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| Titel |
Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniques |
| VerfasserIn |
P. R. Sinha, D. G. Kaskaoutis, R. K. Manchanda, S. Sreenivasan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 30, no. 9 ; Nr. 30, no. 9 (2012-09-27), S.1393-1410 |
| Datensatznummer |
250017271
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| Publikation (Nr.) |
 copernicus.org/angeo-30-1393-2012.pdf |
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| Zusammenfassung |
| The present study focuses on analyzing the seasonal changes in aerosol
characteristics using a classification scheme proposed by Gobbi et al.
(2007). This scheme is based on the correlation between the Ångström
exponent (α) in the 440–870 nm range and the difference in α
values [dα = α (440–675 − α(675–870)] including
the size of fine-mode particles (Rf) and the fine-mode fraction (η). The classification scheme can therefore provide
information on the aerosol characteristics and their modification in
transit. Spectral aerosol measurements using the Microtops-II sun photometer
(MT-II) have systematically been conducted in Hyderabad, India during April
2009–March 2010 and analysed to study the seasonal effects. The results
reveal a seasonal dependence, i.e. the presence of fine-mode aerosols under
turbid atmospheres in winter and post-monsoon, a mixture of fine and coarse
aerosol types in pre-monsoon and a significant influence of marine mixed
with dust air masses during the monsoon season. The identification of the
aerosol source type and the modification processes are discussed along with
clustered air-mass trajectory analysis. Furthermore, we have also checked
the consistency of this scheme with the findings arrived from the columnar
size distributions (CSDs) computed by numerical inversion of spectral AOD
using King's inversion algorithm and the scatter plot between AOD and
spectral α. The comparison clearly demonstrates the usefulness of
the classification scheme and highlights its advantages for the monitoring
and study of seasonal variation of the aerosol types and the modification
processes in the atmosphere. |
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