Sentences with phrase «of changes in the jet stream»

Further adding to the divide within the climate science community is the fact that many of the climate models that Trenberth and others often use do not show the sorts of changes in the jet stream that the new study and others like it have pointed to, including the more frequently stagnated or «blocked» weather patterns that Francis cited.

Not exact matches

The study by the Planetary Sciences Group reports that this gigantic storm is another of the agents of change in the equatorial jet stream.

They compared those events with changes in the Global Wind Oscillation (GWO) index, a collection of climate and weather information that measures atmospheric angular momentum, or the degree of waviness in the jet stream.

The strength and path of the North Atlantic jet stream and the Greenland blocking phenomena appear to be influenced by increasing temperatures in the Arctic which have averaged at least twice the global warming rate over the past two decades, suggesting that those marked changes may be a key factor affecting extreme weather conditions over the UK, although an Arctic connection may not occur each year.

The research is the first reconstruction of historical changes in the North Atlantic jet stream prior to the 20th century.

«The jet stream changes character every 10 to 12 days, and we use this pattern to predict the weather,» said Anthony Lupo, professor of atmospheric science in MU's School of Natural Resources, which is located in the College of Agriculture, Food and Natural Resources.

«Weather should remain predictable despite climate change: Simulations of jet stream behavior in a warming climate suggest ranges of forecasts in the mid-century will be similar to those in present day.»

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.

But Robeson said the observation aligns with theories about climate change, which hold that amplified warming in the Arctic region produces changes in the jet stream, which can result in extended periods of cold weather at some locations in the mid-northern latitudes.

Widening of the tropics would also probably be associated with poleward movement of major extratropical climate zones due to changes in the position of jet streams, storm tracks, mean position of high and low pressure systems, and associated precipitation regimes.

The ongoing disappearance of sea ice in the Arctic from elevated temperatures is a factor to changes in atmospheric pressure that control jet streams of air, explained James Overland, an oceanographer of the National Oceanic and Atmospheric Administration, or NOAA.

Dr Screen said: «The results of the computer model suggest that melting Arctic sea ice causes a change in the position of the jet stream and this could help to explain the recent wet summers we have seen.

Importantly, the NAO relates to changes in the strength and position of the North Atlantic jet stream - a band of very fast winds high in the atmosphere.

Those changes may include the loss of Arctic summer sea ice, the collapse of ice sheets in Greenland and western Antarctica, dieback of the Amazon rainforest and changes in the jet stream and the pattern of El Niño and La Niña weather cycles.

There are other influences on the jet stream's behavior, and some scientists think that changes in tropical ocean temperatures, or the cyclical recurrence of El Niño, might have a bigger effect on the jet stream than changes in the Arctic.

Research into three centuries of European tree ring data by Valerie Trouet of the University of Arizona found evidence of significant changes in the jet stream starting in the 1960s.

Scientists want to understand how changing the dynamics of the jet stream in models can change how the model predicts the timing and location of these extreme phenomena.

And those changes in the Hadley Circulation can affect the subtropical jet stream — an area of fast - moving air that guides storms — in both the Northern and Southern hemispheres.

In Liquidity inc., Steyerl makes one of her characteristic intellectual leaps and connects extreme financial events to extreme climate events: the jet stream of money changes direction when the Dow Jones collapses, then suddenly a gonzo weather forecaster, masked in black, is gesturing across the most political of politically geographical maps you ever saw — noting failed states and off - shore tax havens, isobars indicating flows of capital rather than weather frontIn Liquidity inc., Steyerl makes one of her characteristic intellectual leaps and connects extreme financial events to extreme climate events: the jet stream of money changes direction when the Dow Jones collapses, then suddenly a gonzo weather forecaster, masked in black, is gesturing across the most political of politically geographical maps you ever saw — noting failed states and off - shore tax havens, isobars indicating flows of capital rather than weather frontin black, is gesturing across the most political of politically geographical maps you ever saw — noting failed states and off - shore tax havens, isobars indicating flows of capital rather than weather fronts.

The Paramagnetic Oxygen Transport Thesis explains the failure of Brewer - Dobson equatorial ozone formation, the Ozone Hole in 1983, continued Antarctic cold temps concurrent with Arctic warming, mid-latitude ozone formation which accelerates jet streams and elongates Rossby wave loops, and wandering magnetic poles which control extreme weather and climate change.

One minute change in the atmospheric regime can slowly effect further changes in the system and the chain reaction can occur, which, in the end, could shift a jet stream a few kilometres and create conditions possible for storm intensification, which may result in the flooding of an area where the storm would not have been or would have been greatly minimised.

Or it may be caused by any other mechanism (like the influence of solar changes on the jet stream position) which enhance the simple direct insolation change which is incorporated in several current climate models...

The second aspect of climate change that is likely affecting Alaska more and more is the apparent tendency of warming in the Arctic and warmer sea surface temperatures in the Pacific to contribute to larger waves in the jet stream.

The jet stream off the East Coast of the United States controls an important climate pattern in the Atlantic... «The North Atlantic Oscillation is really driving these changes in ocean circulation,» said Gerald McCarthy, lead study author and an oceanographer at the University of Southampton in the United Kingdom....

The latest en vogue explanation linking human greenhouse gas emissions to strong winter - season East Coast storms involves changes in the characteristics of the jet stream — a river of fast moving air in the atmosphere that influences both the strength and the forward speed of extratropical storm systems.

One was published several months ago in Geophysical Research Letters by James Screen and Ian Simmonds, who looked for changes in jet stream characteristics using a different methodology than that of Francis and Vavrus.

A prominent (in the media, anyway) research study last year by Rutgers's Jennifer Francis and University of Wisconsin's Stephen Vavrus suggests that the declining temperature difference between the Arctic and the lower latitudes (adding greenhouse gases into the atmosphere warms colder, drier regions more so than warmer, wetter ones — with the notable exception of Antarctica) has led to changes in the jet stream which result in slower moving, and potentially stronger East Coast winter storm systems.

«If loss of sea ice is driving changes in the jet stream, the jet stream is changing Greenland, and this, in turn, has an impact on the Arctic system as well as the climate.

I think there is evidence that AGW has caused the decline in arctic sea ice, which may be responsible for the changes seen in the paths of the jet stream, which may be responsible for the blocking high over Greenland which was responsible for Sandy's left turn.

Although the theory is still being explored, teleconnections are thought to link land use to changes in the polar jet stream, the paths of tropical cyclones, and the frequencies and intensities of droughts, floods, heat waves, and other weather events.

According to climate scientist Michael Mann, it's very possible that several of the recent severe and costly extreme weather outbreaks are linked to changes in the jet stream he identified in a recent study.

You say that there is evidence that AGW has caused the decline in arctic sea ice, which may be responsible for the changes seen in the paths of the jet stream, which may be responsible for the blocking high over Greenland which was responsible for Sandy's left turn.

And science is emerging suggesting a link between the melting of Arctic sea ice on one hand and faster warming in the region and changes to the northern hemisphere jet stream on the other, explaining why some weather systems appear to get «stuck in place» — to often - devastating effect.

Francis, who wasn't involved with either study, is one of the main proponents of an idea that by altering how much heat the ocean lets out, sea ice melt and Arctic warming can also change atmospheric circulation patterns, in particular by making the jet stream form larger peaks, or highs, and troughs, or lows.

There have been many primarily anthropogenic changes in the past, but the major jet stream changes caused by the retreat of the North American Ice Shield seems to be much more determinative for Holocene changes in Saharan rainfall.

So jet stream positioning and consequent changes in solar input to the oceans could swing the ENSO phenomenon in favour of dominant El Nino or dominant La Nina subject additionally to possible modulation from internal oceanic effects.

The reason for the change in the shape and positions of atmospheric jet streams is, for now, an issue of debate, with AA as one of the potential candidates (see, e.g., refs.

The advantage of recognising a reversed sign for the solar effect high up in the atmosphere is that it enables a scenario whereby the bottom up effects of ocean cycles and the top down effects of solar variability can be seen to be engaged in a complex ever changing dance with the primary climate response being changes in the tropospheric air circulation systems to give us the observed natural climate variability via cyclical latitudinal shifts in all the air circulation systems and notably the jet streams.

As I describe in that article the weather systems on Earth (primarily the jet streams and the high pressure cells either side of them) ramp up their thermal efficiency in tune with the scale of any positive or negative energy input changes from any source including that from human CO2.

Southern California has gotten quite bit of weather lately, thanks to the changes in the jet stream track in this El Niño year.

While the causes of the PDO are still unknown, the primary effects seem to be changes in northeast Pacific marine ecosystems and a changing jet stream path.

«Changes in the position of the jet stream are very noisy, and can be hard to detect even in climate simulations,» Amy Butler, an atmospheric scientist at NOAA, told BuzzFeed News.

The previous suggested reason was that climate change was shifting storms and the powerful air currents known as the jet streams — including the one that traverses the United States — toward the poles, which in turn were driving the movement of the clouds.

Indeed on the basis of my previous article about weather being the key it may be possible to get even earlier warning of changes in global temperature trend from observation of the preferred positions of the jet streams and the main high pressure systems.

-- The record melt of the Greenland ice sheet was facilitated by changes in the jet stream... — http://www.redorbit.com/news/science/1112875668/jet-stream-caused-greenland-ice-sheet-melt-2012-061713/ «According to University of Sheffield research, published in the International Journal of Climatology, unusual Jet Stream changes were behind record surface melt of the Greenland Ice Sheet last summer.&raqjet stream... — http://www.redorbit.com/news/science/1112875668/jet-stream-caused-greenland-ice-sheet-melt-2012-061713/ «According to University of Sheffield research, published in the International Journal of Climatology, unusual Jet Stream changes were behind record surface melt of the Greenland Ice Sheet last summer.&raqjet-stream-caused-greenland-ice-sheet-melt-2012-061713/ «According to University of Sheffield research, published in the International Journal of Climatology, unusual Jet Stream changes were behind record surface melt of the Greenland Ice Sheet last summer.&raqJet Stream changes were behind record surface melt of the Greenland Ice Sheet last summer.»

Researchers are already beginning to connect such changes in the jet stream to weather effects in mid-latitudes such as the unseasonable blasts of cold Arctic air known as the polar vortex.

This episode addressed Dr. Francis» hypothesis that climate change might causing a «drunken Arctic» and slowed down jet stream; a phenomenon which might result in the kind of extreme winter weather we've been having this year.

The primary cause of changes in the course of the northern hemisphere jet stream ultimately goes back to sea surface temperatures in the West Pacific.

It is all about changes in behavior of the jet stream.

Thus there is a back and forth in global cloudiness as the Sun's activity level changes over the decades and centuries — such as during the period covering the Medieval Warm Period, the Little Ice Age, and the current warm period — through latitudinal shifting of the jet stream tracks and permanent climate zones.