Sentences with phrase «northern polar»

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.

However, studies have shown that there is substantial transport of air pollution to northern polar latitudes from North America and, more importantly, Eurasia.

The northern polar ice - cap has oscillated in size over the last 2 million years (the glacial - interglacial cycles of the Pleistocene Epoch).

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.

Ut oh, northern polar sea ice melts have slowed considerably.

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.

The downward path coming from eddy diffusion and the downward flow to the northern polar vortex at the tale end of planetary and gravity waves.

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.

Baldwin et al who are considered the experts in the QBO (stratospheric wind oscillation) speculate on the role of UV in the mesosphere and how modulation could play an important role in the break up of the northern polar vortex.

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.

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.

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.

There are indications that large regions of the permafrost in parts of Alaska and other northern polar areas are already thawing, with the potential to release massive amounts of carbon into the atmosphere beyond those being directly added by human activity.

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

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.

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.

More precisely, the maximum of solar cycle 24 was characterised by a rather slow and intermittent reversal of the polar field, with north - south asymmetry, meaning that the Northern polar field reversed on November 2012 and the Southern on March 2014, with both polar fields being simultaneously positive for more than a year (Sun et al. 2015).

According to Green and his colleagues, these would include an average increase of about 4 °C (~ 7 °F), which would be enough to melt the carbon dioxide ice in the northern polar ice cap.

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

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.

«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 NAM has links with the northern polar vortex and hence the stratosphere.

Their latest modelling studies indicate northern polar waters could be ice - free in summers within just 5 - 6 years.

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

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.

But I remember seeing the Aurora Borealis — the northern polar lights — from one end to the other out of my sleeping bag: That was amazing.

1988 prediction by Syukuro Manabe, NASA atmospheric physicist of what we now observe: Human caused warming will proceed most rapidly in the northern polar reaches.

It is only a matter of time before the thermal momentum of the latter part of the 20th century is reversed, and the northern polar cap begins to cool back down, reforming the ice.

To understand the causes of glacial cycles, I looked at relevant data (northern polar circle summer insolation) and used the computer code by Laskar et al 1993 to compute future insolations.

Global warming caused the melting of the northern polar ice cap, and tropical storms ravage all areas that didn't suffer from desertification.

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

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.

As a case in point, consider the discovery by NASA's Phoenix lander of carbonates in the planet's northern polar plains.

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.

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

The latest image from the Mars Express orbiter, just released by the European Space Agency, was taken on the 19th June, 2017 and shows a rare upside - down, wide - angle view of Mars with its icy northern polar cap at the bottom.

However, most of the surface features unveiled by Hubble, including the prominent northern polar cap, are likely produced by the complex distribution of frosts that migrate across Pluto's surface with its orbital and seasonal cycles and chemical byproducts deposited out of Pluto's nitrogen - methane atmosphere.

«The observation that Mars» northern polar cap barely deforms [from season to season] implies that its planetary interior is colder than expected.»

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.»

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

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.

A dark red northern polar cap on Pluto's largest moon Charon may be caused by trapped gas, according to research published in Nature this week.

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.

It yielded fundamental insights into the physics of northern polar clouds, and AWARE scientists hope that their project will do the same for the south.

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

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.

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.

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.

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.

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.