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Sci Rep. 2015 Feb 12;5:8409. doi: 10.1038/srep08409.

Worldwide variations in artificial skyglow.

Scientific reports

Christopher C M Kyba, Kai Pong Tong, Jonathan Bennie, Ignacio Birriel, Jennifer J Birriel, Andrew Cool, Arne Danielsen, Thomas W Davies, Peter N den Outer, William Edwards, Rainer Ehlert, Fabio Falchi, Jürgen Fischer, Andrea Giacomelli, Francesco Giubbilini, Marty Haaima, Claudia Hesse, Georg Heygster, Franz Hölker, Richard Inger, Linsey J Jensen, Helga U Kuechly, John Kuehn, Phil Langill, Dorien E Lolkema, Matthew Nagy, Miguel Nievas, Nobuaki Ochi, Emil Popow, Thomas Posch, Johannes Puschnig, Thomas Ruhtz, Wim Schmidt, Robert Schwarz, Axel Schwope, Henk Spoelstra, Anthony Tekatch, Mark Trueblood, Constance E Walker, Michael Weber, Douglas L Welch, Jaime Zamorano, Kevin J Gaston

Affiliations

  1. 1] Leibniz-Institute for Freshwater Ecology and Inland Fisheries [2] Institute for Space Sciences, Freie Universität Berlin, Berlin, Germany [3] Deutsches GeoForschungsZentrum Potsdam, Potsdam, Germany.
  2. Institut für Umweltphysik, Universität Bremen, Bremen, Germany.
  3. Environment and Sustainability Institute, University of Exeter, Penryn, UK.
  4. Morehead State University, Morehead, USA.
  5. The Heights Observatory, Adelaide.
  6. Unaffiliated Citizen Scientist.
  7. National Institute for Public Health and the Environment, Bilthoven, The Netherlands.
  8. Light Pollution Science and Technology Institute (ISTIL), Thiene, Italy.
  9. Institute for Space Sciences, Freie Universität Berlin, Berlin, Germany.
  10. Attivarti.org, Torniella, Italy.
  11. Landesamt für Umwelt, Gesundheit und Verbraucherschutz Brandenburg, Germany.
  12. Leibniz-Institute for Freshwater Ecology and Inland Fisheries.
  13. 1] National Optical Astronomy Observatory, Tucson, USA [2] Utah State University, Logan, USA.
  14. Rothney Astrophysical Observatory, University of Calgary, Calgary, Canada.
  15. Department of Physics, University of Alberta, Edmonton, Canada.
  16. Departamento de Astrofísica y Ciencias de la Atmósfera, Universidad Complutense de Madrid, Madrid, Spain.
  17. Faculty of Business Administration, Toyo University, Tokyo, Japan.
  18. Leibniz-Institut für Astrophysik Potsdam (AIP), Potsdam, Germany.
  19. Institut für Astrophysik, Vienna, Austria.
  20. Sotto le Stelle, Utrecht, The Netherlands.
  21. Lumineux Consult, Arnhem, The Netherlands.
  22. Unihedron, Grimsby, Canada.
  23. Winer Observatory, Sonoita, USA.
  24. National Optical Astronomy Observatory, Tucson, USA.
  25. Department of Physics and Astronomy, McMaster University, Hamilton, Canada.

PMID: 25673335 PMCID: PMC5389131 DOI: 10.1038/srep08409

Abstract

Despite constituting a widespread and significant environmental change, understanding of artificial nighttime skyglow is extremely limited. Until now, published monitoring studies have been local or regional in scope, and typically of short duration. In this first major international compilation of monitoring data we answer several key questions about skyglow properties. Skyglow is observed to vary over four orders of magnitude, a range hundreds of times larger than was the case before artificial light. Nearly all of the study sites were polluted by artificial light. A non-linear relationship is observed between the sky brightness on clear and overcast nights, with a change in behavior near the rural to urban landuse transition. Overcast skies ranged from a third darker to almost 18 times brighter than clear. Clear sky radiances estimated by the World Atlas of Artificial Night Sky Brightness were found to be overestimated by ~25%; our dataset will play an important role in the calibration and ground truthing of future skyglow models. Most of the brightly lit sites darkened as the night progressed, typically by ~5% per hour. The great variation in skyglow radiance observed from site-to-site and with changing meteorological conditions underlines the need for a long-term international monitoring program.

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