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dc.contributor.author
Luccini, Eduardo Alfredo
dc.contributor.author
Rivas, Miguel
dc.contributor.author
Rojas, Elisa
dc.date.available
2018-09-03T20:22:59Z
dc.date.issued
2016-06-23
dc.identifier.citation
Luccini, Eduardo Alfredo; Rivas, Miguel; Rojas, Elisa; Cloud optical depth from total and UV solar irradiance measurements at two sites of the Atacama Desert in Chile; Elsevier Science Inc; Atmospheric Research; 174-175; 23-6-2016; 18-30
dc.identifier.issn
0169-8095
dc.identifier.uri
http://hdl.handle.net/11336/58126
dc.description.abstract
The visible cloud optical depth (COD) for overcast stratocumulus was estimated at Arica (18.47°S, 70.31°W, 20 m above sea level (asl)) and Poconchile (18.45°S, 70.07°W, 560 m asl), northernmost Chilean sites distant about 30 km in the Atacama Desert, during morning hours for days in which cloudiness dissipates giving cloudless afternoons, from 10 min averaged measurements of total shortwave solar irradiance (ToSI) and ultraviolet solar irradiance (UVSI) during the period 2002-2005. One-dimensional radiative transfer model calculations were made to establish a theoretical relationship between the visible COD, the cloud effective transmittance in both ToSI (CETTo) and UVSI (CETUV), and the solar zenith angle (SZA). It is used to estimate COD from the previously measured CET by Luccini et al. (2011). Measurements in both ToSI and UVSI broadband ranges showed to be reliable to determine the visible COD within this frame. Overcast COD at the coastal site of Arica (typical COD ~15) is slightly larger than at the inland site of Poconchile (typical COD ~11). Maximum sensitivity of the retrieved CODs was found to variations in the cloud droplet effective radius, surface albedo and aerosol optical depth in both ranges, and in the total ozone column additionally in UVSI. The obtained CODs are linearly related but are higher compared with those from two other parametric methods using the same data. A simple rational expression of CET as a function of COD enables to estimate a mean (spectral and regional) surface albedo in each range that is in turn applicable to fit appropriately the ratio CETTo/CETUV. Instantaneous overpass MODIS-Terra satellite COD at 660 nm show a good agreement with simultaneous (within ±5 min) ground-derived COD at both sites.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science Inc
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Atacama
dc.subject
Cloud Optical Depth
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Shortwave
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Solar Irradiance
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Southeast Pacific
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Uv
dc.subject.classification
Meteorología y Ciencias Atmosféricas
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Cloud optical depth from total and UV solar irradiance measurements at two sites of the Atacama Desert in Chile
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-07-17T13:55:14Z
dc.journal.volume
174-175
dc.journal.pagination
18-30
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Luccini, Eduardo Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Provincia de Córdoba. Ministerio de Ciencia y Técnica. Centro de Excelencia en Productos y Procesos de Córdoba; Argentina. Pontificia Universidad Católica Argentina "Santa María de los Buenos Aires"; Argentina
dc.description.fil
Fil: Rivas, Miguel. Universidad de Tarapacá; Chile
dc.description.fil
Fil: Rojas, Elisa. Universidad de Tarapacá; Chile
dc.journal.title
Atmospheric Research
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.atmosres.2016.01.007
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169809516000284
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