Cirrus cloud

Summary

Cirrus (cloud classification symbol: Ci) is a genus of high cloud made of ice crystals. Cirrus clouds typically appear delicate and wispy with white strands. Cirrus are usually formed when warm, dry air rises, causing water vapor deposition onto rocky or metallic dust particles at high altitudes. Globally, they form anywhere between 4,000 and 20,000 meters (13,000 and 66,000 feet) above sea level, with the higher elevations usually in the tropics and the lower elevations in more polar regions.

A picture of a bright blue sky with many different types of white cirrus clouds. The clouds are over a grassy field with a line of trees in the distance.
Sky containing different types of cirrus clouds

Cirrus clouds can form from the tops of thunderstorms and tropical cyclones and sometimes predict the arrival of rain or storms. Although they are a sign that rain and maybe storms are on the way, cirrus themselves drop no more than falling streaks of ice crystals. These crystals dissipate, melt, and evaporate as they fall through warmer and drier air and never reach ground. Cirrus clouds warm the earth, potentially contributing to climate change. A warming earth will likely produce more cirrus clouds, potentially resulting in a self-reinforcing loop.

Optical phenomena, such as sun dogs and halos, can be produced by light interacting with ice crystals in cirrus clouds. There are two other high-level cirrus-like clouds called cirrostratus and cirrocumulus. Cirrostratus looks like a sheet of cloud, whereas cirrocumulus looks like a pattern of small cloud tufts. Unlike cirrus and cirrostratus, cirrocumulus clouds contain droplets of supercooled (below freezing point) water.

Cirrus clouds form in the atmospheres of Mars, Jupiter, Saturn, Uranus, and Neptune; and on Titan, one of Saturn's larger moons. Some of these extraterrestrial cirrus clouds are made of ammonia or methane ice, much like water ice in cirrus on Earth. Some interstellar clouds, made of grains of dust smaller than a thousandth of a millimeter, are also called cirrus.

Description edit

Species of cirrus clouds
 
Cirrus castellanus
 
Cirrus fibratus
 
Cirrus floccus
 
Cirrus spissatus
 
Cirrus uncinus, commonly called mare's tails
 
Fall streaks in a cirrus cloud

Cirrus are wispy clouds made of long strands of ice crystals that are described as feathery,[1] hair-like, or layered in appearance.[2] First defined scientifically by Luke Howard in an 1803 paper,[3] their name is derived from the Latin word cirrus, meaning 'curl' or 'fringe'.[4] They are transparent, meaning that the sun can be seen through them. Ice crystals in the clouds cause them to usually appear white, but the rising or setting sun can color them various shades of yellow or red.[2][5] At dusk, they can appear gray.[5]

Cirrus comes in five visually-distinct species: castellanus, fibratus, floccus, spissatus, and uncinus:[2]

  • Cirrus castellanus has cumuliform tops caused by high-altitude convection rising up from the main cloud body.[2][6]
  • Cirrus fibratus looks striated and is the most common cirrus species.[2][6]
  • Cirrus floccus species looks like a series of tufts.[7]
  • Cirrus spissatus is a particularly dense form of cirrus that often forms from thunderstorms.[8]
  • Cirrus uncinus clouds are hooked and are the form that is usually called mare's tails.[6][9]

Each species is divided into up to four varieties: intortus, vertebratus, radiatus, and duplicatus:[10]

  • Intortus variety has an extremely contorted shape, with Kelvin–Helmholtz waves being a form of cirrus intortus that has been twisted into loops by layers of wind blowing at different speeds, called wind shear.[6]
  • Radiatus variety has large, radial bands of cirrus clouds that stretch across the sky.[6]
  • Vertebratus variety occurs when cirrus clouds are arranged side-by-side like ribs.[11]
  • Duplicatus variety occurs when cirrus clouds are arranged above one another in layers.[12]

Cirrus clouds often produce hair-like filaments called fall streaks, made of heavier ice crystals that fall from the cloud. These are similar to the virga produced in liquid–water clouds. The sizes and shapes of fall streaks are determined by the wind shear.[13]

Cirrus cloud cover varies diurnally. During the day, cirrus cloud cover drops, and during the night, it increases.[14] Based on CALIPSO satellite data, cirrus covers an average of 31% to 32% of the Earth's surface.[15] Cirrus cloud cover varies wildly by location, with some parts of the tropics reaching up to 70% cirrus cloud cover. Polar regions, on the other hand, have significantly less cirrus cloud cover, with some areas having a yearly average of only around 10% coverage.[14] These percentages treat clear days and nights, as well as days and nights with other cloud types, as lack of cirrus cloud cover.[16]

Formation edit

Cirrus clouds are usually formed as warm, dry air rises,[2] causing water vapor to undergo deposition onto rocky or metallic dust particles[17] at high altitudes. The average cirrus cloud altitude increases as latitude decreases, but the altitude is always capped by the tropopause.[18] These conditions commonly occur at the leading edge of a warm front.[19] Because absolute humidity is low at such high altitudes, this genus tends to be fairly transparent.[20] Cirrus clouds can also form inside fallstreak holes (also called "cavum").[21]

At latitudes of 65° N or S, close to polar regions, cirrus clouds form, on average, only 7,000 m (23,000 ft) above sea level. In temperate regions, at roughly 45° N or S, their average altitude increases to 9,500 m (31,200 ft) above sea level. In tropical regions, at roughly 5° N or S, cirrus clouds form 13,500 m (44,300 ft) above sea level on average. Across the globe, cirrus clouds can form anywhere from 4,000 to 20,000 m (13,000 to 66,000 ft) above sea level.[18] Cirrus clouds form with a vast range of thicknesses. They can be as little as 100 m (330 ft) from top to bottom to as thick as 8,000 m (26,000 ft). Cirrus cloud thickness is usually somewhere between those two extremes, with an average thickness of 1,500 m (4,900 ft).[22]

The jet stream, a high-level wind band, can stretch cirrus clouds long enough to cross continents.[23] Jet streaks, bands of faster-moving air in the jet stream, can create arcs of cirrus cloud hundreds of kilometers long.[24]

Cirrus cloud formation may be effected by organic aerosols (particles produced by plants) acting as additional nucleation points for ice crystal formation.[25][26] However, research suggests that cirrus clouds more commonly form on rocky or metallic particles rather than on organic ones.[17]

Tropical cyclones edit

 
A vast shield of cirrus clouds accompanying the west side of Hurricane Isabel

Sheets of cirrus clouds commonly fan out from the eye walls of tropical cyclones.[27] (The eye wall is the ring of storm clouds surrounding the eye of a tropical cyclone.[28]) A large shield of cirrus and cirrostratus typically accompanies the high altitude outflowing winds of tropical cyclones,[27] and these can make the underlying bands of rain—and sometimes even the eye—difficult to detect in satellite photographs.[29]

Thunderstorms edit

 
White cirrus in an anvil cloud

Thunderstorms can form dense cirrus at their tops. As the cumulonimbus cloud in a thunderstorm grows vertically, the liquid water droplets freeze when the air temperature reaches the freezing point.[30] The anvil cloud takes its shape because the temperature inversion at the tropopause prevents the warm, moist air forming the thunderstorm from rising any higher, thus creating the flat top.[31] In the tropics, these thunderstorms occasionally produce copious amounts of cirrus from their anvils.[32] High-altitude winds commonly push this dense mat out into an anvil shape that stretches downwind as much as several kilometers.[31]

Individual cirrus cloud formations can be the remnants of anvil clouds formed by thunderstorms. In the dissipating stage of a cumulonimbus cloud, when the normal column rising up to the anvil has evaporated or dissipated, the mat of cirrus in the anvil is all that is left.[33]

Contrails edit

Contrails are an artificial type of cirrus cloud formed when water vapor from the exhaust of a jet engine condenses on particles, which come from either the surrounding air or the exhaust itself, and freezes, leaving behind a visible trail. The exhaust can trigger the formation of cirrus by providing ice nuclei when there is an insufficient naturally-occurring supply in the atmosphere.[34] One of the environmental impacts of aviation is that persistent contrails can form into large mats of cirrus,[35] and increased air traffic has been implicated as one possible cause of the increasing frequency and amount of cirrus in Earth's atmosphere.[35][36]

Use in forecasting edit

 
High cloud weather map symbols

Random, isolated cirrus do not have any particular significance.[19] A large number of cirrus clouds can be a sign of an approaching frontal system or upper air disturbance. The appearance of cirrus signals a change in weather—usually more stormy—in the near future.[37] If the cloud is a cirrus castellanus, there might be instability at the high altitude level.[19] When the clouds deepen and spread, especially when they are of the cirrus radiatus variety or cirrus fibratus species, this usually indicates an approaching weather front. If it is a warm front, the cirrus clouds spread out into cirrostratus, which then thicken and lower into altocumulus and altostratus. The next set of clouds are the rain-bearing nimbostratus clouds.[1][19][38] When cirrus clouds precede a cold front, squall line or multicellular thunderstorm, it is because they are blown off the anvil, and the next clouds to arrive are the cumulonimbus clouds.[38] Kelvin-Helmholtz waves indicate extreme wind shear at high levels.[19] When a jet streak creates a large arc of cirrus, weather conditions may be right for the development of winter storms.[24]

Within the tropics, 36 hours prior to the center passage of a tropical cyclone, a veil of white cirrus clouds approaches from the direction of the cyclone.[39] In the mid- to late-19th century, forecasters used these cirrus veils to predict the arrival of hurricanes. In the early 1870s the president of Belén College in Havana, Father Benito Viñes, developed the first hurricane forecasting system; he mainly used the motion of these clouds in formulating his predictions.[40] He would observe the clouds hourly from 4:00 am to 10:00 pm. After accumulating enough information, Viñes began accurately predicting the paths of hurricanes; he summarized his observations in his book Apuntes Relativos a los Huracanes de las Antilles, published in English as Practical Hints in Regard to West Indian Hurricanes.[41]

Effects on climate edit

Cirrus clouds cover up to 25% of the Earth (up to 70% in the tropics at night[42]) and have a net heating effect.[43] When they are thin and translucent, the clouds efficiently absorb outgoing infrared radiation while only marginally reflecting the incoming sunlight.[44] When cirrus clouds are 100 m (330 ft) thick, they reflect only around 9% of the incoming sunlight, but they prevent almost 50% of the outgoing infrared radiation from escaping, thus raising the temperature of the atmosphere beneath the clouds by an average of 10 °C (18 °F)[45]—a process known as the greenhouse effect.[46] Averaged worldwide, cloud formation results in a temperature loss of 5 °C (9 °F) at the earth's surface, mainly the result of stratocumulus clouds.[47]

Cirrus clouds are likely becoming more common due to climate change. As their greenhouse effect is stronger than their reflection of sunlight, this would act as a self-reinforcing feedback.[48] Metallic particles from human sources act as additional nucleation seeds, potentially increasing cirrus cloud cover and thus contributing further to climate change.[17] Aircraft in the upper troposphere can create contrail cirrus clouds if local weather conditions are right. These contrails contribute to climate change.[49]

Cirrus cloud thinning has been proposed as a possible geoengineering approach to reduce climate damage due to carbon dioxide. Cirrus cloud thinning would involve injecting particles into the upper troposphere to reduce the amount of cirrus clouds. The 2021 IPCC Assessment Report expressed low confidence in the cooling effect of cirrus cloud thinning, due to limited understanding.[50]

Cloud properties edit

 
Cirrus clouds merging to cirrocumulus clouds

Scientists have studied the properties of cirrus using several different methods. Lidar (laser-based radar) gives highly accurate information on the cloud's altitude, length, and width. Balloon-carried hygrometers[a] measure the humidity of the cirrus cloud but are not accurate enough to measure the depth of the cloud. Radar units give information on the altitudes and thicknesses of cirrus clouds.[51] Another data source is satellite measurements from the Stratospheric Aerosol and Gas Experiment program. These satellites measure where infrared radiation is absorbed in the atmosphere, and if it is absorbed at cirrus altitudes, then it is assumed that there are cirrus clouds in that location.[52] NASA's Moderate-Resolution Imaging Spectroradiometer gives information on the cirrus cloud cover by measuring reflected infrared radiation of various specific frequencies during the day. During the night, it determines cirrus cover by detecting the Earth's infrared emissions. The cloud reflects this radiation back to the ground, thus enabling satellites to see the "shadow" it casts into space.[27] Visual observations from aircraft or the ground provide additional information about cirrus clouds.[52] Particle Analysis by Laser Mass Spectrometry (PALMS)[b] is used to identify the type of nucleation seeds that spawned the ice crystals in a cirrus cloud.[17]

Cirrus clouds have an average ice crystal concentration of 300,000 ice crystals per 10 cubic meters (270,000 ice crystals per 10 cubic yards). The concentration ranges from as low as 1 ice crystal per 10 cubic meters to as high as 100 million ice crystals per 10 cubic meters (just under 1 ice crystal per 10 cubic yards to 77 million ice crystals per 10 cubic yards), a difference of eight orders of magnitude. The size of each ice crystal is typically 0.25 millimeters,[22] but they range from as short as 0.01 millimeters up to several millimeters.[55] The ice crystals in contrails can be much smaller than those in naturally-occurring cirrus cloud, being around 0.001 millimeters to 0.1 millimeters in length.[34]

In addition to forming in different sizes, the ice crystals in cirrus clouds can crystallize in different shapes: solid columns, hollow columns, plates, rosettes, and conglomerations of the various other types. The shape of the ice crystals is determined by the air temperature, atmospheric pressure, and ice supersaturation (the amount by which the relative humidity exceeds 100%). Cirrus in temperate regions typically have the various ice crystal shapes separated by type. The columns and plates concentrate near the top of the cloud, whereas the rosettes and conglomerations concentrate near the base. In the northern Arctic region, cirrus clouds tend to be composed of only the columns, plates, and conglomerations, and these crystals tend to be at least four times larger than the minimum size. In Antarctica, cirrus are usually composed of only columns which are much longer than normal.[55]

Cirrus clouds are usually colder than −20 °C (−4 °F).[55] At temperatures above −68 °C (−90 °F), most cirrus clouds have relative humidities of roughly 100% (that is they are saturated).[56] Cirrus can supersaturate, with relative humidities over ice that can exceed 200%.[57][56] Below −68 °C (−90 °F) there are more of both undersaturated and supersaturated cirrus clouds.[58] The more supersaturated clouds are probably young cirrus.[56]

Optical phenomena edit

 
Circumhorizontal arc

Cirrus clouds can produce several optical effects like halos around the Sun and Moon. Halos are caused by interaction of the light with hexagonal ice crystals present in the clouds which, depending on their shape and orientation, can result in a wide variety of white and colored rings, arcs and spots in the sky, including sun dogs,[55] the 46° halo,[59] the 22° halo,[59] and circumhorizontal arcs.[60][61] Circumhorizontal arcs are only visible when the Sun rises higher than 58° above the horizon, preventing observers at higher latitudes from ever being able to see them.[62]

More rarely, cirrus clouds are capable of producing glories, more commonly associated with liquid water-based clouds such as stratus. A glory is a set of concentric, faintly-colored glowing rings that appear around the shadow of the observer, and are best observed from a high viewpoint or from a plane.[63] Cirrus clouds only form glories when the constituent ice crystals are aspherical; researchers suggest that the ice crystals must be between 0.009 millimeters and 0.015 millimeters in length for a glory to appear.[64]

Relation to other clouds edit

 
Heights of various cloud genera including high-, mid-, and low-level clouds

Cirrus clouds are one of three different genera of high-level clouds, all of which are given the prefix "cirro-". The other two genera are cirrocumulus and cirrostratus. High-level clouds usually form above 6,100 m (20,000 ft).[1][65][66] Cirrocumulus and cirrostratus are sometimes informally referred to as cirriform clouds because of their frequent association with cirrus.[67]

In the intermediate range, from 2,000 to 6,100 m (6,500 to 20,000 ft),[1][65] are the mid-level clouds, which are given the prefix "alto-". They comprise two genera, altostratus and altocumulus. These clouds are formed from ice crystals, supercooled water droplets, or liquid water droplets.[1]

Low-level clouds usually form below 2,000 m (6,500 ft) and do not have a prefix.[1][65] The two genera that are strictly low-level are stratus, and stratocumulus. These clouds are composed of water droplets, except during winter when they are formed of supercooled water droplets or ice crystals if the temperature at cloud level is below freezing. Three additional genera usually form in the low-altitude range, but may be based at higher levels under conditions of very low humidity. They are the genera cumulus, and cumulonimbus, and nimbostratus. These are sometimes classified separately as clouds of vertical development, especially when their tops are high enough to be composed of supercooled water droplets or ice crystals.[68][1]

Cirrocumulus edit

 
Large field of cirrocumulus clouds

Cirrocumulus clouds form in sheets or patches[69] and do not cast shadows. They commonly appear in regular, rippling patterns[66] or in rows of clouds with clear areas between.[1] Cirrocumulus are, like other members of the cumuliform category, formed via convective processes.[70] Significant growth of these patches indicates high-altitude instability and can signal the approach of poorer weather.[71][72] The ice crystals in the bottoms of cirrocumulus clouds tend to be in the form of hexagonal cylinders. They are not solid, but instead tend to have stepped funnels coming in from the ends. Towards the top of the cloud, these crystals have a tendency to clump together.[73] These clouds do not last long, and they tend to change into cirrus because as the water vapor continues to deposit on the ice crystals, they eventually begin to fall, destroying the upward convection. The cloud then dissipates into cirrus.[74] Cirrocumulus clouds come in four species: stratiformis, lenticularis, castellanus, and floccus.[71] They are iridescent when the constituent supercooled water droplets are all about the same size.[72]

Cirrostratus edit

 
Cirrostratus cloud

Cirrostratus clouds can appear as a milky sheen in the sky[71] or as a striated sheet.[66] They are sometimes similar to altostratus and are distinguishable from the latter because the Sun or Moon is always clearly visible through transparent cirrostratus, in contrast to altostratus which tends to be opaque or translucent.[75] Cirrostratus come in two species, fibratus and nebulosus.[71] The ice crystals in these clouds vary depending upon the height in the cloud. Towards the bottom, at temperatures of around −35 to −45 °C (−31 to −49 °F), the crystals tend to be long, solid, hexagonal columns. Towards the top of the cloud, at temperatures of around −47 to −52 °C (−53 to −62 °F), the predominant crystal types are thick, hexagonal plates and short, solid, hexagonal columns.[74][76] These clouds commonly produce halos, and sometimes the halo is the only indication that such clouds are present.[77] They are formed by warm, moist air being lifted slowly to a very high altitude.[78] When a warm front approaches, cirrostratus clouds become thicker and descend forming altostratus clouds,[1] and rain usually begins 12 to 24 hours later.[77]

Other planets edit

 
Cirrus clouds on Neptune, captured during Voyager 2's flyby

Cirrus clouds have been observed on several other planets. In 2008, the Martian Lander Phoenix took a time-lapse photograph of a group of cirrus clouds moving across the Martian sky using lidar.[79] Near the end of its mission, the Phoenix Lander detected more thin clouds close to the north pole of Mars. Over the course of several days, they thickened, lowered, and eventually began snowing. The total precipitation was only a few thousandths of a millimeter. James Whiteway from York University concluded that "precipitation is a component of the [Martian] hydrologic cycle".[80] These clouds formed during the Martian night in two layers, one around 4,000 m (13,000 ft) above ground and the other at surface level. They lasted through early morning before being burned away by the Sun. The crystals in these clouds were formed at a temperature of −65 °C (−85 °F), and they were shaped roughly like ellipsoids 0.127 millimeters long and 0.042 millimeters wide.[81]

On Jupiter, cirrus clouds are composed of ammonia. When Jupiter's South Equatorial Belt disappeared, one hypothesis put forward by Glenn Orten was that a large quantity of ammonia cirrus clouds had formed above it, hiding it from view.[82] NASA's Cassini probe detected these clouds on Saturn[83] and thin water-ice cirrus on Saturn's moon Titan.[84] Cirrus clouds composed of methane ice exist on Uranus.[85] On Neptune, thin wispy clouds which could possibly be cirrus have been detected over the Great Dark Spot. As on Uranus, these are probably methane crystals.[86]

Interstellar cirrus clouds are composed of tiny dust grains smaller than a micrometer and are therefore not true cirrus clouds, which are composed of frozen crystals.[87] They range from a few light years to dozens of light years across. While they are not technically cirrus clouds, the dust clouds are referred to as "cirrus" because of their similarity to the clouds on Earth. They emit infrared radiation, similar to the way cirrus clouds on Earth reflect heat being radiated out into space.[88]

Notes edit

  1. ^ A hygrometer is a device used to measure humidity.
  2. ^ The PALMS instrument utilizes an ultraviolet laser to vaporize aerosol particles[53] in a vacuum. The ionized particles are analyzed with a mass spectrometer to determine mass and composition.[54]

References edit

Footnotes

  1. ^ a b c d e f g h i Funk, Ted. "Cloud Classifications and Characteristics" (PDF). The Science Corner. NOAA. p. 1. Archived from the original (PDF) on 27 November 2014. Retrieved 23 February 2022.
  2. ^ a b c d e f "Cirrus clouds". Meteorological Office of the UK. Archived from the original on 23 February 2022. Retrieved 23 February 2022.
  3. ^ Howard, Luke (1865) [1803]. Essay on the Modifications of Clouds (3rd ed.). London: John Churchill & Sons. p. 3.
  4. ^ "Cirrus". Oxford English Dictionary (1st ed.). Oxford University Press. 1933.
  5. ^ a b "Ten Basic Clouds". National Weather Service: Jetstream. National Oceanic and Atmospheric Administration. Archived from the original on 21 May 2022. Retrieved 17 March 2022.
  6. ^ a b c d e Audubon 2000, p. 446
  7. ^ "Cirrus floccus (Ci flo)". International Cloud Atlas. World Meteorologizal Organization. Archived from the original on 19 March 2022. Retrieved 19 March 2022.
  8. ^ "Cirrus spissatus (Ci spi)". International Cloud Atlas. World Meteorological Organization. Archived from the original on 3 May 2022. Retrieved 19 March 2022.
  9. ^ "Cloud-busting: Mares' Tails". BBC Weather. British Broadcasting Corporation. 4 July 2016. Archived from the original on 15 March 2022. Retrieved 15 March 2022.
  10. ^ "Cirrus – Varieties". International Cloud Atlas. Archived from the original on 3 May 2022. Retrieved 23 February 2022.
  11. ^ "Vertebratus". Glossary of Meteorology. American Meteorological Society. Archived from the original on 17 March 2022. Retrieved 17 March 2022.
  12. ^ "Duplicatus". Glossary of Meteorology. American Meteorological Society. Archived from the original on 3 May 2022. Retrieved 17 March 2022.
  13. ^ "Cirrus Clouds: Thin and Wispy". Cloud Types. Department of Atmospheric Sciences at University of Illinois. Archived from the original on 25 November 2010. Retrieved 29 January 2011.
  14. ^ a b Heymsfield et al. 2017, p. 2.4
  15. ^ Gasparini et al. 2018, p. 1987
  16. ^ Gasparini et al. 2018, p. 1985
  17. ^ a b c d "The origins of cirrus: Earth's highest clouds have dusty core". NOAA Research. National Oceanic and Aerospace Administration. 9 May 2013. Archived from the original on 21 May 2022. Retrieved 17 March 2022.
  18. ^ a b Dowling & Radke 1990, p. 973
  19. ^ a b c d e Audubon 2000, p. 447
  20. ^ Palmer, Chad (16 October 2005). "Cirrus Clouds". USA Today. Archived from the original on 8 November 2008. Retrieved 13 September 2008.
  21. ^ "Cavum". International Cloud Atlas. World Meteorological Organization. Retrieved 26 September 2022.
  22. ^ a b Dowling & Radke 1990, p. 977
  23. ^ Dowling & Radke 1990, p. 974
  24. ^ a b "A Cirrus Arc". NASA Earth Observatory. National Aeronautics and Space Administration. 28 November 2019. Archived from the original on 18 March 2022. Retrieved 18 March 2022.
  25. ^ Wolf et al. 2020, p. 1
  26. ^ Cziczo, Daniel (1 October 2020). "A better understanding of how cirrus clouds form". Purdue University. Archived from the original on 3 May 2022. Retrieved 14 March 2022.
  27. ^ a b c "Cirrus Cloud Detection" (PDF). Satellite Product Tutorials. NASA (NexSat). p. 2, 3, & 5. Archived from the original (PDF) on 3 April 2019. Retrieved 29 January 2011.
  28. ^ "Tropical Cyclone Structure". NWS JetStream. National Oceanic and Atmospheric Administration. Archived from the original on 16 November 2021. Retrieved 18 March 2022.
  29. ^ "Tropical Cyclone SSMI – Composite Tutorial". United States Navy. Archived from the original on 4 December 2010. Retrieved 18 February 2011.
  30. ^ Lydolph 1985, p. 122
  31. ^ a b Grenci & Nese 2001, p. 212
  32. ^ "Computer-simulated Thunderstorms with Ice Clouds Reveal Insights for Next-generation Computer Models". Atmospheric Sciences & Global Change Division Research Highlights. Pacific Northwest National Laboratory. December 2009. p. 42. Archived from the original on 14 May 2011. Retrieved 30 January 2011.
  33. ^ Grenci & Nese 2001, p. 213
  34. ^ a b McGraw-Hill Editorial Staff 2005, p. 2
  35. ^ a b Cook-Anderson, Gretchen; Rink, Chris; Cole, Julia (27 April 2004). "Clouds Caused By Aircraft Exhaust May Warm The U.S. Climate". National Aeronautics and Space Administration. Archived from the original on 18 May 2011. Retrieved 24 June 2011.
  36. ^ Minnis et al. 2004, p. 1671
  37. ^ Battan 1974, p. 74
  38. ^ a b Whiteman 2000, p. 84
  39. ^ Central Pacific Hurricane Center (23 July 2006). "Tropical Cyclone Observations". National Oceanic and Atmospheric Administration. Archived from the original on 22 March 2017. Retrieved 5 May 2008.
  40. ^ Sheets 1990, p. 190
  41. ^ "Father Hurricane". Cable News Network, Inc. 11 March 1998. Archived from the original on 25 July 2011. Retrieved 22 February 2011.
  42. ^ Lolli et al. 2017, Section 3
  43. ^ Franks 2003, pp. 557–574
  44. ^ Stephens et al. 1990, p. 1742
  45. ^ Liou 1986, p. 1191
  46. ^ "Global Warming: Feature Articles". Earth Observatory. National Aeronautics and Space Administration. 3 June 2010. Archived from the original on 5 May 2020. Retrieved 16 October 2012.
  47. ^ "Cloud Climatology". International Satellite Cloud Climatology Program. National Aeronautics and Space Administration. Archived from the original on 30 January 2020. Retrieved 12 July 2011.
  48. ^ Forster et al. 2021, 7:66, Section 7.4.2.4.2.
  49. ^ Kärcher, Bernd (2018). "Formation and radiative forcing of contrail cirrus". Nature Communications. 9 (1): 1824. Bibcode:2018NatCo...9.1824K. doi:10.1038/s41467-018-04068-0. ISSN 2041-1723. PMC 5940853. PMID 29739923.
  50. ^ Lee et al. 2021, 4:89, Section 4.6.3.3.
  51. ^ Dowling & Radke 1990, p. 971
  52. ^ a b Dowling & Radke 1990, p. 972
  53. ^ "Particle Analysis by Laser Mass Spectrometry (PALMS)". NASA Airborne Science Program. National Aeronautics and Space Administration. Archived from the original on 3 May 2022. Retrieved 18 March 2022.
  54. ^ "Aerosol Properties & Processes: Instruments: PALMS". NOAA Chemical Sciences Laboratory. National Oceanic and Atmospheric Administration. Archived from the original on 3 May 2022. Retrieved 18 March 2022.
  55. ^ a b c d McGraw-Hill Editorial Staff 2005, p. 1
  56. ^ a b c Krämer et al. 2009, p. 3516.
  57. ^ Krämer et al. 2009, p. 3505.
  58. ^ Krämer et al. 2009, p. 3517.
  59. ^ a b Diedenhoven 2014, p. 475
  60. ^ Gilman, Victoria (19 June 2006). "Photo in the News: Rare "Rainbow" Spotted Over Idaho". National Geographic News. Archived from the original on 7 January 2007. Retrieved 30 January 2011.
  61. ^ "Fire Rainbows". News & Events. University of the City of Santa Barbara Department of Geology. 29 August 2009. Archived from the original on 12 May 2011. Retrieved 31 January 2011.
  62. ^ "Circumhorizontal arc". International Cloud Atlas. World Meteorological Organization. Archived from the original on 3 May 2022. Retrieved 15 March 2022.
  63. ^ "The Mysterious Glory". The Hong Kong Observatory. Archived from the original on 3 April 2012. Retrieved 27 June 2011.
  64. ^ Sassen et al. 1998, p. 1433
  65. ^ a b c "Classifying clouds". World Meteorological Organization. 18 January 2017. Archived from the original on 18 December 2023. Retrieved 14 March 2022.
  66. ^ a b c Hubbard 2000, p. 340
  67. ^ "Cirriform – Glossary of Meteorology". American Meteorological Society. Archived from the original on 23 February 2022. Retrieved 23 February 2022.
  68. ^ Koermer, Jim (2011). "Plymouth State Meteorology Program Cloud Boutique". Plymouth State University. Archived from the original on 10 May 2009. Retrieved 2 April 2012.
  69. ^ Miyazaki et al. 2001, p. 364
  70. ^ Parungo 1995, p. 251
  71. ^ a b c d "Common Cloud Names, Shapes, and Altitudes" (PDF). Georgia Institute of Technology. p. 2, 10–13. Archived from the original (PDF) on 12 May 2011. Retrieved 12 February 2011.
  72. ^ a b Audubon 2000, p. 448
  73. ^ Parungo 1995, p. 252
  74. ^ a b Parungo 1995, p. 254
  75. ^ Day 2005, p. 56
  76. ^ Parungo 1995, p. 256
  77. ^ a b Ahrens 2006, p. 120
  78. ^ Hamilton 2007, p. 24
  79. ^ "Clouds Move Across Mars Horizon". Phoenix Photographs. National Aeronautics and Space Administration. 19 September 2008. Archived from the original on 2 June 2016. Retrieved 15 April 2011.
  80. ^ Thompson, Andrea (2 July 2009). "How Martian Clouds Create Snowfall". Space.com. NBC News. Archived from the original on 23 September 2020. Retrieved 15 April 2011.
  81. ^ Whiteway et al. 2009, pp. 68–70
  82. ^ Phillips, Tony (20 May 2010). "Big Mystery: Jupiter Loses a Stripe". Nasa Headline News – 2010. National Aeronautics and Space Administration. Archived from the original on 20 April 2011. Retrieved 15 April 2011.
  83. ^ Dougherty & Esposito 2009, p. 118
  84. ^ "Surprise Hidden in Titan's Smog: Cirrus-Like Clouds". Mission News. National Aeronautics and Space Administration. 3 February 2011. Archived from the original on 16 April 2011. Retrieved 16 April 2011.
  85. ^ "Uranus". Scholastic. Archived from the original on 2 September 2011. Retrieved 16 April 2011.
  86. ^ Ahrens 2006, p. 12
  87. ^ Planck Science Team (2005). Planck: The Scientific Programme (Blue Book) (PDF). European Space Agency. pp. 123–124. ESA-SCI (2005)-1 V2. Archived from the original (PDF) on 31 October 2013. Retrieved 8 July 2009.
  88. ^ Koupelis 2010, p. 368

Bibliography

  • Ahrens, C. Donald (February 2006). Meteorology Today: An Introduction to Weather, Climate, and the Environment (8th ed.). Brooks Cole. ISBN 978-0-495-01162-0. OCLC 693475796.
  • Battan, Louis (1974). Weather. Foundations of Earth Science Series. Englewood Cliffs, New Jersey: Prentice Hall. p. 74. ISBN 978-0-13-947762-1.
  • Day, John A. (August 2005). The Book of Clouds. Sterling. ISBN 978-1-4027-2813-6. OCLC 61240837.
  • Diedenhoven, Bastiaan (October 2014). "The prevalence of the 22° halo in cirrus clouds". Journal of Quantitative Spectroscopy & Radiative Transfer. 146: 475–479. Bibcode:2014JQSRT.146..475V. doi:10.1016/j.jqsrt.2014.01.012. Archived from the original on 15 March 2022. Retrieved 15 March 2022.
  • Dougherty, Michele; Esposito, Larry (November 2009). Saturn from Cassini-Huygens (1st ed.). Springer. ISBN 978-1-4020-9216-9. OCLC 527635272.
  • Dowling, David R.; Radke, Lawrence F. (September 1990). "A Summary of the Physical Properties of Cirrus Clouds". Journal of Applied Meteorology. 29 (9): 970. Bibcode:1990JApMe..29..970D. doi:10.1175/1520-0450(1990)029<0970:ASOTPP>2.0.CO;2.
  • Forster, P.; Storelvmo, T.; Armour, K.; Collins, W.; et al. (2021). "Chapter 7: The Earth's energy budget, climate feedbacks, and climate sensitivity" (PDF). Climate Change 2021: The Physical Science Basis. In Press. Archived (PDF) from the original on 1 February 2022. Retrieved 19 February 2022.
  • Franks, Felix (15 March 2003). "Nucleation of ice and its management in ecosystems". Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences. 361 (1804): 557–74, discussion 574. Bibcode:2003RSPTA.361..557F. doi:10.1098/rsta.2002.1141. PMID 12662454. S2CID 25606767.
  • Gasparini, B; Meyer, A; Neubauer, D; Münch, S; Lohmann, U (1 March 2018). "Cirrus Cloud Properties as Seen by the CALIPSO Satellite and ECHAM-HAM Global Climate Model". Journal of Climate. 31 (5). American Meteorological Society: 1983–2003. Bibcode:2018JCli...31.1983G. doi:10.1175/JCLI-D-16-0608.1. S2CID 134648921.
  • Grenci, Lee M.; Nese, Jon M. (August 2001). A World of Weather: Fundamentals of Meteorology: A Text / Laboratory Manual (3rd ed.). Kendall/Hunt Publishing Company. ISBN 978-0-7872-7716-1. OCLC 51160155.
  • Hamilton, Gina (1 September 2007). Blue Planet – Air (eBook). Milliken Publishing. ISBN 978-1-4291-1613-8.
  • Heymsfield; Krämer; Luebke; Brown; Cziczo; Franklin; Lawson; Lohmann; McFarquhar; Ulanowski; Van Tricht (1 January 2017). "Cirrus Clouds". Meteorological Monographs. 58 (1). American Meteorological Society: 2.1–2.26. Bibcode:2017MetMo..58....2H. doi:10.1175/AMSMONOGRAPHS-D-16-0010.1. hdl:1721.1/118399. Archived from the original on 29 March 2022. Retrieved 19 March 2022.
  • Hubbard, Richard Keith (5 May 2000). "Glossary". Boater's Bowditch: The Small Craft American Practical Navigator (2nd ed.). International Marine/Ragged Mountain Press. ISBN 978-0-07-136136-1.
  • Koupelis, Theo (February 2010). In Quest of the Universe (6th ed.). Jones & Bartlett Publishers. ISBN 978-0-7637-6858-4. OCLC 489012016.
  • Krämer M, Schiller C, Afchine A, Bauer R, Gensch I, Mangold A, Schlicht S, Spelten N, Sitnikov N, Borrmann S, de Reus M, Spichtinger P (June 2009). "Ice Supersaturations and Cirrus Cloud Crystal Numbers" (PDF). Atmospheric Chemistry and Physics. 9 (11): 3505–3522. Bibcode:2009ACP.....9.3505K. doi:10.5194/acp-9-3505-2009. Archived (PDF) from the original on 19 January 2022. Retrieved 24 February 2022.
  • Lee, June-Yi; Marotzke, Jochem; Bala, Govindasamy; Cao, Cao; et al. (2021). "Chapter 4: Future global climate: scenario-based projections and near-term information" (PDF). Climate Change 2021: The Physical Science Basis. Archived (PDF) from the original on 5 September 2021. Retrieved 19 February 2022.
  • Liou, Kuo-Nan (June 1986). "Influence of Cirrus Clouds on Weather and Climate Processes: A Global Perspective" (PDF). Monthly Weather Review. 114 (6): 1167–1199. Bibcode:1986MWRv..114.1167L. doi:10.1175/1520-0493(1986)114<1167:IOCCOW>2.0.CO;2. OCLC 4645992610. Archived (PDF) from the original on 14 May 2011. Retrieved 29 January 2011.
  • Lolli, Simone; Campbell, James R.; Lewis, Jasper R.; Gu, Yu; Marquis, Jared W.; Chew, Boon Ning; Liew, Soo-Chin; Salinas, Santo V.; Welton, Ellsworth J. (9 February 2017). "Daytime Top-of-the-Atmosphere Cirrus Cloud Radiative Forcing Properties at Singapore". Journal of Applied Meteorology and Climatology. 56 (5): 1249–1257. Bibcode:2017JApMC..56.1249L. doi:10.1175/JAMC-D-16-0262.1. hdl:11603/17229. ISSN 1558-8424. S2CID 125708865.
  • Ludlum, David McWilliams (2000). National Audubon Society Field Guide to Weather. Alfred A. Knopf. ISBN 978-0-679-40851-2. OCLC 56559729.
  • Lydolph, Paul E. (January 1985). The Climate of The Earth. Rowman and Allenheld. p. 122. ISBN 978-0-86598-119-5. OCLC 300400246.
  • McGraw-Hill Editorial Staff (2005). McGraw-Hill Yearbook of Science & Technology for 2005 (PDF). McGraw-Hill Companies, Inc. ISBN 978-0-07-144504-7. Archived from the original (PDF) on 6 October 2008.
  • Minnis, Patrick; Ayers, J. Kirk; Palikonda, Rabindra; Phan, Dung (April 2004). "Contrails, Cirrus Trends, and Climate". Journal of Climate. 17 (8): 1671. Bibcode:2004JCli...17.1671M. doi:10.1175/1520-0442(2004)017<1671:CCTAC>2.0.CO;2.
  • Miyazaki, Ryo; Yoshida, Satoru; Dobashit, Yoshinori; Nishita, Tomoyula (2001). "A method for modeling clouds based on atmospheric fluid dynamics". Proceedings Ninth Pacific Conference on Computer Graphics and Applications. Pacific Graphics 2001. p. 363. CiteSeerX 10.1.1.76.7428. doi:10.1109/PCCGA.2001.962893. ISBN 978-0-7695-1227-3. S2CID 6656499.
  • Parungo, F. (May 1995). "Ice Crystals in High Clouds and Contrails". Atmospheric Research. 38 (1–4): 249–262. Bibcode:1995AtmRe..38..249P. doi:10.1016/0169-8095(94)00096-V. OCLC 90987092.
  • Sassen, Kenneth; Arnott, W. Patrick; Barnett, Jennifer M.; Aulenbach, Steve (March 1998). "Can Cirrus Clouds Produce Glories?" (PDF). Applied Optics. 37 (9): 1427–1433. Bibcode:1998ApOpt..37.1427S. CiteSeerX 10.1.1.21.1512. doi:10.1364/AO.37.001427. OCLC 264468338. PMID 18268731. Archived from the original (PDF) on 21 June 2004. Retrieved 29 January 2011.
  • Sheets, Robert C. (June 1990). "The National Hurricane Center—Past, Present and Future". Weather and Forecasting. 5 (2): 185–232. Bibcode:1990WtFor...5..185S. doi:10.1175/1520-0434(1990)005<0185:TNHCPA>2.0.CO;2.
  • Stephens, Graeme L.; Tsay, Si-Chee; Stackhouse, Paul W. Jr.; Flatau, Piotr J. (July 1990). "The Relevance of the Microphysical and Radiative Properties of Cirrus Clouds to Climate and Climatic Feedback". Journal of the Atmospheric Sciences. 47 (14): 1742. Bibcode:1990JAtS...47.1742S. doi:10.1175/1520-0469(1990)047<1742:TROTMA>2.0.CO;2.
  • Whiteman, Charles David (May 2000). Mountain Meteorology: Fundamentals and Applications (1st ed.). Oxford University Press, USA. ISBN 978-0-19-513271-7. OCLC 41002851.
  • Whiteway JA, Komguem L, Dickinson C, Cook C, Illnicki M, Seabrook J, Popovici V, Duck TJ, Davy R, Taylor PA, Pathak J, Fisher D, Carswell AI, Daly M, Hipkin V, Zent AP, Hecht MH, Wood SE, Tamppari LK, Renno N, Moores JE, Lemmon MT, Daerden F, Smith PH (3 July 2009). "Mars Water-Ice Clouds and Precipitation". Science Magazine. 325 (5936): 68–70. Bibcode:2009Sci...325...68W. CiteSeerX 10.1.1.1032.6898. doi:10.1126/science.1172344. PMID 19574386. S2CID 206519222.
  • Wolf, Martin J.; Zhang, Yue; Zawadowicz, Maria A.; Goodell, Megan; Froyd, Karl; Freney, Evelyn; Sellegri, Karine; Rösch, Michael; Cui, Tianqu; Winter, Margaux; Lacher, Larissa; Axisa, Duncan; DeMott, Paul J.; Levin, Ezra J. T.; Gute, Ellen; Abbatt, Jonathan; Koss, Abigail; Kroll, Jesse H.; Surratt, Jason D.; Cziczo, Daniel J. (1 October 2020). "A biogenic secondary organic aerosol source of cirrus ice nucleating particles". Nature Communications. 11 (1): 4834. Bibcode:2020NatCo..11.4834W. doi:10.1038/s41467-020-18424-6. PMC 7529764. PMID 33004794.