Sentences with phrase «northern polar regions»

During most of the Silurian Period, the vast Panthalassic Ocean covered the northern polar regions, the supercontinent of Gondwana stretched over the southern polar region, and a ring of at least six continents spanned the Equator and middle latitudes.

Other evidencde suggests there may have been a localised warming occuring in the Arctic during the 20's and 30's at exactly the same time that measurement coverage in the northern polar regions was in flux - not an ideal situation.

In the northern polar regions, where water and land are interspersed, the polar easterlies give way in summer to variable winds.

As northern polar regions continue to warm at a rate twice the global average, this permafrost begins to thaw.

«There is little doubt that polar bears are very susceptible as global climate change continues to drastically alter the landscape of the northern polar regions,» said Robert Rockwell, a research associate in the Museum's Department of Ornithology.

The observed warming is is greatest in the northern polar regions, as predicted.

As northern polar regions warm, the temperature contrast between them and temperate zones — such as the continental United States — diminishes.

During the main Cassini mission in 2004 — 2008, which occurred in the southern hemisphere's summer, more clouds and lakes were observed in the northern polar regions, where it was winter.

With the gravity - mapping mission now over, if all goes according to schedule, the probes» Thelma - and - Louise moment will occur at approximately 5:28 p.m. EST on Monday, 17 December, when the craft slam into a 2 - kilometer - tall mountain in the northern polar regions of the moon, NASA announced in a press conference today.

Pictures of the Northern polar regions revealed watery stormclouds that mark the arrival of fall.

Following an expected soft landing in the northern polar region, Phoenix will study the planet's ice cap and use a robotic arm to dig into the Martian subsurface, collecting ice and soil samples.

The northern polar region's climate has materially changed over the past five years, a team of 121 scientists from 14 nations concludes in a December 1 Arctic report card.

It sits in Ligeia Mare, a sea made of methane, ethane and nitrogen in Titan's northern polar region.

Astronomers are puzzled by the scalloped band of low - lying clouds (left of the planet's center) and the small storms (bright blotches at right) dotting the northern polar region.

Since the 1970s the northern polar region has warmed faster than global averages by a factor or two or more, in a process of «Arctic amplification» which is linked to a drastic reduction in sea ice.

Temperatures in the northern polar region have already risen by 1.6 degrees Celsius (2.88 degrees Fahrenheit) since the dawn of the Industrial Revolution.

The reason that scientists are looking for life in this area is that it is thought to be the place on Earth that most closely resembles the permafrost found in the northern polar region of Mars at the Phoenix landing site.

Charon's color pattern is simpler, dominated by neutral low latitudes and a reddish northern polar region.

Thirty years later — the equivalent of one Saturn year, in other words, the time the planet takes to go all the way around the Sun — and over more than six consecutive years, researchers in the UPV / EHU's Planetary Sciences Group, in collaboration with astronomers from various countries, were able to observe Saturn's northern polar region in detail once again and confirmed that the hexagon continued in place.

Current observations suggest that Titan has lakes mainly in the northern polar region and has tropospheric clouds mainly in the southern middle latitudes and polar region.

The plains of the northern polar region of Mars is shown.

That maneuver, NASA told USA Today will be the probe's «final opportunity for up - close observations of the lakes and seas of liquid hydrocarbons that spread across the moon's northern polar region, and the last chance to use its powerful radar to pierce the haze and make detailed images of the surface.»

He was also the Principal Investigator for NASA's Phoenix spacecraft, which successfully landed on Mars» northern polar region in 2008.

When the new set of images is compared to Hubble pictures taken in 1994, the northern polar region of Pluto seems to have grown brighter, while the southern hemisphere has become darker.

Michael, think about what would happen as small variations in earth's orbit changed such that the northern polar region received increasingly less sunlight each summer, preventing all of the previous year's snowfall from melting.

The range of ocean remaining frozen over the northern polar region reached its minimum extent for 2009 on September 12, when it covered 1.97 million square miles (5.1 million square km), and now appears to be growing again as the Arctic starts its annual cool - down, the National Snow and Ice Data Center reported.

Despite this natural variability - related switch pulling global temperatures down, NASA shows a globe in which few regions experienced below - average temperatures and where the highest concentration of record - warm temperatures are centered near the northern polar region.

It is true that this is consistent with the idea that there has been continuous global warming, although it is complicated by the fact that the Antarctic sea ice extent still seems to be about the same, i.e., the «global» warming only seems to have affected the northern polar region, not the southern polar region.

While the results do not show a significant impact on human health, especially considering that most of the ozone loss documented in this study occurs over the northern polar region, they are important scientifically.

From ice core data we can see that on approximately 1,500 - year cycles, the northern polar region has warmed while the southern polar region has cooled.

Temperatures in the northern polar region have already risen by 1.6 degrees Celsius (2.88 degrees Fahrenheit) since the dawn of the Industrial Revolution.

Given that the northern polar region is dominated by water, whereas the southern polar region is dominated by land, one would expect a greater temperature response to changes in ice extent in the Arctic than Antarctica.

Previous studies of satellite and submarine observations have seemed to establish a warming trend in the northern polar region and raise the possibility of a melting icecap.

Not exact matches

On Earth, the brightest auroras (the high - altitude glows often called the northern and southern lights) are generated when electrons in outer space near Earth are accelerated by large electrical potentials, or voltages, along the lines in our planet's magnetic field and slam into gas molecules in the upper atmosphere above polar regions.

Extratropical storms partly depend on the temperature gradient, which is predicted to weaken in the northern hemisphere as the polar region warms more than the rest of the hemisphere.

The polar regions provide a window into space where high - energy solar particles arriving in the Earth's atmosphere can cause spectacular effects, such as the northern lights or aurora borealis.

This study is the latest in a growing body of research that suggests dwindling sea ice and snow cover in the polar regions may be altering the weather over the continents of the Northern Hemisphere.

The video begins in the polar region of Northern Canada, moving through the cool temperate climate of the Alps, the warm temperate climate of Australia's Fraser Island and the tropical rain forest in Central Uganda, to end in the dry heat of the Sinai desert.

Measure of the pressure gradient between the polar and subpolar regions of the Northern Hemisphere.

It is not that the polar regions are amplifying the warming «going on» at lower latitudes, it is that any warming going on AT THE POLES is amplified through inherent positive feedback processes AT THE POLES, and specifically this is primarily the ice - albedo positive feedback process whereby more open water leads to more warming leads to more open water, etc. *** «Climate model simulations have shown that ice albedo feedbacks associated with variations in snow and sea - ice coverage are a key factor in positive feedback mechanisms which amplify climate change at high northern latitudes...»

To leave out the polar regions, and specifically the northern hemisphere, which, both by observation and by measurement has seen a larger percentage warming than the mid-latitudes is to slice the greatest area of dynamic change related to global warming right out of the equation.

Some are from the polar regions, some from the tropics, some from the northern hemisphere, some from the southern, some from ocean sites, and some from inland sites.

The data is being reported by the University of Illinois's Arctic Climate Research Center, and is derived from satellite observations of the Northern and Southern hemisphere polar regions (Daily Tech).

This climate change induced blocking pattern has also been associated with numerous warm air invasions of the Northern Hemisphere polar region, the most recent of which occurred yesterday.

And it is known that the southern polar regions «see - saws» with the northern — so when the north polar is on the up cycle — the south polar in on a downer (Bob Tisdale's graph of the southern ocean SSTs shows this clearly for the «global warming» period of 1980 - 2005 — and the Peninsula Region just catches a flow - in from warmer seas to the north).

As for the facts concerning temperature development in the high northern hemisphere, the over-proportional rise in the wider polar region is well established and undisputed.

Anomalies are shown in a globally complete Robinson projection, and in polar stereographic projections for the northern and southern hemispheres that do not encompass the regions of the deep tropics where precipitation anomalies are most uncertain.

Polar bears are one of the most sensitive Arctic marine mammals to climate warming because they spend most of their lives on sea ice.35 Declining sea ice in northern Alaska is associated with smaller bears, probably because of less successful hunting of seals, which are themselves ice - dependent and so are projected to decline with diminishing ice and snow cover.36, 37,38,39 Although bears can give birth to cubs on sea ice, increasing numbers of female bears now come ashore in Alaska in the summer and fall40 and den on land.41 In Hudson Bay, Canada, the most studied population in the Arctic, sea ice is now absent for three weeks longer than just a few decades ago, resulting in less body fat, reduced survival of both the youngest and oldest bears, 42 and a population now estimated to be in decline43 and projected to be in jeopardy.44 Similar polar bear population declines are projected for the Beaufort Sea region.45

Sea level pressure in the polar and sub polar regions are measured in the Southern and Northern Annular Modes — the changes in sea level pressure creates the potential for the anomalous movement of atmospheric mass into lower latitudes.

For example, reductions in seasonal sea ice cover and higher surface temperatures may open up new habitat in polar regions for some important fish species, such as cod, herring, and pollock.128 However, continued presence of cold bottom - water temperatures on the Alaskan continental shelf could limit northward migration into the northern Bering Sea and Chukchi Sea off northwestern Alaska.129, 130 In addition, warming may cause reductions in the abundance of some species, such as pollock, in their current ranges in the Bering Sea131and reduce the health of juvenile sockeye salmon, potentially resulting in decreased overwinter survival.132 If ocean warming continues, it is unlikely that current fishing pressure on pollock can be sustained.133 Higher temperatures are also likely to increase the frequency of early Chinook salmon migrations, making management of the fishery by multiple user groups more challenging.134