| Records |
Author  |
Kumar, P.; Sajjad, H.; Joshi, P.K.; Elvidge, C.D.; Rehman, S.; Chaudhary, B.S.; Tripathy, B.R.; Singh, J.; Pipal, G. |
| Title |
Modeling the luminous intensity of Beijing, China using DMSP-OLS night-time lights series data for estimating population density |
Type |
Journal Article |
| Year |
2018 |
Publication |
Physics and Chemistry of the Earth, Parts A/B/C |
Abbreviated Journal |
Physics and Chemistry of the Earth, Parts A/B/C |
| Volume |
109 |
Issue |
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Pages |
31-39 |
| Keywords |
Remote Sensing |
| Abstract |
Various scientific researches were conducted to monitor human activities and natural phenomena with the availability of various night time satellite data such as Defense Meteorological Satellite Program (DMPS). Population growth especially in a faster growing economy like China is an important indicator for assessing socio-economic development, urban planning and environmental management. Thus, spatial distribution of population is instrumental in assessing growth and developmental activities in Beijing city of China. The satellite observation data derived from Defense Meteorological Satellite Program (DMSP) was utilized to estimate population density through the measurement of light flux with radiometric recording. The data was calibrated using C0, C1, C2 parameters before processing. Population density of Beijing city was estimated using light volume of this calibrated data. Regression analysis between urban population and light volume revealed high correlation (r2=0.89)r2=0.89). Thus, population density can effectively be estimated using light intensity. The model used for estimating urban population density can effectively be utilized for other major cities of the world. |
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| ISSN |
1474-7065 |
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GFZ @ kyba @ |
Serial |
1934 |
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| Author |
Kurvers, R.H.J.M.; Drägestein, J.; Hölker, F.; Jechow, A.; Krause, J.; Bierbach, D. |
| Title |
Artificial Light at Night Affects Emergence from a Refuge and Space Use in Guppies |
Type |
Journal Article |
| Year |
2018 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci Rep |
| Volume |
8 |
Issue |
1 |
Pages |
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| Keywords |
Animals |
| Abstract |
Artificial light at night (ALAN) is a major form of anthropogenic pollution. ALAN is well known to affect different behaviours during nighttime, when changes in light conditions often have immediate consequences for the trade-offs individuals experience. How ALAN affects daytime behaviours, however, has received far less attention. Here we studied how ALAN affected daytime personality traits and learning ability. We exposed Trinidadian guppies, Poecilia reticulata, for 10 weeks to different ALAN levels: bright light (24 hrs bright light, ~5,000 lx), dim light (12 hrs bright light; 12 hrs dim light, ~0.5 lx) and control (12 hrs bright light; 12 hrs dark). Afterwards, we tested how the treatments affected diurnal emergence from a refuge, space use, activity, sociability and the ability to memorize the location of companion fish. Individuals exposed to the light treatments (both dim and bright light) emerged quicker from a refuge and fish from the bright light treatment spent relatively more time in the open area of the arena. ALAN did not affect any of the other behaviours, although memory could not be tested since fish did not learn the companions’ location. Our results demonstrate that ALAN, next to affecting nocturnal behaviours, can also affect key diurnal behavioural processes, associated with risk-taking. |
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2045-2322 |
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GFZ @ kyba @ |
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2013 |
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Kwak, M.; Je, S.; Cheng, H.; Seo, S.; Park, J.; Baek, S.; Khaine, I.; Lee, T.; Jang, J.; Li, Y.; Kim, H.; Lee, J.; Kim, J.; Woo, S. |
| Title |
Night Light-Adaptation Strategies for Photosynthetic Apparatus in Yellow-Poplar (Liriodendron tulipifera L.) Exposed to Artificial Night Lighting |
Type |
Journal Article |
| Year |
2018 |
Publication |
Forests |
Abbreviated Journal |
Forests |
| Volume |
9 |
Issue |
2 |
Pages |
74 |
| Keywords |
Plants |
| Abstract |
Plants can undergo external fluctuations in the natural light and dark cycle. The photosynthetic apparatus needs to operate in an appropriate manner to fluctuating environmental factors, especially in light. Yellow-poplar seedlings were exposed to nighttime artificial high-pressure sodium (HPS) lighting to evaluate night light-adaptation strategies for photosynthetic apparatus fitness relative to pigment contents, photosystem II photochemistry, photosynthetic parameters, histochemical analysis of reactive oxygen species, and plant biomass. As a result, seedlings exhibited dynamic changes including the enhancement of accessory pigments, the reduction of photosystem II photochemistry, increased stomatal limitation, downregulation of photosynthesis, and the decreased aboveground and belowground biomass under artificial night lighting. Histochemical analysis with 3,3′-diaminobenzidine (DAB) and nitroblue tetrazolium (NBT) staining indicates the accumulation of in situ superoxide radicals (O2−) and hydrogen peroxide (H2O2) in leaves exposed to the lowest level of artificial night lighting compared to control. Moreover, these leaves exposed to artificial night lighting had a lower nighttime respiration rate. These results indicated that HPS lighting during the night may act as a major factor as repressors of the fitness of photosynthesis and growth patterns, via a modification of the photosynthetic light harvesting apparatus. |
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1999-4907 |
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LoNNe @ kyba @ |
Serial |
1809 |
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| Author |
Kyba, C.C.M. |
| Title |
Is light pollution getting better or worse? |
Type |
Journal Article |
| Year |
2018 |
Publication |
Nature Astronomy |
Abbreviated Journal |
Nat Astron |
| Volume |
2 |
Issue |
4 |
Pages |
267-269 |
| Keywords |
Skyglow; Commentary |
| Abstract |
Awareness of light pollution is spreading, but with changing lighting technologies, emissions are shifting to wavelengths our current measuring devices cannot assess well. Community involvement is essential to evaluate changes in sky brightness. |
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2397-3366 |
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no |
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GFZ @ kyba @ |
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1870 |
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Kyba, C.C.M.; Mohar, A.; Pintar, G; Stare, J |
| Title |
Reducing the environmental footprint of church lighting: matching façade shape and lowering luminance with the EcoSky LED |
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Journal Article |
| Year |
2018 |
Publication |
International Journal of Sustainable Lighting |
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20 |
Issue |
1 |
Pages |
1-10 |
| Keywords |
Energy; Lighting; Remote Sensing |
| Abstract |
The lighting of the Church of the Three Kings in Logatec, Slovenia was replaced in 2014. The power of the installation was reduced 96% from 1.6 kW to 58 W, and spill light from the site was effectively eliminated. As a result, the church is no longer visible in nighttime satellite images of the area, indicating a reduction of waste light from the site of at least a factor of 30. This article discusses the concept of sustainability with regards to cultural heritage lighting, within the context of this example. |
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no |
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GFZ @ kyba @ |
Serial |
1831 |
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