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| Titel |
Multi-year investigations of aerosols from an island station, Port Blair, in the Bay of Bengal: climatology and source impacts |
| VerfasserIn |
S. Naseema Beegum, K. Krishna Moorthy, Mukunda M. Gogoi, S. Suresh Babu, S. K. Pandey |
| 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. 8 ; Nr. 30, no. 8 (2012-08-08), S.1113-1127 |
| Datensatznummer |
250017249
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| Publikation (Nr.) |
 copernicus.org/angeo-30-1113-2012.pdf |
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| Zusammenfassung |
| Long-term measurements of spectral aerosol optical depth (AOD) using
multi-wavelength solar radiometer (MWR) for a period of seven years (from
2002 to 2008) from the island location, Port Blair (11.63° N, 92.7° E,
PBR) in the Bay of Bengal (BoB), along with the concurrent measurements of
the size distribution of near-surface aerosols, have been analyzed to
delineate the climatological features of aerosols over eastern BoB. In order
to identity the contribution of different aerosol types from distinct
sources, concentration weighted trajectory (CWT) analysis has been employed.
Climatologically, AODs increase from January to reach peak value of ~0.4
(at 500 nm) in March, followed by a weak decrease towards May. Over
this general pattern, significant modulations of intra-seasonal time scales,
caused by the changes in the relative strength of distinctively different
sources, are noticed. The derivative (α') of the Angstrom wavelength exponent
α in the wavelength domain, along with CWT analysis, are used to
delineate the different important aerosol types that influence this remote
island. Corresponding changes in the aerosol size distributions are inferred
from the numerical inversion of the spectral AODs as well from (surface)
measurements. The analyses revealed that advection plays a major role in
modifying the aerosol properties over the remote island location, the
potential sources contributing to the accumulation mode (coarse mode)
aerosols over eastern BoB being the East Asia and South China regions
(Indian mainland and the oceanic regions). |
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