Earth:Jet stream

From HandWiki
Short description: Fast-flowing atmospheric air current

File:Aerial Superhighway.ogv

Clouds along a jet stream over Canada.
Part of the nature series
Weather
Calendar seasons
Tropical seasons
Storms
Precipitation
Topics
Glossaries

Jet streams are fast flowing, narrow, meandering air currents in the atmospheres of the Earth,[1] Venus, Jupiter, Saturn, Uranus, and Neptune.[2] On Earth, the main jet streams are located near the altitude of the tropopause and are westerly winds (flowing west to east). Jet streams may start, stop, split into two or more parts, combine into one stream, or flow in various directions including opposite to the direction of the remainder of the jet.

Overview

The strongest jet streams are the polar jets around the polar vortices, at 9–12 km (5.6–7.5 mi; 30,000–39,000 ft) above sea level, and the higher altitude and somewhat weaker subtropical jets at 10–16 km (6.2–9.9 mi; 33,000–52,000 ft). The Northern Hemisphere and the Southern Hemisphere each have a polar jet and a subtropical jet. The northern hemisphere polar jet flows over the middle to northern latitudes of North America, Europe, and Asia and their intervening oceans, while the southern hemisphere polar jet mostly circles Antarctica, both all year round.

Jet streams are the product of two factors: the atmospheric heating by solar radiation that produces the large-scale polar, Ferrel, and Hadley circulation cells, and the action of the Coriolis force acting on those moving masses. The Coriolis force is caused by the planet's rotation on its axis. On other planets, internal heat rather than solar heating drives their jet streams. The polar jet stream forms near the interface of the polar and Ferrel circulation cells; the subtropical jet forms near the boundary of the Ferrel and Hadley circulation cells.[3]

Other jet streams also exist. During the Northern Hemisphere summer, easterly jets can form in tropical regions, typically where dry air encounters more humid air at high altitudes. Low-level jets also are typical of various regions such as the central United States. There are also jet streams in the thermosphere.[4]

Meteorologists use the location of some of the jet streams as an aid in weather forecasting. The main commercial relevance of the jet streams is in air travel, as flight time can be dramatically affected by either flying with the flow or against. Often, airlines work to fly 'with' the jet stream to obtain significant fuel cost and time savings. Dynamic North Atlantic Tracks are one example of how airlines and air traffic control work together to accommodate the jet stream and winds aloft that results in the maximum benefit for airlines and other users. Clear-air turbulence, a potential hazard to aircraft passenger safety, is often found in a jet stream's vicinity, but it does not create a substantial alteration of flight times.

Discovery

The first indications of this phenomenon came from American professor Elias Loomis (1811-1889) in the 1800s, when he proposed a powerful air current in the upper air blowing west to east across the United States as an explanation for the behaviour of major storms.[5] After the 1883 eruption of the Krakatoa volcano, weather watchers tracked and mapped the effects on the sky over several years. They labelled the phenomenon the "equatorial smoke stream".[6][7] In the 1920s Japanese meteorologist Wasaburo Oishi detected the jet stream from a site near Mount Fuji.[8][9] He tracked pilot balloons ("pibals"), used to measure wind speed and direction,[10] as they rose in the air. Oishi's work largely went unnoticed outside Japan because it was published in Esperanto. American pilot Wiley Post (1898-1935), the first man to fly around the world solo in 1933, is often given some credit for discovery of jet streams. Post invented a pressurized suit that let him fly above 6,200 metres (20,300 ft). In the year before his death, Post made several attempts at a high-altitude transcontinental flight, and noticed that at times his ground speed greatly exceeded his air speed.[11]

German meteorologist Heinrich Seilkopf is credited with coining a special term, Strahlströmung (literally "jet current"), for the phenomenon in 1939.[12][13] Many sources credit real understanding of the nature of jet streams to regular and repeated flight-path traversals during World War II. Flyers consistently noticed westerly tailwinds in excess of 160 km/h (100 mph) in flights, for example, from the US to the UK.[14] Similarly in 1944 a team of American meteorologists in Guam, including Reid Bryson, had enough observations to forecast very high west winds that would slow bombers raiding Japan.[15]

Description

General configuration of the polar and subtropical jet streams
Cross section of the subtropical and polar jet streams by latitude

Polar jet streams are typically located near the 250 hPa (about 1/4 atmosphere) pressure level, or seven to twelve kilometres (23,000 to 39,000 ft) above sea level, while the weaker subtropical jet streams are much higher, between 10 and 16 kilometres (33,000 and 52,000 ft). Jet streams wander laterally dramatically, and change in altitude. The jet streams form near breaks in the tropopause, at the transitions between the polar, Ferrel and Hadley circulation cells, and whose circulation, with the Coriolis force acting on those masses, drives the jet streams. The polar jets, at lower altitude, and often intruding into mid-latitudes, strongly affect weather and aviation.[16][17] The polar jet stream is most commonly found between latitudes 30° and 60° (closer to 60°), while the subtropical jet streams are located close to latitude 30°. These two jets merge at some locations and times, while at other times they are well separated. The northern polar jet stream is said to "follow the sun" as it slowly migrates northward as that hemisphere warms, and southward again as it cools.[18][19]

The width of a jet stream is typically a few hundred kilometres or miles and its vertical thickness often less than five kilometres (16,000 feet).[20]

Jet streams are typically continuous over long distances, but discontinuities are also common.[21] The path of the jet typically has a meandering shape, and these meanders themselves propagate eastward, at lower speeds than that of the actual wind within the flow. Each large meander, or wave, within the jet stream is known as a Rossby wave (planetary wave). Rossby waves are caused by changes in the Coriolis effect with latitude.[22] Shortwave troughs, are smaller scale waves superimposed on the Rossby waves, with a scale of 1,000 to 4,000 kilometres (600–2,500 mi) long,[23] that move along through the flow pattern around large scale, or longwave, "ridges" and "troughs" within Rossby waves.[24] Jet streams can split into two when they encounter an upper-level low, that diverts a portion of the jet stream under its base, while the remainder of the jet moves by to its north.

The wind speeds are greatest where temperature differences between air masses are greatest, and often exceed 92 km/h (50 kn; 57 mph).[21] Speeds of 400 km/h (220 kn; 250 mph) have been measured.[25]

The jet stream moves from West to East bringing changes of weather.[26] Meteorologists now understand that the path of jet streams affects cyclonic storm systems at lower levels in the atmosphere, and so knowledge of their course has become an important part of weather forecasting. For example, in 2007 and 2012, Britain experienced severe flooding as a result of the polar jet staying south for the summer.[27][28][29]

Cause

Highly idealised depiction of the global circulation. The upper-level jets tend to flow latitudinally along the cell boundaries.

In general, winds are strongest immediately under the tropopause (except locally, during tornadoes, tropical cyclones or other anomalous situations). If two air masses of different temperatures or densities meet, the resulting pressure difference caused by the density difference (which ultimately causes wind) is highest within the transition zone. The wind does not flow directly from the hot to the cold area, but is deflected by the Coriolis effect and flows along the boundary of the two air masses.[30]

All these facts are consequences of the thermal wind relation. The balance of forces acting on an atmospheric air parcel in the vertical direction is primarily between the gravitational force acting on the mass of the parcel and the buoyancy force, or the difference in pressure between the top and bottom surfaces of the parcel. Any imbalance between these forces results in the acceleration of the parcel in the imbalance direction: upward if the buoyant force exceeds the weight, and downward if the weight exceeds the buoyancy force. The balance in the vertical direction is referred to as hydrostatic. Beyond the tropics, the dominant forces act in the horizontal direction, and the primary struggle is between the Coriolis force and the pressure gradient force. Balance between these two forces is referred to as geostrophic. Given both hydrostatic and geostrophic balance, one can derive the thermal wind relation: the vertical gradient of the horizontal wind is proportional to the horizontal temperature gradient. If two air masses in the northern hemisphere, one cold and dense to the north and the other hot and less dense to the south, are separated by a vertical boundary and that boundary should be removed, the difference in densities will result in the cold air mass slipping under the hotter and less dense air mass. The Coriolis effect will then cause poleward-moving mass to deviate to the East, while equatorward-moving mass will deviate toward the west. The general trend in the atmosphere is for temperatures to decrease in the poleward direction. As a result, winds develop an eastward component and that component grows with altitude. Therefore, the strong eastward moving jet streams are in part a simple consequence of the fact that the Equator is warmer than the north and south poles.[30]

Polar jet stream

The thermal wind relation does not explain why the winds are organized into tight jets, rather than distributed more broadly over the hemisphere. One factor that contributes to the creation of a concentrated polar jet is the undercutting of sub-tropical air masses by the more dense polar air masses at the polar front. This causes a sharp north-south pressure (south-north potential vorticity) gradient in the horizontal plane, an effect which is most significant during double Rossby wave breaking events.[31] At high altitudes, lack of friction allows air to respond freely to the steep pressure gradient with low pressure at high altitude over the pole. This results in the formation of planetary wind circulations that experience a strong Coriolis deflection and thus can be considered 'quasi-geostrophic'. The polar front jet stream is closely linked to the frontogenesis process in midlatitudes, as the acceleration/deceleration of the air flow induces areas of low/high pressure respectively, which link to the formation of cyclones and anticyclones along the polar front in a relatively narrow region.[21]

Subtropical jet

A second factor which contributes to a concentrated jet is more applicable to the subtropical jet which forms at the poleward limit of the tropical Hadley cell, and to first order this circulation is symmetric with respect to longitude. Tropical air rises to the tropopause, and moves poleward before sinking; this is the Hadley cell circulation. As it does so it tends to conserve angular momentum, since friction with the ground is slight. Air masses that begin moving poleward are deflected eastward by the Coriolis force (true for either hemisphere), which for poleward moving air implies an increased westerly component of the winds[32] (note that deflection is leftward in the southern hemisphere).

Other planets

Jupiter's distinctive cloud bands

Jupiter's atmosphere has multiple jet streams, caused by the convection cells that form the familiar banded color structure; on Jupiter, these convection cells are driven by internal heating.[25] The factors that control the number of jet streams in a planetary atmosphere is an active area of research in dynamical meteorology. In models, as one increases the planetary radius, holding all other parameters fixed,[clarification needed] the number of jet streams decreases.[citation needed]

Effects

Hurricane protection

Hurricane Flossie over Hawaii in 2007. Note the large band of moisture that developed East of Hawaii Island that came from the hurricane.

The subtropical jet stream rounding the base of the mid-oceanic upper trough is thought[33] to be one of the causes most of the Hawaiian Islands have been resistant to the long list of Hawaii hurricanes that have approached. For example, when Hurricane Flossie (2007) approached and dissipated just before reaching landfall, the U.S. National Oceanic and Atmospheric Administration (NOAA) cited vertical wind shear as evidenced in the photo.[33]

Uses

On Earth, the northern polar jet stream is the most important one for aviation and weather forecasting, as it is much stronger and at a much lower altitude than the subtropical jet streams and also covers many countries in the Northern Hemisphere, while the southern polar jet stream mostly circles Antarctica and sometimes the southern tip of South America. Thus, the term jet stream in these contexts usually implies the northern polar jet stream.

Aviation

Flights between Tokyo and Los Angeles using the jet stream eastbound and a great circle route westbound.

The location of the jet stream is extremely important for aviation. Commercial use of the jet stream began on 18 November 1952, when Pan Am flew from Tokyo to Honolulu at an altitude of 7,600 metres (24,900 ft). It cut the trip time by over one-third, from 18 to 11.5 hours.[34] Not only does it cut time off the flight, it also nets fuel savings for the airline industry.[35][36] Within North America, the time needed to fly east across the continent can be decreased by about 30 minutes if an airplane can fly with the jet stream, or increased by more than that amount if it must fly west against it.

Associated with jet streams is a phenomenon known as clear-air turbulence (CAT), caused by vertical and horizontal wind shear caused by jet streams.[37] The CAT is strongest on the cold air side of the jet,[38] next to and just under the axis of the jet.[39] Clear-air turbulence can cause aircraft to plunge and so present a passenger safety hazard that has caused fatal accidents, such as the death of one passenger on United Airlines Flight 826.[40][41]

Possible future power generation

Scientists are investigating ways to harness the wind energy within the jet stream. According to one estimate of the potential wind energy in the jet stream, only one percent would be needed to meet the world's current energy needs. In the late 2000s it was estimated that the required technology would reportedly take 10–20 years to develop.[42] There are two major but divergent scientific articles about jet stream power. Archer & Caldeira[43] claim that the Earth's jet streams could generate a total power of 1700 terawatts (TW) and that the climatic impact of harnessing this amount would be negligible. However, Miller, Gans, & Kleidon[44] claim that the jet streams could generate a total power of only 7.5 TW and that the climatic impact would be catastrophic.

Unpowered aerial attack

Near the end of World War II, from late 1944 until early 1945, the Japanese Fu-Go balloon bomb, a type of fire balloon, was designed as a cheap weapon intended to make use of the jet stream over the Pacific Ocean to reach the west coast of Canada and the United States . Relatively ineffective as weapons, they were used in one of the few attacks on North America during World War II, causing six deaths and a small amount of damage.[45] American scientists studying the balloons thought the Japanese might be preparing a biological attack.[46]

Changes due to climate cycles

Effects of ENSO

Impact of El Niño and La Niña on North America

El Niño-Southern Oscillation (ENSO) influences the average location of upper-level jet streams, and leads to cyclical variations in precipitation and temperature across North America, as well as affecting tropical cyclone development across the eastern Pacific and Atlantic basins. Combined with the Pacific Decadal Oscillation, ENSO can also impact cold season rainfall in Europe.[47] Changes in ENSO also change the location of the jet stream over South America, which partially affects precipitation distribution over the continent.[48]

El Niño

During El Niño events, increased precipitation is expected in California due to a more southerly, zonal, storm track.[49] During the Niño portion of ENSO, increased precipitation falls along the Gulf coast and Southeast due to a stronger than normal, and more southerly, polar jet stream.[50] Snowfall is greater than average across the southern Rockies and Sierra Nevada mountain range, and is well below normal across the Upper Midwest and Great Lakes states.[51] The northern tier of the lower 48 exhibits above normal temperatures during the fall and winter, while the Gulf coast experiences below normal temperatures during the winter season.[52][53] The subtropical jet stream across the deep tropics of the Northern Hemisphere is enhanced due to increased convection in the equatorial Pacific, which decreases tropical cyclogenesis within the Atlantic tropics below what is normal, and increases tropical cyclone activity across the eastern Pacific.[54] In the Southern Hemisphere, the subtropical jet stream is displaced equatorward, or north, of its normal position, which diverts frontal systems and thunderstorm complexes from reaching central portions of the continent.[48]

La Niña

Across North America during La Niña, increased precipitation is diverted into the Pacific Northwest due to a more northerly storm track and jet stream.[55] The storm track shifts far enough northward to bring wetter than normal conditions (in the form of increased snowfall) to the Midwestern states, as well as hot and dry summers.[56][57] Snowfall is above normal across the Pacific Northwest and western Great Lakes.[51] Across the North Atlantic, the jet stream is stronger than normal, which directs stronger systems with increased precipitation towards Europe.[58]

Dust Bowl

Evidence suggests the jet stream was at least partly responsible for the widespread drought conditions during the 1930s Dust Bowl in the Midwest United States. Normally, the jet stream flows east over the Gulf of Mexico and turns northward pulling up moisture and dumping rain onto the Great Plains. During the Dust Bowl, the jet stream weakened and changed course traveling farther south than normal. This starved the Great Plains and other areas of the Midwest of rainfall, causing extraordinary drought conditions.[59]

Longer-term climatic changes

Meanders (Rossby Waves) of the Northern Hemisphere's polar jet stream developing (a), (b); then finally detaching a "drop" of cold air (c). Orange: warmer masses of air; pink: jet stream.

Since the early 2000s, climate models have consistently identified that global warming will gradually push jet streams poleward. In 2008, this was confirmed by observational evidence, which proved that from 1979 to 2001, the northern jet stream moved northward at an average rate of 2.01 kilometres (1.25 mi) per year, with a similar trend in the Southern Hemisphere jet stream.[60][61] Climate scientists have hypothesized that the jet stream will also gradually weaken as a result of global warming. Trends such as Arctic sea ice decline, reduced snow cover, evapotranspiration patterns, and other weather anomalies have caused the Arctic to heat up faster than other parts of the globe, in what is known as the Arctic amplification. In 2021-2022, it was found that since 1979, the warming within the Arctic Circle has been nearly four times faster than the global average,[62][63] and some hotspots in the Barents Sea area warmed up to seven times faster than the global average.[64][65] While the Arctic remains one of the coldest places on Earth today, the temperature gradient between it and the warmer parts of the globe will continue to diminish with every decade of global warming as the result of this amplification. If this gradient has a strong influence on the jet stream, then it will eventually become weaker and more variable in its course, which would allow more cold air from the polar vortex to leak mid-latitudes and slow the progression of Rossby Waves, leading to more persistent and more extreme weather.

The hypothesis above is closely associated with Jennifer Francis, who had first proposed it in a 2012 paper co-authored by Stephen J. Vavrus.[66] While some paleoclimate reconstructions have suggested that the polar vortex becomes more variable and causes more unstable weather during periods of warming back in 1997,[67] this was contradicted by climate modelling, with PMIP2 simulations finding in 2010 that the Arctic oscillation was much weaker and more negative during the Last Glacial Maximum, and suggesting that warmer periods have stronger positive phase AO, and thus less frequent leaks of the polar vortex air.[68] However, a 2012 review in the Journal of the Atmospheric Sciences noted that "there [has been] a significant change in the vortex mean state over the twenty-first century, resulting in a weaker, more disturbed vortex.",[69] which contradicted the modelling results but fit the Francis-Vavrus hypothesis. Additionally, a 2013 study noted that the then-current CMIP5 tended to strongly underestimate winter blocking trends,[70] and other 2012 research had suggested a connection between declining Arctic sea ice and heavy snowfall during midlatitude winters.[71]

In 2013, further research from Francis connected reductions in the Arctic sea ice to extreme summer weather in the northern mid-latitudes,[72] while other research from that year identified potential linkages between Arctic sea ice trends and more extreme rainfall in the European summer.[73] At the time, it was also suggested that this connection between Arctic amplification and jet stream patterns was involved in the formation of Hurricane Sandy[74] and played a role in the Early 2014 North American cold wave.[75][76] In 2015, Francis' next study concluded that highly amplified jet-stream patterns are occurring more frequently in the past two decades. Hence, continued heat-trapping emissions favour increased formation of extreme events caused by prolonged weather conditions.[77]

Studies published in 2017 and 2018 identified stalling patterns of Rossby waves in the northern hemisphere jet stream as the culprit behind other almost stationary extreme weather events, such as the 2018 European heatwave, the 2003 European heat wave, 2010 Russian heat wave or the 2010 Pakistan floods, and suggested that these patterns were all connected to Arctic amplification.[78][79] Further work from Francis and Vavrus that year suggested that amplified Arctic warming is observed as stronger in lower atmospheric areas because the expanding process of warmer air increases pressure levels which decreases poleward geopotential height gradients. As these gradients are the reason that cause west to east winds through the thermal wind relationship, declining speeds are usually found south of the areas with geopotential increases.[80] In 2017, Francis explained her findings to the Scientific American: "A lot more water vapor is being transported northward by big swings in the jet stream. That's important because water vapor is a greenhouse gas just like carbon dioxide and methane. It traps heat in the atmosphere. That vapor also condenses as droplets we know as clouds, which themselves trap more heat. The vapor is a big part of the amplification story—a big reason the Arctic is warming faster than anywhere else."[81]

In a 2017 study conducted by climatologist Dr. Judah Cohen and several of his research associates, Cohen wrote that "[the] shift in polar vortex states can account for most of the recent winter cooling trends over Eurasian midlatitudes".[82] A 2018 paper from Vavrus and others linked Arctic amplification to more persistent hot-dry extremes during the midlatitude summers, as well as the midlatitude winter continental cooling.[83] Another 2017 paper estimated that when the Arctic experiences anomalous warming, primary production in North America goes down by between 1% and 4% on average, with some states suffering up to 20% losses.[84] A 2021 study found that a stratospheric polar vortex disruption is linked with extreme cold winter weather across parts of Asia and North America, including the February 2021 North American cold wave.[85][86] Another 2021 study identified a connection between the Arctic sea ice loss and the increased size of wildfires in the Western United States.[87]

However, because the specific observations are considered short-term observations, there is considerable uncertainty in the conclusions. Climatology observations require several decades to definitively distinguish various forms of natural variability from climate trends.[88] This point was stressed by reviews in 2013[89] and in 2017.[90] A study in 2014 concluded that Arctic amplification significantly decreased cold-season temperature variability over the Northern Hemisphere in recent decades. Cold Arctic air intrudes into the warmer lower latitudes more rapidly today during autumn and winter, a trend projected to continue in the future except during summer, thus calling into question whether winters will bring more cold extremes.[91] A 2019 analysis of a data set collected from 35 182 weather stations worldwide, including 9116 whose records go beyond 50 years, found a sharp decrease in northern midlatitude cold waves since the 1980s.[92]

Moreover, a range of long-term observational data collected during 2010s and published in 2020s now suggests that the intensification of Arctic amplification since the early 2010s was not linked to significant changes on midlatitude atmospheric patterns.[93][94] State-of-the-art modelling research of PAMIP (Polar Amplification Model Intercomparison Project) improved upon the 2010 findings of PMIP2 - it did find that sea ice decline would weaken the jet stream and increase the probability of atmospheric blocking, but the connection was very minor, and typically insignificant next to interannual variability.[95][96] In 2022, a follow-up study found that while the PAMIP average had likely underestimated the weakening caused by sea ice decline by 1.2 to 3 times, even the corrected connection still amounts to only 10% of the jet stream's natural variability.[97]

Additionally, a 2021 study found that while jet streams had indeed slowly moved polewards since 1960 as was predicted by models, they did not weaken, in spite of a small increase in waviness.[98] A 2022 re-analysis of the aircraft observational data collected over 2002–2020 suggested that the North Atlantic jet stream had actually strengthened.[99] Finally, a 2021 study was able to reconstruct jet stream patterns over the past 1,250 years based on Greenland ice cores, and found that all of the recently observed changes remain within range of natural variability: the earliest likely time of divergence is in 2060, under the Representative Concentration Pathway 8.5 which implies continually accelerating greenhouse gas emissions.[100]

Other upper-level jets

Polar night jet

The polar-night jet stream forms mainly during the winter months when the nights are much longer, hence polar nights, in their respective hemispheres at around 60° latitude. The polar night jet moves at a greater height (about 24,000 metres (80,000 ft)) than it does during the summer.[101] During these dark months the air high over the poles becomes much colder than the air over the Equator. This difference in temperature gives rise to extreme air pressure differences in the stratosphere, which, when combined with the Coriolis effect, create the polar night jets, that race eastward at an altitude of about 48 kilometres (30 mi).[102] The polar vortex is circled by the polar night jet. The warmer air can only move along the edge of the polar vortex, but not enter it. Within the vortex, the cold polar air becomes increasingly cold with neither warmer air from lower latitudes nor energy from the Sun entering during the polar night.[103]

Low-level jets

There are wind maxima at lower levels of the atmosphere that are also referred to as jets.

Barrier jet

A barrier jet in the low levels forms just upstream of mountain chains, with the mountains forcing the jet to be oriented parallel to the mountains. The mountain barrier increases the strength of the low level wind by 45 percent.[104] In the North American Great Plains a southerly low-level jet helps fuel overnight thunderstorm activity during the warm season, normally in the form of mesoscale convective systems which form during the overnight hours.[105] A similar phenomenon develops across Australia, which pulls moisture poleward from the Coral Sea towards cut-off lows which form mainly across southwestern portions of the continent.[106]

Coastal jet

Coastal low-level jets are related to a sharp contrast between high temperatures over land and lower temperatures over the sea and play an important role in coastal weather, giving rise to strong coast parallel winds.[107][108][109] Most coastal jets are associated with the oceanic high-pressure systems and thermal low over land.[109][110] These jets are mainly located along cold eastern boundary marine currents, in upwelling regions offshore California, Peru-Chile, Benguela, Portugal, Canary and West Australia, and offshore Yemen—Oman.[111][112][113]

Valley exit jet

A valley exit jet is a strong, down-valley, elevated air current that emerges above the intersection of the valley and its adjacent plain. These winds frequently reach speeds of up to 20 m/s (72 km/h; 45 mph) at heights of 40–200 m (130–660 ft) above the ground. Surface winds below the jet tend to be substantially weaker, even when they are strong enough to sway vegetation.

Valley exit jets are likely to be found in valley regions that exhibit diurnal mountain wind systems, such as those of the dry mountain ranges of the US. Deep valleys that terminate abruptly at a plain are more impacted by these factors than are those that gradually become shallower as downvalley distance increases.[114]

Africa

There are several important low-level jets in Africa. Numerous low-level jets form in the Sahara, and are important for the raising of dust off the desert surface. This includes a low-level jet in Chad, which is responsible for dust emission from the Bodélé Depression,[115] the world's most important single source of dust emission. The Somali Jet, which forms off the East African coast is an important component of the global Hadley circulation,[116] and supplies water vapour to the Asian Monsoon.[117] Easterly low-level jets forming in valleys within the East African Rift System help account for the low rainfall in East Africa and support high rainfall in the Congo Basin rainforest.[118] The formation of the thermal low over northern Africa leads to a low-level westerly jet stream from June into October, which provides the moist inflow to the West African monsoon.[119]

While not technically a low-level jet, the mid-level African easterly jet (at 3000–4000 m above the surface) is also an important climate feature in Africa. It occurs during the Northern Hemisphere summer between 10°N and 20°N above in the Sahel region of West Africa.[120] The mid-level easterly African jet stream is considered to play a crucial role in the West African monsoon,[121] and helps form the tropical waves which move across the tropical Atlantic and eastern Pacific oceans during the warm season.[122]

See also

References

  1. ↑ "jet stream | National Geographic Society". 2021-02-24. https://www.nationalgeographic.org/encyclopedia/jet-stream/. 
  2. ↑ "One Mystery of Jet Streams Explained" (in en). 2008-10-17. https://www.space.com/5991-mystery-jet-streams-explained.html. 
  3. ↑ University of Illinois. "Jet Stream". http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cyc/upa/jet.rxml. 
  4. ↑ US Department of Commerce, NOAA. "NWS JetStream - Layers of the Atmosphere" (in EN-US). https://www.weather.gov/jetstream/layers. 
  5. ↑ Sunny Intervals and Showers: our changing weather, p.142; Weidenfeld & Nicolson, London, 1992.
  6. ↑ Winchester, Simon (15 April 2010). "A Tale of Two Volcanos". The New York Times. https://www.nytimes.com/2010/04/16/opinion/16winchester.html. 
  7. ↑ See:
    1. Bishop, Sereno E. (17 January 1884) "Letters to the Editor: The remarkable sunsets," Nature, 29: 259–260; on page 260, Bishop speculates that a rapid current in the upper atmosphere was carrying the dust from the eruption of Krakatau westward around the equator.
    2. Bishop, S.E. (May 1884) "The equatorial smoke-stream from Krakatoa," The Hawaiian Monthly, vol. 1, no. 5, pages 106–110.
    3. Bishop, S.E. (29 January 1885) "Letters to the Editor: Krakatoa," Nature, vol. 31, pages 288–289.
    4. Rev. Sereno E. Bishop (1886) "The origin of the red glows," American Meteorological Journal, vol. 3, pages 127–136, 193–196; on pages 133–136, Bishop discusses the "equatorial smoke stream" that was produced by the eruption of Krakatau.
    5. Hamilton, Kevin (2012) "Sereno Bishop, Rollo Russell, Bishop's Ring and the discovery of the "Krakatoa easterlies"," Atmosphere-Ocean, vol. 50, no. 2, pages 169–175.
    6. Krakatoa Committee of the Royal Society [of London], The Eruption of Krakatoa and Subsequent Phenomena (London, England: Harrison and Sons, 1888). Evidence of an equatorial high-speed, high-altitude current (the quasi-biennial oscillation) is presented in the following sections:
    • Part IV., Section II. General list of dates of first appearance of all the optical phenomena. By the Hon. Rollo Russell., pages 263–312.
    • Part IV., Section III. (A). General geographic distribution of all the optical phenomena in space and time; including also velocity of translation of smoke stream. By the Hon. Rollo Russell., pages 312–326.
    • Part IV., Section III. (B). The connection between the propagation of the sky haze with its accompanying optical phenomena, and the general circulation of the atmosphere. By Mr. E. Douglas Archibald., pages 326–334; that Rev. S.E. Bishop of Honolulu first noticed a westward circulation of dust from Krakatau is acknowledged on page 333.
    • Part IV., Section III. (C). Spread of the phenomena round the world, with maps illustrative thereof. By the Hon. Rollo Russell., pages 334–339; after page 334 there are map inserts, showing the progressive spread, along the equator, of the dust from Krakatau.
  8. ↑ Lewis, John M. (2003). "Oishi's Observation: Viewed in the Context of Jet Stream Discovery". Bulletin of the American Meteorological Society 84 (3): 357–369. doi:10.1175/BAMS-84-3-357. Bibcode: 2003BAMS...84..357L. 
  9. ↑ Ooishi, W. (1926) Raporto de la Aerologia Observatorio de Tateno (in Esperanto). Aerological Observatory Report 1, Central Meteorological Observatory, Japan, 213 pages.
  10. ↑ "Pilot Weather Balloon (Pibal) Optical Theodolites". California State University Long Beach. 25 November 2009. https://home.csulb.edu/~mbrenner/balloon.htm. 
  11. ↑ Sherman, Stephen (January 2001). "Wiley Post: First to Fly Solo Around the World, in the Winnie Mae". AcePilots. http://acepilots.com/post.html. 
  12. ↑ Seilkopf, H., Maritime meteorologie, which is volume II of: R. Habermehl, ed., Handbuch der Fliegenwetterkunde [Handbook of Aeronautical Meteorology] (Berlin, Germany: Gebrüder Radetzke [Radetzke Brothers], 1939); Seilkopf coins the word "Strahlströmung" on page 142 and discusses the jet stream on pages 142–150.
  13. ↑ Arbeiten zur allgemeinen Klimatologie by Hermann Flohn p. 47
  14. ↑ "Weather Basics – Jet Streams". http://www.bbc.co.uk/weather/features/basics_jetstreams.shtml. 
  15. ↑ "When the jet stream was the wind of war". http://www.statesman.com/news/news/opinion/when-the-jet-stream-was-the-wind-of-war/nRxPD/. 
  16. ↑ David R. Cook Jet Stream Behavior. Retrieved on 8 May 2008.
  17. ↑ B. Geerts and E. Linacre. The Height of the Tropopause. Retrieved on 8 May 2008.
  18. ↑ National Weather Service JetStream. The Jet Stream. Retrieved on 8 May 2008.
  19. ↑ McDougal Littell. Paths of Polar and Subtropical Jet Streams. Retrieved on 13 May 2008.
  20. ↑ "Frequently Asked Questions About The Jet Stream". NOVA. https://www.pbs.org/wgbh/nova/balloon/science/jetstream.html. 
  21. ↑ 21.0 21.1 21.2 Glossary of Meteorology. Jet Stream. Retrieved on 8 May 2008.
  22. ↑ Rhines, Peter (2002). Rossby Waves, in Encyclopedia of Atmospheric Sciences, Holton, Pyle and Curry Eds.. Academic Press, London. p. 2780 pages. https://www.gfdl.noaa.gov/wp-content/uploads/files/user_files/io/rhines.pdf. 
  23. ↑ Glossary of Meteorology. Cyclone wave. Retrieved on 13 May 2008.
  24. ↑ Glossary of Meteorology. Short wave. Retrieved on 13 May 2008.
  25. ↑ 25.0 25.1 Robert Roy Britt. Jet Streams On Earth and Jupiter. Retrieved on 4 May 2008.
  26. ↑ Jet Streams On Earth and Jupiter. Retrieved on 4 May 2008.
  27. ↑ "Why has it been so wet?". BBC. 23 July 2007. http://news.bbc.co.uk/1/hi/magazine/6911918.stm. 
  28. ↑ Blackburn, Mike; Hoskins, Brian; Slingo, Julia: "Notes on the Meteorological Context of the UK Flooding in June and July 2007". Walker Institute for Climate System Research. 25 July 2007. http://www.walker-institute.ac.uk/news/summer_2007.pdf. 
  29. ↑ Shukman, David (10 July 2012). "Why, oh why, does it keep raining?". BBC News (BBC). https://www.bbc.co.uk/news/science-environment-18783422. 
  30. ↑ 30.0 30.1 John P. Stimac. Air pressure and wind. Retrieved on 8 May 2008.
  31. ↑ Messori, Gabriele; Caballero, Rodrigo (2015). "On double Rossby wave breaking in the North Atlantic". Journal of Geophysical Research: Atmospheres 120 (21): 11,129–11,150. doi:10.1002/2015JD023854. Bibcode: 2015JGRD..12011129M. 
  32. ↑ Lyndon State College Meteorology. Jet Stream Formation – Subtropical Jet. Retrieved on 8 May 2008.
  33. ↑ 33.0 33.1 NOAA Overview of Hurricane Flossie
  34. ↑ Taylor, Frank J. (1958). "The Jet Stream Is The Villain". Popular Mechanics: 97. https://books.google.com/books?id=5d0DAAAAMBAJ&q=1952+tokyo+honolulu&pg=PA96. Retrieved 13 December 2010. 
  35. ↑ Osborne, Tony (10 February 2020). "Strong Jet Streams Prompt Record Breaking Transatlantic Crossings". Aviation Week. https://aviationweek.com/air-transport/strong-jet-streams-prompt-record-breaking-transatlantic-crossings. 
  36. ↑ Ned Rozell. Amazing flying machines allow time travel. Retrieved on 8 May 2008.
  37. ↑ BBC. Jet Streams in the UK. Retrieved on 8 May 2008.
  38. ↑ M. P. de Villiers and J. van Heerden. Clear air turbulence over South Africa. Retrieved on 8 May 2008.
  39. ↑ Clark T. L., Hall W. D., Kerr R. M., Middleton D., Radke L., Ralph F. M., Neiman P. J., Levinson D. Origins of aircraft-damaging clear-air turbulence during the 9 December 1992 Colorado downslope windstorm : Numerical simulations and comparison with observations. Retrieved on 8 May 2008.
  40. ↑ National Transportation Safety Board. Aircraft Accident Investigation United Airlines flight 826, Pacific Ocean 28 December 1997. Retrieved on 13 May 2008.
  41. ↑ Staff writer (29 December 1997). "NTSB investigates United Airlines plunge". CNN. http://www.cnn.com/US/9712/29/united.turbulence/. 
  42. ↑ Keay Davidson. Scientists look high in the sky for power. Retrieved on 8 May 2008.
  43. ↑ Archer, C. L. and Caldeira, K. Global assessment of high-altitude wind power, IEEE T. Energy Conver., 2, 307–319, 2009. Retrieved on 24 October 2012.
  44. ↑ L.M. Miller, F. Gans, & A. Kleidon Jet stream wind power as a renewable energy resource: little power, big impacts. Earth Syst. Dynam. Discuss. 2. 201–212. 2011. Retrieved on 16 January 201208.
  45. ↑ The Fire Balloons
  46. ↑ McPhee, John (29 January 1996). "Balloons of War". The New Yorker. https://archives.newyorker.com/newyorker/1996-01-29. Retrieved 27 January 2024. 
  47. ↑ Davide Zanchettin, Stewart W. Franks, Pietro Traverso, and Mario Tomasino. On ENSO impacts on European wintertime rainfalls and their modulation by the NAO and the Pacific multi-decadal variability described through the PDO index.[|permanent dead link|dead link}}] Retrieved on 13 May 2008.
  48. ↑ 48.0 48.1 Caio Augusto dos Santos Coelho and Térico Ambrizzi. 5A.4. Climatological Studies of the Influences of El Niño Southern Oscillation Events in the Precipitation Pattern Over South America During Austral Summer. Retrieved on 13 May 2008.
  49. ↑ John Monteverdi and Jan Null. "WESTERN REGION TECHNICAL ATTACHMENT NO. 97-37 November 21, 1997: El Niño and California Precipitation." Retrieved on 28 February 2008.
  50. ↑ Climate Prediction Center. El Niño (ENSO) Related Rainfall Patterns Over the Tropical Pacific. Retrieved on 28 February 2008.
  51. ↑ 51.0 51.1 Climate Prediction Center. ENSO Impacts on United States Winter Precipitation and Temperature. Retrieved on 16 April 2008.
  52. ↑ Climate Prediction Center. Average October–December (3-month) Temperature Rankings During ENSO Events. Retrieved on 16 April 2008.
  53. ↑ Climate Prediction Center. Average December–February (3-month) Temperature Rankings During ENSO Events. Retrieved on 16 April 2008.
  54. ↑ "How do El Niño and La Nina influence the Atlantic and Pacific hurricane seasons?" (FAQ). Climate Prediction Center. http://www.cpc.noaa.gov/products/analysis_monitoring/ensostuff/ensofaq.shtml#HURRICANES. 
  55. ↑ Nathan Mantua. La Niña Impacts in the Pacific Northwest. Retrieved on 29 February 2008.
  56. ↑ Southeast Climate Consortium. SECC Winter Climate Outlook. Retrieved on 29 February 2008.
  57. ↑ Reuters . La Nina could mean dry summer in Midwest and Plains. Retrieved on 29 February 2008.
  58. ↑ Paul Simons and Simon de Bruxelles. More rain and more floods as La Niña sweeps across the globe. Retrieved on 13 May 2008.
  59. ↑ Oblack, Rachelle. "What Caused the U.S. Dust Bowl Drought of the 1930s?" (in en). https://www.thoughtco.com/1930s-dust-bowl-drought-3444382. 
  60. ↑ Archer, Cristina L.; Caldeira, Ken (18 April 2008). "Historical trends in the jet streams" (in en). Geophysical Research Letters 35 (8). doi:10.1029/2008GL033614. Bibcode: 2008GeoRL..35.8803A. 
  61. ↑ "Jet stream found to be permanently drifting north" (in en). Associated Press. 2008-04-18. http://komonews.com/news/local/jet-stream-found-to-be-permanently-drifting-north. 
  62. ↑ Rantanen, Mika; Karpechko, Alexey Yu; Lipponen, Antti; Nordling, Kalle; Hyvärinen, Otto; Ruosteenoja, Kimmo; Vihma, Timo; Laaksonen, Ari (11 August 2022). "The Arctic has warmed nearly four times faster than the globe since 1979" (in en). Communications Earth & Environment 3 (1): 168. doi:10.1038/s43247-022-00498-3. ISSN 2662-4435. Bibcode: 2022ComEE...3..168R. 
  63. ↑ "The Arctic is warming four times faster than the rest of the world" (in en). 2021-12-14. https://www.science.org/content/article/arctic-warming-four-times-faster-rest-world. 
  64. ↑ Isaksen, Ketil et al. (15 June 2022). "Exceptional warming over the Barents area" (in en). Scientific Reports 12 (1): 9371. doi:10.1038/s41598-022-13568-5. PMID 35705593. Bibcode: 2022NatSR..12.9371I. 
  65. ↑ Damian Carrington (2022-06-15). "New data reveals extraordinary global heating in the Arctic" (in en). https://www.theguardian.com/environment/2022/jun/15/new-data-reveals-extraordinary-global-heating-in-the-arctic. 
  66. ↑ Francis, Jennifer A.; Vavrus, Stephen J. (2012). "Evidence linking Arctic amplification to extreme weather in mid-latitudes". Geophysical Research Letters 39 (6): L06801. doi:10.1029/2012GL051000. Bibcode: 2012GeoRL..39.6801F. 
  67. ↑ Zielinski, G.; Mershon, G. (1997). "Paleoenvironmental implications of the insoluble microparticle record in the GISP2 (Greenland) ice core during the rapidly changing climate of the Pleistocene-Holocene transition". Bulletin of the Geological Society of America 109 (5): 547–559. doi:10.1130/0016-7606(1997)109<0547:piotim>2.3.co;2. Bibcode: 1997GSAB..109..547Z. 
  68. ↑ Lue, J.-M.; Kim, S.-J.; Abe-Ouchi, A.; Yu, Y.; Ohgaito, R. (2010). "Arctic Oscillation during the Mid-Holocene and Last Glacial Maximum from PMIP2 Coupled Model Simulations". Journal of Climate 23 (14): 3792–3813. doi:10.1175/2010JCLI3331.1. Bibcode: 2010JCli...23.3792L. 
  69. ↑ Mitchell, Daniel M.; Osprey, Scott M.; Gray, Lesley J.; Butchart, Neal; Hardiman, Steven C.; Charlton-Perez, Andrew J.; Watson, Peter (August 2012). "The Effect of Climate Change on the Variability of the Northern Hemisphere Stratospheric Polar Vortex" (in en). Journal of the Atmospheric Sciences 69 (8): 2608–2618. doi:10.1175/jas-d-12-021.1. ISSN 0022-4928. Bibcode: 2012JAtS...69.2608M. 
  70. ↑ Masato, Giacomo; Hoskins, Brian J.; Woollings, Tim (2013). "Winter and Summer Northern Hemisphere Blocking in CMIP5 Models". Journal of Climate 26 (18): 7044–7059. doi:10.1175/JCLI-D-12-00466.1. Bibcode: 2013JCli...26.7044M. 
  71. ↑ Liu, Jiping; Curry, Judith A.; Wang, Huijun; Song, Mirong; Horton, Radley M. (27 February 2012). "Impact of declining Arctic sea ice on winter snowfall" (in en). PNAS 109 (11): 4074–4079. doi:10.1073/pnas.1114910109. PMID 22371563. Bibcode: 2012PNAS..109.4074L. 
  72. ↑ Qiuhong Tang; Xuejun Zhang; Francis, J. A. (December 2013). "Extreme summer weather in northern mid-latitudes linked to a vanishing cryosphere". Nature Climate Change 4 (1): 45–50. doi:10.1038/nclimate2065. Bibcode: 2014NatCC...4...45T. 
  73. ↑ Screen, J A (November 2013). "Influence of Arctic sea ice on European summer precipitation". Environmental Research Letters 8 (4): 044015. doi:10.1088/1748-9326/8/4/044015. Bibcode: 2013ERL.....8d4015S. 
  74. ↑ Friedlander, Blaine (4 March 2013). "Arctic ice loss amplified Superstorm Sandy violence". Cornell Chronicle. http://www.news.cornell.edu/stories/2013/03/arctic-ice-loss-amplified-superstorm-sandy-violence. 
  75. ↑ Walsh, Bryan (6 January 2014). "Polar Vortex: Climate Change Might Just Be Driving the Historic Cold Snap". Time. http://science.time.com/2014/01/06/climate-change-driving-cold-weather/. Retrieved 7 January 2014. 
  76. ↑ Spotts, Pete (6 January 2014). "How frigid 'polar vortex' could be result of global warming (+video)". The Christian Science Monitor. http://www.csmonitor.com/Science/2014/0106/How-frigid-polar-vortex-could-be-result-of-global-warming-video. 
  77. ↑ Jennifer Francis; Natasa Skific (1 June 2015). "Evidence linking rapid Arctic warming to mid-latitude weather patterns". Philosophical Transactions 373 (2045): 20140170. doi:10.1098/rsta.2014.0170. PMID 26032322. Bibcode: 2015RSPTA.37340170F. 
  78. ↑ Mann, Michael E.; Rahmstorf, Stefan (27 March 2017). "Influence of Anthropogenic Climate Change on Planetary Wave Resonance and Extreme Weather Events". Scientific Reports 7: 45242. doi:10.1038/srep45242. PMID 28345645. Bibcode: 2017NatSR...745242M. 
  79. ↑ "Extreme global weather is 'the face of climate change' says leading scientist". The Guardian. 2018. https://www.theguardian.com/environment/2018/jul/27/extreme-global-weather-climate-change-michael-mann. 
  80. ↑ Francis J; Vavrus S; Cohen J. (2017). "Amplified Arctic warming and mid latitude weather: new perspectives on emerging connections". Wiley Interdisciplinary Reviews: Climate Change (2017 Wiley Periodicals,Inc) 8 (5): e474. doi:10.1002/wcc.474. Bibcode: 2017WIRCC...8E.474F. http://web.mit.edu/jlcohen/www/papers/Francis_WIREsCC_2017_pub.pdf. 
  81. ↑ Fischetti, Mark (2017). "The Arctic Is Getting Crazy". Scientific American. https://www.scientificamerican.com/article/the-arctic-is-getting-crazy/. 
  82. ↑ Kretschmer, Marlene; Coumou, Dim; Agel, Laurie; Barlow, Mathew; Tziperman, Eli; Cohen, Judah (January 2018). "More-Persistent Weak Stratospheric Polar Vortex States Linked to Cold Extremes" (in en). Bulletin of the American Meteorological Society 99 (1): 49–60. doi:10.1175/bams-d-16-0259.1. ISSN 0003-0007. Bibcode: 2018BAMS...99...49K. http://centaur.reading.ac.uk/92432/3/01Sep2020manuscript_BAMS_revised_round3.pdf. 
  83. ↑ Coumou, D.; Di Capua, G.; Vavrus, S.; Wang, L.; Wang, S. (2018-08-20). "The influence of Arctic amplification on mid-latitude summer circulation". Nature Communications 9 (1): 2959. doi:10.1038/s41467-018-05256-8. ISSN 2041-1723. PMID 30127423. PMC 6102303. Bibcode: 2018NatCo...9.2959C. http://dx.doi.org/10.1038/s41467-018-05256-8. 
  84. ↑ Kim, Jin-Soo; Kug, Jong-Seong; Jeong, Su-Jong; Huntzinger, Deborah N.; Michalak, Anna M.; Schwalm, Christopher R.; Wei, Yaxing; Schaefer, Kevin (26 October 2021). "Reduced North American terrestrial primary productivity linked to anomalous Arctic warming". Nature Geoscience 10 (8): 572–576. doi:10.1038/ngeo2986. https://www.nature.com/articles/ngeo2986. 
  85. ↑ "Climate change: Arctic warming linked to colder winters". BBC News. 2 September 2021. https://www.bbc.com/news/science-environment-58425526. 
  86. ↑ Cohen, Judah; Agel, Laurie; Barlow, Mathew; Garfinkel, Chaim I.; White, Ian (3 September 2021). "Linking Arctic variability and change with extreme winter weather in the United States". Science 373 (6559): 1116–1121. doi:10.1126/science.abi9167. PMID 34516838. Bibcode: 2021Sci...373.1116C. https://doi.org/10.1126/science.abi9167. 
  87. ↑ Zou, Yofei; Rasch, Philip J.; Wang, Hailong; Xie, Zuowei; Zhang, Rudong (26 October 2021). "Increasing large wildfires over the western United States linked to diminishing sea ice in the Arctic". Nature Communications 12 (1): 6048. doi:10.1038/s41467-021-26232-9. PMID 34702824. Bibcode: 2021NatCo..12.6048Z. 
  88. ↑ Weng, H. (2012). "Impacts of multi-scale solar activity on climate. Part I: Atmospheric circulation patterns and climate extremes". Advances in Atmospheric Sciences 29 (4): 867–886. doi:10.1007/s00376-012-1238-1. Bibcode: 2012AdAtS..29..867W. 
  89. ↑ James E. Overland (December 8, 2013). "Atmospheric science: Long-range linkage". Nature Climate Change 4 (1): 11–12. doi:10.1038/nclimate2079. Bibcode: 2014NatCC...4...11O. 
  90. ↑ Seviour, William J.M. (14 April 2017). "Weakening and shift of the Arctic stratospheric polar vortex: Internal variability or forced response?". Geophysical Research Letters 44 (7): 3365–3373. doi:10.1002/2017GL073071. Bibcode: 2017GeoRL..44.3365S. https://research-information.bris.ac.uk/en/publications/weakening-and-shift-of-the-arctic-stratospheric-polar-vortex(caf74781-222b-4735-b171-8842cead4086).html. 
  91. ↑ Screen, James A. (15 June 2014). "Arctic amplification decreases temperature variance in northern mid- to high-latitudes". Nature Climate Change 4 (7): 577–582. doi:10.1038/nclimate2268. Bibcode: 2014NatCC...4..577S. https://www.sciencedaily.com/releases/2014/06/140615143834.htm. 
  92. ↑ van Oldenborgh, Geert Jan; Mitchell-Larson, Eli; Vecchi, Gabriel A.; de Vries, Hylke; Vautar, Robert; Otto, Friederike (22 November 2019). "Cold waves are getting milder in the northern midlatitudes" (in en). Environmental Research Letters 14 (11): 114004. doi:10.1088/1748-9326/ab4867. Bibcode: 2019ERL....14k4004V. 
  93. ↑ Blackport, Russell; Screen, James A.; van der Wiel, Karin; Bintanja, Richard (September 2019). "Minimal influence of reduced Arctic sea ice on coincident cold winters in mid-latitudes". Nature Climate Change 9 (9): 697–704. doi:10.1038/s41558-019-0551-4. Bibcode: 2019NatCC...9..697B. 
  94. ↑ Blackport, Russell; Screen, James A. (February 2020). "Insignificant effect of Arctic amplification on the amplitude of midlatitude atmospheric waves". Science Advances 6 (8): eaay2880. doi:10.1126/sciadv.aay2880. PMID 32128402. Bibcode: 2020SciA....6.2880B. 
  95. ↑ Streffing, Jan; Semmler, Tido; Zampieri, Lorenzo; Jung, Thomas (24 September 2021). "Response of Northern Hemisphere Weather and Climate to Arctic Sea Ice Decline: Resolution Independence in Polar Amplification Model Intercomparison Project (PAMIP) Simulations" (in en). Journal of Climate 34 (20): 8445–8457. doi:10.1175/JCLI-D-19-1005.1. Bibcode: 2021JCli...34.8445S. 
  96. ↑ Paul Voosen (2021-05-12). "Landmark study casts doubt on controversial theory linking melting Arctic to severe winter weather" (in en). https://www.science.org/content/article/landmark-study-casts-doubt-controversial-theory-linking-melting-arctic-severe-winter. 
  97. ↑ Smith, D.M. et al. (7 February 2022). "Robust but weak winter atmospheric circulation response to future Arctic sea ice loss" (in en). Nature Communications 13 (1): 727. doi:10.1038/s41467-022-28283-y. PMID 35132058. Bibcode: 2022NatCo..13..727S. 
  98. ↑ Martin, Jonathan E. (14 April 2021). "Recent Trends in the Waviness of the Northern Hemisphere Wintertime Polar and Subtropical Jets" (in en). Journal of Geophysical Research: Atmospheres 126 (9). doi:10.1029/2020JD033668. Bibcode: 2021JGRD..12633668M. https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JD033668. 
  99. ↑ Tenenbaum, Joel; Williams, Paul D.; Turp, Debi; Buchanan, Piers; Coulson, Robert; Gill, Philip G.; Lunnon, Robert W.; Oztunali, Marguerite G. et al. (July 2022). "Aircraft observations and reanalysis depictions of trends in the North Atlantic winter jet stream wind speeds and turbulence" (in en). Quarterly Journal of the Royal Meteorological Society 148 (747): 2927–2941. doi:10.1002/qj.4342. ISSN 0035-9009. Bibcode: 2022QJRMS.148.2927T. https://onlinelibrary.wiley.com/doi/10.1002/qj.4342. 
  100. ↑ Osman, Matthew B.; Coats, Sloan; Das, Sarah B.; McConnell, Joseph R.; Chellman, Nathan (13 September 2021). "North Atlantic jet stream projections in the context of the past 1,250 years" (in en). PNAS 118 (38). doi:10.1073/pnas.2104105118. PMID 34518222. Bibcode: 2021PNAS..11804105O. 
  101. ↑ "Jet Streams around the World". BBC. http://www.bbc.co.uk/weather/features/understanding/jetstreams_world.shtml. 
  102. ↑ Gedney, Larry (1983). "The Jet Stream". University of Alaska Fairbanks. http://www.gi.alaska.edu/ScienceForum/ASF6/640.html. 
  103. ↑ "2002 Ozone-Hole Splitting – Background". Ohio State University. http://www.stat.osu.edu/~sses/collab_ozone_split_background.php. 
  104. ↑ J. D. Doyle. The influence of mesoscale orography on a coastal jet and rainband. Retrieved on 25 December 2008.
  105. ↑ Matt Kumijan, Jeffry Evans, and Jared Guyer. The Relationship of the Great Plains Low-Level Jet to Nocturnal MCS Development. Retrieved on 8 May 2008.
  106. ↑ L. Qi, L.M. Leslie, and S.X. Zhao. Cut-off low pressure systems over southern Australia: climatology and case study. Retrieved on 8 May 2008.
  107. ↑ Beardsley et al., 1987
  108. ↑ Zemba and Friehe, 1987
  109. ↑ 109.0 109.1 Pomeroy and Parish, 2001
  110. ↑ Rahn and Parish, 2007
  111. ↑ Winant et al., 1988
  112. ↑ Ranjha et al., 2013, 2015
  113. ↑ Cardoso, Rita M.; Soares, Pedro M. M.; Lima, Daniela C. A.; Semedo, Alvaro (1 December 2016). "The impact of climate change on the Iberian low-level wind jet: EURO-CORDEX regional climate simulation". Tellus A: Dynamic Meteorology and Oceanography 68 (1): 29005. doi:10.3402/tellusa.v68.29005. Bibcode: 2016TellA..6829005C. 
  114. ↑ Whiteman, C. David (2000). Mountain Meteorology, p. 193. Oxford University Press, New York. ISBN:978-0-19-803044-7, pp. 191–193.
  115. ↑ Washington, R., and Todd, M. C. (2005), Atmospheric controls on mineral dust emission from the Bodélé Depression, Chad: The role of the low level jet, Geophys. Res. Lett., 32, L17701, doi:10.1029/2005GL023597.
  116. ↑ Heaviside, C. and Czaja, A. (2013), Deconstructing the Hadley cell heat transport. Q.J.R. Meteorol. Soc., 139: 2181-2189. https://doi.org/10.1002/qj.2085
  117. ↑ Boos, W.R. and Emanuel, K.A. (2009), Annual intensification of the Somali jet in a quasi-equilibrium framework: Observational composites. Q.J.R. Meteorol. Soc., 135: 319-335. https://doi.org/10.1002/qj.388
  118. ↑ Munday, C., Savage, N., Jones, R.G. et al. Valley formation aridifies East Africa and elevates Congo Basin rainfall. Nature 615, 276–279 (2023). https://doi.org/10.1038/s41586-022-05662-5
  119. ↑ B. Pu and K. H. Cook (2008). Dynamics of the Low-Level Westerly Jet Over West Africa. American Geophysical Union, Fall Meeting 2008, abstract #A13A-0229. Retrieved on 8 March 2009.
  120. ↑ Dr. Alex DeCaria. Lesson 4 – Seasonal-mean Wind Fields. Retrieved on 3 May 2008.
  121. ↑ Kerry H. Cook. Generation of the African Easterly Jet and Its Role in Determining West African Precipitation. Retrieved on 8 May 2008.
  122. ↑ Chris Landsea. AOML Frequently Asked Questions. Subject: A4) What is an easterly wave ? Retrieved on 8 May 2008.

External links



Retrieved from "https://handwiki.org/wiki/index.php?title=Earth:Jet_stream&oldid=3298164"