Skyglow

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Mexico City at night, showing skyglow Mexico City at Night 2005.jpg
Mexico City at night, showing skyglow
A map from 1996 to 1997 showing the extent of skyglow over Europe Light pollution europe.jpg
A map from 1996 to 1997 showing the extent of skyglow over Europe

Skyglow (or sky glow) is the diffuse luminance of the night sky, apart from discrete light sources such as the Moon and visible individual stars. It is a commonly noticed aspect of light pollution. While usually referring to luminance arising from artificial lighting, skyglow may also involve any scattered light seen at night, including natural ones like starlight, zodiacal light, and airglow. [1] [2]

Contents

In the context of light pollution, skyglow arises from the use of artificial light sources, including electrical (or rarely gas) lighting used for illumination and advertisement and from gas flares. [3] Light propagating into the atmosphere directly from upward-directed or incompletely shielded sources, or after reflection from the ground or other surfaces, is partially scattered back toward the ground, producing a diffuse glow that is visible from great distances. Skyglow from artificial lights is most often noticed as a glowing dome of light over cities and towns, yet is pervasive throughout the developed world.

Causes

In this 10-second exposure, facing south toward Sagittarius, three forms of light pollution are present: skyglow, glare, and light trespass. Suburban night sky.jpg
In this 10-second exposure, facing south toward Sagittarius, three forms of light pollution are present: skyglow, glare, and light trespass.

Light used for all purposes in the outdoor and indoor environments contributes to the artificial skyglow. In fact, both intentional and unintentional usage of light such as lampposts, fixtures, and buildings illumination contribute to the scattering of the light into the atmosphere and represent one of the most detrimental effects of light pollution at night.

Part of this artificial light at night interacts with the air molecules and aerosols, and it is absorbed and scattered depending on the optical characteristics of the surrounding environment (see § Mechanism) thus creating skyglow. Whether clouds are present, this effect is amplified by the interaction with water droplets. [4]

Research indicates that when viewed from nearby, about half of skyglow arises from direct upward emissions, and half from reflected, though the ratio varies depending on details of lighting fixtures and usage, and distance of the observation point from the light source. [5] [6] In most communities, direct upward emission averages about 10–15%. [5] Fully shielded lighting (with no light emitted directly upward) decreases skyglow by about half when viewed nearby, but by much greater factors when viewed from a distance.

Skyglow is significantly amplified by the presence of snow, and within and near urban areas when clouds are present. [7] In remote areas, snow brightens the sky, but clouds make the sky darker.

In remote areas on moonless nights clouds appear dark against the sky. In or near developed areas skyglow is strongly enhanced by clouds. Effect of light pollution on clouds.jpg
In remote areas on moonless nights clouds appear dark against the sky. In or near developed areas skyglow is strongly enhanced by clouds.

Mechanism

There are two kinds of light scattering that lead to sky glow: scattering from molecules such as N2 and O2 (called Rayleigh scattering), and that from aerosols, described by Mie theory. Rayleigh scattering is much stronger for short-wavelength (blue) light, while scattering from aerosols is less affected by wavelength. Rayleigh scattering makes the sky appear blue in the daytime; the more aerosols there are, the less blue or whiter the sky appears. In many areas, most particularly in urban areas, aerosol scattering dominates, due to the heavy aerosol loading caused by modern industrial activity, power generation, farming and transportation.

Despite the strong wavelength dependence of Rayleigh scattering, its effect on sky glow for real light sources is small. Though the shorter wavelengths suffer increased scattering, this increased scattering also gives rise to increased extinction: the effects approximately balance when the observation point is near the light source. [8]

For human visual perception of sky glow, generally the assumed context under discussions of sky glow, sources rich in shorter wavelengths produce brighter sky glow, but for a different reason (see § Dependence on light source).

Measurement

Professional astronomers and light pollution researchers use various measures of luminous or radiant intensity per unit area, such as magnitudes per square arcsecond, watts per square meter per steradian,(nano-)Lamberts, or (micro-)candela per square meter. [9] All-sky maps of skyglow brightness are produced with professional-grade imaging cameras with CCD detectors and using stars as calibration sources. [10] [11] Amateur astronomers have used the Bortle Dark-Sky Scale to approximately quantify skyglow ever since it was published in Sky & Telescope magazine in February 2001. [12] The scale rates the darkness of the night sky inhibited by skyglow with nine classes and provides a detailed description of each position on the scale. Amateurs also increasingly use Sky Quality Meters (SQM) that nominally measure in astronomical photometric units of visual (Johnson V) magnitudes per square arcsecond. [note 1]

A calibrated all-sky map in the vicinity of Ashurst Lake, Arizona, showing skyglow brightness, including artificial (Phoenix and Flagstaff, Arizona) and natural sources (airglow, Milky Way) are visible (U.S. National Park Service). All-sky map of measured skyglow brightness.png
A calibrated all-sky map in the vicinity of Ashurst Lake, Arizona, showing skyglow brightness, including artificial (Phoenix and Flagstaff, Arizona) and natural sources (airglow, Milky Way) are visible (U.S. National Park Service).

Dependence on distance from source

Sky glow brightness arising from artificial light sources falls steeply with distance from the light source, due to the geometric effects characterized by an inverse square law in combination with atmospheric absorption. An approximate relation is given by

which is known as "Walker's Law." [14]

Walker's Law has been verified by observation [14] [10] to describe both the measurements of sky brightness at any given point or direction in the sky caused by a light source (such as a city), as well as to integrated measures such as the brightness of the "light dome" over a city, or the integrated brightness of the entire night sky. At very large distances (over about 50 km) the brightness falls more rapidly, largely due to extinction and geometric effects caused by the curvature of the Earth.

Dependence on light source

Sky Glow with HPS Lighting.png
Sky Glow with 4100K CCT LED Lighting.png
Sky glow and stars visible with high-pressure sodium lighting (top) and 4100K CCT LED lighting (bottom). Calibrated model of Flagstaff, Arizona, US as viewed from 10 km.

Different light sources produce differing amounts of visual sky glow. The dominant effect arises from the Purkinje shift, and not as commonly claimed from Rayleigh scattering of short wavelengths (see § Mechanism). [8] [15] When observing the night sky, even from moderately light polluted areas, the eye becomes nearly or completely dark-adapted or scotopic. The scotopic eye is much more sensitive to blue and green light, and much less sensitive to yellow and red light, than the light-adapted or photopic eye. Predominantly because of this effect, white light sources such as metal halide, fluorescent, or white LED can produce as much as 3.3 times the visual sky glow brightness of the currently most-common high-pressure sodium lamp, and up to eight times the brightness of low-pressure sodium or amber Aluminium gallium indium phosphide LED.

Sky Glow brightness ratios for different lamp types [note 2]
Lamp typeDescriptionSky glow
relative to LPS		Sky glow
relative to HPS
LPSLow-pressure sodium1.00.4
NBA-LEDamber AlGaInP LED1.00.4
HPSHigh-pressure sodium2.41.0
PCA-LEDPhosphor-converted amber LED2.41.0
FLED [note 3] 5000K CCT LED with yellow filter3.61.5
LED 2400K CCTWarm white LED4.31.8
LED 3000K CCTWarm white LED5.42.1
LED 4100K CCTNeutral white LED6.42.7
LED 5100K CCTCool white LED7.93.3
Skyglow brightness ratio (compared to low-pressure sodium) vs. distance for various lamp types. Skyglow brightness vs. distance for several light types, ratio to low-pressure sodium.png
Skyglow brightness ratio (compared to low-pressure sodium) vs. distance for various lamp types.

In detail, the effects are complex, depending both on the distance from the source as well as the viewing direction in the night sky. But the basic results of recent research are unambiguous: assuming equal luminous flux (that is, equal amounts of visible light), and matched optical characteristics of the fixtures (particularly the amount of light allowed to radiate directly upward), white sources rich in shorter (blue and green) wavelengths produce dramatically greater sky glow than sources with little blue and green. [17] The effect of Rayleigh scattering on skyglow impacts of differing light source spectra is small.

Much discussion in the lighting industry and even by some dark-sky advocacy organizations (e.g. International Dark-Sky Association) of the sky glow consequences of replacing the currently prevalent high-pressure sodium roadway lighting systems with white LEDs neglects critical issues of human visual spectral sensitivity, [18] or focuses exclusively on white LED light sources, or focuses concerns narrowly on the blue portion (<500 nm) of the spectrum. [19] [20] All of these deficiencies lead to the incorrect conclusion that increases in sky glow brightness arising from the change in light source spectrum are minimal, or that light-pollution regulations that limit the CCT of white LEDs to so-called "warm white" (i.e. CCT <4000K or 3500K) will prevent sky glow increases. [17] Improved efficiency (efficiency in distributing light onto the target area – such as the roadway – with diminished "waste" falling outside of the target area [21] and more uniform distribution patterns[ citation needed ]) can allow designers to lower lighting amounts.[ citation needed ] But efficiency improvement sufficient to overcome sky glow doubling or tripling arising from a switch to even warm-white LED from high-pressure sodium (or a 4–8x increase compared to low-pressure sodium) has not been demonstrated.

Negative effects

Skyglow is mostly unpolarized, and its addition to moonlight results in a decreased polarization signal. Humans cannot perceive this pattern, but some arthropods can. Effect of light pollution on sky polarization.jpg
Skyglow is mostly unpolarized, and its addition to moonlight results in a decreased polarization signal. Humans cannot perceive this pattern, but some arthropods can.

Skyglow, and more generally light pollution, has various negative effects: from aesthetic diminishment of the beauty of a star-filled sky, through energy and resources wasted in the production of excessive or uncontrolled lighting, to impacts on birds [22] and other biological systems, [23] including humans. Skyglow is a prime problem for astronomers, because it reduces contrast in the night sky to the extent where it may become impossible to see all but the brightest stars. [note 4]

Many nocturnal organisms are believed to navigate using the polarization signal of scattered moonlight. [25] Because skyglow is mostly unpolarized, it can swamp the weaker signal from the moon, making this type of navigation impossible. [26] Close to global coastal megacities (e.g. Tokyo, Shanghai), the natural illumination cycles provided by the moon in the marine environment are considerably disrupted by light pollution, with only nights around the full moon providing greater radiances, and over a given month lunar dosages may be a factor of 6 less than light pollution dosage. [27]

Due to skyglow, people who live in or near urban areas see thousands fewer stars than in an unpolluted sky, and commonly cannot see the Milky Way. [28] Fainter sights like the zodiacal light and Andromeda Galaxy are nearly impossible to discern even with telescopes.

Effects on the ecosystem

The effects of sky glow in relation to the ecosystem have been observed to be detrimental to a variety of organisms. The lives of plants and animals (especially those which are nocturnal) are affected as their natural environment becomes subjected to unnatural change. It can be assumed that the rate of human development technology exceeds the rate of non-human natural adaptability to their environment, therefore, organisms such as plants and animals are unable to keep up and can suffer as a consequence. [29]

Although sky glow can be the result of a natural occurrence, the presence of artificial sky glow has become a detrimental problem as urbanization continues to flourish. The effects of urbanization, commercialization, and consumerism are the result of human development; these developments in turn have ecological consequences. For example, lighted fishing fleets, offshore oil platforms, and cruise ships all bring the disruption of artificial night lighting to the world's oceans. [30]

As a whole, these effects derive from changes in orientation, disorientation, or misorientation, and attraction or repulsion from the altered light environment, which in turn may affect foraging, predator-prey dynamics, [31] [32] reproduction, [33] migration, and communication. These changes can result in the death of some species such as certain migratory birds, [34] sea creatures, [35] and nocturnal predators. [36]

Besides the effect on animals, crops and trees are also susceptible to destruction. The constant exposure to light has an impact of the photosynthesis of a plant, as a plant needs a balance of both sun and darkness in order for it to survive. In turn, the effects of sky glow can affect production rates of agriculture, especially in farming areas that are close to large city centers.[ citation needed ]

See also

Notes

  1. ↑ SQM meters have a notably different spectral response than the human eye, and even from the Johnson V response they nominally use. As a consequence SQM measures are not accurate for tracking visual impressions, particularly as spectral characteristics change from yellow sources such as HPS to white sources such as LED. Likewise, the difference between SQM measures and a true Johnson V measure is dependent on the skyglow spectrum and source(s) of artificial luminance. [13]
  2. ↑ Results for within cities or near the light source, based on work of Luginbuhl et al. [8] and Aubé et al. [15]
  3. ↑ As used on the Big Island of Hawai`i. [16]
  4. ↑ It is a widely held misunderstanding that professional astronomical observatories can "filter out" certain wavelengths of light (such as that produced by low-pressure sodium). More accurately, by leaving large portions of the spectrum relatively unpolluted, the narrow-spectrum emission from low-pressure sodium lamps and to a lesser extent from amber direct emission Aluminium gallium indium phosphide LED allows more opportunity for astronomers to "work around" the resulting light pollution. [24] Even when such lighting is widely used, skyglow still interferes with astronomical research as well as everyone's ability to see a natural star-filled sky.

Related Research Articles

<span class="mw-page-title-main">Light pollution</span> Excess artificial light in an environment

Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. In a descriptive sense, the term light pollution refers to the effects of any poorly implemented lighting sources, during the day or night. Light pollution can be understood not only as a phenomenon resulting from a specific source or kind of pollution, but also as a contributor to the wider, collective impact of various sources of pollution.

<span class="mw-page-title-main">Rayleigh scattering</span> Light scattering by small particles

Rayleigh scattering is the scattering or deflection of light, or other electromagnetic radiation, by particles with a size much smaller than the wavelength of the radiation. For light frequencies well below the resonance frequency of the scattering medium, the amount of scattering is inversely proportional to the fourth power of the wavelength. The phenomenon is named after the 19th-century British physicist Lord Rayleigh.

<span class="mw-page-title-main">Sunlight</span> Light emitted by the Sun

Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light. On Earth, sunlight is scattered and filtered through Earth's atmosphere as daylight when the Sun is above the horizon. When direct solar radiation is not blocked by clouds, it is experienced as sunshine, a combination of bright light and radiant heat (atmospheric). When blocked by clouds or reflected off other objects, sunlight is diffused. Sources estimate a global average of between 164 watts to 340 watts per square meter over a 24-hour day; this figure is estimated by NASA to be about a quarter of Earth's average total solar irradiance.

<span class="mw-page-title-main">Sky</span> Unobstructed view upward from Earth

The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct from outer space.

<span class="mw-page-title-main">Diffuse sky radiation</span> Solar radiation reaching the Earths surface

Diffuse sky radiation is solar radiation reaching the Earth's surface after having been scattered from the direct solar beam by molecules or particulates in the atmosphere. It is also called sky radiation, the determinative process for changing the colors of the sky. Approximately 23% of direct incident radiation of total sunlight is removed from the direct solar beam by scattering into the atmosphere; of this amount about two-thirds ultimately reaches the earth as photon diffused skylight radiation.

<span class="mw-page-title-main">Sodium-vapor lamp</span> Type of electric gas-discharge lamp

A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.

<span class="mw-page-title-main">Laser guide star</span> Artificial star image used by telescopes

A laser guide star is an artificial star image created for use in astronomical adaptive optics systems, which are employed in large telescopes in order to correct atmospheric distortion of light. Adaptive optics (AO) systems require a wavefront reference source of light called a guide star. Natural stars can serve as point sources for this purpose, but sufficiently bright stars are not available in all parts of the sky, which greatly limits the usefulness of natural guide star adaptive optics. Instead, one can create an artificial guide star by shining a laser into the atmosphere. Light from the beam is reflected by components in the upper atmosphere back into the telescope. This star can be positioned anywhere the telescope desires to point, opening up much greater amounts of the sky to adaptive optics.

<span class="mw-page-title-main">Night sky</span> Appearance of the sky in a clear night

The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon.

<span class="mw-page-title-main">Tyndall effect</span> Scattering of light by tiny particles in a colloidal suspension

The Tyndall effect is light scattering by particles in a colloid such as a very fine suspension. Also known as Tyndall scattering, it is similar to Rayleigh scattering, in that the intensity of the scattered light is inversely proportional to the fourth power of the wavelength, so blue light is scattered much more strongly than red light. An example in everyday life is the blue colour sometimes seen in the smoke emitted by motorcycles, in particular two-stroke machines where the burnt engine oil provides these particles. The same effect can also be observed with tobacco smoke whose fine particles also preferentially scatter blue light.

<span class="mw-page-title-main">Airglow</span> Faint emission of light by a planetary atmosphere

Airglow is a faint emission of light by a planetary atmosphere. In the case of Earth's atmosphere, this optical phenomenon causes the night sky never to be completely dark, even after the effects of starlight and diffused sunlight from the far side are removed. This phenomenon originates with self-illuminated gases and has no relationship with Earth's magnetism or sunspot activity.

The dark-sky movement is a campaign to reduce light pollution. The advantages of reducing light pollution include an increased number of stars visible at night, reducing the effects of electric lighting on the environment, improving the well-being, health and safety of people and wildlife, and cutting down on energy usage. Earth Hour and National Dark-Sky Week are two examples of such efforts.

<span class="mw-page-title-main">International Dark Sky Week</span>

International Dark Sky Week is held during the week of the new moon in April, when people worldwide may turn off their lights to observe the beauty of the night sky without light pollution. This event was founded in 2003 by high school student Jennifer Barlow of Midlothian, Virginia. It has been endorsed by the International Dark-Sky Association, the American Astronomical Society, the Astronomical League, and Sky & Telescope.

<span class="mw-page-title-main">Sky brightness</span> Visual perception of the sky and how it scatters and diffuses light

Sky brightness refers to the visual perception of the sky and how it scatters and diffuses light. The fact that the sky is not completely dark at night is easily visible. If light sources were removed from the night sky, only direct starlight would be visible.

<span class="mw-page-title-main">Cosmic infrared background</span> Infrared radiation caused by stellar dust

Cosmic infrared background is infrared radiation caused by stellar dust.

<span class="mw-page-title-main">LED street light</span> Type of lighting fixture

An LED street light or road light is an integrated light-emitting diode (LED) light fixture that is used for street lighting.

<span class="mw-page-title-main">Ecological light pollution</span> Effect of artificial light on ecosystems

Ecological light pollution is the effect of artificial light on individual organisms and on the structure of ecosystems as a whole.

<span class="mw-page-title-main">Globe at Night</span>

Globe at Night is an international scientific research program that crowdsources measurements of light pollution in the night sky. At set time periods within each year, the project asks people to count the number of stars that they can see from their location and report it to the project's website. The coordinating researchers compile this information to produce a public, freely available map of global light pollution. By September 2011, almost 70,000 measurements had been made. The use of data collected by the public makes the program an example of citizen science. Globe at Night began as a NASA educational program in the US organized by the NOAO, and was expanded internationally during the 2009 International Year of Astronomy; it is an offshoot of the GLOBE Program, which focuses on school-based science education.

<span class="mw-page-title-main">Sky quality meter</span> Instrument used to measure the luminance of the night sky

A sky quality meter (SQM) is an instrument used to measure the luminance of the night sky. It is used, typically by amateur astronomers, to quantify the skyglow aspect of light pollution and uses units of "magnitudes per square arcsecond" favored by astronomers.

The spectral G-Index is a variable that was developed to quantify the amount of short wavelength light in a visible light source relative to its visible emission. The smaller the G-index, the more blue, violet, or ultraviolet light a lamp emits relative to its total output. It is used in order to select outdoor lamps that minimize skyglow and ecological light pollution. The G-index was originally proposed by David Galadí Enríquez, an astrophysicist at Calar Alto Observatory.

<span class="mw-page-title-main">Light pollution in Hawaii</span> Unwanted artificial light in Hawaii

Light pollution is the presence of unwanted artificial light that brightens the night sky. Improperly shielded lights are the source of many of the issues regarding the light pollution in Hawai'i. Urban centers in the cities are often so bathed in light that over a hundred kilometers from the city's edge, the light pollution resulting from the glow is present. Fabio Falchi is quoted as stating that “light pollution is one of the most pervasive forms of environmental alteration” due to its destructive nature in both un- and protected areas such as national parks. Dark night skies are an important natural, cultural, scientific, educational, and economic resource for Hawai‘i.

References

  1. ↑ Roach, Franklin E. & Gordon, Janet L. (1973). The Light of the Night Sky. Dordrecht and Boston, Massachusetts: D. Reidel.
  2. ↑ Flanders, Tony (December 5, 2008). "Rate Your Skyglow". Sky & Telescope . AAS Sky Publishing. Retrieved 2020-02-26.
  3. ↑ Guerin, Emily (5 November 2015). "Oil Boom Means Sky Watchers Hoping for Starlight Just Get Stars, Lite". NPR . Retrieved 2016-04-24.
  4. ↑ Jechow, Andreas; Kolláth, Zoltán; Ribas, Salvador J.; Spoelstra, Henk; Hölker, Franz; Kyba, Christopher C.M. (2017). "Imaging and mapping the impact of clouds on skyglow with all-sky photometry". Scientific Reports. 7: 6741. doi:10.1038/s41598-017-06998-z . Retrieved 2024-12-19.
  5. 1 2 Luginbuhl, C.; Walker, C.; Wainscoat, R. (2009). "Lighting and Astronomy". Physics Today. 62 (12): 32–37. Bibcode:2009PhT....62l..32L. doi: 10.1063/1.3273014 .
  6. ↑ "Outdoor Lighting Codes". Flagstaff Dark Skies Coalition. Retrieved 17 April 2016.
  7. ↑ Kyba, C. C. M.; Ruhtz, T.; Fischer, J. & Hölker, F. (2011). Añel, Juan (ed.). "Cloud Coverage Acts as an Amplifier for Ecological Light Pollution in Urban Ecosystems". PLOS ONE. 6 (3): e17307. Bibcode:2011PLoSO...617307K. doi: 10.1371/journal.pone.0017307 . PMC   3047560 . PMID   21399694.
  8. 1 2 3 4 Luginbuhl, C.; Boley, P.; Davis, D. (2014). "The impact of light source spectral power distribution on sky glow". Journal of Quantitative Spectroscopy and Radiative Transfer. 139: 21–26. Bibcode:2014JQSRT.139...21L. doi: 10.1016/j.jqsrt.2013.12.004 .
  9. ↑ Garstang, R. (1989). "Night-Sky Brightness at Observatories and Sites". Publications of the Astronomical Society of the Pacific. 101: 306. Bibcode:1989PASP..101..306G. doi: 10.1086/132436 .
  10. 1 2 Duriscoe, D.; Luginbuhl, C.; Moore, C. (2007). "Measuring Night-Sky Brightness with a Wide-Field CCD Camera". Publications of the Astronomical Society of the Pacific. 119 (852): 192–213. arXiv: astro-ph/0702721 . Bibcode:2007PASP..119..192D. doi:10.1086/512069. S2CID   53331822.
  11. ↑ Ashley, A.; Duriscoe, D.; Luginbuhl, C. (2017). "Measuring the color and brightness of artificial sky glow from cities using an all-sky imaging system calibrated with astronomical methods in the Johnson-Cousins B and V photometric systems". American Astronomical Society, AAS Meeting. 229: 236.20. Bibcode:2017AAS...22923620P.
  12. ↑ Bortle, John E. (February 2001). "Observer's Log – Introducing the Bortle Dark-Sky Scale". Sky & Telescope . Archived from the original on 2006-03-16.
  13. ↑ Sánchez de Miguel, Alejandro; Aubé, Martin; Zamorano, Jaime; Kocifaj, Miroslav; Roby, Johanne; Tapia, Carlos (3 March 2017). "Sky Quality Meter measurements in a colour-changing world". Monthly Notices of the Royal Astronomical Society . 467 (3): 2966. arXiv: 1701.05019 . Bibcode:2017MNRAS.467.2966S. doi: 10.1093/mnras/stx145 . Retrieved 18 April 2017.
  14. 1 2 Walker, M. F. (1977). "The Effects of Urban Lighting on the Brightness of the Night Sky". Publications of the Astronomical Society of the Pacific. 89: 405. Bibcode:1977PASP...89..405W. doi: 10.1086/130142 .
  15. 1 2 Aubé, M. [in French]; Roby, J.; Kocifaj, M. (2013). "Evaluating Potential Spectral Impacts of Various Artificial Lights on Melatonin Suppression, Photosynthesis, and Star Visibility". PLOS ONE. 8 (7): e67798. Bibcode:2013PLoSO...867798A. doi: 10.1371/journal.pone.0067798 . PMC   3702543 . PMID   23861808.
  16. ↑ Smith, D. "Shift to High-Tech Streetlights Saves Dark Skies, Money". Big Island Now. Retrieved 10 April 2016.
  17. 1 2 Flagstaff Dark Skies Coalition. "Lamp Spectrum and Light Pollution". Lamp Spectrum and Light Pollution. Retrieved 10 April 2016.
  18. ↑ Bierman, A. (2012). "Will switching to LED outdoor lighting increase sky glow?". Lighting Research and Technology. 44 (4): 449–458. doi:10.1177/1477153512437147. S2CID   110024170.
  19. ↑ Ashdown, I. (20 October 2015). "Light pollution depends on the light source CCT". LEDs Magazine. PennWell Corporation. Retrieved 10 April 2016.
  20. ↑ International Dark-Sky Association. "Visibility, Environmental, and Astronomical Issues Associated with Blue – Rich White Outdoor Lighting" (PDF). International Dark-Sky Association. Retrieved 10 April 2016.
  21. ↑ "Fitted Target Efficacy metric promotes discussion". LEDs Magazine. 12 October 2009. Retrieved 18 April 2016.
  22. ↑ Fatal Light Awareness Program (FLAP)
  23. ↑ Rich, C.; Longcore, T., eds. (2006). Ecological Consequences of Artificial Night Lighting. Washington; Covelo; London: Island Press.
  24. ↑ C.B. Luginbuhl (2001). R. J. Cohen; W. T. Sullivan III (eds.). "Why Astronomy Needs Low-Pressure Sodium Lighting". Preserving the Astronomical Sky, IAU Symposium No. 196. 196: 81–86. Bibcode:2001IAUS..196...81L.
  25. ↑ Warrant, Eric; Dacke, Marie (1 January 2010). "Visual Orientation and Navigation in Nocturnal Arthropods". Brain, Behavior and Evolution. 75 (3): 156–173. doi:10.1159/000314277. PMID   20733292. S2CID   22906227.
  26. ↑ Kyba, C. C. M.; Ruhtz, T.; Fischer, J.; Hölker, F. (17 December 2011). "Lunar skylight polarization signal polluted by urban lighting". Journal of Geophysical Research. 116 (D24): D24106. Bibcode:2011JGRD..11624106K. doi: 10.1029/2011JD016698 . S2CID   56378009.
  27. ↑ Smyth, T. J.; Wright, A. E.; Edwards-Jones, A.; McKee, D.; Queirós, A.; Rendon, O.; Tidau, S.; Davies, T. W. (2022). "Disruption of marine habitats by artificial light at night from global coastal megacities". Elementa: Science of the Anthropocene. 10 (1): 00042. Bibcode:2022EleSA..10...42S. doi:10.1525/elementa.2022.00042. hdl: 10037/28198 . ISSN   2325-1026. S2CID   254213236.
  28. ↑ Falchi, F.; et al. (10 June 2016). "The new world atlas of artificial night sky brightness". Science Advances. 2 (6): e1600377. arXiv: 1609.01041 . Bibcode:2016SciA....2E0377F. doi:10.1126/sciadv.1600377. PMC   4928945 . PMID   27386582.
  29. ↑ Saleh, Tiffany. "Effect of Artificial Lighting on Wildlife". Road RIPorter. Wildlands CPR. Archived from the original on September 10, 2012. Retrieved March 7, 2012.
  30. ↑ Smyth, T. J.; Wright, A. E.; McKee, D.; Tidau, S.; Tamir, R.; Dubinsky, Z.; Iluz, D.; Davies, T. W. (2021-12-13). "A global atlas of artificial light at night under the sea". Elementa: Science of the Anthropocene. 9 (1): 00049. Bibcode:2021EleSA...9...49S. doi:10.1525/elementa.2021.00049. hdl: 10037/24006 . ISSN   2325-1026. S2CID   245169968.
  31. ↑ Rodríguez, Airam; Orozco-Valor, Paula Maiten; Sarasola, José Hernán (January 2021). "Artificial light at night as a driver of urban colonization by an avian predator". Landscape Ecology. 36 (1): 17–27. Bibcode:2021LaEco..36...17R. doi:10.1007/s10980-020-01132-3. hdl: 10261/221083 .
  32. ↑ McMahon, Oak; Smyth, Tim; Davies, Thomas W. (2022-03-25). "Broad spectrum artificial light at night increases the conspicuousness of camouflaged prey". Journal of Applied Ecology. 59 (5): 1365–2664.14146. Bibcode:2022JApEc..59.1324M. doi: 10.1111/1365-2664.14146 . hdl: 10026.1/18654 . ISSN   0021-8901. S2CID   247754178.
  33. ↑ Davies, Thomas W.; Levy, Oren; Tidau, Svenja; de Barros Marangoni, Laura Fernandes; Wiedenmann, Joerg; D’Angelo, Cecilia; Smyth, Tim (2023-05-15). "Global disruption of coral broadcast spawning associated with artificial light at night". Nature Communications. 14 (1): 2511. Bibcode:2023NatCo..14.2511D. doi: 10.1038/s41467-023-38070-y . ISSN   2041-1723. PMC   10185496 . PMID   37188683.
  34. ↑ Rodríguez, Airam; Holmes, Nick D.; Ryan, Peter G.; Wilson, Kerry-Jayne; Faulquier, Lucie; Murillo, Yovana; Raine, André F.; Penniman, Jay F.; Neves, Verónica; Rodríguez, Beneharo; Negro, Juan J.; Chiaradia, André; Dann, Peter; Anderson, Tracy; Metzger, Benjamin; Shirai, Masaki; Deppe, Lorna; Wheeler, Jennifer; Hodum, Peter; Gouveia, Catia; Carmo, Vanda; Carreira, Gilberto P.; Delgado-Alburqueque, Luis; Guerra-Correa, Carlos; Couzi, François-Xavier; Travers, Marc; Corre, Matthieu Le (October 2017). "Seabird mortality induced by land-based artificial lights: Seabird Mortality and Artificial Lights". Conservation Biology. 31 (5): 986–1001. doi:10.1111/cobi.12900. hdl: 10400.3/4515 . PMID   28151557.
  35. ↑ Marangoni, Laura F. B.; Davies, Thomas; Smyth, Tim; Rodríguez, Airam; Hamann, Mark; Duarte, Cristian; Pendoley, Kellie; Berge, Jørgen; Maggi, Elena; Levy, Oren (September 2022). "Impacts of artificial light at night in marine ecosystems—A review". Global Change Biology. 28 (18): 5346–5367. doi:10.1111/gcb.16264. hdl: 11568/1165839 . PMID   35583661.
  36. ↑ Longcore, T.; Rich, C. "Ecological Light Pollution" (PDF). Frontiers in Ecology. The Ecological Society of America. Retrieved March 3, 2012.
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