Spectral curves of surface reflectance in some Antarctic regions (Articolo in rivista)

Type
Label
  • Spectral curves of surface reflectance in some Antarctic regions (Articolo in rivista) (literal)
Anno
  • 2001-01-01T00:00:00+01:00 (literal)
Alternative label
  • Lupi A., Tomasi C., Orsini A., Cacciari A., Vitale V., Georgiadis T., Casacchia R., Salvatori R., and Salvi S (2001)
    Spectral curves of surface reflectance in some Antarctic regions
    in Il Nuovo cimento della Società italiana di fisica. C. Geophysics and space physics (Testo stamp.)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Lupi A., Tomasi C., Orsini A., Cacciari A., Vitale V., Georgiadis T., Casacchia R., Salvatori R., and Salvi S (literal)
Pagina inizio
  • 313 (literal)
Pagina fine
  • 327 (literal)
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  • 24C (literal)
Rivista
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  • 15 (literal)
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  • pubblicazione scientifica (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • ISAO-CNR, ISAO-CNR, ISAO-CNR, ISAO-CNR, ISAO-CNR, ISAO-CNR, IIA-CNR, IIA-CNR, IIA-CNR (literal)
Titolo
  • Spectral curves of surface reflectance in some Antarctic regions (literal)
Abstract
  • Four surface reflectance models of solar radiation were determined by examining several sets of field measurements taken for clear-sky conditions at various sites in Antarctica. Each model consists of mean spectral curves of surface reflectance in the 0.25-2.7 µm wavelength range and of the dependence curve of total albedo on the solar elevation angle h within the range from 5-55 degree. The TNB (Terra Nova Bay) model refers to a rocky terrain where granites are predominant; the NIS (Nansen Ice Sheet) model to a flakier surface made uneven by sastrugi and streaked by irregular fractures; the HAP (High Altitude Plateau) model to a flat ice surface covered by fresh snow and scored by light sastrugi; and the RIS (Ross Ice Shelf) model to an area covered by the sea-ice pack presenting many discontinuities in the reflectance features, due to melt water lakes, puddles, re-frozen ice and snow pots. The reflectance curve obtained from the TNB presents gradually increasing values as wavelength increases through the visible spectral range and almost costant values at infrared wavelengths, giving a total albedo value equal to 0.64 at h = 30°, which increases by about 80% through the lower range of h and decreases by 12% through the upper range. The reflectance curves of the NIS, HAP, and RIS models are all peaked at visible wavelength and exhibit decreasing values throughout the infrared spectral range, giving values of total albedo equal to 0.464, 0.738 and 0.426 at h = 30°, respectively. These values were estimated to increase by 8-14 % as h decreases from 30° to 5° and to decrease by 2-4 % only as h increases from 30° to 55°. (literal)
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