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Worldwide variations in artificial skyglow.

Christopher C M Kyba1, Kai Pong Tong2, Jonathan Bennie3

  • 11] Leibniz-Institute for Freshwater Ecology and Inland Fisheries [2] Institute for Space Sciences, Freie Universität Berlin, Berlin, Germany [3] Deutsches GeoForschungsZentrum Potsdam, Potsdam, Germany.

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This summary is machine-generated.

Artificial nighttime skyglow varies widely, impacting nearly all monitored sites. This study highlights the need for long-term international monitoring of light pollution effects.

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Area of Science:

  • Environmental Science
  • Astronomy
  • Atmospheric Science

Background:

  • Artificial nighttime skyglow is a significant environmental change with limited understanding.
  • Previous skyglow studies were local, regional, and short-term.

Purpose of the Study:

  • To compile international monitoring data to understand skyglow properties.
  • To address key questions regarding the variability and characteristics of artificial light at night.

Main Methods:

  • International compilation of long-term skyglow monitoring data.
  • Analysis of sky brightness variations across different sites and meteorological conditions.

Main Results:

  • Observed skyglow variations spanning four orders of magnitude, far exceeding pre-artificial light levels.
  • Nearly all study sites exhibited artificial light pollution.
  • A non-linear relationship between clear and overcast night sky brightness was found, with overcast skies ranging from 0.33x to 18x brighter than clear skies.
  • Clear sky radiance estimates were overestimated by approximately 25% compared to this dataset.
  • Most brightly lit sites showed a darkening trend of about 5% per hour as the night progressed.

Conclusions:

  • The significant site-to-site and meteorological variations in skyglow emphasize the necessity of a sustained international monitoring program.
  • This dataset is crucial for calibrating and validating future skyglow models.
  • Further research is needed to fully comprehend the widespread impacts of artificial light at night.