Large aerosol optical depths observed at an urban location in southern India associated with rain-deficit summer monsoon season
Aerosol spectral optical depth (AOD) measurements were made covering three years (2001, 2002 and 2003) at an urban continental location, Bangalore (13°N, 77.6°E) in India. These ground-based observations have shown that AODs reach a maximum during April (~0.5 at 500nm) and minimu...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2004-09-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/22/3073/2004/angeo-22-3073-2004.pdf |
| Summary: | Aerosol spectral optical depth (AOD) measurements were made
covering three years (2001, 2002 and 2003) at an urban continental location,
Bangalore (13°N, 77.6°E) in India. These ground-based observations
have shown that AODs reach a maximum during April (~0.5 at 500nm) and
minimum during the November to January period (~0.2). The Angstrom
wavelength exponent (α) was ~1.1 during the dry season
(December to April), which, in conjunction with the high optical depth
indicates significant anthropogenic influence. Seasonal variations in AODs
appear to have an association with monsoon rainfall. Large AODs (α~1.4)
were observed during the rain-deficit summer monsoon season (SMS) of 2002,
which persisted for more than six months. Enhancement in AODs during SMS
2002 was ~0.15 (at 500nm), compared to 2001 and 2003. |
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| ISSN: | 0992-7689 1432-0576 |