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Author Wu, J.; He, S.; Peng, J.; Li, W.; Zhong, X.
Title Intercalibration of DMSP-OLS night-time light data by the invariant region method Type Journal Article
Year 2013 Publication International Journal of Remote Sensing Abbreviated Journal International Journal of Remote Sensing
Volume 34 Issue 20 Pages 7356-7368
Keywords (up) DMSP-OLS; remote sensing; light at night
Abstract DMSP-OLS (Defense Meteorological Satellite Program Operational Linescan System) night-time light data can accurately reflect the scope and intensity of human activities. However, the raw data cannot be used directly for temporal analyses due to the lack of inflight calibration. There are three problems that should be addressed in intercalibration. First, because of differences between sensors, the data are not identical even when obtained in the same year. Second, different acquisition times may lead to random or systematic fluctuations in the data obtained by satellites in different orbits. Third, a pixel saturation phenomenon also exists in the urban centres of the image. Therefore, an invariant region method was used in this article, and the relative radiometric calibration and saturation correction achieved the desired results. In the meantime, intercalibration models for each satellite year of DMSP-OLS night-time light data were produced. Finally, intercalibration accuracy was evaluated, and the intercalibration results were tested with the corresponding gross domestic product (GDP) data.
Address School of Urban Planning and Design , Peking University , Shenzhen , 518055 , China
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ISSN 0143-1161 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 203
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Author Meyer, L.A.; Sullivan, S.M.P.
Title Bright lights, big city: influences of ecological light pollution on reciprocal stream-riparian invertebrate fluxes Type Journal Article
Year 2013 Publication Ecological Applications Abbreviated Journal Ecological Applications
Volume 23 Issue 6 Pages 1322-1330
Keywords (up) ecological light pollution; ecosystem function; stream–riparian invertebrate fluxes; tetragnathid spiders; urban streams
Abstract Cities produce considerable ecological light pollution (ELP), yet the effects of artificial night lighting on biological communities and ecosystem function have not been fully explored. From June 2010 to June 2011, we surveyed aquatic emergent insects, riparian arthropods entering the water, and riparian spiders of the family Tetragnathidae at nine stream reaches representing common ambient ELP levels of Columbus, Ohio, USA, streams (low, 0.1–0.5 lux; moderate, 0.6–2.0 lux; high, 2.1–4.0 lux). In August 2011, we experimentally increased light levels at the low- and moderate-treatment reaches to 10–12 lux to represent urban streams exposed to extremely high levels of ELP. Although season exerted the dominant influence on invertebrate fluxes over the course of the year, when analyzed by season, we found that light strongly influenced multiple invertebrate responses. The experimental light addition resulted in a 44% decrease in tetragnathid spider density (P = 0.035), decreases of 16% in family richness (P = 0.040) and 76% in mean body size (P = 0.022) of aquatic emergent insects, and a 309% increase in mean body size of terrestrial arthropods (P = 0.015). Our results provide evidence that artificial light sources can alter community structure and ecosystem function in streams via changes in reciprocal aquatic–terrestrial fluxes of invertebrates.
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Series Volume Series Issue Edition
ISSN 1051-0761 ISBN Medium
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Notes Approved no
Call Number IDA @ john @ Serial 102
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Author Posch, T.; Hölker, F.; Freyhoff, A.; Uhlmann, T.
Title (Hrsg.): Das Ende der Nacht. Lichtsmog: Gefahren – Perspektiven – Lösungen. 2. Auflage, Wiley-VCH Verlag 2013 Type Journal Article
Year 2013 Publication Abbreviated Journal
Volume Issue Pages 231
Keywords (up) Ecology
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Notes Approved no
Call Number LoNNe @ kagoburian @ Serial 679
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Author Held, M.; Hölker, F.; Jessel, B.
Title Schutz der Nacht – Lichtverschmutzung, Biodiversität und Nachtlandschaft. Type Book Whole
Year 2013 Publication BfN-Skripten Abbreviated Journal
Volume 336 Issue Pages
Keywords (up) Ecology
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Notes Approved no
Call Number LoNNe @ kagoburian @ Serial 681
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Author Clark, G.F.; Stark, J.S.; Johnston, E.L.; Runcie, J.W.; Goldsworthy, P.M.; Raymond, B.; Riddle, M.J.
Title Light-driven tipping points in polar ecosystems Type Journal Article
Year 2013 Publication Global Change Biology Abbreviated Journal Glob Chang Biol
Volume 19 Issue 12 Pages 3749-3761
Keywords (up) Ecology; benthic; biodiversity; irradiance; macroalgae; marine ecology; polar; regime shift
Abstract Some ecosystems can undergo abrupt transformation in response to relatively small environmental change. Identifying imminent 'tipping points' is crucial for biodiversity conservation, particularly in the face of climate change. Here, we describe a tipping point mechanism likely to induce widespread regime shifts in polar ecosystems. Seasonal snow and ice-cover periodically block sunlight reaching polar ecosystems, but the effect of this on annual light depends critically on the timing of cover within the annual solar cycle. At high latitudes, sunlight is strongly seasonal, and ice-free days around the summer solstice receive orders of magnitude more light than those in winter. Early melt that brings the date of ice-loss closer to midsummer will cause an exponential increase in the amount of sunlight reaching some ecosystems per year. This is likely to drive ecological tipping points in which primary producers (plants and algae) flourish and out-compete dark-adapted communities. We demonstrate this principle on Antarctic shallow seabed ecosystems, which our data suggest are sensitive to small changes in the timing of sea-ice loss. Algae respond to light thresholds that are easily exceeded by a slight reduction in sea-ice duration. Earlier sea-ice loss is likely to cause extensive regime shifts in which endemic shallow-water invertebrate communities are replaced by algae, reducing coastal biodiversity and fundamentally changing ecosystem functioning. Modeling shows that recent changes in ice and snow cover have already transformed annual light budgets in large areas of the Arctic and Antarctic, and both aquatic and terrestrial ecosystems are likely to experience further significant change in light. The interaction between ice-loss and solar irradiance renders polar ecosystems acutely vulnerable to abrupt ecosystem change, as light-driven tipping points are readily breached by relatively slight shifts in the timing of snow and ice-loss.
Address School of Biological, Earth and Environmental Science, University of New South Wales, Sydney, NSW, 2052, Australia
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Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1354-1013 ISBN Medium
Area Expedition Conference
Notes PMID:23893603 Approved no
Call Number LoNNe @ kagoburian @ Serial 850
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