On the characterization of aerosols using the Angstrom exponent in the Athens area
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 were taken in the atmosphere of Athens during May 1995 in order to investigate various atmospheric conditions. This study focuses on the Angstrom exponent alpha, which is the slope of the logarithm of the aerosol optical depth (AOD) versus the logarithm of the wavelength, In lambda, and is commonly used to characterize the wavelength dependence of AOD and to provide some basic information on the aerosol size distribution. Using the Volz method, Angstrom exponent values, alpha, were derived in five narrow spectral bands, 340-380, 380-440, 440-500, 500-670 and 670-870 nm. Also using both Volz and least-squares fit methods alpha values were derived for the whole spectrum 340-870 nm.The results show that alpha depends strongly on the wavelength interval used due to the curvature of the lnAOD versus In lambda line. Using the spectral dependence of the Angstrom exponent and the relationship between alpha computed in different spectral bands with AOD, an attempt to investigate on the aerosol types is made. The results obtained are rather contradictory and the determination of a dominant aerosol type in the Athens area is not clear. Nevertheless, in the most cases the anthropogenic aerosols seem to be the dominant type with rather significant contributions of coarse-mode particles due to particle growing or due to mixing processes with other aerosol types. (C) 2006 Elsevier Ltd. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
aerosol optical depth, angstrom exponent, wavelength dependence, athens, greece, spectral atmospheric transmittance, optical-properties, radiative-transfer, saharan dust, raman lidar, spectroradiometer measurements, multispectral measurements, wavelength dependence, size distribution, visible regions
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000243140900010
http://ac.els-cdn.com/S1364682606001891/1-s2.0-S1364682606001891-main.pdf?_tid=60f05e75cb7670176c17050055ee3196&acdnat=1334227883_b9308332e372984dae584a1c2d9d7c6e
http://ac.els-cdn.com/S1364682606001891/1-s2.0-S1364682606001891-main.pdf?_tid=60f05e75cb7670176c17050055ee3196&acdnat=1334227883_b9308332e372984dae584a1c2d9d7c6e
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