Quantitative analysis of night skyglow amplification under cloudy conditions

Kocifaj, Miroslav; Lamphar, Héctor

doi:10.1093/mnras/stu1301

Cited by 28 publications

(20 citation statements)

References 23 publications

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“…Artificial light at night (ALAN) is emerging as another potential threat to biodiversity world-wide (Bennie, Duffy, Davies, Correa-Cano, & Gaston, 2015;Davies & Smyth, 2018). It can be detected dozens of kilometres away from a major source like a city by biological photoreceptors (Aubé, 2015;Kocifaj & Lamphar, 2014), whose sensitivity can be very high for nocturnal species (Kelber & Roth, 2006;Kelber, Yovanovich, & Olsson, 2017). The latter is produced by the scattering of light by atmospheric particles and aerosols from distant sources.…”

Section: Al An a S An Emerg Ent G Lobal Ris K For B Iodiver S It Ymentioning

confidence: 99%

“…The spatial extent of ALAN during overcast nights is much broader (Kocifaj & Lamphar, 2014;Kyba et al, 2011). Clouds amplify light emitted from the ground, extend the photophase in light-polluted areas whereas they mask celestial objects, dim their lights, and shorten the photophase in non-polluted areas.…”

Section: Natur Al Fac Tor S Modul Ating E Xp Osure To Al An At the mentioning

confidence: 99%

“…Cloud cover reflects artificial light downward and over large distances. For this reason, it has been identified as a major factor enhancing nocturnal light levels (Kocifaj & Lamphar, 2014;Kyba, Ruhtz, Fischer, & Hölker, 2011). ALAN intensity, as measured by satellites, has kept increasing world-wide over recent decades, with local or regional variations (Falchi et al, 2016), and changes were recently detected over a short 5-year period for most countries (Kyba, Kuester, et al, 2017).…”

Section: The G Eog R Aphi C Al E X Tent Of Al An and Its Effec T Onmentioning

confidence: 99%

See 2 more Smart Citations

Assessing the effects of artificial light at night on biodiversity across latitude – Current knowledge gaps

Secondi

Davranche

Théry

et al. 2019

Global Ecol Biogeogr

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Aim: Exposure to artificial light at night (ALAN) is a risk factor for organisms.Considering the spread and increasing intensity of night brightness across the globe, and the key role of light at all biological levels, alterations of ecosystems are ex-pected. Yet, we cannot predict the severity of the effects of ALAN in several biomes because little information is available outside the temperate zone. We reviewed current knowledge and identified traits that could be targeted to fill this knowledge gap in order to contribute to the elaboration of a biogeographical framework for the study of ALAN at the global scale. Location: Global.Time period: Current and next decades. Methods:We analysed the latitudinal variation in ALAN and focused on environmental factors that vary with latitude but that have been overlooked. We reviewed biological traits that exhibit latitudinal variation and depend on light and photoperiod and compiled information about the predicted changes in human demography and road networks across different world regions. Results:Cloud cover amplifies ALAN far away from urbanized areas. Because of the higher frequency of overcast sky nights, exposure effects may be stronger both at high latitudes and across a large fraction of the intertropical zone, although at different times of the year. Intertropical biomes host the largest fraction of global biodiversity. Although currently they are not the most exposed to ALAN, their human populations are growing, and urbanized areas and road networks are expanding.Hence, ALAN could have strong ecological consequences, with cloud cover as an aggravating factor. Perspectives: Knowledge gaps currently limit our ability to predict the effects of ALAN in different biomes. Therefore, it will be important to start investigating the consequences of this novel environmental factor across the globe, in order to develop a relevant theoretical framework. K E Y W O R D SALAN, biogeography, exposure, global change, intertropical, latitude, light pollution | 405 SECONDI Et al.

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Section: Al An a S An Emerg Ent G Lobal Ris K For B Iodiver S It Ymentioning

confidence: 99%

Section: Natur Al Fac Tor S Modul Ating E Xp Osure To Al An At the mentioning

confidence: 99%

Section: The G Eog R Aphi C Al E X Tent Of Al An and Its Effec T Onmentioning

confidence: 99%

See 1 more Smart Citation

Assessing the effects of artificial light at night on biodiversity across latitude – Current knowledge gaps

Secondi

Davranche

Théry

et al. 2019

Global Ecol Biogeogr

View full text Add to dashboard Cite

show abstract

“…However, this is not valid for most scenarios, as usually the NSB is not uniform [16,20,21,39]. Therefore, the horizontal illuminance can only be roughly approximated from narrow angle zenith measurements alone [27,39].…”

Section: Horizontal and Scalar Illuminancementioning

confidence: 99%

“…They concentrated their investigations on clear sky conditions and the ability to observe celestial objects. However, illumination conditions due to LP and artificial skyglow (the backscattered portion of the upwelling ALAN) vary dramatically with meteorological conditions, especially clouds [19][20][21][22]. Recent work on clouds was linking NSB data with laser ceilometer measurements [22].…”

Section: Introductionmentioning

confidence: 99%

Measuring Light Pollution with Fisheye Lens Imagery from A Moving Boat – A Proof of Concept

Jechow¹,

Kollath²,

Lerner³

et al. 2017

IJSL

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Near all-sky imaging photometry was performed from a boat on the Gulf of Aqaba to measure the night sky brightness in a coastal environment. The boat was not anchored, and therefore drifted and rocked. The camera was mounted on a tripod without any inertia/motion stabilization. A commercial digital single lens reflex (DSLR) camera and fisheye lens were used with ISO setting of 6400, with the exposure time varied between 0.5 s and 5 s. We find that despite movement of the vessel the measurements produce quantitatively comparable results apart from saturation effects. We discuss the potential and limitations of this method for mapping light pollution in marine and freshwater systems. This work represents the proof of concept that all-sky photometry with a commercial DSLR camera is a viable tool to determine light pollution in an ecological context from a moving boat.

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Areas of ecological importance are exposed to risk from urban sky glow: Auckland, Aotearoa-New Zealand as a case study

et al. 2021

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Quantitative analysis of night skyglow amplification under cloudy conditions

Cited by 28 publications

References 23 publications

Assessing the effects of artificial light at night on biodiversity across latitude – Current knowledge gaps

Assessing the effects of artificial light at night on biodiversity across latitude – Current knowledge gaps

Measuring Light Pollution with Fisheye Lens Imagery from A Moving Boat – A Proof of Concept

Areas of ecological importance are exposed to risk from urban sky glow: Auckland, Aotearoa-New Zealand as a case study

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