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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 8
Ann. Geophys., 22, 3073-3077, 2004
https://doi.org/10.5194/angeo-22-3073-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 3073-3077, 2004
https://doi.org/10.5194/angeo-22-3073-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  07 Sep 2004

07 Sep 2004

Large aerosol optical depths observed at an urban location in southern India associated with rain-deficit summer monsoon season

V. Vinoj1, S. K. Satheesh1, S. Suresh Babu2, and K. Krishna Moorthy2 V. Vinoj et al.
  • 1Centre for Atmospheric and Oceanic Sciences Indian Institute of Science, Bangalore-560 012, India
  • 2Space Physics Laboratory Vikram Sarabhai Space Centre, Trivandrum-695 022, India

Abstract. 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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