Salvador Bará
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View article: Trust, but verify: Reducing artificial light emissions and monitoring compliance
Trust, but verify: Reducing artificial light emissions and monitoring compliance Open
In order to reduce light pollution we have to reduce the overall amount of artificial light emissions. This is a consequence of the basic rules governing the propagation of light in the terrestrial environment. In this work I revisit the p…
View article: Nocturnal camouflage through background matching against moonlight
Nocturnal camouflage through background matching against moonlight Open
Camouflage is often considered a daytime phenomenon based on light and shade. Nocturnal camouflage can also occur, but its mechanistic basis remains unclear. Here, we analyze the conditions for background matching (BM) of avian predators a…
View article: Diverging evolution of light pollution indicators: can the Globe at Night and VIIRS-DNB measurements be reconciled?
Diverging evolution of light pollution indicators: can the Globe at Night and VIIRS-DNB measurements be reconciled? Open
The radiance of nighttime artificial lights measured by the VIIRS-DNB instrument on board the satellite Suomi-NPP increases at an average rate ~2.2 %/yr worldwide, whereas the artificial radiance of the night sky deduced from the Globe at …
View article: Outdoor artificial light-at-night and cardiometabolic disease risk: an urban perspective from the Catalan GCAT cohort study
Outdoor artificial light-at-night and cardiometabolic disease risk: an urban perspective from the Catalan GCAT cohort study Open
We investigated the association between outdoor artificial light-at-night (ALAN) exposure and cardiometabolic risk in the GCAT study. We included 9752 participants from Barcelona (59% women) and used satellite images (30 m resolution) and …
View article: Detecting changes in anthropogenic light emissions: limits due to atmospheric variability
Detecting changes in anthropogenic light emissions: limits due to atmospheric variability Open
Monitoring the evolution of the anthropogenic light emissions is a priority task in light pollution research. Among the complementary approaches that can be adopted to achieve this goal stand out those based on measuring the direct radianc…
View article: ENLIGHT: A consensus checklist for reporting laboratory-based studies on the non-visual effects of light in humans
ENLIGHT: A consensus checklist for reporting laboratory-based studies on the non-visual effects of light in humans Open
View article: Artificial light at night: a global disruptor of the night-time environment
Artificial light at night: a global disruptor of the night-time environment Open
Light pollution is the alteration of the natural levels of darkness by an increased concentration of light particles in the night-time environment, resulting from human activity. Light pollution is profoundly changing the night-time enviro…
View article: Quantifying the visual impact of wind farm lights on the nocturnal landscape
Quantifying the visual impact of wind farm lights on the nocturnal landscape Open
In this work we present a simple model for quantifying the visual impact of individual wind turbine lights, based on the comparison of their brightnesses with the brightness of well-known night sky objects
View article: Quantifying the visual impact of wind farm lights on the nocturnal landscape
Quantifying the visual impact of wind farm lights on the nocturnal landscape Open
Wind farm lights are a conspicuous feature in the nocturnal landscape. Their presence is a source of light pollution for residents and the environment, severely disrupting in some places the aesthetic, cultural, and scientific values of th…
View article: Skyglow inside your eyes: intraocular scattering and artificial brightness of the night sky
Skyglow inside your eyes: intraocular scattering and artificial brightness of the night sky Open
The visual perception of the natural night sky in many places of the world is strongly disturbed by anthropogenic light. Part of this artificial light is scattered in the atmosphere and propagates towards the observer, adding to the natura…
View article: A call for scientists to halt the spoiling of the night sky with artificial light and satellites
A call for scientists to halt the spoiling of the night sky with artificial light and satellites Open
View article: Aggregate Effects of Proliferating LEO Objects and Implications for Astronomical Data Lost in the Noise
Aggregate Effects of Proliferating LEO Objects and Implications for Astronomical Data Lost in the Noise Open
The rising population of artificial satellites and associated debris in low-altitude orbits is increasing the overall brightness of the night sky, threatening ground-based astronomy as well as a diversity of stakeholders and ecosystems rel…
View article: On the Posch ratio for irradiance in coastal waters and the high seas
On the Posch ratio for irradiance in coastal waters and the high seas Open
View article: Light pollution is skyrocketing
Light pollution is skyrocketing Open
Data from citizen scientists reveal a worrying growth in light pollution over the past decade
View article: Vertical distribution of aerosol extinction coefficients at night derived from radiometry of scattered laser light
Vertical distribution of aerosol extinction coefficients at night derived from radiometry of scattered laser light Open
Determining the nighttime aerosol extinction coefficient profile in the lower atmosphere through optical measurements is a necessary but challenging task in environmental science due, among other factors, to the lack of a suitable extra-at…
View article: Skyglow inside your eyes: intraocular scattering and artificial brightness of the night sky
Skyglow inside your eyes: intraocular scattering and artificial brightness of the night sky Open
The visual perception of the natural night sky in many places of the world is strongly disturbed by anthropogenic light. Part of this artificial light is scattered in the atmosphere and propagates towards the observer, adding to the natura…
View article: Modeling the artificial night sky brightness at short distances from streetlights
Modeling the artificial night sky brightness at short distances from streetlights Open
Contrary to some widespread intuitive belief, the night sky brightness\nperceived by the human eye or any other physical detector does not come\n(exclusively) from high in the sky. The detected brightness is built up from\nthe scattered ra…
View article: Controlling the artificial radiance of the night sky: The Añora urban laboratory
Controlling the artificial radiance of the night sky: The Añora urban laboratory Open
We provide radiometric evidence of the relevance of nearby light sources on the artificial brightness of the night sky. To obtain the required data we developed a method based on the use of power-regulated urban lighting systems, which als…
View article: Quantitative evaluation of outdoor artificial light emissions using low Earth orbit radiometers
Quantitative evaluation of outdoor artificial light emissions using low Earth orbit radiometers Open
View article: Exposure to artificial light-at-night and cardiometabolic health: an urban perspective from the Catalan GCAT cohort study
Exposure to artificial light-at-night and cardiometabolic health: an urban perspective from the Catalan GCAT cohort study Open
BACKGROUND AND AIM It has been suggested that artificial light-at-night (ALAN) exposure may lead to metabolic disturbances through circadian misalignment and sleep disruption. The present study investigated associations between residential…
View article: Light pollution and the concentration of anthropogenic photons in the terrestrial atmosphere
Light pollution and the concentration of anthropogenic photons in the terrestrial atmosphere Open
View article: Quantitative evaluation of outdoor artificial light emissions using low Earth orbit radiometers
Quantitative evaluation of outdoor artificial light emissions using low Earth orbit radiometers Open
Low Earth orbit radiometers allow monitoring nighttime anthropogenic light emissions in wide areas of the planet. In this work we describe a simple model for assessing significant outdoor lighting changes at the municipality level using on…
View article: Multiple Angle Observations Would Benefit Visible Band Remote Sensing Using Night Lights
Multiple Angle Observations Would Benefit Visible Band Remote Sensing Using Night Lights Open
The spatial and angular emission patterns of artificial and natural light emitted, scattered, and reflected from the Earth at night are far more complex than those for scattered and reflected solar radiation during daytime. In this comment…
View article: Nighttime Atmospheric Scattering Phase Function Derived From the Scattered Light of a Laser Beam
Nighttime Atmospheric Scattering Phase Function Derived From the Scattered Light of a Laser Beam Open
Continuous monitoring of the atmospheric scattering phase function is difficult to perform since most observational techniques are limited to daylight hours. Among known aerosol optical properties, only atmospheric optical depth is measure…
View article: An enhanced version of the Gaia map of the brightness of the natural sky
An enhanced version of the Gaia map of the brightness of the natural sky Open
The GAia Map of the Brightness Of the Natural Sky (GAMBONS) is a model to map the natural night brightness of the sky in cloudless and moonless nights. It computes the star radiance from the photometric data in Gaia and Hipparcos catalogue…
View article: Towards a global map of the artificial all-sky brightness
Towards a global map of the artificial all-sky brightness Open
Modeling the hemispherical night sky brightness of anthropogenic origin is a demanding computational challenge, due to the intensive calculations required to produce all-sky maps with fine angular resolution including high-order scattering…
View article: Estimating linear radiance indicators from the zenith night-sky brightness: on the Posch ratio for natural and light-polluted skies
Estimating linear radiance indicators from the zenith night-sky brightness: on the Posch ratio for natural and light-polluted skies Open
Estimating the horizontal irradiance from measurements of the zenith night-sky radiance is a useful operation for basic and applied studies in observatory site assessment, atmospheric optics, and environmental sciences. The ratio between t…
View article: Can we illuminate our cities and (still) see the stars?
Can we illuminate our cities and (still) see the stars? Open
Could we enjoy starry skies in our cities again? Arguably yes. The actual number of visible stars will depend, among other factors, on the spatial density of the overall city light emissions. In this paper it is shown that reasonably dark …
View article: RGB photometric calibration of 15 million <i>Gaia</i> stars
RGB photometric calibration of 15 million <i>Gaia</i> stars Open
Although a catalogue of synthetic RGB magnitudes, providing photometric data for a sample of 1346 bright stars, has been recently published, its usefulness is still limited due to the small number of reference stars available, considering …
View article: The benefit of multiple angle observations for visible band remote sensing using night lights
The benefit of multiple angle observations for visible band remote sensing using night lights Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Atmospheres. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…