Sentences with phrase «polar air warms»

The IPCC claim this will decrease with global warming as the polar air warms more than the tropical air.

Not exact matches

The researchers identified several key circulation patterns that affected the winter temperatures from 1979 to 2013, particularly the Arctic Oscillation (a climate pattern that circulates around the Arctic Ocean and tends to confine colder air to the polar latitudes) and a second pattern they call Warm Arctic and Cold Eurasia (WACE), which they found correlates to sea ice loss as well as to particularly strong winters.

Mori et al. identified two circulation patterns that drove winter temperatures in Eurasia from 1979 to 2013: the Arctic Oscillation (which confines colder air to the polar latitudes) and a pattern dubbed «Warm Arctic and Cold Eurasia» (WACE), which correlated both to sea - ice loss in the Barents - Kara Sea and to particularly cold winters; its impact has more than doubled the probability of severe winters in central Eurasia.

The more intensive variations during glacial periods are due to the greater difference in temperature between the ice - covered polar regions and the Tropics, which produced a more dynamic exchange of warm and cold air masses.

It's called the polar jet stream, and as it writhes eastward across the North American continent, it can bring storms in its wake or herald an unseasonable change in temperature — north of the jet stream lies cold, Arctic air, while to its south are warmer conditions.

This time of year, the stratosphere tends to warm up with the breakdown of the polar vortex, a cyclone that traps cold air.

The two main forces that conspire to destroy Earth's massive polar ice sheets are heat, which melts their surfaces via sunlight and warm air, and gravity, which drives glaciers to slide to the sea.

Warm air and surface water are melting the summer polar ice cap.

And when you get a polar vortex disruption, warm air from the lower latitudes rushes in to the Arctic, and you can get extreme warm events like we saw in February.

A low - altitude flow of warm, moist air from an ocean area combined with a flow of cold, dry polar air high up creates maximum instability, which means that parcels of air heated near the surface rise rapidly, creating powerful updrafts.

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.

The ocean around Antarctica is warmer than both the continent's icy surface and the polar air.

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).

When polar air dipping southward collides with rising warm tropical air, the meet - up causes a powerful atmospheric wave with rollercoaster - like patterns that propagate eastward around the globe.

Changes in climate can cause the polar jet stream — the boundary between the cold North Pole air and the warm equatorial air — to migrate south, bringing with it cold, Arctic air.

When snowfall is high in Siberia, the resultant cold air enhances atmospheric disturbances, which propagate into the upper level of the atmosphere, or stratosphere, warming the polar vortex.

To me it is evidence of warm air displacing cold air in the polar regions.

The was a large so - called blocking high in North Atlantic that led to the polar outbreaks into Europe and so that is where the cold air went, making it warmer in behind.

Excerpt: Livermore CA (SPX) Nov 01, 2005 If humans continue to use fossil fuels in a business as usual manner for the next several centuries, the polar ice caps will be depleted, ocean sea levels will rise by seven meters and median air temperatures will soar 14.5 degrees warmer than current day.

The warm air above nocturnal or polar inversions, or even stable air masses with small positive lapse rates, are warmer than otherwise because of heat capacity and radiant + convective heating during daytime and / or because of heating occurring at other latitudes / regions that is transported to higher latitudes / regions.

Environmental groups have sought to force the federal government to restrict carbon dioxide emissions using the Clean Air Act, the Endangered Species Act (because of threats to polar bears from global warming) and other federal laws, and now they are poised to add the Clean Water Act to the list.

With the source regions warming, the polar and artic air masses would modify (warm), and the mechanism that transports them equatorward (the polar jet) would weaken.

The reason they occur in the middle latitudes is because they occur at the boundary between cold polar air and warmer tropical air.

In our latitudes a front usually separates warm, moist air from the tropics and cold, relatively dry air from polar regions.

One hypothesis suggests that the shrinking temperature difference between the Arctic and the mid-latitudes will lead to a slowing of the jet stream, which circles the northern latitudes and normally keeps frigid polar air sharply separated from warmer air in the south.

Most interesting is that the about monthly variations correlate with the lunar phases (peak on full moon) The Helsinki Background measurements 1935 The first background measurements in history; sampling data in vertical profile every 50 - 100m up to 1,5 km; 364 ppm underthe clouds and above Haldane measurements at the Scottish coast 370 ppmCO2 in winds from the sea; 355 ppm in air from the land Wattenberg measurements in the southern Atlantic ocean 1925-1927 310 sampling stations along the latitudes of the southern Atlantic oceans and parts of the northern; measuring all oceanographic data and CO2 in air over the sea; high ocean outgassing crossing the warm water currents north (> ~ 360 ppm) Buchs measurements in the northern Atlantic ocean 1932 - 1936 sampling CO2 over sea surface in northern Atlantic Ocean up to the polar circle (Greenland, Iceland, Spitsbergen, Barents Sea); measuring also high CO2 near Spitsbergen (Spitsbergen current, North Cape current) 364 ppm and CO2 over sea crossing the Atlantic from Kopenhagen to Newyork and back (Brements on a swedish island Lundegards CO2 sampling on swedish island (Kattegatt) in summer from 1920 - 1926; rising CO2 concentration (+7 ppm) in the 20s; ~ 328 ppm yearly average

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.

By Sreeja VN: Sizzling underwater glacial ice, as it melts into warmer sea water, creates one of the loudest natural marine environments, and the air bubbles that pop during the process could help scientists measure the rate of glacier melt and track fast - changing polar environments.

-LRB-- NAO) This sea ice then melts in the Sub Polar Atlantic, releasing fresh water into the sub - polar Atlantic waters, which in turn impedes the formation of NADW, which slows down the thermohaline circulation causing warm air not to be brought up from the lower latitudes as far north as previous while in lessening amounts.

Long story short, the polar vortex is the result of global warming changing the semi-permanent weather system over the arctic regions resulting in movement of cold air masses from the arctic region to parts of North America, such as Canada and, unfortunately, poor Buffalo.

In these events, cold - air usually penned in the Arctic by winds known as the polar vortex, broke out and reached the U.S. and Europe due to an erosion of the vortex, an erosion that may have been driven by an abnormally warm Arctic.6

At this location, frontal lifting associated with mid-latitude cyclones moves warm subtropical air over cold polar air producing clouds and precipitation.

If polar vortices are driven further and further south, drawing up warmer air from middle latitudes toward the pole and supplanting them with Arctic chill, then many nations might experience cooling, while the generally unmonitored Arctic Circle region experiences substantial restructuring of sea ice as well as surface warming and deep ocean warming too.

You will see polar cyclones with warm cores at the 250 hPa level if you set the display to show air temperature.

In order to ascertain whether there is a global warming or cooling trend it is necessary to wait several years and then compare the volume and intensity of the cold polar air masses as a whole between the dates chosen.

As (relatively) warmer tropical air slowly circulated (colder poles), first Earth's polar oceans would freeze, then the mid-latitudes, then even the equatorial oceans.

Since cold air is more dense, atmospheric pressure decreases more rapidly with height on the poleward side of the polar front than on the warmer tropical side.

The same can be observed around some Andean glaciers and of course the Antarctic peninsula: renewed advection of warmer air displaced by colder HP polar air masses descending to lower latitudes can melt certain regions yet it does not mean global warming, quite the opposite in fact.

Extratropical cyclones have three stages of expansion: the developing stage, in which an undulating wave develops along the front; the mature stage, in which sinking cold air sweeps equatorward west of the surface low - pressure centre and ascending warm air moves poleward east of the cyclone; and the occluded stage, in which the warm air is entrained within and moved above the polar air and becomes separated from the source region of the tropical air.

In contrast, warm fronts are well defined at the equatorward surface position of polar air as it retreats on the eastern sides of extratropical cyclones.

In the troposphere, the demarcation between polar air and warmer tropical atmosphere is usually defined by the polar front.

That warm air in the Arctic came from outside the polar zone and persists despite the lack of light.

Clouds and often precipitation occur on the poleward sides of both warm and stationary fronts and whenever tropical air reaching the latitude of the polar front is forced upward over the colder air near the surface.

The heat arrives from the Atlantic Ocean that moves warm water along northern Norway and western Spitsbergen where the ocean is ice - free despite freezing air temperatures even during the months of total darkness during the polar night.

The negative phase is different, and quite rare: high pressure over the Arctic forces the cold air to spill out over North America and Eurasia, allowing warm air to rush in to the polar region.

The boundary between the cold polar air and the warm tropical air is called the Polar Front.

The warm air intrusion followed two other related and noteworthy weather events, a sudden warming of the stratosphere, known as a sudden stratospheric warming event, and a splitting of the polar vortex.

So, the original theory of AGW would have produced warmer air coming from the polar regions which would have created a smaller temperature difference between systems, and thus would have created fewer extreme weather events, not more of them.

Since to me (and many scientists, although some wanted a lot more corroborative evidence, which they've also gotten) it makes absolutely no sense to presume that the earth would just go about its merry way and keep the climate nice and relatively stable for us (though this rare actual climate scientist pseudo skeptic seems to think it would, based upon some non scientific belief — see second half of this piece), when the earth changes climate easily as it is, climate is ultimately an expression of energy, it is stabilized (right now) by the oceans and ice sheets, and increasing the number of long term thermal radiation / heat energy absorbing and re radiating molecules to levels not seen on earth in several million years would add an enormous influx of energy to the lower atmosphere earth system, which would mildly warm the air and increasingly transfer energy to the earth over time, which in turn would start to alter those stabilizing systems (and which, with increasing ocean energy retention and accelerating polar ice sheet melting at both ends of the globe, is exactly what we've been seeing) and start to reinforce the same process until a new stases would be reached well after the atmospheric levels of ghg has stabilized.

It guides the movement of mid latitude depressions and effectively marks an interface between warmer equatorial air and colder polar air.