disintegration of sea ice over a polar continental shelf; b) Zoobenthos on an Antarctic continental shelf; c) Examples of sea mosses (specimens on the left are from an open - water location and hence have had more plankton to feed on); and d) Dead bryozoan and other benthic skeletons covering the seabed, most likely to be buried, sequestering their blue carbon in the seabed.

* Here, focusing on Arctic sea ice and polar bears, we show that blogs that deny or downplay AGW disregard the overwhelming scientific evidence of Arctic sea - ice loss and polar bear vulnerability.

Current studies include the exploration of Arctic deep - sea life under the ice, and the long - term observation of the effects of global warming on polar ecosystems as well as on hypoxic aquatic ecosystems.

Because they depend on sea ice to hunt seals, the polar bear is considered threatened as global warming melts and thins ice in this region.

Locally, declining sea ice is affecting the feeding and migration patterns of polar bears, whales, walrus and seals, and the people who live in the Arctic and rely on seasonal ice for their livelihoods.

Reading Robert Pondiscio's recent article («The Left's drive to push conservatives out of education reform») calls to mind Al Gore's «An Inconvenient Truth» and its powerful image of a polar bear drifting helplessly on a shrinking sheet of ice in a warming sea.

On the other hand, during those periods between widespread glaciation, the water had melted from the ice sheets and polar areas, flowed, back into the oceans and sea level was as high or higher than now.

Today, if just the current Ross Ice Shelf of Antarctica melted, it is estimated that sea level would rise 20 to 251 If we melted all of the ice on Greenland, the North polar areas and the Antarctic in addition, sea level could rise 300» or Ice Shelf of Antarctica melted, it is estimated that sea level would rise 20 to 251 If we melted all of the ice on Greenland, the North polar areas and the Antarctic in addition, sea level could rise 300» or ice on Greenland, the North polar areas and the Antarctic in addition, sea level could rise 300» or so.

★ Mika Rottenberg: «Bowls Balls Souls Holes» (through June 14) The centerpiece of this show, a delirious, 28 - minute video called «Bowls Balls Souls Holes,» takes viewers on a mind - blowing trip through time and space, from a Harlem bingo parlor to melting ice in a polar sea and from a seedy urban hotel to the subterranean depths of a parallel universe.

At a time when melting polar sea ice is causing so many to focus on which political power will place its flag over the Arctic, controlling the Northwest Passage shipping lanes and the petroleum resources beneath the sea ice, Miami artist Xavier Cortada has developed a project that engages people across the world below to plant a green flag and native tree to help address global climate change.

Her work showed that polar bears, while best known for their life at sea or on sea ice pursuing seals, have been able, at least in some circumstances, to gain significant nutrition on land as well, scarfing down geese and goose eggs, grasses and other fare when sea ice is in retreat.

Polar amplication is of global concern due to the potential effects of future warming on ice sheet stability and, therefore, global sea level (see Sections 5.6.1, 5.8.1 and Chapter 13) and carbon cycle feedbacks such as those linked with permafrost melting (see Chapter 6)... The magnitude of polar amplification depends on the relative strength and duration of different climate feedbacks, which determine the transient and equilibrium response to external forcings.