Título:
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Climatology of the aerosol extinction to backscatter ratio from sun photometric measurements
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Autor/a:
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Baldasano Recio, José María; Pedrós, Roberto; Estallés, Víctor; Sicard, Michaël; Gómez Amo, Jose Luis; Utrillas, Maria Pilar; Martínez Lozano, José Antonio; Rocadenbosch Burillo, Francisco; Pérez, C.
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Projectes d'Enginyeria; Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció; Universitat Politècnica de Catalunya. MTA - Modelització i Tecnologia Ambiental |
Abstract:
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The elastic lidar equation contains two unknown
atmospheric parameters, namely, the particulate optical extinction
and backscatter coefficients, which are related through the
lidar ratio (i.e., the particulate-extinction-to-backscatter ratio).
So far, independent inversion of the lidar signal has been carried
out by means of Raman lidars (usually limited to nighttime
measurements), high-spectral-resolution lidars, or scanning
elastic lidars under the assumption of a homogeneously vertically
stratified atmosphere. In this paper, we present a procedure
to obtain the lidar ratio at 532 nm by a combined Sunphotometer–
aerosol-model inversion, where the viability of the
solution is largely reinforced by assimilating categorized air-mass
back-trajectory information. Thus, iterative lidar-ratio tuning to
reconstruct the Sun-photometric aerosol optical depth (AOD)
is additionally constrained by the air-mass back trajectories
provided by the hybrid single-particle Lagrangian integratedtrajectory
model. The retrieved lidar ratios are validated with
inversions of lidar data based on the Klett–Fernald–Sasano algorithm
and with the Aerosol Robotic Network (AERONET)-
retrieved lidar ratios. The estimated lidar ratios concur with the
AERONET-retrieved lidar ratios and with those of the well-known
KFS inversion constrained with Sun-photometric AOD values and
embedded single-scattering models. The proposed method can be
applied to routinely extract climatological values of the lidar ratio
using measurements of direct solar irradiance (more numerous
than those of sky radiance). |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació -Aerosols -Sun-Photometric -Optical radar -Signal theory (Telecommunication) -Aerosols -back trajectories -extinction-tobackscatter -Sun photometer. -Senyal, Teoria del (Telecomunicació) |
Derechos:
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Tipo de documento:
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Artículo - Versión publicada Artículo |
Editor:
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IEEE Press. Institute of Electrical and Electronics Engineers
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