| Records |
| Author |
Boscarino, B.T.; Rudstam, L.G.; Eillenberger, J.L.; O'Gorman, R. |
| Title |
Importance of light, temperature, zooplankton and fish in predicting the nighttime vertical distribution of Mysis diluviana |
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Journal Article |
| Year |
2009 |
Publication |
Aquat Biol |
Abbreviated Journal |
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| Volume |
5 |
Issue |
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Pages |
263-279 |
| Keywords |
Animals; Mysis relicta; Modeling; Migration; Zooplankton; Vertical distribution; DVM |
| Abstract |
The opossum shrimp Mysis diluviana (formerly M. relicta) performs large amplitude diel vertical migrations in Lake Ontario and its nighttime distribution is influenced by temperature, light and the distribution of its predators and prey. At one location in southeastern Lake Ontario, we measured the vertical distribution of mysids, mysid predators (i.e. planktivorous fishes) and mysid prey (i.e. zooplankton), in addition to light and temperature, on 8 occasions from May to September, 2004 and 2005. We use these data to test 3 different predictive models of mysid habitat selection, based on: (1) laboratory-derived responses of mysids to different light and temperature gradients in the absence of predator or prey cues; (2) growth rate of mysids, as estimated with a mysid bioenergetics model, given known prey densities and temperatures at different depths in the water column; (3) ratio of growth rates (g) and mortality risk (μ) associated with the distribution of predatory fishes. The model based on light and temperature preferences was a better predictor of mysid vertical distribution than the models based on growth rate and g:μ on all 8 occasions. Although mysid temperature and light preferences probably evolved as mechanisms to reduce predation while increasing foraging intake, the response to temperature and light alone predicts mysid vertical distribution across seasons in Lake Ontario. |
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LoNNe @ christopher.kyba @ |
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402 |
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| Author |
Bará, S.; Nievas, M.; Sanchez de Miguel, A.; Zamorano, J. |
| Title |
Zernike analysis of all-sky night brightness maps |
Type |
Journal Article |
| Year |
2014 |
Publication |
Applied Optics |
Abbreviated Journal |
Appl Opt |
| Volume |
53 |
Issue |
12 |
Pages |
2677-2686 |
| Keywords |
modeling; light at night; light pollution; all-sky; Zernike polynomials; image decomposition; sky brightness |
| Abstract |
All-sky night brightness maps (calibrated images of the night sky with hemispherical field-of-view (FOV) taken at standard photometric bands) provide useful data to assess the light pollution levels at any ground site. We show that these maps can be efficiently described and analyzed using Zernike circle polynomials. The relevant image information can be compressed into a low-dimensional coefficients vector, giving an analytical expression for the sky brightness and alleviating the effects of noise. Moreover, the Zernike expansions allow us to quantify in a straightforward way the average and zenithal sky brightness and its variation across the FOV, providing a convenient framework to study the time course of these magnitudes. We apply this framework to analyze the results of a one-year campaign of night sky brightness measurements made at the UCM observatory in Madrid. |
| Address |
Ãrea de Óptica, Dept. de FÃsica Aplicada, Fac. de FÃsica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain |
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Optical Society of America |
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English |
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0003-6935 |
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PMID:24787595 |
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IDA @ john @ |
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318 |
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Solano Lamphar, H.A.; Kocifaj, M. |
| Title |
Urban night-sky luminance due to different cloud types: A numerical experiment |
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Journal Article |
| Year |
2015 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Res. & Tech. |
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48 |
Issue |
8 |
Pages |
1017-1033 |
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Skyglow; modeling; urban; clouds; radiative transfer |
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In this paper, we analyse theoretically and numerically the sky glow in urban and suburban areas, focusing on the zenith-normalised luminance of a cloudy sky. The results suggest that the altitude of a cloud imposes important changes in the luminance distribution. Peak values of sky luminance can be observed at a distance d = R + h tan (z), where R is the city radius, and h is the cloud altitude. Fluctuations of the zenith-normalised luminance over the city are dictated by three effects, specifically (i) extinction and backscatter in the undercloud atmosphere, (ii) the cloud properties and (iii) the radiant intensity function of the dominant ground-based light sources. For high clouds, the aerosol optical property is evident at moderate elevation angles. The light beams emitted from different parts of the city propagate along different inclined trajectories before they contribute to the elevated zenith luminance of low clouds. Then, multiple factors combine together to form the light field at the ground, city-size and city emission pattern being of specific importance. |
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Cátedras CONACYT, Instituto de investigaciones Dr José María Luis Mora, Programa Interdisciplinario de Estudios Metropolitanos (CentroMet), Plaza Valentín Gómez Farías #12 Col. San Juan Mixcoac, México D.F. C.P 03730. E-mail: lamphar(at)gmail.com |
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SAGE |
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English |
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English |
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1477-0938 |
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IDA @ john @ |
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1225 |
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| Author |
Nievas Rosillo, M. |
| Title |
Absolute photometry and Night Sky Brightness with all-sky cameras |
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Report |
| Year |
2013 |
Publication |
e-prints Complutense |
Abbreviated Journal |
e-prints Complutense |
| Volume |
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Issue |
24626 |
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Instrumentation; skyglow; measurement; modeling |
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All-sky cameras have proven to be powerful tools to continuously monitoring the sky in a wide range of fields in both Astrophysics and Meteorology. In this work, we have developed a complete software pipeline to analyze the night CCD images obtained with one of such systems. This let us to study typical parameters used in Astrophysics to characterize the night sky quality, such as the Sky Brightness, the Cloud Coverage and the Atmospheric Extinction, how they evolve over the time and their variability. Using our software, we analyzed a large set of data from AstMon-OT all-sky camera at Teide Observatory. Results from this work have been applied in the support to the spanish CTA site proposal at Izaña, Tenerife and are being discussed within the CTA consortium. A comparison with data from other devices that have been used in site characterization such as the IAC80 telescope is also presented. This comparison is used to validate the results of the analysis of all-sky images. Finally, we test our software with AstMon-UCM and DSLR cameras. Some general recommendations for the use of DSLR cameras are provided. |
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Departamento de Astrofísica y Ciencias de la Atmosfera, Universidad Complutense de Madrid, Madrid, Spain |
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Master's thesis |
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Madrid |
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English |
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English |
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e-prints Complutense |
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IDA @ john @ |
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1437 |
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Weishampel, Z.A.; Cheng, W.-H.; Weishampel, J.F. |
| Title |
Sea turtle nesting patterns in Florida vis-Ã -vis satellite-derived measures of artificial lighting |
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Journal Article |
| Year |
2016 |
Publication |
Remote Sensing in Ecology and Conservation |
Abbreviated Journal |
Remote Sens Ecol Conserv |
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2 |
Issue |
1 |
Pages |
59-72 |
| Keywords |
Animals; sea turtles; Artificial light; DMSP; light pollution; marine turtles; nest surveys; simultaneous autoregressive modeling; Florida; United States; Loggerhead turtle; Caretta caretta; Leatherback turtle; Dermochelys coriacea; Green turtle; Chelonia mydas |
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Light pollution contributes to the degradation and reduction of habitat for wildlife. Nocturnally nesting and hatching sea turtle species are particularly sensitive to artificial light near nesting beaches. At local scales (0.01–0.1 km), artificial light has been experimentally shown to deter nesting females and disorient hatchlings. This study used satellite-based remote sensing to assess broad scale (~1–100s km) effects of artificial light on nesting patterns of loggerhead (Caretta caretta), leatherback (Dermochelys coriacea) and green turtles (Chelonia mydas) along the Florida coastline. Annual artificial nightlight data from 1992 to 2012 acquired by the Defense Meteorological Satellite Program (DMSP) were compared to an extensive nesting dataset for 368, ~1 km beach segments from this same 21-year period. Relationships between nest densities and artificial lighting were derived using simultaneous autoregressive models to adjust for the presence of spatial autocorrelation. Though coastal urbanization increased in Florida during this period, nearly two-thirds of the surveyed beaches exhibited decreasing light levels (N = 249); only a small fraction of the beaches showed significant increases (N = 52). Nest densities for all three sea turtle species were negatively influenced by artificial light at neighborhood scales (<100 km); however, only loggerhead and green turtle nest densities were influenced by artificial light levels at the individual beach scale (~1 km). Satellite monitoring shows promise for light management of extensive or remote areas. As the spectral, spatial, and temporal resolutions of the satellite data are coarse, ground measurements are suggested to confirm that artificial light levels on beaches during the nesting season correspond to the annual nightlight measures. |
| Address |
Department of Biology, University of Central Florida, Orlando, FL 32816 USA; John.Weishampel(at)ucf.edu |
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Wiley |
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English |
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English |
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2056-3485 |
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IDA @ john @ |
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1346 |
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