Comparison between experimental data and modeling estimates of aerosol optical depth over Athens, Greece
Φόρτωση...
Ημερομηνία
Συγγραφείς
Kaskaoutis, D. G.
Kambezidis, H. D.
Adamopoulos, A. D.
Kassomenos, P. A.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of Atmospheric and Solar-Terrestrial Physics
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Ground-based spectroradiometric measurements taken in the atmosphere of Athens during May 1995 have been used to investigate various atmospheric parameters. From the direct-beam irradiance measurements the spectral aerosol optical depths as well as the Angstrom parameters are derived using the least-squares method applied to measured spectral irradiance data. In this way the errors associated with the turbidity coefficient, beta, are found to be 0.0029 on average and with the wavelength exponent, alpha, 0.031. In this paper, a comparative study between the aerosol optical depth derived by the spectral direct-beam irradiance measurements and those estimated through the Angstrom's formula is made. The correlation coefficient between the measured and computed optical depth is higher than 0.93 in most cases, while their greatest differences take place at the shorter wavelengths. A further analysis of the above differences at 500 and 1000 nrn shows very low values, especially at 500 nm, indicating the accuracy of the fitting. The differences at 1000 mn are much higher due to uncertainties in the water-vapor optical depth determination. The errors in Angstrom parameters as well as in the Angstrom's formula fitting to the derived spectral aerosol optical depth depend strongly on atmospheric turbidity, reaching to higher values under low atmospheric turbidity conditions. (C) 2006 Elsevier Ltd. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
spectral aerosol optical depth, angstrom formula, athens, greece, spectral atmospheric transmittance, angstrom turbidity parameters, multispectral measurements, wavelength dependence, radiative-transfer, size distribution, visible regions, beam irradiance, ultraviolet, formula
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000239295300002
http://ac.els-cdn.com/S1364682606000654/1-s2.0-S1364682606000654-main.pdf?_tid=63e45806c31be18af0e7cb7d16384723&acdnat=1334227893_c1cd662ec46ef744dddfeb3fd307436a
http://ac.els-cdn.com/S1364682606000654/1-s2.0-S1364682606000654-main.pdf?_tid=63e45806c31be18af0e7cb7d16384723&acdnat=1334227893_c1cd662ec46ef744dddfeb3fd307436a
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών